Mercurial > hg > nginx-site
annotate xml/en/docs/dev/development_guide.xml @ 2141:10751277a8ad
nginx-1.13.12
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 10 Apr 2018 17:16:38 +0300 |
parents | f29bd40e9a62 |
children | c07cd947402f |
rev | line source |
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1899 | 1 <?xml version="1.0"?> |
2 | |
3 <!-- | |
4 Copyright (C) Nginx, Inc. | |
5 --> | |
6 | |
7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> | |
8 | |
9 <article name="Development guide" | |
10 link="/en/docs/dev/development_guide.html" | |
11 lang="en" | |
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12 rev="2"> |
1899 | 13 |
14 <section name="Introduction" id="introduction"> | |
15 | |
16 | |
17 <section name="Code layout" id="code_layout"> | |
18 | |
19 <list type="bullet"> | |
20 <listitem> | |
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21 <literal>auto</literal> — Build scripts |
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22 </listitem> |
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23 |
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24 <listitem> |
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25 <literal>src</literal> |
1899 | 26 |
27 <list type="bullet"> | |
28 | |
29 <listitem> | |
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30 <literal>core</literal> — Basic types and functions — string, array, log, |
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31 pool, etc. |
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32 </listitem> |
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33 |
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34 <listitem> |
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35 <literal>event</literal> — Event core |
1899 | 36 |
37 <list type="bullet"> | |
38 | |
39 <listitem> | |
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40 <literal>modules</literal> — Event notification modules: |
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41 <literal>epoll</literal>, <literal>kqueue</literal>, <literal>select</literal> |
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42 etc. |
1899 | 43 </listitem> |
44 | |
45 </list> | |
46 | |
47 </listitem> | |
48 | |
49 <listitem> | |
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50 <literal>http</literal> — Core HTTP module and common code |
1899 | 51 |
52 <list type="bullet"> | |
53 | |
54 <listitem> | |
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55 <literal>modules</literal> — Other HTTP modules |
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56 </listitem> |
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57 |
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58 <listitem> |
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59 <literal>v2</literal> — HTTP/2 |
1899 | 60 </listitem> |
61 | |
62 </list> | |
63 | |
64 </listitem> | |
65 | |
66 <listitem> | |
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67 <literal>mail</literal> — Mail modules |
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68 </listitem> |
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69 |
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70 <listitem> |
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71 <literal>os</literal> — Platform-specific code |
1899 | 72 |
73 <list type="bullet"> | |
74 | |
75 <listitem> | |
76 <literal>unix</literal> | |
77 </listitem> | |
78 | |
79 <listitem> | |
80 <literal>win32</literal> | |
81 </listitem> | |
82 | |
83 </list> | |
84 | |
85 </listitem> | |
86 | |
87 <listitem> | |
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88 <literal>stream</literal> — Stream modules |
1899 | 89 </listitem> |
90 | |
91 </list> | |
92 | |
93 </listitem> | |
94 | |
95 </list> | |
96 | |
97 </section> | |
98 | |
99 | |
100 <section name="Include files" id="include_files"> | |
101 | |
102 <para> | |
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103 The following two <literal>#include</literal> statements must appear at the |
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104 beginning of every nginx file: |
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105 </para> |
1899 | 106 |
107 <programlisting> | |
108 #include <ngx_config.h> | |
109 #include <ngx_core.h> | |
110 </programlisting> | |
111 | |
112 <para> | |
113 In addition to that, HTTP code should include | |
114 </para> | |
115 | |
116 | |
117 <programlisting> | |
118 #include <ngx_http.h> | |
119 </programlisting> | |
120 | |
121 <para> | |
122 Mail code should include | |
123 </para> | |
124 | |
125 | |
126 <programlisting> | |
127 #include <ngx_mail.h> | |
128 </programlisting> | |
129 | |
130 <para> | |
131 Stream code should include | |
132 </para> | |
133 | |
134 | |
135 <programlisting> | |
136 #include <ngx_stream.h> | |
137 </programlisting> | |
138 | |
139 </section> | |
140 | |
141 | |
142 <section name="Integers" id="integers"> | |
143 | |
144 <para> | |
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145 For general purposes, nginx code uses two integer types, |
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146 <literal>ngx_int_t</literal> and <literal>ngx_uint_t</literal>, which are |
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147 typedefs for <literal>intptr_t</literal> and <literal>uintptr_t</literal> |
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148 respectively. |
1899 | 149 </para> |
150 | |
151 </section> | |
152 | |
153 | |
154 <section name="Common return codes" id="common_return_codes"> | |
155 | |
156 <para> | |
157 Most functions in nginx return the following codes: | |
158 </para> | |
159 | |
160 <list type="bullet"> | |
161 | |
162 <listitem> | |
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163 <literal>NGX_OK</literal> — Operation succeeded. |
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164 </listitem> |
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165 |
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166 <listitem> |
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167 <literal>NGX_ERROR</literal> — Operation failed. |
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168 </listitem> |
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169 |
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170 <listitem> |
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171 <literal>NGX_AGAIN</literal> — Operation incomplete; call the function again. |
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172 </listitem> |
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173 |
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174 <listitem> |
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175 <literal>NGX_DECLINED</literal> — Operation rejected, for example, because it is |
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176 disabled in the configuration. This is never an error. |
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177 </listitem> |
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178 |
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179 <listitem> |
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180 <literal>NGX_BUSY</literal> — Resource is not available. |
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181 </listitem> |
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182 |
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183 <listitem> |
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184 <literal>NGX_DONE</literal> — Operation complete or continued elsewhere. |
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185 Also used as an alternative success code. |
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186 </listitem> |
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187 |
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188 <listitem> |
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189 <literal>NGX_ABORT</literal> — Function was aborted. |
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190 Also used as an alternative error code. |
1899 | 191 </listitem> |
192 | |
193 </list> | |
194 | |
195 </section> | |
196 | |
197 | |
198 <section name="Error handling" id="error_handling"> | |
199 | |
200 <para> | |
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201 The <literal>ngx_errno</literal> macro returns the last system error code. |
1899 | 202 It's mapped to <literal>errno</literal> on POSIX platforms and to |
203 <literal>GetLastError()</literal> call in Windows. | |
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204 The <literal>ngx_socket_errno</literal> macro returns the last socket error |
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205 number. |
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206 Like the <literal>ngx_errno</literal> macro, it's mapped to |
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207 <literal>errno</literal> on POSIX platforms. |
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208 It's mapped to the <literal>WSAGetLastError()</literal> call on Windows. |
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209 Accessing the values of <literal>ngx_errno</literal> or |
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210 <literal>ngx_socket_errno</literal> more than once in a row can cause |
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211 performance issues. |
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212 If the error value might be used multiple times, store it in a local variable |
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213 of type <literal>ngx_err_t</literal>. |
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214 To set errors, use the <literal>ngx_set_errno(errno)</literal> and |
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215 <literal>ngx_set_socket_errno(errno)</literal> macros. |
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216 </para> |
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217 |
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218 <para> |
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219 The values of <literal>ngx_errno</literal> and |
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220 <literal>ngx_socket_errno</literal> can be passed to the logging functions |
1899 | 221 <literal>ngx_log_error()</literal> and <literal>ngx_log_debugX()</literal>, in |
222 which case system error text is added to the log message. | |
223 </para> | |
224 | |
225 <para> | |
226 Example using <literal>ngx_errno</literal>: | |
227 </para> | |
228 | |
229 | |
230 <programlisting> | |
231 void | |
232 ngx_my_kill(ngx_pid_t pid, ngx_log_t *log, int signo) | |
233 { | |
234 ngx_err_t err; | |
235 | |
236 if (kill(pid, signo) == -1) { | |
237 err = ngx_errno; | |
238 | |
239 ngx_log_error(NGX_LOG_ALERT, log, err, "kill(%P, %d) failed", pid, signo); | |
240 | |
241 if (err == NGX_ESRCH) { | |
242 return 2; | |
243 } | |
244 | |
245 return 1; | |
246 } | |
247 | |
248 return 0; | |
249 } | |
250 </programlisting> | |
251 | |
252 </section> | |
253 | |
254 | |
255 </section> | |
256 | |
257 | |
258 <section name="Strings" id="strings"> | |
259 | |
260 | |
261 <section name="Overview" id="overview"> | |
262 | |
263 <para> | |
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264 For C strings, nginx uses the unsigned character type pointer |
1899 | 265 <literal>u_char *</literal>. |
266 </para> | |
267 | |
268 <para> | |
269 The nginx string type <literal>ngx_str_t</literal> is defined as follows: | |
270 </para> | |
271 | |
272 | |
273 <programlisting> | |
274 typedef struct { | |
275 size_t len; | |
276 u_char *data; | |
277 } ngx_str_t; | |
278 </programlisting> | |
279 | |
280 <para> | |
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281 The <literal>len</literal> field holds the string length and |
1899 | 282 <literal>data</literal> holds the string data. |
283 The string, held in <literal>ngx_str_t</literal>, may or may not be | |
284 null-terminated after the <literal>len</literal> bytes. | |
285 In most cases it’s not. | |
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286 However, in certain parts of the code (for example, when parsing configuration), |
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287 <literal>ngx_str_t</literal> objects are known to be null-terminated, which |
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288 simplifies string comparison and makes it easier to pass the strings to |
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289 syscalls. |
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290 </para> |
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291 |
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292 <para> |
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293 The string operations in nginx are declared in |
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294 <path>src/core/ngx_string.h</path> |
1899 | 295 Some of them are wrappers around standard C functions: |
296 </para> | |
297 | |
298 <para> | |
299 <list type="bullet"> | |
300 | |
301 <listitem> | |
302 <literal>ngx_strcmp()</literal> | |
303 </listitem> | |
304 | |
305 <listitem> | |
306 <literal>ngx_strncmp()</literal> | |
307 </listitem> | |
308 | |
309 <listitem> | |
310 <literal>ngx_strstr()</literal> | |
311 </listitem> | |
312 | |
313 <listitem> | |
314 <literal>ngx_strlen()</literal> | |
315 </listitem> | |
316 | |
317 <listitem> | |
318 <literal>ngx_strchr()</literal> | |
319 </listitem> | |
320 | |
321 <listitem> | |
322 <literal>ngx_memcmp()</literal> | |
323 </listitem> | |
324 | |
325 <listitem> | |
326 <literal>ngx_memset()</literal> | |
327 </listitem> | |
328 | |
329 <listitem> | |
330 <literal>ngx_memcpy()</literal> | |
331 </listitem> | |
332 | |
333 <listitem> | |
334 <literal>ngx_memmove()</literal> | |
335 </listitem> | |
336 | |
337 </list> | |
338 | |
339 </para> | |
340 | |
341 <para> | |
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342 Other string functions are nginx-specific |
1899 | 343 </para> |
344 | |
345 <para> | |
346 <list type="bullet"> | |
347 | |
348 <listitem> | |
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349 <literal>ngx_memzero()</literal> — Fills memory with zeroes. |
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350 </listitem> |
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351 |
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352 <listitem> |
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353 <literal>ngx_cpymem()</literal> — Does the same as |
1899 | 354 <literal>ngx_memcpy()</literal>, but returns the final destination address |
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355 This one is handy for appending multiple strings in a row. |
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356 </listitem> |
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357 |
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358 <listitem> |
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359 <literal>ngx_movemem()</literal> — Does the same as |
1899 | 360 <literal>ngx_memmove()</literal>, but returns the final destination address. |
361 </listitem> | |
362 | |
363 <listitem> | |
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364 <literal>ngx_strlchr()</literal> — Searches for a character in a string, |
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365 delimited by two pointers. |
1899 | 366 </listitem> |
367 </list> | |
368 </para> | |
369 | |
370 <para> | |
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371 The following functions perform case conversion and comparison: |
1899 | 372 </para> |
373 | |
374 <para> | |
375 <list type="bullet"> | |
376 | |
377 <listitem> | |
1999 | 378 <literal>ngx_tolower()</literal> |
379 </listitem> | |
380 | |
381 <listitem> | |
382 <literal>ngx_toupper()</literal> | |
383 </listitem> | |
384 | |
385 <listitem> | |
386 <literal>ngx_strlow()</literal> | |
387 </listitem> | |
388 | |
389 <listitem> | |
390 <literal>ngx_strcasecmp()</literal> | |
391 </listitem> | |
392 | |
393 <listitem> | |
394 <literal>ngx_strncasecmp()</literal> | |
1899 | 395 </listitem> |
396 | |
397 </list> | |
398 </para> | |
399 | |
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400 <para> |
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401 The following macros simplify string initialization: |
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402 </para> |
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403 |
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404 <list type="bullet"> |
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405 |
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406 <listitem> |
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407 <literal>ngx_string(text)</literal> — static initializer for the |
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408 <literal>ngx_str_t</literal> type from the C string literal |
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409 <literal>text</literal> |
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410 </listitem> |
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411 |
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412 <listitem> |
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413 <literal>ngx_null_string</literal> — static empty string initializer for the |
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414 <literal>ngx_str_t</literal> type |
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415 </listitem> |
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416 |
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417 <listitem> |
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418 <literal>ngx_str_set(str, text)</literal> — initializes string |
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419 <literal>str</literal> of <literal>ngx_str_t *</literal> type with the C string |
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420 literal <literal>text</literal> |
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421 </listitem> |
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422 |
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423 <listitem> |
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424 <literal>ngx_str_null(str)</literal> — initializes string <literal>str</literal> |
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425 of <literal>ngx_str_t *</literal> type with the empty string |
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426 </listitem> |
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427 |
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428 </list> |
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429 |
1899 | 430 </section> |
431 | |
432 | |
433 <section name="Formatting" id="formatting"> | |
434 | |
435 <para> | |
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436 The following formatting functions support nginx-specific types: |
1899 | 437 </para> |
438 | |
439 | |
440 <para> | |
441 <list type="bullet"> | |
442 | |
443 <listitem> | |
444 <literal>ngx_sprintf(buf, fmt, ...)</literal> | |
445 </listitem> | |
446 | |
447 <listitem> | |
448 <literal>ngx_snprintf(buf, max, fmt, ...)</literal> | |
449 </listitem> | |
450 | |
451 <listitem> | |
1975 | 452 <literal>ngx_slprintf(buf, last, fmt, ...)</literal> |
1899 | 453 </listitem> |
454 | |
455 <listitem> | |
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456 <literal>ngx_vslprintf(buf, last, fmt, args)</literal> |
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457 </listitem> |
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458 |
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459 <listitem> |
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460 <literal>ngx_vsnprintf(buf, max, fmt, args)</literal> |
1899 | 461 </listitem> |
462 | |
463 </list> | |
464 </para> | |
465 | |
466 <para> | |
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467 The full list of formatting options, supported by these functions is |
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468 in <path>src/core/ngx_string.c</path>. Some of them are: |
1899 | 469 </para> |
470 | |
471 | |
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472 <list type="bullet"> |
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473 |
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474 <listitem> |
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475 <literal>%O</literal> — <literal>off_t</literal> |
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476 </listitem> |
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477 |
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478 <listitem> |
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479 <literal>%T</literal> — <literal>time_t</literal> |
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480 </listitem> |
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481 |
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482 <listitem> |
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483 <literal>%z</literal> — <literal>ssize_t</literal> |
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484 </listitem> |
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485 |
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486 <listitem> |
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487 <literal>%i</literal> — <literal>ngx_int_t</literal> |
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488 </listitem> |
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489 |
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490 <listitem> |
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491 <literal>%p</literal> — <literal>void *</literal> |
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492 </listitem> |
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493 |
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494 <listitem> |
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495 <literal>%V</literal> — <literal>ngx_str_t *</literal> |
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496 </listitem> |
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497 |
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498 <listitem> |
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499 <literal>%s</literal> — <literal>u_char *</literal> (null-terminated) |
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500 </listitem> |
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501 |
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502 <listitem> |
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503 <literal>%*s</literal> — <literal>size_t + u_char *</literal> |
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504 </listitem> |
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505 |
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506 </list> |
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507 |
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508 |
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509 <para> |
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510 You can prepend <literal>u</literal> on most types to make them unsigned. |
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511 To convert output to hex, use <literal>X</literal> or <literal>x</literal>. |
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512 </para> |
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513 |
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514 <para> |
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515 For example: |
1899 | 516 |
517 <programlisting> | |
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518 u_char buf[NGX_INT_T_LEN]; |
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519 size_t len; |
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520 ngx_uint_t n; |
1899 | 521 |
522 /* set n here */ | |
523 | |
1935
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524 len = ngx_sprintf(buf, "%ui", n) — buf; |
1899 | 525 </programlisting> |
526 | |
527 </para> | |
528 | |
529 </section> | |
530 | |
531 | |
532 <section name="Numeric conversion" id="numeric_conversion"> | |
533 | |
534 <para> | |
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535 Several functions for numeric conversion are implemented in nginx. |
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536 The first four each convert a string of given length to a positive integer of |
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537 the indicated type. |
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538 They return <literal>NGX_ERROR</literal> on error. |
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539 |
1899 | 540 <list type="bullet"> |
541 | |
542 <listitem> | |
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543 <literal>ngx_atoi(line, n)</literal> — <literal>ngx_int_t</literal> |
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544 </listitem> |
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545 |
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546 <listitem> |
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547 <literal>ngx_atosz(line, n)</literal> — <literal>ssize_t</literal> |
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548 </listitem> |
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549 |
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550 <listitem> |
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551 <literal>ngx_atoof(line, n)</literal> — <literal>off_t</literal> |
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552 </listitem> |
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553 |
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554 <listitem> |
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555 <literal>ngx_atotm(line, n)</literal> — <literal>time_t</literal> |
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556 </listitem> |
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557 |
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558 </list> |
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559 </para> |
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560 |
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561 <para> |
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562 There are two additional numeric conversion functions. |
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563 Like the first four, they return <literal>NGX_ERROR</literal> on error. |
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|
564 |
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565 <list type="bullet"> |
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566 |
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567 <listitem> |
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568 <literal>ngx_atofp(line, n, point)</literal> — Converts a fixed point floating |
1899 | 569 number of given length to a positive integer of type |
570 <literal>ngx_int_t</literal>. | |
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571 The result is shifted left by <literal>point</literal> decimal |
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572 positions. |
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573 The string representation of the number is expected to have no more |
1899 | 574 than <literal>points</literal> fractional digits. |
1993
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575 For example, <literal>ngx_atofp("10.5", 4, 2)</literal> returns |
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576 <literal>1050</literal>. |
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577 </listitem> |
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578 |
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579 <listitem> |
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580 <literal>ngx_hextoi(line, n)</literal> — Converts a hexadecimal representation |
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581 of a positive integer to <literal>ngx_int_t</literal>. |
1899 | 582 </listitem> |
583 | |
584 </list> | |
585 </para> | |
586 | |
587 </section> | |
588 | |
1919
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589 <section name="Regular expressions" id="regex"> |
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590 |
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591 <para> |
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592 The regular expressions interface in nginx is a wrapper around |
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593 the <link url="http://www.pcre.org">PCRE</link> |
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|
594 library. |
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595 The corresponding header file is <path>src/core/ngx_regex.h</path>. |
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596 </para> |
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597 |
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598 <para> |
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599 To use a regular expression for string matching, it first needs to be |
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600 compiled, which is usually done at the configuration phase. |
1919
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601 Note that since PCRE support is optional, all code using the interface must |
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602 be protected by the surrounding <literal>NGX_PCRE</literal> macro: |
1993
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603 |
1919
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604 <programlisting> |
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605 #if (NGX_PCRE) |
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606 ngx_regex_t *re; |
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|
607 ngx_regex_compile_t rc; |
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608 |
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609 u_char errstr[NGX_MAX_CONF_ERRSTR]; |
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610 |
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611 ngx_str_t value = ngx_string("message (\\d\\d\\d).*Codeword is '(?<cw>\\w+)'"); |
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612 |
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613 ngx_memzero(&rc, sizeof(ngx_regex_compile_t)); |
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614 |
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615 rc.pattern = value; |
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616 rc.pool = cf->pool; |
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617 rc.err.len = NGX_MAX_CONF_ERRSTR; |
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618 rc.err.data = errstr; |
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619 /* rc.options are passed as is to pcre_compile() */ |
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620 |
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621 if (ngx_regex_compile(&rc) != NGX_OK) { |
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622 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err); |
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623 return NGX_CONF_ERROR; |
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624 } |
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|
625 |
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|
626 re = rc.regex; |
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627 #endif |
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|
628 </programlisting> |
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629 After successful compilation, the <literal>captures</literal> and |
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|
630 <literal>named_captures</literal> fields in the |
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631 <literal>ngx_regex_compile_t</literal> structure contain the count of all |
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632 captures and named captures, respectively, found in the regular expression. |
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633 </para> |
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634 |
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|
635 <para> |
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|
636 The compiled regular expression can then be used for matching against strings: |
1919
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637 <programlisting> |
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|
638 ngx_int_t n; |
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639 int captures[(1 + rc.captures) * 3]; |
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|
640 |
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|
641 ngx_str_t input = ngx_string("This is message 123. Codeword is 'foobar'."); |
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|
642 |
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|
643 n = ngx_regex_exec(re, &input, captures, (1 + rc.captures) * 3); |
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|
644 if (n >= 0) { |
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|
645 /* string matches expression */ |
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|
646 |
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647 } else if (n == NGX_REGEX_NO_MATCHED) { |
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648 /* no match was found */ |
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|
649 |
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650 } else { |
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|
651 /* some error */ |
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652 ngx_log_error(NGX_LOG_ALERT, log, 0, ngx_regex_exec_n " failed: %i", n); |
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653 } |
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|
654 </programlisting> |
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|
655 The arguments to <literal>ngx_regex_exec()</literal> are the compiled regular |
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|
656 expression <literal>re</literal>, the string to match <literal>s</literal>, |
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|
657 an optional array of integers to hold any <literal>captures</literal> that are |
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|
658 found, and the array's <literal>size</literal>. |
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659 The size of the <literal>captures</literal> array must be a multiple of three, |
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|
660 as required by the |
1919
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|
661 <link url="http://www.pcre.org/original/doc/html/pcreapi.html">PCRE API</link>. |
1993
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|
662 In the example, the size is calculated from the total number of captures plus |
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|
663 <literal>1</literal>one for the matched string itself. |
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|
664 </para> |
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|
665 |
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|
666 <para> |
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|
667 If there are matches, captures can be accessed as follows: |
1919
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668 <programlisting> |
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changeset
|
669 u_char *p; |
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Added the "Regular expressions" section to the development guide.
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|
670 size_t size; |
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Added the "Regular expressions" section to the development guide.
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1915
diff
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|
671 ngx_str_t name, value; |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
672 |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
673 /* all captures */ |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
674 for (i = 0; i < n * 2; i += 2) { |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
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parents:
1915
diff
changeset
|
675 value.data = input.data + captures[i]; |
1935
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|
676 value.len = captures[i + 1] — captures[i]; |
1919
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Added the "Regular expressions" section to the development guide.
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parents:
1915
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|
677 } |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
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|
678 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
679 /* accessing named captures */ |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
680 |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
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diff
changeset
|
681 size = rc.name_size; |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
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diff
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|
682 p = rc.names; |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
683 |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
684 for (i = 0; i < rc.named_captures; i++, p += size) { |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
685 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
686 /* capture name */ |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
687 name.data = &p[2]; |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
688 name.len = ngx_strlen(name.data); |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
689 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
690 n = 2 * ((p[0] << 8) + p[1]); |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
691 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
692 /* captured value */ |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
693 value.data = &input.data[captures[n]]; |
1935
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
694 value.len = captures[n + 1] — captures[n]; |
1919
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
695 } |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
696 </programlisting> |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
697 </para> |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
698 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
699 <para> |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
700 The <literal>ngx_regex_exec_array()</literal> function accepts the array of |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
701 <literal>ngx_regex_elt_t</literal> elements (which are just compiled regular |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
702 expressions with associated names), a string to match, and a log. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
703 The function applies expressions from the array to the string until |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
704 either a match is found or no more expressions are left. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
705 The return value is <literal>NGX_OK</literal> when there is a match and |
1919
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
706 <literal>NGX_DECLINED</literal> otherwise, or <literal>NGX_ERROR</literal> |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
707 in case of error. |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
708 </para> |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
709 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
710 </section> |
1899 | 711 |
712 </section> | |
713 | |
714 | |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
715 <section name="Time" id="time"> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
716 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
717 <para> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
718 The <literal>ngx_time_t</literal> structure represents time with three separate |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
719 types for seconds, milliseconds, and the GMT offset: |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
720 <programlisting> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
721 typedef struct { |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
722 time_t sec; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
723 ngx_uint_t msec; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
724 ngx_int_t gmtoff; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
725 } ngx_time_t; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
726 </programlisting> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
727 The <literal>ngx_tm_t</literal> structure is an alias for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
728 <literal>struct tm</literal> on UNIX platforms and <literal>SYSTEMTIME</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
729 on Windows. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
730 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
731 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
732 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
733 To obtain the current time, it is usually sufficient to access one of the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
734 available global variables, representing the cached time value in the desired |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
735 format. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
736 For example, the <literal>ngx_current_msec</literal> variable holds the number |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
737 of milliseconds elapsed since Epoch and truncated to |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
738 <literal>ngx_msec_t</literal>. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
739 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
740 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
741 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
742 The available string representations are: |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
743 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
744 <list type="bullet"> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
745 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
746 <listitem> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
747 <literal>ngx_cached_err_log_time</literal> — Used in error log entries: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
748 <literal>"1970/09/28 12:00:00"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
749 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
750 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
751 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
752 <literal>ngx_cached_http_log_time</literal> — Used in HTTP access log entries: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
753 <literal>"28/Sep/1970:12:00:00 +0600"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
754 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
755 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
756 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
757 <literal>ngx_cached_syslog_time</literal> — Used in syslog entries: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
758 <literal>"Sep 28 12:00:00"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
759 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
760 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
761 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
762 <literal>ngx_cached_http_time</literal> — Used in HTTP headers: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
763 <literal>"Mon, 28 Sep 1970 06:00:00 GMT"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
764 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
765 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
766 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
767 <literal>ngx_cached_http_log_iso8601</literal> — The ISO 8601 |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
768 standard format: |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
769 <literal>"1970-09-28T12:00:00+06:00"</literal> |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
770 </listitem> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
771 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
772 </list> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
773 </para> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
774 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
775 <para> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
776 The <literal>ngx_time()</literal> and <literal>ngx_timeofday()</literal> macros |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
777 return the current time value in seconds and are the preferred way to access |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
778 the cached time value. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
779 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
780 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
781 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
782 To obtain the time explicitly, use <literal>ngx_gettimeofday()</literal>, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
783 which updates its argument (pointer to |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
784 <literal>struct timeval</literal>). |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
785 The time is always updated when nginx returns to the event loop from system |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
786 calls. |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
787 To update the time immediately, call <literal>ngx_time_update()</literal>, |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
788 or <literal>ngx_time_sigsafe_update()</literal> if updating the time in the |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
789 signal handler context. |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
790 </para> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
791 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
792 <para> |
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793 The following functions convert <literal>time_t</literal> into the indicated |
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794 broken-down time representation. |
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795 The first function in each pair converts <literal>time_t</literal> to |
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796 <literal>ngx_tm_t</literal> and the second (with the <literal>_libc_</literal> |
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797 infix) to <literal>struct tm</literal>: |
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798 |
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799 <list type="bullet"> |
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800 |
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801 <listitem> |
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802 <literal>ngx_gmtime(), ngx_libc_gmtime()</literal> — Time expressed as UTC |
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803 </listitem> |
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804 |
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805 <listitem> |
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806 <literal>ngx_localtime(), ngx_libc_localtime()</literal> — Time expressed |
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807 relative to the local time zone |
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808 </listitem> |
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809 |
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810 </list> |
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811 |
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812 The <literal>ngx_http_time(buf, time)</literal> function returns a string |
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813 representation suitable for use in HTTP headers (for example, |
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814 <literal>"Mon, 28 Sep 1970 06:00:00 GMT"</literal>). |
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815 The <literal>ngx_http_cookie_time(buf, time)</literal> returns a string |
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816 representation function returns a string representation suitable |
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817 for HTTP cookies (<literal>"Thu, 31-Dec-37 23:55:55 GMT"</literal>). |
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818 </para> |
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819 |
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820 </section> |
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821 |
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822 |
1899 | 823 <section name="Containers" id="containers"> |
824 | |
825 | |
826 <section name="Array" id="array"> | |
827 | |
828 <para> | |
829 The nginx array type <literal>ngx_array_t</literal> is defined as follows | |
830 </para> | |
831 | |
832 | |
833 <programlisting> | |
834 typedef struct { | |
835 void *elts; | |
836 ngx_uint_t nelts; | |
837 size_t size; | |
838 ngx_uint_t nalloc; | |
839 ngx_pool_t *pool; | |
840 } ngx_array_t; | |
841 </programlisting> | |
842 | |
843 <para> | |
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844 The elements of the array are available in the <literal>elts</literal> field. |
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845 The <literal>nelts</literal> field holds the number of elements. |
1899 | 846 The <literal>size</literal> field holds the size of a single element and is set |
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847 when the array is initialized. |
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848 </para> |
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849 |
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850 <para> |
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851 Use the <literal>ngx_array_create(pool, n, size)</literal> call to create an |
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852 array in a pool, and the <literal>ngx_array_init(array, pool, n, size)</literal> |
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853 call to initialize an array object that has already been allocated. |
1899 | 854 </para> |
855 | |
856 | |
857 <programlisting> | |
858 ngx_array_t *a, b; | |
859 | |
860 /* create an array of strings with preallocated memory for 10 elements */ | |
861 a = ngx_array_create(pool, 10, sizeof(ngx_str_t)); | |
862 | |
863 /* initialize string array for 10 elements */ | |
864 ngx_array_init(&b, pool, 10, sizeof(ngx_str_t)); | |
865 </programlisting> | |
866 | |
867 <para> | |
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868 Use the following functions to add elements to an array: |
1899 | 869 </para> |
870 | |
871 <para> | |
872 <list type="bullet"> | |
873 | |
874 <listitem> | |
875 <literal>ngx_array_push(a)</literal> adds one tail element and returns pointer | |
876 to it | |
877 </listitem> | |
878 | |
879 <listitem> | |
880 <literal>ngx_array_push_n(a, n)</literal> adds <literal>n</literal> tail elements | |
881 and returns pointer to the first one | |
882 </listitem> | |
883 | |
884 </list> | |
885 </para> | |
886 | |
887 <para> | |
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888 If the currently allocated amount of memory is not large enough to accommodate |
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889 the new elements, a new block of memory is allocated and the existing elements |
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|
890 are copied to it. |
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891 The new memory block is normally twice as large as the existing one. |
1899 | 892 </para> |
893 | |
894 | |
895 <programlisting> | |
896 s = ngx_array_push(a); | |
897 ss = ngx_array_push_n(&b, 3); | |
898 </programlisting> | |
899 | |
900 </section> | |
901 | |
902 | |
903 <section name="List" id="list"> | |
904 | |
905 <para> | |
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906 In nginx a list is a sequence of arrays, optimized for inserting a potentially |
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907 large number of items. |
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908 The <literal>ngx_list_t</literal> list type is defined as follows: |
1899 | 909 </para> |
910 | |
911 | |
912 <programlisting> | |
913 typedef struct { | |
914 ngx_list_part_t *last; | |
915 ngx_list_part_t part; | |
916 size_t size; | |
917 ngx_uint_t nalloc; | |
918 ngx_pool_t *pool; | |
919 } ngx_list_t; | |
920 </programlisting> | |
921 | |
922 <para> | |
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923 The actual items are stored in list parts, which are defined as follows: |
1899 | 924 </para> |
925 | |
926 | |
927 <programlisting> | |
928 typedef struct ngx_list_part_s ngx_list_part_t; | |
929 | |
930 struct ngx_list_part_s { | |
931 void *elts; | |
932 ngx_uint_t nelts; | |
933 ngx_list_part_t *next; | |
934 }; | |
935 </programlisting> | |
936 | |
937 <para> | |
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938 Before use, a list must be initialized by calling |
1899 | 939 <literal>ngx_list_init(list, pool, n, size)</literal> or created by calling |
940 <literal>ngx_list_create(pool, n, size)</literal>. | |
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941 Both functions take as arguments the size of a single item and a number of |
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942 items per list part. |
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943 To add an item to a list, use the <literal>ngx_list_push(list)</literal> |
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944 function. |
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945 To iterate over the items, directly access the list fields as shown in the |
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946 example: |
1899 | 947 </para> |
948 | |
949 | |
950 <programlisting> | |
951 ngx_str_t *v; | |
952 ngx_uint_t i; | |
953 ngx_list_t *list; | |
954 ngx_list_part_t *part; | |
955 | |
956 list = ngx_list_create(pool, 100, sizeof(ngx_str_t)); | |
957 if (list == NULL) { /* error */ } | |
958 | |
959 /* add items to the list */ | |
960 | |
961 v = ngx_list_push(list); | |
962 if (v == NULL) { /* error */ } | |
1936
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963 ngx_str_set(v, "foo"); |
1899 | 964 |
965 v = ngx_list_push(list); | |
966 if (v == NULL) { /* error */ } | |
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967 ngx_str_set(v, "bar"); |
1899 | 968 |
969 /* iterate over the list */ | |
970 | |
971 part = &list->part; | |
972 v = part->elts; | |
973 | |
974 for (i = 0; /* void */; i++) { | |
975 | |
976 if (i >= part->nelts) { | |
977 if (part->next == NULL) { | |
978 break; | |
979 } | |
980 | |
981 part = part->next; | |
982 v = part->elts; | |
983 i = 0; | |
984 } | |
985 | |
986 ngx_do_smth(&v[i]); | |
987 } | |
988 </programlisting> | |
989 | |
990 <para> | |
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991 Lists are primarily used for HTTP input and output headers. |
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992 </para> |
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993 |
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994 <para> |
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995 Lists do not support item removal. |
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996 However, when needed, items can internally be marked as missing without actually |
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997 being removed from the list. |
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998 For example, to mark HTTP output headers (which are stored as |
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999 <literal>ngx_table_elt_t</literal> objects) as missing, set the |
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1000 <literal>hash</literal> field in <literal>ngx_table_elt_t</literal> to |
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1001 zero. |
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1002 Items marked in this way are explicitly skipped when the headers are iterated |
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1003 over. |
1899 | 1004 </para> |
1005 | |
1006 </section> | |
1007 | |
1008 | |
1009 <section name="Queue" id="queue"> | |
1010 | |
1011 <para> | |
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1012 In nginx a queue is an intrusive doubly linked list, with each node defined as |
1899 | 1013 follows: |
1014 </para> | |
1015 | |
1016 | |
1017 <programlisting> | |
1018 typedef struct ngx_queue_s ngx_queue_t; | |
1019 | |
1020 struct ngx_queue_s { | |
1021 ngx_queue_t *prev; | |
1022 ngx_queue_t *next; | |
1023 }; | |
1024 </programlisting> | |
1025 | |
1026 <para> | |
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1027 The head queue node is not linked with any data. |
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1028 Use the <literal>ngx_queue_init(q)</literal> call to initialize the list head |
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1029 before use. |
1899 | 1030 Queues support the following operations: |
1031 </para> | |
1032 | |
1033 <para> | |
1034 <list type="bullet"> | |
1035 | |
1036 <listitem> | |
1037 <literal>ngx_queue_insert_head(h, x)</literal>, | |
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1038 <literal>ngx_queue_insert_tail(h, x)</literal> — Insert a new node |
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1039 </listitem> |
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1040 |
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1041 <listitem> |
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1042 <literal>ngx_queue_remove(x)</literal> — Remove a queue node |
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1043 </listitem> |
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1044 |
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1045 <listitem> |
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1046 <literal>ngx_queue_split(h, q, n)</literal> — Split a queue at a node, |
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1047 returning the queue tail in a separate queue |
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1048 </listitem> |
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1049 |
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1050 <listitem> |
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1051 <literal>ngx_queue_add(h, n)</literal> — Add a second queue to the first queue |
1899 | 1052 </listitem> |
1053 | |
1054 <listitem> | |
1055 <literal>ngx_queue_head(h)</literal>, | |
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1056 <literal>ngx_queue_last(h)</literal> — Get first or last queue node |
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1057 </listitem> |
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1058 |
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|
1059 <listitem> |
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1060 <literal>ngx_queue_sentinel(h)</literal> - Get a queue sentinel object to end |
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|
1061 iteration at |
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|
1062 </listitem> |
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|
1063 |
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|
1064 <listitem> |
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|
1065 <literal>ngx_queue_data(q, type, link)</literal> — Get a reference to the |
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|
1066 beginning of a queue node data structure, considering the queue field offset in |
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|
1067 it |
1899 | 1068 </listitem> |
1069 | |
1070 </list> | |
1071 </para> | |
1072 | |
1073 <para> | |
1993
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|
1074 An example: |
1899 | 1075 </para> |
1076 | |
1077 | |
1078 <programlisting> | |
1079 typedef struct { | |
1080 ngx_str_t value; | |
1081 ngx_queue_t queue; | |
1082 } ngx_foo_t; | |
1083 | |
1084 ngx_foo_t *f; | |
2008
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DevGuide: fixed queue example.
Vladimir Homutov <vl@nginx.com>
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2007
diff
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|
1085 ngx_queue_t values, *q; |
1899 | 1086 |
1087 ngx_queue_init(&values); | |
1088 | |
1089 f = ngx_palloc(pool, sizeof(ngx_foo_t)); | |
1090 if (f == NULL) { /* error */ } | |
1936
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|
1091 ngx_str_set(&f->value, "foo"); |
1899 | 1092 |
2008
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parents:
2007
diff
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|
1093 ngx_queue_insert_tail(&values, &f->queue); |
1899 | 1094 |
1095 /* insert more nodes here */ | |
1096 | |
1097 for (q = ngx_queue_head(&values); | |
1098 q != ngx_queue_sentinel(&values); | |
1099 q = ngx_queue_next(q)) | |
1100 { | |
1101 f = ngx_queue_data(q, ngx_foo_t, queue); | |
1102 | |
1103 ngx_do_smth(&f->value); | |
1104 } | |
1105 </programlisting> | |
1106 | |
1107 </section> | |
1108 | |
1109 | |
1110 <section name="Red-Black tree" id="red_black_tree"> | |
1111 | |
1112 <para> | |
1915
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1113 The <path>src/core/ngx_rbtree.h</path> header file provides access to the |
1899 | 1114 effective implementation of red-black trees. |
1115 </para> | |
1116 | |
1117 | |
1118 <programlisting> | |
1119 typedef struct { | |
1120 ngx_rbtree_t rbtree; | |
1121 ngx_rbtree_node_t sentinel; | |
1122 | |
1123 /* custom per-tree data here */ | |
1124 } my_tree_t; | |
1125 | |
1126 typedef struct { | |
1127 ngx_rbtree_node_t rbnode; | |
1128 | |
1129 /* custom per-node data */ | |
1130 foo_t val; | |
1131 } my_node_t; | |
1132 </programlisting> | |
1133 | |
1134 <para> | |
1135 To deal with a tree as a whole, you need two nodes: root and sentinel. | |
1993
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|
1136 Typically, they are added to a custom structure, allowing you to |
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|
1137 organize your data into a tree in which the leaves contain a link to or embed |
1899 | 1138 your data. |
1139 </para> | |
1140 | |
1141 <para> | |
1142 To initialize a tree: | |
1143 </para> | |
1144 | |
1145 | |
1146 <programlisting> | |
1147 my_tree_t root; | |
1148 | |
1149 ngx_rbtree_init(&root.rbtree, &root.sentinel, insert_value_function); | |
1150 </programlisting> | |
1151 | |
1152 <para> | |
1993
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|
1153 To traverse a tree and insert new values, use the |
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|
1154 "<literal>insert_value</literal>" functions. |
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|
1155 For example, the <literal>ngx_str_rbtree_insert_value</literal> function deals |
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|
1156 with the <literal>ngx_str_t</literal> type. |
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|
1157 Its arguments are pointers to a root node of an insertion, the newly created |
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Language and style fixes in development guide.
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1983
diff
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|
1158 node to be added, and a tree sentinel. |
1899 | 1159 </para> |
1160 | |
1161 | |
1162 <programlisting> | |
1163 void ngx_str_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1164 ngx_rbtree_node_t *node, | |
1165 ngx_rbtree_node_t *sentinel) | |
1166 </programlisting> | |
1167 | |
1168 | |
1169 <para> | |
1170 The traversal is pretty straightforward and can be demonstrated with the | |
1171 following lookup function pattern: | |
1172 </para> | |
1173 | |
1174 | |
1175 <programlisting> | |
1176 my_node_t * | |
1177 my_rbtree_lookup(ngx_rbtree_t *rbtree, foo_t *val, uint32_t hash) | |
1178 { | |
1179 ngx_int_t rc; | |
1180 my_node_t *n; | |
1181 ngx_rbtree_node_t *node, *sentinel; | |
1182 | |
1183 node = rbtree->root; | |
1184 sentinel = rbtree->sentinel; | |
1185 | |
1186 while (node != sentinel) { | |
1187 | |
1188 n = (my_node_t *) node; | |
1189 | |
1190 if (hash != node->key) { | |
1191 node = (hash < node->key) ? node->left : node->right; | |
1192 continue; | |
1193 } | |
1194 | |
1195 rc = compare(val, node->val); | |
1196 | |
1197 if (rc < 0) { | |
1198 node = node->left; | |
1199 continue; | |
1200 } | |
1201 | |
1202 if (rc > 0) { | |
1203 node = node->right; | |
1204 continue; | |
1205 } | |
1206 | |
1207 return n; | |
1208 } | |
1209 | |
1210 return NULL; | |
1211 } | |
1212 </programlisting> | |
1213 | |
1214 <para> | |
1993
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|
1215 The <literal>compare()</literal> function is a classic comparator function that |
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1983
diff
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|
1216 returns a value less than, equal to, or greater than zero. |
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|
1217 To speed up lookups and avoid comparing user objects that can be big, an integer |
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|
1218 hash field is used. |
1899 | 1219 </para> |
1220 | |
1221 <para> | |
1222 To add a node to a tree, allocate a new node, initialize it and call | |
1223 <literal>ngx_rbtree_insert()</literal>: | |
1224 </para> | |
1225 | |
1226 | |
1227 <programlisting> | |
1228 my_node_t *my_node; | |
1229 ngx_rbtree_node_t *node; | |
1230 | |
1231 my_node = ngx_palloc(...); | |
1232 init_custom_data(&my_node->val); | |
1233 | |
1234 node = &my_node->rbnode; | |
1235 node->key = create_key(my_node->val); | |
1236 | |
1237 ngx_rbtree_insert(&root->rbtree, node); | |
1238 </programlisting> | |
1239 | |
1240 <para> | |
1993
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diff
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|
1241 To remove a node, call the <literal>ngx_rbtree_delete()</literal> function: |
1899 | 1242 </para> |
1243 | |
1244 | |
1245 <programlisting> | |
1246 ngx_rbtree_delete(&root->rbtree, node); | |
1247 </programlisting> | |
1248 | |
1249 </section> | |
1250 | |
1914
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1907
diff
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|
1251 <section name="Hash" id="hash"> |
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parents:
1907
diff
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|
1252 |
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diff
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|
1253 <para> |
1920 | 1254 Hash table functions are declared in <path>src/core/ngx_hash.h</path>. |
1993
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|
1255 Both exact and wildcard matching are supported. |
1914
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Added hash API description.
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diff
changeset
|
1256 The latter requires extra setup and is described in a separate section below. |
f8659301a260
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diff
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|
1257 </para> |
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diff
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|
1258 |
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|
1259 <para> |
1993
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|
1260 Before initializing a hash, you need to know the number of elements it will |
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diff
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|
1261 hold so that nginx can build it optimally. |
1914
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Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
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|
1262 Two parameters that need to be configured are <literal>max_size</literal> |
1993
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1983
diff
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|
1263 and <literal>bucket_size</literal>, as detailed in a separate |
1914
f8659301a260
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1907
diff
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|
1264 <link doc="../hash.xml">document</link>. |
1993
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|
1265 They are usually configurable by the user. |
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|
1266 Hash initialization settings are stored with the |
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|
1267 <literal>ngx_hash_init_t</literal> type, and the hash itself is |
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|
1268 <literal>ngx_hash_t</literal>: |
1914
f8659301a260
Added hash API description.
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diff
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|
1269 <programlisting> |
f8659301a260
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diff
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|
1270 ngx_hash_t foo_hash; |
f8659301a260
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parents:
1907
diff
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|
1271 ngx_hash_init_t hash; |
f8659301a260
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parents:
1907
diff
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|
1272 |
f8659301a260
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1907
diff
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|
1273 hash.hash = &foo_hash; |
f8659301a260
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1907
diff
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|
1274 hash.key = ngx_hash_key; |
f8659301a260
Added hash API description.
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parents:
1907
diff
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|
1275 hash.max_size = 512; |
f8659301a260
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parents:
1907
diff
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|
1276 hash.bucket_size = ngx_align(64, ngx_cacheline_size); |
f8659301a260
Added hash API description.
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parents:
1907
diff
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|
1277 hash.name = "foo_hash"; |
f8659301a260
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diff
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|
1278 hash.pool = cf->pool; |
f8659301a260
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diff
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|
1279 hash.temp_pool = cf->temp_pool; |
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diff
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|
1280 </programlisting> |
1993
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|
1281 The <literal>key</literal> is a pointer to a function that creates the hash |
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|
1282 integer key from a string. |
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|
1283 There are two generic key-creation functions: |
1914
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diff
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|
1284 <literal>ngx_hash_key(data, len)</literal> and |
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diff
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|
1285 <literal>ngx_hash_key_lc(data, len)</literal>. |
1993
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|
1286 The latter converts a string to all lowercase characters, so the passed string |
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|
1287 must be writeable. |
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|
1288 If that is not true, pass the <literal>NGX_HASH_READONLY_KEY</literal> flag |
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|
1289 to the function, initializing the key array (see below). |
1914
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diff
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|
1290 </para> |
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|
1291 |
f8659301a260
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|
1292 <para> |
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|
1293 The hash keys are stored in <literal>ngx_hash_keys_arrays_t</literal> and |
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parents:
1907
diff
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|
1294 are initialized with <literal>ngx_hash_keys_array_init(arr, type)</literal>: |
1993
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1295 The second parameter (<literal>type</literal>) controls the amount of resources |
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|
1296 preallocated for the hash and can be either <literal>NGX_HASH_SMALL</literal> or |
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|
1297 <literal>NGX_HASH_LARGE</literal>. |
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|
1298 The latter is appropriate if you expect the hash to contain thousands of |
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|
1299 elements. |
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|
1300 |
1914
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|
1301 <programlisting> |
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|
1302 ngx_hash_keys_arrays_t foo_keys; |
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diff
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|
1303 |
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|
1304 foo_keys.pool = cf->pool; |
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parents:
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diff
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|
1305 foo_keys.temp_pool = cf->temp_pool; |
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|
1306 |
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|
1307 ngx_hash_keys_array_init(&foo_keys, NGX_HASH_SMALL); |
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diff
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|
1308 </programlisting> |
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1309 </para> |
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|
1310 |
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|
1311 <para> |
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diff
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|
1312 To insert keys into a hash keys array, use the |
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diff
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|
1313 <literal>ngx_hash_add_key(keys_array, key, value, flags)</literal> function: |
1914
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|
1314 <programlisting> |
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|
1315 ngx_str_t k1 = ngx_string("key1"); |
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|
1316 ngx_str_t k2 = ngx_string("key2"); |
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|
1317 |
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Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
1318 ngx_hash_add_key(&foo_keys, &k1, &my_data_ptr_1, NGX_HASH_READONLY_KEY); |
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Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1319 ngx_hash_add_key(&foo_keys, &k2, &my_data_ptr_2, NGX_HASH_READONLY_KEY); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1320 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1321 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1322 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1323 <para> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1324 To build the hash table, call the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1325 <literal>ngx_hash_init(hinit, key_names, nelts)</literal> function: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1326 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1327 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1328 ngx_hash_init(&hash, foo_keys.keys.elts, foo_keys.keys.nelts); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1329 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1330 |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1331 The function fails if <literal>max_size</literal> or |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1332 <literal>bucket_size</literal> parameters are not big enough. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1333 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1334 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1335 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1336 When the hash is built, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1337 <literal>ngx_hash_find(hash, key, name, len)</literal> function to look up |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1338 elements: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1339 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1340 my_data_t *data; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1341 ngx_uint_t key; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1342 |
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Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1343 key = ngx_hash_key(k1.data, k1.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1344 |
f8659301a260
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Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1345 data = ngx_hash_find(&foo_hash, key, k1.data, k1.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1346 if (data == NULL) { |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1347 /* key not found */ |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1348 } |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1349 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1350 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1351 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1352 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1353 <section name="Wildcard matching" id="wildcard_matching"> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1354 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1355 <para> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1356 To create a hash that works with wildcards, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1357 <literal>ngx_hash_combined_t</literal> type. |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1358 It includes the hash type described above and has two additional keys arrays: |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1359 <literal>dns_wc_head</literal> and <literal>dns_wc_tail</literal>. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1360 The initialization of basic properties is similar to a regular hash: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1361 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1362 ngx_hash_init_t hash |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1363 ngx_hash_combined_t foo_hash; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1364 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1365 hash.hash = &foo_hash.hash; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1366 hash.key = ...; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1367 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1368 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1369 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1370 <para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1371 It is possible to add wildcard keys using the |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1372 <literal>NGX_HASH_WILDCARD_KEY</literal> flag: |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1373 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1374 /* k1 = ".example.org"; */ |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1375 /* k2 = "foo.*"; */ |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1376 ngx_hash_add_key(&foo_keys, &k1, &data1, NGX_HASH_WILDCARD_KEY); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1377 ngx_hash_add_key(&foo_keys, &k2, &data2, NGX_HASH_WILDCARD_KEY); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1378 </programlisting> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1379 The function recognizes wildcards and adds keys into the corresponding arrays. |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1380 Please refer to the |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1381 <link doc="../http/ngx_http_map_module.xml" id="map"/> module |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1382 documentation for the description of the wildcard syntax and the |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1383 matching algorithm. |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1384 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1385 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1386 <para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1387 Depending on the contents of added keys, you may need to initialize up to three |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1388 key arrays: one for exact matching (described above), and two more to enable |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1389 matching starting from the head or tail of a string: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1390 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1391 if (foo_keys.dns_wc_head.nelts) { |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1392 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1393 ngx_qsort(foo_keys.dns_wc_head.elts, |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1394 (size_t) foo_keys.dns_wc_head.nelts, |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1395 sizeof(ngx_hash_key_t), |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1396 cmp_dns_wildcards); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1397 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1398 hash.hash = NULL; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1399 hash.temp_pool = pool; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1400 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1401 if (ngx_hash_wildcard_init(&hash, foo_keys.dns_wc_head.elts, |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1402 foo_keys.dns_wc_head.nelts) |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1403 != NGX_OK) |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1404 { |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1405 return NGX_ERROR; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1406 } |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1407 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1408 foo_hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1409 } |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1410 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1411 The keys array needs to be sorted, and initialization results must be added |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1412 to the combined hash. |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1413 The initialization of <literal>dns_wc_tail</literal> array is done similarly. |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1414 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1415 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1416 <para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1417 The lookup in a combined hash is handled by the |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1418 <literal>ngx_hash_find_combined(chash, key, name, len)</literal>: |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1419 <programlisting> |
1935
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
1420 /* key = "bar.example.org"; — will match ".example.org" */ |
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
1421 /* key = "foo.example.com"; — will match "foo.*" */ |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1422 |
f8659301a260
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Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1423 hkey = ngx_hash_key(key.data, key.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1424 res = ngx_hash_find_combined(&foo_hash, hkey, key.data, key.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1425 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1426 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1427 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1428 </section> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1429 |
f8659301a260
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diff
changeset
|
1430 </section> |
1899 | 1431 |
1432 </section> | |
1433 | |
1434 | |
1435 <section name="Memory management" id="memory_management"> | |
1436 | |
1437 | |
1438 <section name="Heap" id="heap"> | |
1439 | |
1440 <para> | |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1441 To allocate memory from system heap, use the following functions: |
1899 | 1442 </para> |
1443 | |
1444 <para> | |
1445 <list type="bullet"> | |
1446 | |
1447 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1448 <literal>ngx_alloc(size, log)</literal> — Allocate memory from system heap. |
1899 | 1449 This is a wrapper around <literal>malloc()</literal> with logging support. |
1993
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parents:
1983
diff
changeset
|
1450 Allocation error and debugging information is logged to <literal>log</literal>. |
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Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1451 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1452 |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1453 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1454 <literal>ngx_calloc(size, log)</literal> — Allocate memory from system heap |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1455 like <literal>ngx_alloc()</literal>, but fill memory with zeros after |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1456 allocation. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1457 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1458 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1459 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1460 <literal>ngx_memalign(alignment, size, log)</literal> — Allocate aligned memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1461 from system heap. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1462 This is a wrapper around <literal>posix_memalign()</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1463 on those platforms that provide that function. |
1899 | 1464 Otherwise implementation falls back to <literal>ngx_alloc()</literal> which |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1465 provides maximum alignment. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1466 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1467 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1468 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1469 <literal>ngx_free(p)</literal> — Free allocated memory. |
1899 | 1470 This is a wrapper around <literal>free()</literal> |
1471 </listitem> | |
1472 | |
1473 </list> | |
1474 </para> | |
1475 | |
1476 </section> | |
1477 | |
1478 | |
1479 <section name="Pool" id="pool"> | |
1480 | |
1481 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1482 Most nginx allocations are done in pools. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1483 Memory allocated in an nginx pool is freed automatically when the pool is |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1484 destroyed. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1485 This provides good allocation performance and makes memory control easy. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1486 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1487 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1488 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1489 A pool internally allocates objects in continuous blocks of memory. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1490 Once a block is full, a new one is allocated and added to the pool memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1491 block list. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1492 When the requested allocation is too large to fit into a block, the request |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1493 is forwarded to the system allocator and the |
1899 | 1494 returned pointer is stored in the pool for further deallocation. |
1495 </para> | |
1496 | |
1497 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1498 The type for nginx pools is <literal>ngx_pool_t</literal>. |
1899 | 1499 The following operations are supported: |
1500 </para> | |
1501 | |
1502 <para> | |
1503 <list type="bullet"> | |
1504 | |
1505 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1506 <literal>ngx_create_pool(size, log)</literal> — Create a pool with specified |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1507 block size. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1508 The pool object returned is allocated in the pool as well. |
2081
f29bd40e9a62
Development guide: documented ngx_create_pool() size requirements.
Ruslan Ermilov <ru@nginx.com>
parents:
2079
diff
changeset
|
1509 The <literal>size</literal> |
f29bd40e9a62
Development guide: documented ngx_create_pool() size requirements.
Ruslan Ermilov <ru@nginx.com>
parents:
2079
diff
changeset
|
1510 should be at least <literal>NGX_MIN_POOL_SIZE</literal> |
f29bd40e9a62
Development guide: documented ngx_create_pool() size requirements.
Ruslan Ermilov <ru@nginx.com>
parents:
2079
diff
changeset
|
1511 and a multiple of <literal>NGX_POOL_ALIGNMENT</literal>. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1512 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1513 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1514 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1515 <literal>ngx_destroy_pool(pool)</literal> — Free all pool memory, including |
1899 | 1516 the pool object itself. |
1517 </listitem> | |
1518 | |
1519 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1520 <literal>ngx_palloc(pool, size)</literal> — Allocate aligned memory from the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1521 specified pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1522 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1523 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1524 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1525 <literal>ngx_pcalloc(pool, size)</literal> — Allocate aligned memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1526 from the specified pool and fill it with zeroes. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1527 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1528 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1529 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1530 <literal>ngx_pnalloc(pool, size)</literal> — Allocate unaligned memory from the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1531 specified pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1532 Mostly used for allocating strings. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1533 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1534 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1535 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1536 <literal>ngx_pfree(pool, p)</literal> — Free memory that was previously |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1537 allocated in the specified pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1538 Only allocations that result from requests forwarded to the system allocator |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1539 can be freed. |
1899 | 1540 </listitem> |
1541 | |
1542 </list> | |
1543 </para> | |
1544 | |
1545 <programlisting> | |
1546 u_char *p; | |
1547 ngx_str_t *s; | |
1548 ngx_pool_t *pool; | |
1549 | |
1550 pool = ngx_create_pool(1024, log); | |
1551 if (pool == NULL) { /* error */ } | |
1552 | |
1553 s = ngx_palloc(pool, sizeof(ngx_str_t)); | |
1554 if (s == NULL) { /* error */ } | |
1936
8f996938fe23
Style: proper quotes usage.
Vladimir Homutov <vl@nginx.com>
parents:
1935
diff
changeset
|
1555 ngx_str_set(s, "foo"); |
1899 | 1556 |
1557 p = ngx_pnalloc(pool, 3); | |
1558 if (p == NULL) { /* error */ } | |
1936
8f996938fe23
Style: proper quotes usage.
Vladimir Homutov <vl@nginx.com>
parents:
1935
diff
changeset
|
1559 ngx_memcpy(p, "foo", 3); |
1899 | 1560 </programlisting> |
1561 | |
1562 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1563 Chain links (<literal>ngx_chain_t</literal>) are actively used in nginx, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1564 so the nginx pool implementation provides a way to reuse them. |
1899 | 1565 The <literal>chain</literal> field of <literal>ngx_pool_t</literal> keeps a |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1566 list of previously allocated links ready for reuse. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1567 For efficient allocation of a chain link in a pool, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1568 <literal>ngx_alloc_chain_link(pool)</literal> function. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1569 This function looks up a free chain link in the pool list and allocates a new |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1570 chain link if the pool list is empty. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1571 To free a link, call the <literal>ngx_free_chain(pool, cl)</literal> function. |
1899 | 1572 </para> |
1573 | |
1574 <para> | |
1575 Cleanup handlers can be registered in a pool. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1576 A cleanup handler is a callback with an argument which is called when pool is |
1899 | 1577 destroyed. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1578 A pool is usually tied to a specific nginx object (like an HTTP request) and is |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1579 destroyed when the object reaches the end of its lifetime. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1580 Registering a pool cleanup is a convenient way to release resources, close |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1581 file descriptors or make final adjustments to the shared data associated with |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1582 the main object. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1583 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1584 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1585 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1586 To register a pool cleanup, call |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1587 <literal>ngx_pool_cleanup_add(pool, size)</literal>, which returns a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1588 <literal>ngx_pool_cleanup_t</literal> pointer to |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1589 be filled in by the caller. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1590 Use the <literal>size</literal> argument to allocate context for the cleanup |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1591 handler. |
1899 | 1592 </para> |
1593 | |
1594 | |
1595 <programlisting> | |
1596 ngx_pool_cleanup_t *cln; | |
1597 | |
1598 cln = ngx_pool_cleanup_add(pool, 0); | |
1599 if (cln == NULL) { /* error */ } | |
1600 | |
1601 cln->handler = ngx_my_cleanup; | |
1936
8f996938fe23
Style: proper quotes usage.
Vladimir Homutov <vl@nginx.com>
parents:
1935
diff
changeset
|
1602 cln->data = "foo"; |
1899 | 1603 |
1604 ... | |
1605 | |
1606 static void | |
1607 ngx_my_cleanup(void *data) | |
1608 { | |
1609 u_char *msg = data; | |
1610 | |
1611 ngx_do_smth(msg); | |
1612 } | |
1613 </programlisting> | |
1614 | |
1615 </section> | |
1616 | |
1617 | |
1618 <section name="Shared memory" id="shared_memory"> | |
1619 | |
1620 <para> | |
1621 Shared memory is used by nginx to share common data between processes. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1622 The <literal>ngx_shared_memory_add(cf, name, size, tag)</literal> function adds |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1623 a new shared memory entry <literal>ngx_shm_zone_t</literal> to a cycle. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1624 The function receives the <literal>name</literal> and <literal>size</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1625 of the zone. |
1899 | 1626 Each shared zone must have a unique name. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1627 If a shared zone entry with the provided <literal>name</literal> and |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1628 <literal>tag</literal> already exists, the existing zone entry is reused. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1629 The function fails with an error if an existing entry with the same name has a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1630 different tag. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1631 Usually, the address of the module structure is passed as |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1632 <literal>tag</literal>, making it possible to reuse shared zones by name within |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1633 one nginx module. |
1899 | 1634 </para> |
1635 | |
1636 <para> | |
1637 The shared memory entry structure <literal>ngx_shm_zone_t</literal> has the | |
1638 following fields: | |
1639 </para> | |
1640 | |
1641 <para> | |
1642 <list type="bullet"> | |
1643 | |
1644 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1645 <literal>init</literal> — Initialization callback, called after the shared zone |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1646 is mapped to actual memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1647 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1648 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1649 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1650 <literal>data</literal> — Data context, used to pass arbitrary data to the |
1899 | 1651 <literal>init</literal> callback |
1652 </listitem> | |
1653 | |
1654 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1655 <literal>noreuse</literal> — Flag that disables reuse of a shared zone from the |
1899 | 1656 old cycle |
1657 </listitem> | |
1658 | |
1659 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1660 <literal>tag</literal> — Shared zone tag |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1661 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1662 |
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|
1663 <listitem> |
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|
1664 <literal>shm</literal> — Platform-specific object of type |
1899 | 1665 <literal>ngx_shm_t</literal>, having at least the following fields: |
1666 <list type="bullet"> | |
1667 | |
1668 <listitem> | |
1993
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|
1669 <literal>addr</literal> — Mapped shared memory address, initially NULL |
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|
1670 </listitem> |
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|
1671 |
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|
1672 <listitem> |
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|
1673 <literal>size</literal> — Shared memory size |
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1674 </listitem> |
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|
1675 |
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1676 <listitem> |
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|
1677 <literal>name</literal> — Shared memory name |
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|
1678 </listitem> |
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|
1679 |
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1680 <listitem> |
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|
1681 <literal>log</literal> — Shared memory log |
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|
1682 </listitem> |
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|
1683 |
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|
1684 <listitem> |
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|
1685 <literal>exists</literal> — Flag that indicates shared memory was inherited |
1899 | 1686 from the master process (Windows-specific) |
1687 </listitem> | |
1688 | |
1689 </list> | |
1690 </listitem> | |
1691 | |
1692 </list> | |
1693 </para> | |
1694 | |
1695 <para> | |
1696 Shared zone entries are mapped to actual memory in | |
1993
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1697 <literal>ngx_init_cycle()</literal> after the configuration is parsed. |
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1698 On POSIX systems, the <literal>mmap()</literal> syscall is used to create the |
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1699 shared anonymous mapping. |
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|
1700 On Windows, the <literal>CreateFileMapping()</literal>/ |
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1701 <literal>MapViewOfFileEx()</literal> pair is used. |
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1702 </para> |
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1703 |
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1704 <para> |
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1705 For allocating in shared memory, nginx provides the slab pool |
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1706 <literal>ngx_slab_pool_t</literal> type. |
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1707 A slab pool for allocating memory is automatically created in each nginx shared |
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1708 zone. |
1899 | 1709 The pool is located in the beginning of the shared zone and can be accessed by |
1710 the expression <literal>(ngx_slab_pool_t *) shm_zone->shm.addr</literal>. | |
1993
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1711 To allocate memory in a shared zone, call either |
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1712 <literal>ngx_slab_alloc(pool, size)</literal> or |
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1713 <literal>ngx_slab_calloc(pool, size)</literal>. |
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1714 To free memory, call <literal>ngx_slab_free(pool, p)</literal>. |
1899 | 1715 </para> |
1716 | |
1717 <para> | |
1718 Slab pool divides all shared zone into pages. | |
1719 Each page is used for allocating objects of the same size. | |
1993
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1720 The specified size must be a power of 2, and greater than the minimum size of |
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1721 8 bytes. |
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1722 Nonconforming values are rounded up. |
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1723 A bitmask for each page tracks which blocks are in use and which are free for |
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1724 allocation. |
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1725 For sizes greater than a half page (which is usually 2048 bytes), allocation is |
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1726 done an entire page at a time |
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1727 </para> |
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1728 |
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1729 <para> |
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|
1730 To protect data in shared memory from concurrent access, use the mutex |
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|
1731 available in the <literal>mutex</literal> field of |
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|
1732 <literal>ngx_slab_pool_t</literal>. |
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1733 A mutex is most commonly used by the slab pool while allocating and freeing |
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|
1734 memory, but it can be used to protect any other user data structures allocated |
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|
1735 in the shared zone. |
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|
1736 To lock or unlock a mutex, call |
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1737 <literal>ngx_shmtx_lock(&shpool->mutex)</literal> or |
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1738 <literal>ngx_shmtx_unlock(&shpool->mutex)</literal> respectively. |
1899 | 1739 </para> |
1740 | |
1741 | |
1742 <programlisting> | |
1743 ngx_str_t name; | |
1744 ngx_foo_ctx_t *ctx; | |
1745 ngx_shm_zone_t *shm_zone; | |
1746 | |
1747 ngx_str_set(&name, "foo"); | |
1748 | |
1749 /* allocate shared zone context */ | |
1750 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_foo_ctx_t)); | |
1751 if (ctx == NULL) { | |
1752 /* error */ | |
1753 } | |
1754 | |
1993
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1755 /* add an entry for 64k shared zone */ |
1899 | 1756 shm_zone = ngx_shared_memory_add(cf, &name, 65536, &ngx_foo_module); |
1757 if (shm_zone == NULL) { | |
1758 /* error */ | |
1759 } | |
1760 | |
1761 /* register init callback and context */ | |
1762 shm_zone->init = ngx_foo_init_zone; | |
1763 shm_zone->data = ctx; | |
1764 | |
1765 | |
1766 ... | |
1767 | |
1768 | |
1769 static ngx_int_t | |
1770 ngx_foo_init_zone(ngx_shm_zone_t *shm_zone, void *data) | |
1771 { | |
1772 ngx_foo_ctx_t *octx = data; | |
1773 | |
1774 size_t len; | |
1775 ngx_foo_ctx_t *ctx; | |
1776 ngx_slab_pool_t *shpool; | |
1777 | |
1778 value = shm_zone->data; | |
1779 | |
1780 if (octx) { | |
1781 /* reusing a shared zone from old cycle */ | |
1782 ctx->value = octx->value; | |
1783 return NGX_OK; | |
1784 } | |
1785 | |
1786 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; | |
1787 | |
1788 if (shm_zone->shm.exists) { | |
1789 /* initialize shared zone context in Windows nginx worker */ | |
1790 ctx->value = shpool->data; | |
1791 return NGX_OK; | |
1792 } | |
1793 | |
1794 /* initialize shared zone */ | |
1795 | |
1796 ctx->value = ngx_slab_alloc(shpool, sizeof(ngx_uint_t)); | |
1797 if (ctx->value == NULL) { | |
1798 return NGX_ERROR; | |
1799 } | |
1800 | |
1801 shpool->data = ctx->value; | |
1802 | |
1803 return NGX_OK; | |
1804 } | |
1805 </programlisting> | |
1806 | |
1807 </section> | |
1808 | |
1809 | |
1810 </section> | |
1811 | |
1812 | |
1813 <section name="Logging" id="logging"> | |
1814 | |
1815 <para> | |
1993
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1816 For logging nginx uses <literal>ngx_log_t</literal> objects. |
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1817 The nginx logger supports several types of output: |
1899 | 1818 |
1819 <list type="bullet"> | |
1820 | |
1821 <listitem> | |
1993
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1822 stderr — Logging to standard error (stderr) |
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1823 </listitem> |
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1824 |
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1825 <listitem> |
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1826 file — Logging to a file |
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1827 </listitem> |
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1828 |
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1829 <listitem> |
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1830 syslog — Logging to syslog |
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1831 </listitem> |
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1832 |
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1833 <listitem> |
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1834 memory — Logging to internal memory storage for development purposes; the memory |
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1835 can be accessed later with a debugger |
1899 | 1836 </listitem> |
1837 | |
1838 </list> | |
1839 </para> | |
1840 | |
1841 <para> | |
1993
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1842 A logger instance can be a chain of loggers, linked to each other with |
1899 | 1843 the <literal>next</literal> field. |
1993
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1844 In this case, each message is written to all loggers in the chain. |
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1845 </para> |
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1846 |
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1847 <para> |
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1848 For each logger, a severity level controls which messages are written to the |
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1849 log (only events assigned that level or higher are logged). |
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1850 The following severity levels are supported: |
1899 | 1851 </para> |
1852 | |
1853 <para> | |
1854 <list type="bullet"> | |
1855 | |
1856 <listitem> | |
1857 <literal>NGX_LOG_EMERG</literal> | |
1858 </listitem> | |
1859 | |
1860 <listitem> | |
1861 <literal>NGX_LOG_ALERT</literal> | |
1862 </listitem> | |
1863 | |
1864 <listitem> | |
1865 <literal>NGX_LOG_CRIT</literal> | |
1866 </listitem> | |
1867 | |
1868 <listitem> | |
1869 <literal>NGX_LOG_ERR</literal> | |
1870 </listitem> | |
1871 | |
1872 <listitem> | |
1873 <literal>NGX_LOG_WARN</literal> | |
1874 </listitem> | |
1875 | |
1876 <listitem> | |
1877 <literal>NGX_LOG_NOTICE</literal> | |
1878 </listitem> | |
1879 | |
1880 <listitem> | |
1881 <literal>NGX_LOG_INFO</literal> | |
1882 </listitem> | |
1883 | |
1884 <listitem> | |
1885 <literal>NGX_LOG_DEBUG</literal> | |
1886 </listitem> | |
1887 | |
1888 </list> | |
1889 </para> | |
1890 | |
1891 <para> | |
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1892 For debug logging, the debug mask is checked as well. |
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1893 The debug masks are: |
1899 | 1894 </para> |
1895 | |
1896 <para> | |
1897 <list type="bullet"> | |
1898 | |
1899 <listitem> | |
1900 <literal>NGX_LOG_DEBUG_CORE</literal> | |
1901 </listitem> | |
1902 | |
1903 <listitem> | |
1904 <literal>NGX_LOG_DEBUG_ALLOC</literal> | |
1905 </listitem> | |
1906 | |
1907 <listitem> | |
1908 <literal>NGX_LOG_DEBUG_MUTEX</literal> | |
1909 </listitem> | |
1910 | |
1911 <listitem> | |
1912 <literal>NGX_LOG_DEBUG_EVENT</literal> | |
1913 </listitem> | |
1914 | |
1915 <listitem> | |
1916 <literal>NGX_LOG_DEBUG_HTTP</literal> | |
1917 </listitem> | |
1918 | |
1919 <listitem> | |
1920 <literal>NGX_LOG_DEBUG_MAIL</literal> | |
1921 </listitem> | |
1922 | |
1923 <listitem> | |
1924 <literal>NGX_LOG_DEBUG_STREAM</literal> | |
1925 </listitem> | |
1926 | |
1927 </list> | |
1928 </para> | |
1929 | |
1930 <para> | |
1931 Normally, loggers are created by existing nginx code from | |
1932 <literal>error_log</literal> directives and are available at nearly every stage | |
1933 of processing in cycle, configuration, client connection and other objects. | |
1934 </para> | |
1935 | |
1936 <para> | |
1937 Nginx provides the following logging macros: | |
1938 </para> | |
1939 | |
1940 <para> | |
1941 <list type="bullet"> | |
1942 | |
1943 <listitem> | |
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1944 <literal>ngx_log_error(level, log, err, fmt, ...)</literal> — Error logging |
1899 | 1945 </listitem> |
1946 | |
1947 <listitem> | |
1948 <literal>ngx_log_debug0(level, log, err, fmt)</literal>, | |
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1949 <literal>ngx_log_debug1(level, log, err, fmt, arg1)</literal> etc — Debug |
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1950 logging with up to eight supported formatting arguments |
1899 | 1951 </listitem> |
1952 | |
1953 </list> | |
1954 </para> | |
1955 | |
1956 <para> | |
1957 A log message is formatted in a buffer of size | |
1958 <literal>NGX_MAX_ERROR_STR</literal> (currently, 2048 bytes) on stack. | |
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1959 The message is prepended with the severity level, process ID (PID), connection |
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1960 ID (stored in <literal>log->connection</literal>), and the system error text. |
1899 | 1961 For non-debug messages <literal>log->handler</literal> is called as well to |
1962 prepend more specific information to the log message. | |
1963 HTTP module sets <literal>ngx_http_log_error()</literal> function as log | |
1964 handler to log client and server addresses, current action (stored in | |
1965 <literal>log->action</literal>), client request line, server name etc. | |
1966 </para> | |
1967 | |
1968 <programlisting> | |
1969 /* specify what is currently done */ | |
1970 log->action = "sending mp4 to client”; | |
1971 | |
1972 /* error and debug log */ | |
1973 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client prematurely | |
1974 closed connection”); | |
1975 | |
1976 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, | |
1977 "mp4 start:%ui, length:%ui”, mp4->start, mp4->length); | |
1978 </programlisting> | |
1979 | |
1980 <para> | |
1993
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1981 The example above results in log entries like these: |
1899 | 1982 </para> |
1983 | |
1984 | |
1985 <programlisting> | |
1986 2016/09/16 22:08:52 [info] 17445#0: *1 client prematurely closed connection while | |
1987 sending mp4 to client, client: 127.0.0.1, server: , request: "GET /file.mp4 HTTP/1.1” | |
1988 2016/09/16 23:28:33 [debug] 22140#0: *1 mp4 start:0, length:10000 | |
1989 </programlisting> | |
1990 | |
1991 </section> | |
1992 | |
1993 | |
1994 <section name="Cycle" id="cycle"> | |
1995 | |
1996 <para> | |
1993
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1997 A cycle object stores the nginx runtime context created from a specific |
1899 | 1998 configuration. |
1993
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1999 Its type is <literal>ngx_cycle_t</literal>. |
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2000 The current cycle is referenced by the <literal>ngx_cycle</literal> global |
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2001 variable and inherited by nginx workers as they start. |
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2002 Each time the nginx configuration is reloaded, a new cycle is created from the |
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2003 new nginx configuration; the old cycle is usually deleted after the new one is |
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2004 successfully created. |
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2005 </para> |
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2006 |
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2007 <para> |
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2008 A cycle is created by the <literal>ngx_init_cycle()</literal> function, which |
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2009 takes the previous cycle as its argument. |
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2010 The function locates the previous cycle's configuration file and inherits as |
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2011 many resources as possible from the previous cycle. |
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2012 A placeholder cycle called "init cycle" is created as nginx start, then is |
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|
2013 replaced by an actual cycle built from configuration. |
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|
2014 </para> |
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|
2015 |
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|
2016 <para> |
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2017 Members of the cycle include: |
1899 | 2018 </para> |
2019 | |
2020 <para> | |
2021 <list type="bullet"> | |
2022 | |
2023 <listitem> | |
1993
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2024 <literal>pool</literal> — Cycle pool. |
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2025 Created for each new cycle. |
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|
2026 </listitem> |
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|
2027 |
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|
2028 <listitem> |
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|
2029 <literal>log</literal> — Cycle log. |
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2030 Initially inherited from the old cycle, it is set to point to |
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2031 <literal>new_log</literal> after the configuration is read. |
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|
2032 </listitem> |
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|
2033 |
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|
2034 <listitem> |
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|
2035 <literal>new_log</literal> — Cycle log, created by the configuration. |
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|
2036 It's affected by the root-scope <literal>error_log</literal> directive. |
1899 | 2037 </listitem> |
2038 | |
2039 <listitem> | |
1981
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2040 <literal>connections</literal>, <literal>connection_n</literal> — |
1993
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2041 Array of connections of type <literal>ngx_connection_t</literal>, created by |
1899 | 2042 the event module while initializing each nginx worker. |
1993
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2043 The <literal>worker_connections</literal> directive in the nginx configuration |
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2044 sets the number of connections <literal>connection_n</literal>. |
1899 | 2045 </listitem> |
2046 | |
2047 <listitem> | |
2048 <literal>free_connections</literal>, | |
1993
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|
2049 <literal>free_connection_n</literal> — List and number of currently available |
1899 | 2050 connections. |
1993
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2051 If no connections are available, an nginx worker refuses to accept new clients |
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|
2052 or connect to upstream servers. |
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|
2053 </listitem> |
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|
2054 |
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2055 <listitem> |
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|
2056 <literal>files</literal>, <literal>files_n</literal> — Array for mapping file |
1899 | 2057 descriptors to nginx connections. |
2058 This mapping is used by the event modules, having the | |
1993
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|
2059 <literal>NGX_USE_FD_EVENT</literal> flag (currently, it's |
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|
2060 <literal>poll</literal> and <literal>devpoll</literal>). |
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|
2061 </listitem> |
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|
2062 |
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|
2063 <listitem> |
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|
2064 <literal>conf_ctx</literal> — Array of core module configurations. |
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2065 The configurations are created and filled during reading of nginx configuration |
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2066 files. |
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|
2067 </listitem> |
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|
2068 |
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2069 <listitem> |
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2070 <literal>modules</literal>, <literal>modules_n</literal> — Array of modules |
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2071 of type <literal>ngx_module_t</literal>, both static and dynamic, loaded by |
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2072 the current configuration. |
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|
2073 </listitem> |
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|
2074 |
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|
2075 <listitem> |
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|
2076 <literal>listening</literal> — Array of listening objects of type |
1899 | 2077 <literal>ngx_listening_t</literal>. |
1993
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2078 Listening objects are normally added by the <literal>listen</literal> |
1899 | 2079 directive of different modules which call the |
2080 <literal>ngx_create_listening()</literal> function. | |
1993
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2081 Listen sockets are created based on the listening objects. |
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2082 </listitem> |
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2083 |
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2084 <listitem> |
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2085 <literal>paths</literal> — Array of paths of type <literal>ngx_path_t</literal>. |
1899 | 2086 Paths are added by calling the function <literal>ngx_add_path()</literal> from |
2087 modules which are going to operate on certain directories. | |
2088 These directories are created by nginx after reading configuration, if missing. | |
2089 Moreover, two handlers can be added for each path: | |
2090 | |
2091 <list type="bullet"> | |
2092 | |
2093 <listitem> | |
1993
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2094 path loader — Executes only once in 60 seconds after starting or reloading |
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|
2095 nginx. |
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|
2096 Normally, the loader reads the directory and stores data in nginx shared |
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|
2097 memory. |
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2098 The handler is called from the dedicated nginx process “nginx cache loader”. |
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2099 </listitem> |
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|
2100 |
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2101 <listitem> |
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2102 path manager — Executes periodically. |
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2103 Normally, the manager removes old files from the directory and updates nginx |
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2104 memory to reflect the changes. |
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2105 The handler is called from the dedicated “nginx cache manager” process. |
1899 | 2106 </listitem> |
2107 | |
2108 </list> | |
2109 </listitem> | |
2110 | |
2111 <listitem> | |
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2112 <literal>open_files</literal> — List of open file objects of type |
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2113 <literal>ngx_open_file_t</literal>, which are created by calling the function |
1899 | 2114 <literal>ngx_conf_open_file()</literal>. |
1993
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2115 Currently, nginx uses this kind of open files for logging. |
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2116 After reading the configuration, nginx opens all files in the |
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2117 <literal>open_files</literal> list and stores each file descriptor in the |
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2118 object's <literal>fd</literal> field. |
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2119 The files are opened in append mode and are created if missing. |
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2120 The files in the list are reopened by nginx workers upon receiving the |
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2121 reopen signal (most often <literal>USR1</literal>). |
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2122 In this case the descriptor in the <literal>fd</literal> field is changed to a |
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2123 new value. |
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2124 </listitem> |
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2125 |
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2126 <listitem> |
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2127 <literal>shared_memory</literal> — List of shared memory zones, each added by |
1899 | 2128 calling the <literal>ngx_shared_memory_add()</literal> function. |
2129 Shared zones are mapped to the same address range in all nginx processes and | |
1993
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2130 are used to share common data, for example the HTTP cache in-memory tree. |
1899 | 2131 </listitem> |
2132 | |
2133 </list> | |
2134 </para> | |
2135 | |
2136 </section> | |
2137 | |
2138 <section name="Buffer" id="buffer"> | |
2139 | |
2140 <para> | |
2141 For input/output operations, nginx provides the buffer type | |
2142 <literal>ngx_buf_t</literal>. | |
2143 Normally, it's used to hold data to be written to a destination or read from a | |
2144 source. | |
1993
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2145 A buffer can reference data in memory or in a file and it's technically |
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2146 possible for a buffer to reference both at the same time. |
1899 | 2147 Memory for the buffer is allocated separately and is not related to the buffer |
2148 structure <literal>ngx_buf_t</literal>. | |
2149 </para> | |
2150 | |
2151 <para> | |
1993
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2152 The <literal>ngx_buf_t</literal> structure has the following fields: |
1899 | 2153 </para> |
2154 | |
2155 <para> | |
2156 <list type="bullet"> | |
2157 | |
2158 <listitem> | |
1993
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|
2159 <literal>start</literal>, <literal>end</literal> — The boundaries of the memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2160 block allocated for the buffer. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2161 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2162 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2163 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2164 <literal>pos</literal>, <literal>last</literal> — The boundaries of the memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2165 buffer; normally a subrange of <literal>start</literal> .. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2166 <literal>end</literal>. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2167 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2168 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2169 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2170 <literal>file_pos</literal>, <literal>file_last</literal> — The boundaries of a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2171 file buffer, expressed as offsets from the beginning of the file. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2172 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2173 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2174 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2175 <literal>tag</literal> — Unique value used to distinguish buffers; created by |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2176 different nginx modules, usually for the purpose of buffer reuse. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2177 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2178 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2179 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2180 <literal>file</literal> — File object. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2181 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2182 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2183 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2184 <literal>temporary</literal> — Flag indicating that the buffer references |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2185 writable memory. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2186 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2187 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2188 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2189 <literal>memory</literal> — Flag indicating that the buffer references read-only |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2190 memory. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2191 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2192 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2193 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2194 <literal>in_file</literal> — Flag indicating that the buffer references data |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2195 in a file. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2196 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2197 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2198 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2199 <literal>flush</literal> — Flag indicating that all data prior to the buffer |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2200 need to be flushed. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2201 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2202 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2203 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2204 <literal>recycled</literal> — Flag indicating that the buffer can be reused and |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2205 needs to be consumed as soon as possible. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2206 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2207 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2208 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2209 <literal>sync</literal> — Flag indicating that the buffer carries no data or |
1899 | 2210 special signal like <literal>flush</literal> or <literal>last_buf</literal>. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2211 By default nginx considers such buffers an error condition, but this flag tells |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2212 nginx to skip the error check. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2213 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2214 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2215 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2216 <literal>last_buf</literal> — Flag indicating that the buffer is the last in |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2217 output. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2218 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2219 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2220 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2221 <literal>last_in_chain</literal> — Flag indicating that there are no more data |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2222 buffers in a request or subrequest. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2223 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2224 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2225 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2226 <literal>shadow</literal> — Reference to another ("shadow") buffer related to |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2227 the current buffer, usually in the sense that the buffer uses data from the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2228 shadow. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2229 When the buffer is consumed, the shadow buffer is normally also marked as |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2230 consumed. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2231 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2232 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2233 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2234 <literal>last_shadow</literal> — Flag indicating that the buffer is the last |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2235 one that references a particular shadow buffer. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2236 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2237 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2238 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2239 <literal>temp_file</literal> — Flag indicating that the buffer is in a temporary |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2240 file. |
1899 | 2241 </listitem> |
2242 | |
2243 </list> | |
2244 </para> | |
2245 | |
2246 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2247 For input and output operations buffers are linked in chains. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2248 A chain is a sequence of chain links of type <literal>ngx_chain_t</literal>, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2249 defined as follows: |
1899 | 2250 </para> |
2251 | |
2252 | |
2253 <programlisting> | |
2254 typedef struct ngx_chain_s ngx_chain_t; | |
2255 | |
2256 struct ngx_chain_s { | |
2257 ngx_buf_t *buf; | |
2258 ngx_chain_t *next; | |
2259 }; | |
2260 </programlisting> | |
2261 | |
2262 <para> | |
2263 Each chain link keeps a reference to its buffer and a reference to the next | |
2264 chain link. | |
2265 </para> | |
2266 | |
2267 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2268 An example of using buffers and chains: |
1899 | 2269 </para> |
2270 | |
2271 | |
2272 <programlisting> | |
2273 ngx_chain_t * | |
2274 ngx_get_my_chain(ngx_pool_t *pool) | |
2275 { | |
2276 ngx_buf_t *b; | |
2277 ngx_chain_t *out, *cl, **ll; | |
2278 | |
2279 /* first buf */ | |
2280 cl = ngx_alloc_chain_link(pool); | |
2281 if (cl == NULL) { /* error */ } | |
2282 | |
2283 b = ngx_calloc_buf(pool); | |
2284 if (b == NULL) { /* error */ } | |
2285 | |
2286 b->start = (u_char *) "foo"; | |
2287 b->pos = b->start; | |
2288 b->end = b->start + 3; | |
2289 b->last = b->end; | |
2290 b->memory = 1; /* read-only memory */ | |
2291 | |
2292 cl->buf = b; | |
2293 out = cl; | |
2294 ll = &cl->next; | |
2295 | |
2296 /* second buf */ | |
2297 cl = ngx_alloc_chain_link(pool); | |
2298 if (cl == NULL) { /* error */ } | |
2299 | |
2300 b = ngx_create_temp_buf(pool, 3); | |
2301 if (b == NULL) { /* error */ } | |
2302 | |
2303 b->last = ngx_cpymem(b->last, "foo", 3); | |
2304 | |
2305 cl->buf = b; | |
2306 cl->next = NULL; | |
2307 *ll = cl; | |
2308 | |
2309 return out; | |
2310 } | |
2311 </programlisting> | |
2312 | |
2313 </section> | |
2314 | |
2315 | |
2316 <section name="Networking" id="networking"> | |
2317 | |
2318 | |
2319 <!-- | |
2320 <section name="Network data types" id="network_data_types"> | |
2321 | |
2322 <para> | |
2323 TBD: ngx_addr_t, ngx_url_t, ngx_socket_t, ngx_sockaddr_t, parse url, parse | |
2324 address... | |
2325 </para> | |
2326 | |
2327 </section> | |
2328 --> | |
2329 | |
2330 <section name="Connection" id="connection"> | |
2331 | |
2332 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2333 The connection type <literal>ngx_connection_t</literal> is a wrapper around a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2334 socket descriptor. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2335 It includes the following fields: |
1899 | 2336 </para> |
2337 | |
2338 <para> | |
2339 <list type="bullet"> | |
2340 | |
2341 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2342 <literal>fd</literal> — Socket descriptor |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2343 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2344 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2345 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2346 <literal>data</literal> — Arbitrary connection context. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2347 Normally, it is a pointer to a higher-level object built on top of the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2348 connection, such as an HTTP request or a Stream session. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2349 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2350 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2351 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2352 <literal>read</literal>, <literal>write</literal> — Read and write events for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2353 the connection. |
1899 | 2354 </listitem> |
2355 | |
2356 <listitem> | |
2357 <literal>recv</literal>, <literal>send</literal>, | |
1935
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
2358 <literal>recv_chain</literal>, <literal>send_chain</literal> — I/O operations |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2359 for the connection. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2360 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2361 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2362 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2363 <literal>pool</literal> — Connection pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2364 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2365 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2366 <listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2367 <literal>log</literal> — Connection log. |
1899 | 2368 </listitem> |
2369 | |
2370 <listitem> | |
2371 <literal>sockaddr</literal>, <literal>socklen</literal>, | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2372 <literal>addr_text</literal> — Remote socket address in binary and text forms. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2373 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2374 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2375 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2376 <literal>local_sockaddr</literal>, <literal>local_socklen</literal> — Local |
1899 | 2377 socket address in binary form. |
2378 Initially, these fields are empty. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2379 Use the <literal>ngx_connection_local_sockaddr()</literal> function to get the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2380 local socket address. |
1899 | 2381 </listitem> |
2382 | |
2383 <listitem> | |
2384 <literal>proxy_protocol_addr</literal>, <literal>proxy_protocol_port</literal> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2385 - PROXY protocol client address and port, if the PROXY protocol is enabled for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2386 the connection. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2387 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2388 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2389 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2390 <literal>ssl</literal> — SSL context for the connection. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2391 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2392 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2393 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2394 <literal>reusable</literal> — Flag indicating the connection is in a state that |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2395 makes it eligible for reuse. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2396 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2397 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2398 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2399 <literal>close</literal> — Flag indicating that the connection is being reused |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2400 and needs to be closed. |
1899 | 2401 </listitem> |
2402 | |
2403 </list> | |
2404 </para> | |
2405 | |
2406 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2407 An nginx connection can transparently encapsulate the SSL layer. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2408 In this case the connection's <literal>ssl</literal> field holds a pointer to an |
1899 | 2409 <literal>ngx_ssl_connection_t</literal> structure, keeping all SSL-related data |
2410 for the connection, including <literal>SSL_CTX</literal> and | |
2411 <literal>SSL</literal>. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2412 The <literal>recv</literal>, <literal>send</literal>, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2413 <literal>recv_chain</literal>, and <literal>send_chain</literal> handlers are |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2414 set to SSL-enabled functions as well. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2415 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2416 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2417 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2418 The <literal>worker_connections</literal> directive in the nginx configuration |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2419 limits the number of connections per nginx worker. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2420 All connection structures are precreated when a worker starts and stored in |
1899 | 2421 the <literal>connections</literal> field of the cycle object. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2422 To retrieve a connection structure, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2423 <literal>ngx_get_connection(s, log)</literal> function. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2424 It takes as its <literal>s</literal> argument a socket descriptor, which needs |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2425 to be wrapped in a connection structure. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2426 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2427 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2428 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2429 Because the number of connections per worker is limited, nginx provides a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2430 way to grab connections that are currently in use. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2431 To enable or disable reuse of a connection, call the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2432 <literal>ngx_reusable_connection(c, reusable)</literal> function. |
1899 | 2433 Calling <literal>ngx_reusable_connection(c, 1)</literal> sets the |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2434 <literal>reuse</literal> flag in the connection structure and inserts the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2435 connection into the <literal>reusable_connections_queue</literal> of the cycle. |
1899 | 2436 Whenever <literal>ngx_get_connection()</literal> finds out there are no |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2437 available connections in the cycle's <literal>free_connections</literal> list, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2438 it calls <literal>ngx_drain_connections()</literal> to release a |
1899 | 2439 specific number of reusable connections. |
2440 For each such connection, the <literal>close</literal> flag is set and its read | |
2441 handler is called which is supposed to free the connection by calling | |
2442 <literal>ngx_close_connection(c)</literal> and make it available for reuse. | |
2443 To exit the state when a connection can be reused | |
2444 <literal>ngx_reusable_connection(c, 0)</literal> is called. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2445 HTTP client connections are an example of reusable connections in nginx; they |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2446 are marked as reusable until the first request byte is received from the client. |
1899 | 2447 </para> |
2448 | |
2449 </section> | |
2450 | |
2451 | |
2452 </section> | |
2453 | |
2454 | |
2455 <section name="Events" id="events"> | |
2456 | |
2457 | |
2458 <section name="Event" id="event"> | |
2459 | |
2460 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2461 Event object <literal>ngx_event_t</literal> in nginx provides a mechanism |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2462 for notification that a specific event has occurred. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2463 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2464 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2465 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2466 Fields in <literal>ngx_event_t</literal> include: |
1899 | 2467 </para> |
2468 | |
2469 <para> | |
2470 <list type="bullet"> | |
2471 | |
2472 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2473 <literal>data</literal> — Arbitrary event context used in event handlers, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2474 usually as pointer to a connection related to the event. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2475 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2476 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2477 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2478 <literal>handler</literal> — Callback function to be invoked when the event |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2479 happens. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2480 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2481 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2482 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2483 <literal>write</literal> — Flag indicating a write event. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2484 Absence of the flag indicates a read event. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2485 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2486 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2487 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2488 <literal>active</literal> — Flag indicating that the event is registered for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2489 receiving I/O notifications, normally from notification mechanisms like |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2490 <literal>epoll</literal>, <literal>kqueue</literal>, <literal>poll</literal>. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2491 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2492 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2493 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2494 <literal>ready</literal> — Flag indicating that the event has received an |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2495 I/O notification. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2496 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2497 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2498 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2499 <literal>delayed</literal> — Flag indicating that I/O is delayed due to rate |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2500 limiting. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2501 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2502 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2503 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2504 <literal>timer</literal> — Red-black tree node for inserting the event into |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2505 the timer tree. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2506 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2507 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2508 <listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2509 <literal>timer_set</literal> — Flag indicating that the event timer is set and |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2510 not yet expired. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2511 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2512 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2513 <listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2514 <literal>timedout</literal> — Flag indicating that the event timer has expired. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2515 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2516 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2517 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2518 <literal>eof</literal> — Flag indicating that EOF occurred while reading data. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2519 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2520 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2521 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2522 <literal>pending_eof</literal> — Flag indicating that EOF is pending on the |
1899 | 2523 socket, even though there may be some data available before it. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
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1983
diff
changeset
|
2524 The flag is delivered via the <literal>EPOLLRDHUP</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2525 <literal>epoll</literal> event or |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2526 <literal>EV_EOF</literal> <literal>kqueue</literal> flag. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2527 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
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|
2528 |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
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diff
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|
2529 <listitem> |
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Language and style fixes in development guide.
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parents:
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diff
changeset
|
2530 <literal>error</literal> — Flag indicating that an error occurred during |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
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|
2531 reading (for a read event) or writing (for a write event). |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2532 </listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2533 |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2534 <listitem> |
1995
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2535 <literal>cancelable</literal> — Timer event flag indicating that the event |
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2536 should be ignored while shutting down the worker. |
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2537 Graceful worker shutdown is delayed until there are no non-cancelable timer |
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2538 events scheduled. |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2539 </listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2540 |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
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1983
diff
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|
2541 <listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2542 <literal>posted</literal> — Flag indicating that the event is posted to a queue. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2543 </listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2544 |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
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diff
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|
2545 <listitem> |
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Language and style fixes in development guide.
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parents:
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diff
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|
2546 <literal>queue</literal> — Queue node for posting the event to a queue. |
1899 | 2547 </listitem> |
2548 | |
2549 </list> | |
2550 </para> | |
2551 | |
2552 </section> | |
2553 | |
2554 | |
2555 <section name="I/O events" id="i_o_events"> | |
2556 | |
2557 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2558 Each connection obtained by calling the <literal>ngx_get_connection()</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2559 function has two attached events, <literal>c->read</literal> and |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2560 <literal>c->write</literal>, which are used for receiving notification that the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2561 socket is ready for reading or writing. |
1899 | 2562 All such events operate in Edge-Triggered mode, meaning that they only trigger |
2563 notifications when the state of the socket changes. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2564 For example, doing a partial read on a socket does not make nginx deliver a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2565 repeated read notification until more data arrives on the socket. |
1899 | 2566 Even when the underlying I/O notification mechanism is essentially |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2567 Level-Triggered (<literal>poll</literal>, <literal>select</literal> etc), nginx |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2568 converts the notifications to Edge-Triggered. |
1899 | 2569 To make nginx event notifications consistent across all notifications systems |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2570 on different platforms, the functions |
1899 | 2571 <literal>ngx_handle_read_event(rev, flags)</literal> and |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2572 <literal>ngx_handle_write_event(wev, lowat)</literal> must be called after |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2573 handling an I/O socket notification or calling any I/O functions on that socket. |
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Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
2574 Normally, the functions are called once at the end of each read or write |
1899 | 2575 event handler. |
2576 </para> | |
2577 | |
2578 </section> | |
2579 | |
2580 | |
2581 <section name="Timer events" id="timer_events"> | |
2582 | |
2583 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2584 An event can be set to send a notification when a timeout expires. |
1899 | 2585 The function <literal>ngx_add_timer(ev, timer)</literal> sets a timeout for an |
2586 event, <literal>ngx_del_timer(ev)</literal> deletes a previously set timeout. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2587 The global timeout red-black tree <literal>ngx_event_timer_rbtree</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2588 stores all timeouts currently set. |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
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|
2589 The key in the tree is of type <literal>ngx_msec_t</literal> and is the time |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2590 when the event expires, expressed in milliseconds since the midnight on of |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2591 January 1, 1970 modulus <literal>ngx_msec_t</literal> max value. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2592 The tree structure enables fast insertion and deletion operations, as well as |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2593 access to the nearest timeouts, which nginx uses to find out how long to wait |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2594 for I/O events and for expiring timeout events. |
1899 | 2595 </para> |
2596 | |
2597 </section> | |
2598 | |
2599 | |
2600 <section name="Posted events" id="posted_events"> | |
2601 | |
2602 <para> | |
2603 An event can be posted which means that its handler will be called at some | |
2604 point later within the current event loop iteration. | |
2605 Posting events is a good practice for simplifying code and escaping stack | |
2606 overflows. | |
2607 Posted events are held in a post queue. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2608 The <literal>ngx_post_event(ev, q)</literal> mscro posts the event |
1899 | 2609 <literal>ev</literal> to the post queue <literal>q</literal>. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2610 The <literal>ngx_delete_posted_event(ev)</literal> macro deletes the event |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2611 <literal>ev</literal> from the queue it's currently posted in. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2612 Normally, events are posted to the <literal>ngx_posted_events</literal> queue, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2613 which is processed late in the event loop — after all I/O and timer |
1899 | 2614 events are already handled. |
2615 The function <literal>ngx_event_process_posted()</literal> is called to process | |
2616 an event queue. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2617 It calls event handlers until the queue is not empty. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2618 This means that a posted event handler can post more events to be processed |
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Language and style fixes in development guide.
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parents:
1983
diff
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|
2619 within the current event loop iteration. |
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parents:
1983
diff
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|
2620 </para> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2621 |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2622 <para> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2623 An example: |
1899 | 2624 </para> |
2625 | |
2626 | |
2627 <programlisting> | |
2628 void | |
2629 ngx_my_connection_read(ngx_connection_t *c) | |
2630 { | |
2631 ngx_event_t *rev; | |
2632 | |
2633 rev = c->read; | |
2634 | |
2635 ngx_add_timer(rev, 1000); | |
2636 | |
2637 rev->handler = ngx_my_read_handler; | |
2638 | |
2639 ngx_my_read(rev); | |
2640 } | |
2641 | |
2642 | |
2643 void | |
2644 ngx_my_read_handler(ngx_event_t *rev) | |
2645 { | |
2646 ssize_t n; | |
2647 ngx_connection_t *c; | |
2648 u_char buf[256]; | |
2649 | |
2650 if (rev->timedout) { /* timeout expired */ } | |
2651 | |
2652 c = rev->data; | |
2653 | |
2654 while (rev->ready) { | |
2655 n = c->recv(c, buf, sizeof(buf)); | |
2656 | |
2657 if (n == NGX_AGAIN) { | |
2658 break; | |
2659 } | |
2660 | |
2661 if (n == NGX_ERROR) { /* error */ } | |
2662 | |
2663 /* process buf */ | |
2664 } | |
2665 | |
2666 if (ngx_handle_read_event(rev, 0) != NGX_OK) { /* error */ } | |
2667 } | |
2668 </programlisting> | |
2669 | |
2670 </section> | |
2671 | |
2672 | |
2673 <section name="Event loop" id="event_loop"> | |
2674 | |
2675 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2676 Except for the nginx master process, all nginx processes do I/O and so have an |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2677 event loop. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2678 (The nginx master process instead spends most of its time in the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2679 <literal>sigsuspend()</literal> call waiting for signals to arrive.) |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2680 The nginx event loop is implemented in the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2681 <literal>ngx_process_events_and_timers()</literal> function, which is called |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2682 repeatedly until the process exits. |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2683 </para> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
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diff
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|
2684 |
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diff
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|
2685 <para> |
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Language and style fixes in development guide.
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parents:
1983
diff
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|
2686 The event loop has the following stages: |
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parents:
1983
diff
changeset
|
2687 |
1899 | 2688 <list type="bullet"> |
2689 | |
2690 <listitem> | |
1993
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Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2691 Find the timeout that is closest to expiring, by calling |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2692 <literal>ngx_event_find_timer()</literal>. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2693 This function finds the leftmost node in the timer tree and returns the |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2694 number of milliseconds until the node expires. |
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diff
changeset
|
2695 </listitem> |
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diff
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|
2696 |
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Language and style fixes in development guide.
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|
2697 <listitem> |
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|
2698 Process I/O events by calling a handler, specific to the event notification |
1899 | 2699 mechanism, chosen by nginx configuration. |
1993
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1983
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|
2700 This handler waits for at least one I/O event to happen, but only until the next |
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|
2701 timeout expires. |
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Language and style fixes in development guide.
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diff
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|
2702 When a read or write event occurs, the <literal>ready</literal> |
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Language and style fixes in development guide.
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|
2703 flag is set and the event's handler is called. |
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1983
diff
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|
2704 For Linux, the <literal>ngx_epoll_process_events()</literal> handler |
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parents:
1983
diff
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|
2705 is normally used, which calls <literal>epoll_wait()</literal> to wait for I/O |
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|
2706 events. |
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|
2707 </listitem> |
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Language and style fixes in development guide.
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|
2708 |
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|
2709 <listitem> |
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|
2710 Expire timers by calling <literal>ngx_event_expire_timers()</literal>. |
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|
2711 The timer tree is iterated from the leftmost element to the right until an |
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diff
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|
2712 unexpired timeout is found. |
1899 | 2713 For each expired node the <literal>timedout</literal> event flag is set, |
1993
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|
2714 the <literal>timer_set</literal> flag is reset, and the event handler is called |
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|
2715 </listitem> |
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|
2716 |
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|
2717 <listitem> |
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|
2718 Process posted events by calling <literal>ngx_event_process_posted()</literal>. |
1899 | 2719 The function repeatedly removes the first element from the posted events |
1993
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|
2720 queue and calls the element's handler, until the queue is empty. |
1899 | 2721 </listitem> |
2722 | |
2723 </list> | |
2724 </para> | |
2725 | |
2726 <para> | |
2727 All nginx processes handle signals as well. | |
2728 Signal handlers only set global variables which are checked after the | |
2729 <literal>ngx_process_events_and_timers()</literal> call. | |
2730 </para> | |
2731 | |
2732 </section> | |
2733 | |
2734 | |
2735 </section> | |
2736 | |
2737 | |
2738 <section name="Processes" id="processes"> | |
2739 | |
2740 <para> | |
2741 There are several types of processes in nginx. | |
2007
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diff
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|
2742 The type of a process is kept in the <literal>ngx_process</literal> |
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diff
changeset
|
2743 global variable, and is one of the following: |
1899 | 2744 </para> |
2745 | |
2746 <list type="bullet"> | |
2747 | |
2748 <listitem> | |
2749 | |
2750 <para> | |
2007
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diff
changeset
|
2751 <literal>NGX_PROCESS_MASTER</literal> — The master process, which reads the |
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parents:
1999
diff
changeset
|
2752 NGINX configuration, creates cycles, and starts and controls child processes. |
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diff
changeset
|
2753 It does not perform any I/O and responds only to signals. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2754 Its cycle function is <literal>ngx_master_process_cycle()</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2755 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2756 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2757 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2758 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2759 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2760 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2761 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2762 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2763 <literal>NGX_PROCESS_WORKER</literal> — The worker process, which handles client |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2764 connections. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2765 It is started by the master process and responds to its signals and channel |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2766 commands as well. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2767 Its cycle function is <literal>ngx_worker_process_cycle()</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2768 There can be multiple worker processes, as configured by the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2769 <literal>worker_processes</literal> directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2770 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2771 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2772 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2773 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2774 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2775 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2776 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2777 <literal>NGX_PROCESS_SINGLE</literal> — The single process, which exists only in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2778 <literal>master_process off</literal> mode, and is the only process running in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2779 that mode. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2780 It creates cycles (like the master process does) and handles client connections |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2781 (like the worker process does). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2782 Its cycle function is <literal>ngx_single_process_cycle()</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2783 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2784 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2785 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2786 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2787 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2788 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2789 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2790 <literal>NGX_PROCESS_HELPER</literal> — The helper process, of which currently |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2791 there are two types: cache manager and cache loader. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2792 The cycle function for both is |
1899 | 2793 <literal>ngx_cache_manager_process_cycle()</literal>. |
2794 </para> | |
2795 | |
2796 </listitem> | |
2797 | |
2798 </list> | |
2799 | |
2800 <para> | |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2801 The nginx processes handle the following signals: |
1899 | 2802 </para> |
2803 | |
2804 <list type="bullet"> | |
2805 | |
2806 <listitem> | |
2807 | |
2808 <para> | |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2809 <literal>NGX_SHUTDOWN_SIGNAL</literal> (<literal>SIGQUIT</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2810 systems) — Gracefully shutdown. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2811 Upon receiving this signal, the master process sends a shutdown signal to all |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2812 child processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2813 When no child processes are left, the master destroys the cycle pool and exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2814 When a worker process receives this signal, it closes all listening sockets and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2815 waits until there are no non-cancelable events scheduled, then destroys the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2816 cycle pool and exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2817 When the cache manager or the cache loader process receives this signal, it |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2818 exits immediately. |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2819 The <literal>ngx_quit</literal> variable is set to <literal>1</literal> when a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2820 process receives this signal, and is immediately reset after being processed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2821 The <literal>ngx_exiting</literal> variable is set to <literal>1</literal> while |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2822 a worker process is in the shutdown state. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2823 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2824 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2825 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2826 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2827 <listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2828 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2829 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2830 <literal>NGX_TERMINATE_SIGNAL</literal> (<literal>SIGTERM</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2831 systems) — Terminate. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2832 Upon receiving this signal, the master process sends a terminate signal to all |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2833 child processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2834 If a child process does not exit within 1 second, the master process sends the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2835 <literal>SIGKILL</literal> signal to kill it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2836 When no child processes are left, the master process destroys the cycle pool and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2837 exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2838 When a worker process, the cache manager process or the cache loader process |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2839 receives this signal, it destroys the cycle pool and exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2840 The variable <literal>ngx_terminate</literal> is set to <literal>1</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2841 when this signal is received. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2842 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2843 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2844 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2845 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2846 <listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2847 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2848 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2849 <literal>NGX_NOACCEPT_SIGNAL</literal> (<literal>SIGWINCH</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2850 systems) - Shut down all worker and helper processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2851 Upon receiving this signal, the master process shuts down its child processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2852 If a previously started new nginx binary exits, the child processes of the old |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2853 master are started again. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2854 When a worker process receives this signal, it shuts down in debug mode |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2855 set by the <literal>debug_points</literal> directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2856 </para> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2857 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2858 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2859 </listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2860 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2861 <listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2862 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2863 <para> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2864 <literal>NGX_RECONFIGURE_SIGNAL</literal> (<literal>SIGHUP</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2865 systems) - Reconfigure. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2866 Upon receiving this signal, the master process re-reads the configuration and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2867 creates a new cycle based on it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2868 If the new cycle is created successfully, the old cycle is deleted and new |
1899 | 2869 child processes are started. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2870 Meanwhile, the old child processes receive the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2871 <literal>NGX_SHUTDOWN_SIGNAL</literal> signal. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2872 In single-process mode, nginx creates a new cycle, but keeps the old one until |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2873 there are no longer clients with active connections tied to it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2874 The worker and helper processes ignore this signal. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2875 </para> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2876 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2877 </listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2878 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2879 <listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2880 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2881 <para> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2882 <literal>NGX_REOPEN_SIGNAL</literal> (<literal>SIGUSR1</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2883 systems) — Reopen files. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2884 The master process sends this signal to workers, which reopen all |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2885 <literal>open_files</literal> related to the cycle. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2886 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2887 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2888 </listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2889 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2890 <listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2891 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2892 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2893 <literal>NGX_CHANGEBIN_SIGNAL</literal> (<literal>SIGUSR2</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2894 systems) — Change the nginx binary. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2895 The master process starts a new nginx binary and passes in a list of all listen |
1899 | 2896 sockets. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2897 The text-format list, passed in the <literal>“NGINX”</literal> environment |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2898 variable, consists of descriptor numbers separated with semicolons. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2899 The new nginx binary reads the <literal>“NGINX”</literal> variable and adds the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2900 sockets to its init cycle. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2901 Other processes ignore this signal. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2902 </para> |
1899 | 2903 |
2904 </listitem> | |
2905 | |
2906 </list> | |
2907 | |
2908 <para> | |
2909 While all nginx worker processes are able to receive and properly handle POSIX | |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2910 signals, the master process does not use the standard <literal>kill()</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2911 syscall to pass signals to workers and helpers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2912 Instead, nginx uses inter-process socket pairs which allow sending messages |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2913 between all nginx processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2914 Currently, however, messages are only sent from the master to its children. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2915 The messages carry the standard signals. |
1899 | 2916 </para> |
2917 | |
2918 </section> | |
2919 | |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2920 <section name="Threads" id="threads"> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2921 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2922 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2923 It is possible to offload into a separate thread tasks that would otherwise |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2924 block the nginx worker process. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2925 For example, nginx can be configured to use threads to perform |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2926 <link doc="../http/ngx_http_core_module.xml" id="aio">file I/O</link>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2927 Another use case is a library that doesn't have asynchronous interface |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2928 and thus cannot be normally used with nginx. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2929 Keep in mind that the threads interface is a helper for the existing |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2930 asynchronous approach to processing client connections, and by no means |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2931 intended as a replacement. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2932 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2933 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2934 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2935 To deal with synchronization, the following wrappers over |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2936 <literal>pthreads</literal> primitives are available: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2937 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2938 <list type="bullet"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2939 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2940 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2941 <literal>typedef pthread_mutex_t ngx_thread_mutex_t;</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2942 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2943 <list type="bullet"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2944 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2945 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2946 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2947 ngx_thread_mutex_create(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2948 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2949 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2950 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2951 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2952 ngx_thread_mutex_destroy(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2953 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2954 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2955 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2956 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2957 ngx_thread_mutex_lock(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2958 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2959 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2960 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2961 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2962 ngx_thread_mutex_unlock(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2963 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2964 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2965 </list> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2966 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2967 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2968 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2969 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2970 <literal>typedef pthread_cond_t ngx_thread_cond_t;</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2971 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2972 <list type="bullet"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2973 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2974 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2975 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2976 ngx_thread_cond_create(ngx_thread_cond_t *cond, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2977 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2978 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2979 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2980 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2981 ngx_thread_cond_destroy(ngx_thread_cond_t *cond, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2982 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2983 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2984 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2985 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2986 ngx_thread_cond_signal(ngx_thread_cond_t *cond, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2987 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2988 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2989 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2990 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2991 ngx_thread_cond_wait(ngx_thread_cond_t *cond, ngx_thread_mutex_t *mtx, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2992 ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2993 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2994 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2995 </list> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2996 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2997 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2998 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2999 </list> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3000 |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3001 </para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3002 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3003 <para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3004 Instead of creating a new thread for each task, nginx implements |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3005 a <link doc="../ngx_core_module.xml" id="thread_pool"/> strategy. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3006 Multiple thread pools may be configured for different purposes |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3007 (for example, performing I/O on different sets of disks). |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3008 Each thread pool is created at startup and contains a limited number of threads |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3009 that process a queue of tasks. |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3010 When a task is completed, a predefined completion handler is called. |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3011 </para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3012 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3013 <para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3014 The <literal>src/core/ngx_thread_pool.h</literal> header file contains |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3015 relevant definitions: |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3016 <programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3017 struct ngx_thread_task_s { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3018 ngx_thread_task_t *next; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3019 ngx_uint_t id; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3020 void *ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3021 void (*handler)(void *data, ngx_log_t *log); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3022 ngx_event_t event; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3023 }; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3024 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3025 typedef struct ngx_thread_pool_s ngx_thread_pool_t; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3026 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3027 ngx_thread_pool_t *ngx_thread_pool_add(ngx_conf_t *cf, ngx_str_t *name); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3028 ngx_thread_pool_t *ngx_thread_pool_get(ngx_cycle_t *cycle, ngx_str_t *name); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3029 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3030 ngx_thread_task_t *ngx_thread_task_alloc(ngx_pool_t *pool, size_t size); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3031 ngx_int_t ngx_thread_task_post(ngx_thread_pool_t *tp, ngx_thread_task_t *task); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3032 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3033 </programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3034 At configuration time, a module willing to use threads has to obtain a |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3035 reference to a thread pool by calling |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3036 <literal>ngx_thread_pool_add(cf, name)</literal>, which either creates a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3037 new thread pool with the given <literal>name</literal> or returns a reference |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3038 to the pool with that name if it already exists. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3039 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3040 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3041 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3042 To add a <literal>task</literal> into a queue of a specified thread pool |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3043 <literal>tp</literal> at runtime, use the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3044 <literal>ngx_thread_task_post(tp, task)</literal> function. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3045 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3046 To execute a function in a thread, pass parameters and setup a completion |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3047 handler using the <literal>ngx_thread_task_t</literal> structure: |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3048 <programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3049 typedef struct { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3050 int foo; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3051 } my_thread_ctx_t; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3052 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3053 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3054 static void |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3055 my_thread_func(void *data, ngx_log_t *log) |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3056 { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3057 my_thread_ctx_t *ctx = data; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3058 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3059 /* this function is executed in a separate thread */ |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3060 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3061 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3062 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3063 static void |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3064 my_thread_completion(ngx_event_t *ev) |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3065 { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3066 my_thread_ctx_t *ctx = ev->data; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3067 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3068 /* executed in nginx event loop */ |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3069 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3070 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3071 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3072 ngx_int_t |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3073 my_task_offload(my_conf_t *conf) |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3074 { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3075 my_thread_ctx_t *ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3076 ngx_thread_task_t *task; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3077 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3078 task = ngx_thread_task_alloc(conf->pool, sizeof(my_thread_ctx_t)); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3079 if (task == NULL) { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3080 return NGX_ERROR; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3081 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3082 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3083 ctx = task->ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3084 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3085 ctx->foo = 42; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3086 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3087 task->handler = my_thread_func; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3088 task->event.handler = my_thread_completion; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3089 task->event.data = ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3090 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3091 if (ngx_thread_task_post(conf->thread_pool, task) != NGX_OK) { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3092 return NGX_ERROR; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3093 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3094 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3095 return NGX_OK; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3096 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3097 </programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3098 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3099 </para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3100 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3101 </section> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3102 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3103 |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3104 <section name="Modules" id="Modules"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3105 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3106 <section name="Adding new modules" id="adding_new_modules"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3107 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3108 Each standalone nginx module resides in a separate directory that contains |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3109 at least two files: |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3110 <literal>config</literal> and a file with the module source code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3111 The <literal>config</literal> file contains all information needed for nginx to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3112 integrate the module, for example: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3113 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3114 ngx_module_type=CORE |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3115 ngx_module_name=ngx_foo_module |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3116 ngx_module_srcs="$ngx_addon_dir/ngx_foo_module.c" |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3117 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3118 . auto/module |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3119 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3120 ngx_addon_name=$ngx_module_name |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3121 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3122 The <literal>config</literal> file is a POSIX shell script that can set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3123 and access the following variables: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3124 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3125 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3126 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3127 <literal>ngx_module_type</literal> — Type of module to build. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3128 Possible values are <literal>CORE</literal>, <literal>HTTP</literal>, |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3129 <literal>HTTP_FILTER</literal>, <literal>HTTP_INIT_FILTER</literal>, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3130 <literal>HTTP_AUX_FILTER</literal>, <literal>MAIL</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3131 <literal>STREAM</literal>, or <literal>MISC</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3132 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3133 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3134 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3135 <literal>ngx_module_name</literal> — Module names. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3136 To build multiple modules from a set of source files, specify a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3137 whitespace-separated list of names. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3138 The first name indicates the name of the output binary for the dynamic module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3139 The names in the list must match the names used in the source code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3140 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3141 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3142 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3143 <literal>ngx_addon_name</literal> — Name of the module as it appears in output |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3144 on the console from the configure script. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3145 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3146 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3147 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3148 <literal>ngx_module_srcs</literal> — Whitespace-separated list of source |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3149 files used to compile the module. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3150 The <literal>$ngx_addon_dir</literal> variable can be used to represent the path |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3151 to the module directory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3152 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3153 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3154 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3155 <literal>ngx_module_incs</literal> — Include paths required to build the module |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3156 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3157 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3158 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3159 <literal>ngx_module_deps</literal> — Whitespace-separated list of the module's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3160 dependencies. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3161 Usually, it is the list of header files. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3162 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3163 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3164 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3165 <literal>ngx_module_libs</literal> — Whitespace-separated list of libraries to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3166 link with the module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3167 For example, use <literal>ngx_module_libs=-lpthread</literal> to link |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3168 <literal>libpthread</literal> library. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3169 The following macros can be used to link against the same libraries as |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3170 nginx: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3171 <literal>LIBXSLT</literal>, <literal>LIBGD</literal>, <literal>GEOIP</literal>, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3172 <literal>PCRE</literal>, <literal>OPENSSL</literal>, <literal>MD5</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3173 <literal>SHA1</literal>, <literal>ZLIB</literal>, and <literal>PERL</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3174 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3175 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3176 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3177 <literal>ngx_module_link</literal> — Variable set by the build system to |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3178 <literal>DYNAMIC</literal> for a dynamic module or <literal>ADDON</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3179 for a static module and used to determine different actions to perform |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3180 depending on linking type. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3181 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3182 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3183 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3184 <literal>ngx_module_order</literal> — Load order for the module; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3185 useful for the <literal>HTTP_FILTER</literal> and |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3186 <literal>HTTP_AUX_FILTER</literal> module types. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3187 The format for this option is a whitespace-separated list of modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3188 All modules in the list following the current module's name end up after it in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3189 the global list of modules, which sets up the order for modules initialization. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3190 For filter modules later initialization means earlier execution. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3191 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3192 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3193 The following modules are typically used as references. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3194 The <literal>ngx_http_copy_filter_module</literal> reads the data for other |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3195 filter modules and is placed near the bottom of the list so that it is one of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3196 the first to be executed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3197 The <literal>ngx_http_write_filter_module</literal> writes the data to the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3198 client socket and is placed near the top of the list, and is the last to be |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3199 executed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3200 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3201 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3202 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3203 By default, filter modules are placed before the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3204 <literal>ngx_http_copy_filter</literal> in the module list so that the filter |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3205 handler is executed after the copy filter handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3206 For other module types the default is the empty string. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3207 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3208 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3209 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3210 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3211 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3212 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3213 To compile a module into nginx statically, use the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3214 <literal>--add-module=/path/to/module</literal> argument to the configure |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3215 script. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3216 To compile a module for later dynamic loading into nginx, use the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3217 <literal>--add-dynamic-module=/path/to/module</literal> argument. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3218 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3219 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3220 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3221 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3222 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3223 <section name="Core Modules" id="core_modules"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3224 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3225 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3226 Modules are the building blocks of nginx, and most of its functionality is |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3227 implemented as modules. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3228 The module source file must contain a global variable of type |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3229 <literal>ngx_module_t</literal>, which is defined as follows: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3230 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3231 struct ngx_module_s { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3232 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3233 /* private part is omitted */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3234 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3235 void *ctx; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3236 ngx_command_t *commands; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3237 ngx_uint_t type; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3238 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3239 ngx_int_t (*init_master)(ngx_log_t *log); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3240 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3241 ngx_int_t (*init_module)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3242 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3243 ngx_int_t (*init_process)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3244 ngx_int_t (*init_thread)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3245 void (*exit_thread)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3246 void (*exit_process)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3247 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3248 void (*exit_master)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3249 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3250 /* stubs for future extensions are omitted */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3251 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3252 </programlisting> |
2007
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3253 The omitted private part includes the module version and a signature and is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3254 filled using the predefined macro <literal>NGX_MODULE_V1</literal>. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3255 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3256 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3257 <para> |
2c14a16c61eb
Added modules section to development guide.
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parents:
1920
diff
changeset
|
3258 Each module keeps its private data in the <literal>ctx</literal> field, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3259 recognizes the configuration directives, specified in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3260 <literal>commands</literal> array, and can be invoked at certain stages of |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3261 nginx lifecycle. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3262 The module lifecycle consists of the following events: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3263 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3264 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3265 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3266 <listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3267 Configuration directive handlers are called as they appear |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3268 in configuration files in the context of the master process. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3269 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3270 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3271 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3272 After the configuration is parsed successfully, <literal>init_module</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3273 handler is called in the context of the master process. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3274 The <literal>init_module</literal> handler is called in the master process each |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3275 time a configuration is loaded. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3276 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3277 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3278 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3279 The master process creates one or more worker processes and the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3280 <literal>init_process</literal> handler is called in each of them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3281 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3282 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3283 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3284 When a worker process receives the shutdown or terminate command from the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3285 master, it invokes the <literal>exit_process</literal> handler. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3286 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3287 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3288 <listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3289 The master process calls the <literal>exit_master</literal> handler before |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3290 exiting. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3291 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3292 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3293 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3294 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3295 Because threads are used in nginx only as a supplementary I/O facility with its |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3296 own API, <literal>init_thread</literal> and <literal>exit_thread</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3297 handlers are not currently called. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3298 There is also no <literal>init_master</literal> handler, because it would be |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3299 unnecessary overhead. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3300 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3301 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3302 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3303 The module <literal>type</literal> defines exactly what is stored in the |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3304 <literal>ctx</literal> field. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3305 Its value is one of the following types: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3306 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3307 <listitem><literal>NGX_CORE_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3308 <listitem><literal>NGX_EVENT_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3309 <listitem><literal>NGX_HTTP_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3310 <listitem><literal>NGX_MAIL_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3311 <listitem><literal>NGX_STREAM_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3312 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3313 The <literal>NGX_CORE_MODULE</literal> is the most basic and thus the most |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3314 generic and most low-level type of module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3315 The other module types are implemented on top of it and provide a more |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3316 convenient way to deal with corresponding domains, like handling events or HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3317 requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3318 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3319 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3320 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3321 The set of core modules includes <literal>ngx_core_module</literal>, |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3322 <literal>ngx_errlog_module</literal>, <literal>ngx_regex_module</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3323 <literal>ngx_thread_pool_module</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3324 <literal>ngx_openssl_module</literal> modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3325 The HTTP module, the stream module, the mail module and event modules are core |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3326 modules too. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3327 The context of a core module is defined as: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3328 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3329 typedef struct { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3330 ngx_str_t name; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3331 void *(*create_conf)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3332 char *(*init_conf)(ngx_cycle_t *cycle, void *conf); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3333 } ngx_core_module_t; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3334 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3335 where the <literal>name</literal> is a module name string, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3336 <literal>create_conf</literal> and <literal>init_conf</literal> |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3337 are pointers to functions that create and initialize module configuration |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3338 respectively. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3339 For core modules, nginx calls <literal>create_conf</literal> before parsing |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3340 a new configuration and <literal>init_conf</literal> after all configuration |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3341 is parsed successfully. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3342 The typical <literal>create_conf</literal> function allocates memory for the |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3343 configuration and sets default values. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3344 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3345 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3346 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3347 For example, a simplistic module called <literal>ngx_foo_module</literal> might |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3348 look like this: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3349 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3350 /* |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3351 * Copyright (C) Author. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3352 */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3353 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3354 |
2c14a16c61eb
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Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3355 #include <ngx_config.h> |
2c14a16c61eb
Added modules section to development guide.
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1920
diff
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|
3356 #include <ngx_core.h> |
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Added modules section to development guide.
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1920
diff
changeset
|
3357 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3358 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3359 typedef struct { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
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1920
diff
changeset
|
3360 ngx_flag_t enable; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3361 } ngx_foo_conf_t; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3362 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3363 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3364 static void *ngx_foo_create_conf(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3365 static char *ngx_foo_init_conf(ngx_cycle_t *cycle, void *conf); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3366 |
2c14a16c61eb
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Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3367 static char *ngx_foo_enable(ngx_conf_t *cf, void *post, void *data); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
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1920
diff
changeset
|
3368 static ngx_conf_post_t ngx_foo_enable_post = { ngx_foo_enable }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
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1920
diff
changeset
|
3369 |
2c14a16c61eb
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Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3370 |
2c14a16c61eb
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parents:
1920
diff
changeset
|
3371 static ngx_command_t ngx_foo_commands[] = { |
2c14a16c61eb
Added modules section to development guide.
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1920
diff
changeset
|
3372 |
2c14a16c61eb
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1920
diff
changeset
|
3373 { ngx_string("foo_enabled"), |
2c14a16c61eb
Added modules section to development guide.
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1920
diff
changeset
|
3374 NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_FLAG, |
2c14a16c61eb
Added modules section to development guide.
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parents:
1920
diff
changeset
|
3375 ngx_conf_set_flag_slot, |
2c14a16c61eb
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parents:
1920
diff
changeset
|
3376 0, |
2c14a16c61eb
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parents:
1920
diff
changeset
|
3377 offsetof(ngx_foo_conf_t, enable), |
2c14a16c61eb
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1920
diff
changeset
|
3378 &ngx_foo_enable_post }, |
2c14a16c61eb
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parents:
1920
diff
changeset
|
3379 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3380 ngx_null_command |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3381 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3382 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3383 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3384 static ngx_core_module_t ngx_foo_module_ctx = { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3385 ngx_string("foo"), |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3386 ngx_foo_create_conf, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3387 ngx_foo_init_conf |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3388 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3389 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3390 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3391 ngx_module_t ngx_foo_module = { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3392 NGX_MODULE_V1, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3393 &ngx_foo_module_ctx, /* module context */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3394 ngx_foo_commands, /* module directives */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3395 NGX_CORE_MODULE, /* module type */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3396 NULL, /* init master */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3397 NULL, /* init module */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3398 NULL, /* init process */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3399 NULL, /* init thread */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3400 NULL, /* exit thread */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3401 NULL, /* exit process */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3402 NULL, /* exit master */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3403 NGX_MODULE_V1_PADDING |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3404 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3405 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3406 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3407 static void * |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3408 ngx_foo_create_conf(ngx_cycle_t *cycle) |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3409 { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3410 ngx_foo_conf_t *fcf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3411 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3412 fcf = ngx_pcalloc(cycle->pool, sizeof(ngx_foo_conf_t)); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3413 if (fcf == NULL) { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3414 return NULL; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3415 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3416 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3417 fcf->enable = NGX_CONF_UNSET; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3418 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3419 return fcf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3420 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3421 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3422 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3423 static char * |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3424 ngx_foo_init_conf(ngx_cycle_t *cycle, void *conf) |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3425 { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3426 ngx_foo_conf_t *fcf = conf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3427 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3428 ngx_conf_init_value(fcf->enable, 0); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3429 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3430 return NGX_CONF_OK; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3431 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3432 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3433 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3434 static char * |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3435 ngx_foo_enable(ngx_conf_t *cf, void *post, void *data) |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3436 { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3437 ngx_flag_t *fp = data; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3438 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3439 if (*fp == 0) { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3440 return NGX_CONF_OK; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3441 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3442 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3443 ngx_log_error(NGX_LOG_NOTICE, cf->log, 0, "Foo Module is enabled"); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3444 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3445 return NGX_CONF_OK; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3446 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3447 </programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3448 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3449 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3450 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3451 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3452 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3453 <section name="Configuration Directives" id="config_directives"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3454 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3455 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3456 The <literal>ngx_command_t</literal> type defines a single configuration |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3457 directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3458 Each module that supports configuration provides an array of such structures |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3459 that describe how to process arguments and what handlers to call: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3460 <programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3461 typedef struct ngx_command_s ngx_command_t; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3462 |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3463 struct ngx_command_s { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3464 ngx_str_t name; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3465 ngx_uint_t type; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3466 char *(*set)(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3467 ngx_uint_t conf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3468 ngx_uint_t offset; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3469 void *post; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3470 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3471 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3472 Terminate the array with the special value <literal>ngx_null_command</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3473 The <literal>name</literal> is the name of a directive as it appears |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3474 in the configuration file, for example "worker_processes" or "listen". |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3475 The <literal>type</literal> is a bit-field of flags that specify the number of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3476 arguments the directive takes, its type, and the context in which it appears. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3477 The flags are: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3478 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3479 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3480 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3481 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3482 <literal>NGX_CONF_NOARGS</literal> — Directive takes no arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3483 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3484 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3485 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3486 <literal>NGX_CONF_1MORE</literal> — Directive takes one or more arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3487 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3488 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3489 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3490 <literal>NGX_CONF_2MORE</literal> — Directive takes two or more arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3491 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3492 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3493 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3494 <literal>NGX_CONF_TAKE1</literal>..<literal>NGX_CONF_TAKE7</literal> — |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3495 Directive takes exactly the indicated number of arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3496 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3497 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3498 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3499 <literal>NGX_CONF_TAKE12</literal>, <literal>NGX_CONF_TAKE13</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3500 <literal>NGX_CONF_TAKE23</literal>, <literal>NGX_CONF_TAKE123</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3501 <literal>NGX_CONF_TAKE1234</literal> — Directive may take different number of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3502 arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3503 Options are limited to the given numbers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3504 For example, <literal>NGX_CONF_TAKE12</literal> means it takes one or two |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3505 arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3506 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3507 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3508 </list> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3509 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3510 The flags for directive types are: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3511 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3512 <list type="bullet"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3513 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3514 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3515 <literal>NGX_CONF_BLOCK</literal> — Directive is a block, that is, it can |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3516 contain other directives within its opening and closing curly braces, or even |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3517 implement its own parser to handle contents inside. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3518 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3519 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3520 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3521 <literal>NGX_CONF_FLAG</literal> — Directive takes a boolean value, either |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3522 <literal>on</literal> or <literal>off</literal>. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3523 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3524 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3525 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3526 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3527 A directive's context defines where it may appear in the configuration: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3528 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3529 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3530 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3531 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3532 <literal>NGX_MAIN_CONF</literal> — In the top level context. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3533 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3534 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3535 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3536 <literal>NGX_HTTP_MAIN_CONF</literal> — In the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3537 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3538 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3539 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3540 <literal>NGX_HTTP_SRV_CONF</literal> — In a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3541 within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3542 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3543 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3544 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3545 <literal>NGX_HTTP_LOC_CONF</literal> — In a <literal>location</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3546 within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3547 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3548 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3549 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3550 <literal>NGX_HTTP_UPS_CONF</literal> — In an <literal>upstream</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3551 within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3552 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3553 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3554 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3555 <literal>NGX_HTTP_SIF_CONF</literal> — In an <literal>if</literal> block within |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3556 a <literal>server</literal> block in the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3557 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3558 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3559 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3560 <literal>NGX_HTTP_LIF_CONF</literal> — In an <literal>if</literal> block within |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3561 a <literal>location</literal> block in the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3562 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3563 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3564 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3565 <literal>NGX_HTTP_LMT_CONF</literal> — In a <literal>limit_except</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3566 block within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3567 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3568 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3569 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3570 <literal>NGX_STREAM_MAIN_CONF</literal> — In the <literal>stream</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3571 block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3572 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3573 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3574 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3575 <literal>NGX_STREAM_SRV_CONF</literal> — In a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3576 within the <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3577 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3578 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3579 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3580 <literal>NGX_STREAM_UPS_CONF</literal> — In an <literal>upstream</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3581 within the <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3582 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3583 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3584 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3585 <literal>NGX_MAIL_MAIN_CONF</literal> — In the <literal>mail</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3586 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3587 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3588 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3589 <literal>NGX_MAIL_SRV_CONF</literal> — In a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3590 within the <literal>mail</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3591 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3592 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3593 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3594 <literal>NGX_EVENT_CONF</literal> — In the <literal>event</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3595 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3596 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3597 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3598 <literal>NGX_DIRECT_CONF</literal> — Used by modules that don't |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3599 create a hierarchy of contexts and only have one global configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3600 This configuration is passed to the handler as the <literal>conf</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3601 argument. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3602 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3603 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3604 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3605 The configuration parser uses these flags to throw an error in case of |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3606 a misplaced directive and calls directive handlers supplied with a proper |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3607 configuration pointer, so that the same directives in different locations can |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3608 store their values in distinct places. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3609 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3610 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3611 <para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3612 The <literal>set</literal> field defines a handler that processes a directive |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3613 and stores parsed values into the corresponding configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3614 There's a number of functions that perform common conversions: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3615 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3616 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3617 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3618 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3619 <literal>ngx_conf_set_flag_slot</literal> — Converts the literal strings |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3620 <literal>on</literal> and <literal>off</literal> into an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3621 <literal>ngx_flag_t</literal> value with values 1 or 0, respectively. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3622 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3623 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3624 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3625 <literal>ngx_conf_set_str_slot</literal> — Stores a string as a value of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3626 <literal>ngx_str_t</literal> type. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3627 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3628 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3629 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3630 <literal>ngx_conf_set_str_array_slot</literal> — Appends a value to an array |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3631 <literal>ngx_array_t</literal> of strings <literal>ngx_str_t</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3632 The array is created if does not already exist. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3633 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3634 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3635 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3636 <literal>ngx_conf_set_keyval_slot</literal> — Appends a key-value pair to an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3637 array <literal>ngx_array_t</literal> of key-value pairs |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3638 <literal>ngx_keyval_t</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3639 The first string becomes the key and the second the value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3640 The array is created if it does not already exist. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3641 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3642 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3643 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3644 <literal>ngx_conf_set_num_slot</literal> — Converts a directive's argument |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3645 to an <literal>ngx_int_t</literal> value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3646 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3647 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3648 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3649 <literal>ngx_conf_set_size_slot</literal> — Converts a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3650 <link doc="../syntax.xml">size</link> to a <literal>size_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3651 expressed in bytes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3652 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3653 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3654 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3655 <literal>ngx_conf_set_off_slot</literal> — Converts an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3656 <link doc="../syntax.xml">offset</link> to an <literal>off_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3657 expressed in bytes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3658 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3659 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3660 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3661 <literal>ngx_conf_set_msec_slot</literal> — Converts a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3662 <link doc="../syntax.xml">time</link> to an <literal>ngx_msec_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3663 expressed in milliseconds. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3664 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3665 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3666 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3667 <literal>ngx_conf_set_sec_slot</literal> — Converts a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3668 <link doc="../syntax.xml">time</link> to a <literal>time_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3669 expressed in in seconds. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3670 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3671 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3672 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3673 <literal>ngx_conf_set_bufs_slot</literal> — Converts the two supplied arguments |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3674 into an <literal>ngx_bufs_t</literal> object that holds the number and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3675 <link doc="../syntax.xml">size</link> of buffers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3676 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3677 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3678 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3679 <literal>ngx_conf_set_enum_slot</literal> — Converts the supplied argument |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3680 into an <literal>ngx_uint_t</literal> value. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3681 The null-terminated array of <literal>ngx_conf_enum_t</literal> passed in the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3682 <literal>post</literal> field defines the acceptable strings and corresponding |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3683 integer values. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3684 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3685 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3686 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3687 <literal>ngx_conf_set_bitmask_slot</literal> — Converts the supplied arguments |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3688 into an <literal>ngx_uint_t</literal> value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3689 The mask values for each argument are ORed producing the result. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3690 The null-terminated array of <literal>ngx_conf_bitmask_t</literal> passed in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3691 <literal>post</literal> field defines the acceptable strings and corresponding |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3692 mask values. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3693 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3694 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3695 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3696 <literal>set_path_slot</literal> — Converts the supplied arguments to an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3697 <literal>ngx_path_t</literal> value and performs all required initializations. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3698 For details, see the documentation for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3699 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_temp_path"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3700 proxy_temp_path</link> directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3701 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3702 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3703 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3704 <literal>set_access_slot</literal> — Converts the supplied arguments to a file |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3705 permissions mask. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3706 For details, see the documentation for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3707 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_store_access"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3708 proxy_store_access</link> directive. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3709 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3710 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3711 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3712 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3713 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3714 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3715 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3716 The <literal>conf</literal> field defines which configuration structure is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3717 passed to the directory handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3718 Core modules only have the global configuration and set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3719 <literal>NGX_DIRECT_CONF</literal> flag to access it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3720 Modules like HTTP, Stream or Mail create hierarchies of configurations. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3721 For example, a module's configuration is created for <literal>server</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3722 <literal>location</literal> and <literal>if</literal> scopes. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3723 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3724 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3725 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3726 <literal>NGX_HTTP_MAIN_CONF_OFFSET</literal> — Configuration for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3727 <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3728 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3729 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3730 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3731 <literal>NGX_HTTP_SRV_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3732 <literal>server</literal> block within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3733 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3734 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3735 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3736 <literal>NGX_HTTP_LOC_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3737 <literal>location</literal> block within the <literal>http</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3738 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3739 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3740 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3741 <literal>NGX_STREAM_MAIN_CONF_OFFSET</literal> — Configuration for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3742 <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3743 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3744 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3745 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3746 <literal>NGX_STREAM_SRV_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3747 <literal>server</literal> block within the <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3748 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3749 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3750 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3751 <literal>NGX_MAIL_MAIN_CONF_OFFSET</literal> — Configuration for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3752 <literal>mail</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3753 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3754 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3755 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3756 <literal>NGX_MAIL_SRV_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3757 <literal>server</literal> block within the <literal>mail</literal> block. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3758 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3759 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3760 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3761 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3762 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3763 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3764 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3765 The <literal>offset</literal> defines the offset of a field in a module |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3766 configuration structure that holds values for this particular directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3767 The typical use is to employ the <literal>offsetof()</literal> macro. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3768 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3769 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3770 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3771 The <literal>post</literal> field has two purposes: it may be used to define |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3772 a handler to be called after the main handler has completed, or to pass |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3773 additional data to the main handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3774 In the first case, the <literal>ngx_conf_post_t</literal> structure needs to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3775 be initialized with a pointer to the handler, for example: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3776 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3777 static char *ngx_do_foo(ngx_conf_t *cf, void *post, void *data); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3778 static ngx_conf_post_t ngx_foo_post = { ngx_do_foo }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3779 </programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3780 The <literal>post</literal> argument is the <literal>ngx_conf_post_t</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3781 object itself, and the <literal>data</literal> is a pointer to the value, |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3782 converted from arguments by the main handler with the appropriate type. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3783 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3784 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3785 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3786 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3787 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3788 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3789 |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3790 <section name="HTTP" id="http"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3791 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3792 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3793 <section name="Connection" id="http_connection"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3794 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3795 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3796 Each HTTP client connection runs through the following stages: |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3797 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3798 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3799 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3800 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3801 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3802 <literal>ngx_event_accept()</literal> accepts a client TCP connection. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3803 This handler is called in response to a read notification on a listen socket. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3804 A new <literal>ngx_connecton_t</literal> object is created at this stage |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3805 to wrap the newly accepted client socket. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3806 Each nginx listener provides a handler to pass the new connection object to. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3807 For HTTP connections it's <literal>ngx_http_init_connection(c)</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3808 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3809 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3810 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3811 <literal>ngx_http_init_connection()</literal> performs early initialization of |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3812 the HTTP connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3813 At this stage an <literal>ngx_http_connection_t</literal> object is created for |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3814 the connection and its reference is stored in the connection's |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3815 <literal>data</literal> field. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3816 Later it will be replaced by an HTTP request object. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3817 A PROXY protocol parser and the SSL handshake are started at |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3818 this stage as well. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3819 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3820 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3821 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3822 <literal>ngx_http_wait_request_handler()</literal> read event handler |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3823 is called when data is available on the client socket. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3824 At this stage an HTTP request object <literal>ngx_http_request_t</literal> is |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3825 created and set to the connection's <literal>data</literal> field. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3826 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3827 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3828 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3829 <literal>ngx_http_process_request_line()</literal> read event handler |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3830 reads client request line. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3831 The handler is set by <literal>ngx_http_wait_request_handler()</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3832 The data is read into connection's <literal>buffer</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3833 The size of the buffer is initially set by the directive |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3834 <link doc="../http/ngx_http_core_module.xml" id="client_header_buffer_size"/>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3835 The entire client header is supposed to fit in the buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3836 If the initial size is not sufficient, a bigger buffer is allocated, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3837 with the capacity set by the <literal>large_client_header_buffers</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3838 directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3839 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3840 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3841 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3842 <literal>ngx_http_process_request_headers()</literal> read event handler, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3843 is set after <literal>ngx_http_process_request_line()</literal> to read |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3844 the client request header. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3845 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3846 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3847 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3848 <literal>ngx_http_core_run_phases()</literal> is called when the request header |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3849 is completely read and parsed. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3850 This function runs request phases from |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3851 <literal>NGX_HTTP_POST_READ_PHASE</literal> to |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3852 <literal>NGX_HTTP_CONTENT_PHASE</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3853 The last phase is intended to generate a response and pass it along the filter |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3854 chain. |
1979 | 3855 The response is not necessarily sent to the client at this phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3856 It might remain buffered and be sent at the finalization stage. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3857 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3858 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3859 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3860 <literal>ngx_http_finalize_request()</literal> is usually called when the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3861 request has generated all the output or produced an error. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3862 In the latter case an appropriate error page is looked up and used as the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3863 response. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3864 If the response is not completely sent to the client by this point, an |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3865 HTTP writer <literal>ngx_http_writer()</literal> is activated to finish |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3866 sending outstanding data. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3867 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3868 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3869 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3870 <literal>ngx_http_finalize_connection()</literal> is called when the complete |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3871 response has been sent to the client and the request can be destroyed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3872 If the client connection keepalive feature is enabled, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3873 <literal>ngx_http_set_keepalive()</literal> is called, which destroys the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3874 current request and waits for the next request on the connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3875 Otherwise, <literal>ngx_http_close_request()</literal> destroys both the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3876 request and the connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3877 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3878 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3879 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3880 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3881 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3882 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3883 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3884 <section name="Request" id="http_request"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3885 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3886 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3887 For each client HTTP request the <literal>ngx_http_request_t</literal> object is |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3888 created. Some of the fields of this object are: |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3889 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3890 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3891 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3892 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3893 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3894 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3895 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3896 <literal>connection</literal> — Pointer to a <literal>ngx_connection_t</literal> |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3897 client connection object. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3898 Several requests can reference the same connection object at the same time - |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3899 one main request and its subrequests. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3900 After a request is deleted, a new request can be created on the same connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3901 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3902 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3903 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3904 Note that for HTTP connections <literal>ngx_connection_t</literal>'s |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3905 <literal>data</literal> field points back to the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3906 Such requests are called active, as opposed to the other requests tied to the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3907 connection. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3908 An active request is used to handle client connection events and is allowed to |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3909 output its response to the client. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3910 Normally, each request becomes active at some point so that it can send its |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3911 output. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3912 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3913 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3914 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3915 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3916 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3917 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3918 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3919 <literal>ctx</literal> — Array of HTTP module contexts. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3920 Each module of type <literal>NGX_HTTP_MODULE</literal> can store any value |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3921 (normally, a pointer to a structure) in the request. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3922 The value is stored in the <literal>ctx</literal> array at the module's |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3923 <literal>ctx_index</literal> position. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3924 The following macros provide a convenient way to get and set request contexts: |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3925 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3926 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3927 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3928 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3929 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3930 <literal>ngx_http_get_module_ctx(r, module)</literal> — Returns |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3931 the <literal>module</literal>'s context |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3932 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3933 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3934 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3935 <literal>ngx_http_set_ctx(r, c, module)</literal> — Sets <literal>c</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3936 as the <literal>module</literal>'s context |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3937 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3938 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3939 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3940 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3941 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3942 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3943 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3944 <literal>main_conf</literal>, <literal>srv_conf</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3945 <literal>loc_conf</literal> — Arrays of current request |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3946 configurations. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3947 Configurations are stored at the module's <literal>ctx_index</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3948 positions. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3949 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3950 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3951 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3952 <literal>read_event_handler</literal>, <literal>write_event_handler</literal> - |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3953 Read and write event handlers for the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3954 Normally, both the read and write event handlers for an HTTP connection |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3955 are set to <literal>ngx_http_request_handler()</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3956 This function calls the <literal>read_event_handler</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3957 <literal>write_event_handler</literal> handlers for the currently |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3958 active request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3959 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3960 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3961 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3962 <literal>cache</literal> — Request cache object for caching the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3963 upstream response. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3964 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3965 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3966 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3967 <literal>upstream</literal> — Request upstream object for proxying. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3968 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3969 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3970 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3971 <literal>pool</literal> — Request pool. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3972 The request object itself is allocated in this pool, which is destroyed when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3973 the request is deleted. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3974 For allocations that need to be available throughout the client connection's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3975 lifetime, use <literal>ngx_connection_t</literal>'s pool instead. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3976 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3977 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3978 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3979 <literal>header_in</literal> — Buffer into which the client HTTP request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3980 header is read. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3981 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3982 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3983 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3984 <literal>headers_in</literal>, <literal>headers_out</literal> — Input and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3985 output HTTP headers objects. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3986 Both objects contain the <literal>headers</literal> field of type |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3987 <literal>ngx_list_t</literal> for keeping the raw list of headers. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3988 In addition to that, specific headers are available for getting and setting as |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3989 separate fields, for example <literal>content_length_n</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3990 <literal>status</literal> etc. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3991 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3992 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3993 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3994 <literal>request_body</literal> — Client request body object. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3995 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3996 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3997 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3998 <literal>start_sec</literal>, <literal>start_msec</literal> — Time point when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3999 the request was created, used for tracking request duration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4000 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4001 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4002 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4003 <literal>method</literal>, <literal>method_name</literal> — Numeric and text |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4004 representation of the client HTTP request method. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4005 Numeric values for methods are defined in |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4006 <literal>src/http/ngx_http_request.h</literal> with the macros |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4007 <literal>NGX_HTTP_GET</literal>, <literal>NGX_HTTP_HEAD</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4008 <literal>NGX_HTTP_POST</literal>, etc. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4009 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4010 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4011 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4012 <literal>http_protocol</literal> — Client HTTP protocol version in its |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4013 original text form (“HTTP/1.0”, “HTTP/1.1” etc). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4014 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4015 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4016 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4017 <literal>http_version</literal> — Client HTTP protocol version in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4018 numeric form (<literal>NGX_HTTP_VERSION_10</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4019 <literal>NGX_HTTP_VERSION_11</literal>, etc.). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4020 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4021 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4022 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4023 <literal>http_major</literal>, <literal>http_minor</literal> — Client HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4024 protocol version in numeric form split into major and minor parts. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4025 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4026 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4027 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4028 <literal>request_line</literal>, <literal>unparsed_uri</literal> — Request line |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4029 and URI in the original client request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4030 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4031 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4032 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4033 <literal>uri</literal>, <literal>args</literal>, <literal>exten</literal> — |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4034 URI, arguments and file extension for the current request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4035 The URI value here might differ from the original URI sent by the client due to |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4036 normalization. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4037 Throughout request processing, these values can change as internal redirects |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4038 are performed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4039 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4040 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4041 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4042 <literal>main</literal> — Pointer to a main request object. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4043 This object is created to process a client HTTP request, as opposed to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4044 subrequests, which are created to perform a specific subtask within the main |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4045 request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4046 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4047 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4048 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4049 <literal>parent</literal> — Pointer to the parent request of a subrequest. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4050 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4051 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4052 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4053 <literal>postponed</literal> — List of output buffers and subrequests, in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4054 order in which they are sent and created. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4055 The list is used by the postpone filter to provide consistent request output |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4056 when parts of it are created by subrequests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4057 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4058 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4059 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4060 <literal>post_subrequest</literal> — Pointer to a handler with the context |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4061 to be called when a subrequest gets finalized. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4062 Unused for main requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4063 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4064 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4065 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4066 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4067 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4068 <literal>posted_requests</literal> — List of requests to be started or |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4069 resumed, which is done by calling the request's |
1932 | 4070 <literal>write_event_handler</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4071 Normally, this handler holds the request main function, which at first runs |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4072 request phases and then produces the output. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4073 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4074 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4075 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4076 A request is usually posted by the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4077 <literal>ngx_http_post_request(r, NULL)</literal> call. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4078 It is always posted to the main request <literal>posted_requests</literal> list. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4079 The function <literal>ngx_http_run_posted_requests(c)</literal> runs all |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4080 requests that are posted in the main request of the passed |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4081 connection's active request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4082 All event handlers call <literal>ngx_http_run_posted_requests</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4083 which can lead to new posted requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4084 Normally, it is called after invoking a request's read or write handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4085 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4086 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4087 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4088 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4089 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4090 <literal>phase_handler</literal> — Index of current request phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4091 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4092 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4093 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4094 <literal>ncaptures</literal>, <literal>captures</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4095 <literal>captures_data</literal> — Regex captures produced |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4096 by the last regex match of the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4097 A regex match can occur at a number of places during request processing: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4098 map lookup, server lookup by SNI or HTTP Host, rewrite, proxy_redirect, etc. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4099 Captures produced by a lookup are stored in the above mentioned fields. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4100 The field <literal>ncaptures</literal> holds the number of captures, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4101 <literal>captures</literal> holds captures boundaries and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4102 <literal>captures_data</literal> holds the string against which the regex was |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4103 matched and which is used to extract captures. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4104 After each new regex match, request captures are reset to hold new values. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4105 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4106 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4107 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4108 <literal>count</literal> — Request reference counter. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4109 The field only makes sense for the main request. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4110 Increasing the counter is done by simple <literal>r->main->count++</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4111 To decrease the counter, call |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4112 <literal>ngx_http_finalize_request(r, rc)</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4113 Creating of a subrequest and running the request body read process both |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4114 increment the counter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4115 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4116 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4117 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4118 <literal>subrequests</literal> — Current subrequest nesting level. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4119 Each subrequest inherits its parent's nesting level, decreased by one. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4120 An error is generated if the value reaches zero. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4121 The value for the main request is defined by the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4122 <literal>NGX_HTTP_MAX_SUBREQUESTS</literal> constant. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4123 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4124 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4125 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4126 <literal>uri_changes</literal> — Number of URI changes remaining for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4127 the request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4128 The total number of times a request can change its URI is limited by the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4129 <literal>NGX_HTTP_MAX_URI_CHANGES</literal> constant. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4130 With each change the value is decremented until it reaches zero, at which time |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4131 an error is generated. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4132 Rewrites and internal redirects to normal or named locations are considered URI |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4133 changes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4134 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4135 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4136 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4137 <literal>blocked</literal> — Counter of blocks held on the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4138 While this value is non-zero, the request cannot be terminated. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4139 Currently, this value is increased by pending AIO operations (POSIX AIO and |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4140 thread operations) and active cache lock. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4141 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4142 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4143 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4144 <literal>buffered</literal> — Bitmask showing which modules have buffered the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4145 output produced by the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4146 A number of filters can buffer output; for example, sub_filter can buffer data |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4147 because of a partial string match, copy filter can buffer data because of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4148 lack of free output buffers etc. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4149 As long as this value is non-zero, the request is not finalized |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4150 pending the flush. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4151 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4152 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4153 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4154 <literal>header_only</literal> — Flag indicating that the output does not |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4155 require a body. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4156 For example, this flag is used by HTTP HEAD requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4157 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4158 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4159 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4160 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4161 <literal>keepalive</literal> — Flag indicating whether client connection |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4162 keepalive is supported. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4163 The value is inferred from the HTTP version and the value of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4164 <header>Connection</header> header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4165 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4166 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4167 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4168 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4169 <literal>header_sent</literal> — Flag indicating that the output header |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4170 has already been sent by the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4171 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4172 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4173 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4174 <literal>internal</literal> — Flag indicating that the current request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4175 is internal. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4176 To enter the internal state, a request must pass through an internal |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4177 redirect or be a subrequest. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4178 Internal requests are allowed to enter internal locations. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4179 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4180 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4181 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4182 <literal>allow_ranges</literal> — Flag indicating that a partial response |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4183 can be sent to the client, as requested by the HTTP Range header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4184 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4185 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4186 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4187 <literal>subrequest_ranges</literal> — Flag indicating that a partial response |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4188 can be sent while a subrequest is being processed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4189 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4190 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4191 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4192 <literal>single_range</literal> — Flag indicating that only a single continuous |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4193 range of output data can be sent to the client. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4194 This flag is usually set when sending a stream of data, for example from a |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4195 proxied server, and the entire response is not available in one buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4196 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4197 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4198 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4199 <literal>main_filter_need_in_memory</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4200 <literal>filter_need_in_memory</literal> — Flags |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4201 requesting that the output produced in memory buffers rather than files. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4202 This is a signal to the copy filter to read data from file buffers even if |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4203 sendfile is enabled. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4204 The difference between the two flags is the location of the filter modules that |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4205 set them. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4206 Filters called before the postpone filter in the filter chain set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4207 <literal>filter_need_in_memory</literal>, requesting that only the current |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4208 request output come in memory buffers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4209 Filters called later in the filter chain set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4210 <literal>main_filter_need_in_memory</literal>, requesting that |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4211 both the main request and all subrequests read files in memory |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4212 while sending output. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4213 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4214 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4215 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4216 <literal>filter_need_temporary</literal> — Flag requesting that the request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4217 output be produced in temporary buffers, but not in readonly memory buffers or |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4218 file buffers. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4219 This is used by filters which may change output directly in the buffers where |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4220 it's sent.</listitem> |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4221 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4222 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4223 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4224 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4225 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4226 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4227 <section name="Configuration" id="http_conf"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4228 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4229 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4230 Each HTTP module can have three types of configuration: |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4231 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4232 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4233 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4234 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4235 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4236 Main configuration — Applies to the entire <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4237 Functions as global settings for a module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4238 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4239 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4240 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4241 Server configuration — Applies to a single <literal>server</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4242 Functions as server-specific settings for a module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4243 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4244 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4245 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4246 Location configuration — Applies to a single <literal>location</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4247 <literal>if</literal> or <literal>limit_except</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4248 Functions as location-specific settings for a module. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4249 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4250 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4251 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4252 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4253 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4254 Configuration structures are created at the nginx configuration stage by |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4255 calling functions, which allocate the structures, initialize them |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4256 and merge them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4257 The following example shows how to create a simple location |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4258 configuration for a module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4259 The configuration has one setting, <literal>foo</literal>, of type |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4260 unsigned integer. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4261 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4262 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4263 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4264 typedef struct { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4265 ngx_uint_t foo; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4266 } ngx_http_foo_loc_conf_t; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4267 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4268 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4269 static ngx_http_module_t ngx_http_foo_module_ctx = { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4270 NULL, /* preconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4271 NULL, /* postconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4272 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4273 NULL, /* create main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4274 NULL, /* init main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4275 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4276 NULL, /* create server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4277 NULL, /* merge server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4278 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4279 ngx_http_foo_create_loc_conf, /* create location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4280 ngx_http_foo_merge_loc_conf /* merge location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4281 }; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4282 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4283 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4284 static void * |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4285 ngx_http_foo_create_loc_conf(ngx_conf_t *cf) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4286 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4287 ngx_http_foo_loc_conf_t *conf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4288 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4289 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_foo_loc_conf_t)); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4290 if (conf == NULL) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4291 return NULL; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4292 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4293 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4294 conf->foo = NGX_CONF_UNSET_UINT; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4295 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4296 return conf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4297 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4298 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4299 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4300 static char * |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4301 ngx_http_foo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4302 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4303 ngx_http_foo_loc_conf_t *prev = parent; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4304 ngx_http_foo_loc_conf_t *conf = child; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4305 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4306 ngx_conf_merge_uint_value(conf->foo, prev->foo, 1); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4307 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4308 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4309 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4310 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4311 As seen in the example, the <literal>ngx_http_foo_create_loc_conf()</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4312 function creates a new configuration structure, and |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4313 <literal>ngx_http_foo_merge_loc_conf()</literal> merges a configuration with |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4314 configuration from a higher level. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4315 In fact, server and location configuration do not exist only at the server and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4316 location levels, but are also created for all levels above them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4317 Specifically, a server configuration is also created at the main level and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4318 location configurations are created at the main, server, and location levels. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4319 These configurations make it possible to specify server- and location-specific |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4320 settings at any level of an nginx configuration file. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4321 Eventually configurations are merged down. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4322 A number of macros like <literal>NGX_CONF_UNSET</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4323 <literal>NGX_CONF_UNSET_UINT</literal> are provided |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4324 for indicating a missing setting and ignoring it while merging. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4325 Standard nginx merge macros like <literal>ngx_conf_merge_value()</literal> and |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4326 <literal>ngx_conf_merge_uint_value()</literal> provide a convenient way to |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4327 merge a setting and set the default value if none of the configurations |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4328 provided an explicit value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4329 For complete list of macros for different types, see |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
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1928
diff
changeset
|
4330 <literal>src/core/ngx_conf_file.h</literal>. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4331 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4332 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4333 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4334 The following macros are available. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4335 for accessing configuration for HTTP modules at configuration time. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4336 They all take <literal>ngx_conf_t</literal> reference as the first argument. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4337 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4338 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4339 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4340 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4341 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4342 <literal>ngx_http_conf_get_module_main_conf(cf, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4343 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4344 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4345 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4346 <literal>ngx_http_conf_get_module_srv_conf(cf, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4347 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4348 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4349 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4350 <literal>ngx_http_conf_get_module_loc_conf(cf, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4351 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4352 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4353 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4354 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4355 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4356 The following example gets a pointer to a location configuration of |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4357 standard nginx core module |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4358 <link doc="../http/ngx_http_core_module.xml">ngx_http_core_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4359 and replaces the location content handler kept |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4360 in the <literal>handler</literal> field of the structure. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4361 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4362 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4363 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4364 static ngx_int_t ngx_http_foo_handler(ngx_http_request_t *r); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4365 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4366 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4367 static ngx_command_t ngx_http_foo_commands[] = { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4368 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4369 { ngx_string("foo"), |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4370 NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4371 ngx_http_foo, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4372 0, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4373 0, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4374 NULL }, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4375 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4376 ngx_null_command |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4377 }; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4378 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4379 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4380 static char * |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4381 ngx_http_foo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4382 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4383 ngx_http_core_loc_conf_t *clcf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4384 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4385 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4386 clcf->handler = ngx_http_bar_handler; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4387 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4388 return NGX_CONF_OK; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4389 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4390 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4391 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4392 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4393 The following macros are available for accessing configuration for HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4394 modules at runtime. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4395 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4396 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4397 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4398 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4399 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4400 <literal>ngx_http_get_module_main_conf(r, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4401 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4402 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4403 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4404 <literal>ngx_http_get_module_srv_conf(r, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4405 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4406 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4407 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4408 <literal>ngx_http_get_module_loc_conf(r, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4409 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4410 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4411 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4412 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4413 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4414 These macros receive a reference to an HTTP request |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4415 <literal>ngx_http_request_t</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4416 The main configuration of a request never changes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4417 Server configuration can change from the default after |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4418 the virtual server for the request is chosen. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4419 Location configuration selected for processing a request can change multiple |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4420 times as a result of a rewrite operation or internal redirect. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4421 The following example shows how to access a module's HTTP configuration at |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4422 runtime. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4423 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4424 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4425 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4426 static ngx_int_t |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4427 ngx_http_foo_handler(ngx_http_request_t *r) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4428 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4429 ngx_http_foo_loc_conf_t *flcf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4430 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4431 flcf = ngx_http_get_module_loc_conf(r, ngx_http_foo_module); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4432 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4433 ... |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4434 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4435 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4436 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4437 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4438 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4439 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4440 <section name="Phases" id="http_phases"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4441 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4442 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4443 Each HTTP request passes through a sequence of phases. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4444 In each phase a distinct type of processing is performed on the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4445 Module-specific handlers can be registered in most phases, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4446 and many standard nginx modules register their phase handlers as a way |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4447 to get called at a specific stage of request processing. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4448 Phases are processed successively and the phase handlers are called |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4449 once the request reaches the phase. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4450 Following is the list of nginx HTTP phases. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4451 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4452 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4453 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4454 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4455 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4456 <literal>NGX_HTTP_POST_READ_PHASE</literal> — First phase. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4457 The <link doc="../http/ngx_http_realip_module.xml">ngx_http_realip_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4458 registers its handler at this phase to enable |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4459 substitution of client addresses before any other module is invoked. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4460 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4461 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4462 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4463 <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal> — Phase where |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4464 rewrite directives defined in a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4465 (but outside a <literal>location</literal> block) are processed. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4466 The |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4467 <link doc="../http/ngx_http_rewrite_module.xml">ngx_http_rewrite_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4468 installs its handler at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4469 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4470 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4471 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4472 <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> — Special phase |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4473 where a location is chosen based on the request URI. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4474 Before this phase, the default location for the relevant virtual server |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4475 is assigned to the request, and any module requesting a location configuration |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4476 receives the configuration for the default server location. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4477 This phase a assigns a new location to the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4478 No additional handlers can be registered at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4479 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4480 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4481 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4482 <literal>NGX_HTTP_REWRITE_PHASE</literal> — Same as |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4483 <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal>, but for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4484 rewrite rules defined in the location, chosen in the previous phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4485 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4486 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4487 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4488 <literal>NGX_HTTP_POST_REWRITE_PHASE</literal> — Special phase |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4489 where the request is redirected to a new location if its URI changed |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4490 during a rewrite. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4491 This is implemented by the request going through |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4492 the <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> again. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4493 No additional handlers can be registered at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4494 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4495 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4496 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4497 <literal>NGX_HTTP_PREACCESS_PHASE</literal> — A common phase for different |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4498 types of handlers, not associated with access control. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4499 The standard nginx modules |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4500 <link doc="../http/ngx_http_limit_conn_module.xml">ngx_http_limit_conn_module |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4501 </link> and |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4502 <link doc="../http/ngx_http_limit_req_module.xml"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4503 ngx_http_limit_req_module</link> register their handlers at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4504 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4505 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4506 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4507 <literal>NGX_HTTP_ACCESS_PHASE</literal> — Phase where it is verified |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4508 that the client is authorized to make the request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4509 Standard nginx modules such as |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4510 <link doc="../http/ngx_http_access_module.xml">ngx_http_access_module</link> and |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4511 <link doc="../http/ngx_http_auth_basic_module.xml">ngx_http_auth_basic_module |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4512 </link> register their handlers at this phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4513 By default the client must pass the authorization check of all handlers |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4514 registered at this phase for the request to continue to the next phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4515 The <link doc="../http/ngx_http_core_module.xml" id="satisfy"/> directive, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4516 can be used to permit processing to continue if any of the phase handlers |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4517 authorizes the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4518 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4519 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4520 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4521 <literal>NGX_HTTP_POST_ACCESS_PHASE</literal> — Special phase where the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4522 <link doc="../http/ngx_http_core_module.xml" id="satisfy">satisfy any</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4523 directive is processed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4524 If some access phase handlers denied access and none explictly allowed it, the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4525 request is finalized. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4526 No additional handlers can be registered at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4527 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4528 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4529 <listitem> |
2024
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4530 <literal>NGX_HTTP_PRECONTENT_PHASE</literal> — Phase for handlers to be called |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4531 prior to generating content. |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4532 Standard modules such as |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4533 <link doc="../http/ngx_http_core_module.xml" id="try_files"> |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4534 ngx_http_try_files_module</link> and |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4535 <link doc="../http/ngx_http_mirror_module.xml">ngx_http_mirror_module</link> |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4536 register their handlers at this phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4537 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4538 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4539 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4540 <literal>NGX_HTTP_CONTENT_PHASE</literal> — Phase where the response |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4541 is normally generated. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4542 Multiple nginx standard modules register their handlers at this phase, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4543 including |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4544 <link doc="../http/ngx_http_index_module.xml">ngx_http_index_module</link> or |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4545 <literal>ngx_http_static_module</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4546 They are called sequentially until one of them produces |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4547 the output. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4548 It's also possible to set content handlers on a per-location basis. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4549 If the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4550 <link doc="../http/ngx_http_core_module.xml">ngx_http_core_module</link>'s |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4551 location configuration has <literal>handler</literal> set, it is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4552 called as the content handler and the handlers installed at this phase |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4553 are ignored. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4554 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4555 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4556 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4557 <literal>NGX_HTTP_LOG_PHASE</literal> — Phase where request logging |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4558 is performed. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4559 Currently, only the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4560 <link doc="../http/ngx_http_log_module.xml">ngx_http_log_module</link> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4561 registers its handler |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4562 at this stage for access logging. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4563 Log phase handlers are called at the very end of request processing, right |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4564 before freeing the request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4565 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4566 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4567 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4568 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4569 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4570 Following is the example of a preaccess phase handler. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4571 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4572 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4573 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4574 static ngx_http_module_t ngx_http_foo_module_ctx = { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4575 NULL, /* preconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4576 ngx_http_foo_init, /* postconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4577 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4578 NULL, /* create main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4579 NULL, /* init main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4580 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4581 NULL, /* create server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4582 NULL, /* merge server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4583 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4584 NULL, /* create location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4585 NULL /* merge location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4586 }; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4587 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4588 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4589 static ngx_int_t |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4590 ngx_http_foo_handler(ngx_http_request_t *r) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4591 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4592 ngx_str_t *ua; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4593 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4594 ua = r->headers_in->user_agent; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4595 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4596 if (ua == NULL) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4597 return NGX_DECLINED; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4598 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4599 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4600 /* reject requests with "User-Agent: foo" */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4601 if (ua->value.len == 3 && ngx_strncmp(ua->value.data, "foo", 3) == 0) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4602 return NGX_HTTP_FORBIDDEN; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4603 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4604 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4605 return NGX_DECLINED; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4606 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4607 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4608 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4609 static ngx_int_t |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4610 ngx_http_foo_init(ngx_conf_t *cf) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4611 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4612 ngx_http_handler_pt *h; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4613 ngx_http_core_main_conf_t *cmcf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4614 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4615 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4616 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4617 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4618 if (h == NULL) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4619 return NGX_ERROR; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4620 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4621 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4622 *h = ngx_http_foo_handler; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4623 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4624 return NGX_OK; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4625 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4626 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4627 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4628 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4629 Phase handlers are expected to return specific codes: |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4630 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4631 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4632 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4633 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4634 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4635 <literal>NGX_OK</literal> — Proceed to the next phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4636 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4637 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4638 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4639 <literal>NGX_DECLINED</literal> — Proceed to the next handler of the current |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4640 phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4641 If the current handler is the last in the current phase, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4642 move to the next phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4643 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4644 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4645 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4646 <literal>NGX_AGAIN</literal>, <literal>NGX_DONE</literal> — Suspend |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4647 phase handling until some future event which can be |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4648 an asynchronous I/O operation or just a delay, for example. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4649 It is assumed, that phase handling will be resumed later by calling |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4650 <literal>ngx_http_core_run_phases()</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4651 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4652 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4653 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4654 Any other value returned by the phase handler is treated as a request |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4655 finalization code, in particular, an HTTP response code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4656 The request is finalized with the code provided. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4657 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4658 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4659 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4660 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4661 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4662 For some phases, return codes are treated in a slightly different way. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4663 At the content phase, any return code other that |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4664 <literal>NGX_DECLINED</literal> is considered a finalization code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4665 Any return code from the location content handlers is considered a |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4666 finalization code. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4667 At the access phase, in |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4668 <link doc="../http/ngx_http_core_module.xml" id="satisfy">satisfy any</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4669 mode, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4670 any return code other than <literal>NGX_OK</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4671 <literal>NGX_DECLINED</literal>, <literal>NGX_AGAIN</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4672 <literal>NGX_DONE</literal> is considered a denial. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4673 If no subsequent access handlers allow or deny access with a different |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4674 code, the denial code will become the finalization code. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4675 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4676 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4677 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4678 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
4679 |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4680 <section name="Variables" id="http_variables"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4681 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4682 <section name="Accessing existing variables" id="http_existing_variables"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4683 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4684 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4685 Variables can be referenced by index (this is the most common method) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4686 or name (see <link id="http_creating_variables">below</link>). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4687 The index is created at configuration stage, when a variable is added |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4688 to the configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4689 To obtain the variable index, use |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4690 <literal>ngx_http_get_variable_index()</literal>: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4691 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4692 ngx_str_t name; /* ngx_string("foo") */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4693 ngx_int_t index; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4694 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4695 index = ngx_http_get_variable_index(cf, &name); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4696 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4697 Here, <literal>cf</literal> is a pointer to nginx configuration and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4698 <literal>name</literal> points to a string containing the variable name. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4699 The function returns <literal>NGX_ERROR</literal> on error or a valid index |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4700 otherwise, which is typically stored somewhere in the module's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4701 configuration for future use. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4702 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4703 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4704 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4705 All HTTP variables are evaluated in the context of a given HTTP request, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4706 and results are specific to and cached in that HTTP request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4707 All functions that evaluate variables return the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4708 <literal>ngx_http_variable_value_t</literal> type, representing |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4709 the variable value: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4710 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4711 typedef ngx_variable_value_t ngx_http_variable_value_t; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4712 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4713 typedef struct { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4714 unsigned len:28; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4715 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4716 unsigned valid:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4717 unsigned no_cacheable:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4718 unsigned not_found:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4719 unsigned escape:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4720 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4721 u_char *data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4722 } ngx_variable_value_t; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4723 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4724 where: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4725 <list type="bullet"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4726 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4727 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4728 <literal>len</literal> — The length of the value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4729 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4730 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4731 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4732 <literal>data</literal> — The value itself |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4733 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4734 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4735 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4736 <literal>valid</literal> — The value is valid |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4737 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4738 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4739 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4740 <literal>not_found</literal> — The variable was not found and thus |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4741 the <literal>data</literal> and <literal>len</literal> fields are irrelevant; |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4742 this can happen, for example, with variables like <var>$arg_foo</var> |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4743 when a corresponding argument was not passed in a request |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4744 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4745 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4746 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4747 <literal>no_cacheable</literal> — Do not cache result |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4748 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4749 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4750 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4751 <literal>escape</literal> — Used internally by the logging module to mark |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4752 values that require escaping on output. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4753 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4754 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4755 </list> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4756 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4757 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4758 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4759 The <literal>ngx_http_get_flushed_variable()</literal> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4760 and <literal>ngx_http_get_indexed_variable()</literal> functions |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4761 are used to obtain the value of a variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4762 They have the same interface - accepting an HTTP request <literal>r</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4763 as a context for evaluating the variable and an <literal>index</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4764 that identifies it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4765 An example of typical usage: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4766 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4767 ngx_http_variable_value_t *v; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4768 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4769 v = ngx_http_get_flushed_variable(r, index); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4770 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4771 if (v == NULL || v->not_found) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4772 /* we failed to get value or there is no such variable, handle it */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4773 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4774 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4775 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4776 /* some meaningful value is found */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4777 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4778 The difference between functions is that the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4779 <literal>ngx_http_get_indexed_variable()</literal> returns a cached value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4780 and <literal>ngx_http_get_flushed_variable()</literal> flushes the cache for |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4781 non-cacheable variables. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4782 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4783 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4784 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4785 Some modules, such as SSI and Perl, need to deal with variables for which the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4786 name is not known at configuration time. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4787 An index therefore cannot be used to access them, but the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4788 <literal>ngx_http_get_variable(r, name, key)</literal> function |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4789 is available. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4790 It searches for a variable with a given |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4791 <literal>name</literal> and its hash <literal>key</literal> derived |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4792 from the name. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4793 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4794 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4795 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4796 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4797 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4798 <section name="Creating variables" id="http_creating_variables"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4799 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4800 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4801 To create a variable, use the <literal>ngx_http_add_variable()</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4802 function. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4803 It takes as arguments a configuration (where the variable is registered), |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4804 the variable name and flags that control the function's behaviour: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4805 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4806 <list type="bullet"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4807 <listitem><literal>NGX_HTTP_VAR_CHANGEABLE</literal> — Enables redefinition of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4808 the variable: there is no conflict if another module defines a variable with |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4809 the same name. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4810 This allows the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4811 <link doc="../http/ngx_http_rewrite_module.xml" id="set"/> directive |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4812 to override variables. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4813 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4814 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4815 <listitem><literal>NGX_HTTP_VAR_NOCACHEABLE</literal> — Disables caching, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4816 which is useful for variables such as <literal>$time_local</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4817 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4818 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4819 <listitem><literal>NGX_HTTP_VAR_NOHASH</literal> — Indicates that |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4820 this variable is only accessible by index, not by name. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4821 This is a small optimization for use when it is known that the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4822 variable is not needed in modules like SSI or Perl. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4823 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4824 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4825 <listitem><literal>NGX_HTTP_VAR_PREFIX</literal> — The name of the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4826 variable is a prefix. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4827 In this case, a handler must implement additional logic to obtain the value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4828 of a specific variable. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4829 For example, all “<literal>arg_</literal>” variables are processed by the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4830 same handler, which performs lookup in request arguments and returns the value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4831 of a specific argument. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4832 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4833 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4834 </list> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4835 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4836 The function returns NULL in case of error or a pointer to |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4837 <literal>ngx_http_variable_t</literal> otherwise: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4838 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4839 struct ngx_http_variable_s { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4840 ngx_str_t name; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4841 ngx_http_set_variable_pt set_handler; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4842 ngx_http_get_variable_pt get_handler; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4843 uintptr_t data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4844 ngx_uint_t flags; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4845 ngx_uint_t index; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4846 }; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4847 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4848 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4849 The <literal>get</literal> and <literal>set</literal> handlers |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4850 are called to obtain or set the variable value, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4851 <literal>data</literal> is passed to variable handlers, and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4852 <literal>index</literal> holds assigned variable index used to reference |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4853 the variable. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4854 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4855 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4856 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4857 Usually, a null-terminated static array of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4858 <literal>ngx_http_variable_t</literal> structures is created |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4859 by a module and processed at the preconfiguration stage to add variables |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4860 into the configuration, for example: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4861 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4862 static ngx_http_variable_t ngx_http_foo_vars[] = { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4863 |
2009
9b7302e3b21f
DevGuide: fixed variables example.
Vladimir Homutov <vl@nginx.com>
parents:
2008
diff
changeset
|
4864 { ngx_string("foo_v1"), NULL, ngx_http_foo_v1_variable, 0, 0, 0 }, |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4865 |
2023
ec34516cbd1b
DevGuide: documented macros for null variables.
Vladimir Homutov <vl@nginx.com>
parents:
2009
diff
changeset
|
4866 ngx_http_null_variable |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4867 }; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4868 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4869 static ngx_int_t |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4870 ngx_http_foo_add_variables(ngx_conf_t *cf) |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4871 { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4872 ngx_http_variable_t *var, *v; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4873 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4874 for (v = ngx_http_foo_vars; v->name.len; v++) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4875 var = ngx_http_add_variable(cf, &v->name, v->flags); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4876 if (var == NULL) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4877 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4878 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4879 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4880 var->get_handler = v->get_handler; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4881 var->data = v->data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4882 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4883 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4884 return NGX_OK; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4885 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4886 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4887 This function in the example is used to initialize |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4888 the <literal>preconfiguration</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4889 field of the HTTP module context and is called before the parsing of HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4890 configuration, so that the parser can refer to these variables. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4891 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4892 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4893 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4894 The <literal>get</literal> handler is responsible for evaluating a variable |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4895 in the context of a specific request, for example: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4896 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4897 static ngx_int_t |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4898 ngx_http_variable_connection(ngx_http_request_t *r, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4899 ngx_http_variable_value_t *v, uintptr_t data) |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4900 { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4901 u_char *p; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4902 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4903 p = ngx_pnalloc(r->pool, NGX_ATOMIC_T_LEN); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4904 if (p == NULL) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4905 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4906 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4907 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4908 v->len = ngx_sprintf(p, "%uA", r->connection->number) - p; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4909 v->valid = 1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4910 v->no_cacheable = 0; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4911 v->not_found = 0; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4912 v->data = p; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4913 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4914 return NGX_OK; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4915 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4916 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4917 It returns <literal>NGX_ERROR</literal> in case of internal error |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4918 (for example, failed memory allocation) or <literal>NGX_OK</literal> otherwise. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4919 To learn the status of variable evaluation, inspect the flags |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4920 in <literal>ngx_http_variable_value_t</literal> (see the description |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4921 <link id="http_existing_variables">above</link>). |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4922 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4923 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4924 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4925 The <literal>set</literal> handler allows setting the property |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4926 referenced by the variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4927 For example, the set handler of the <literal>$limit_rate</literal> variable |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4928 modifies the request's <literal>limit_rate</literal> field: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4929 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4930 ... |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4931 { ngx_string("limit_rate"), ngx_http_variable_request_set_size, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4932 ngx_http_variable_request_get_size, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4933 offsetof(ngx_http_request_t, limit_rate), |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4934 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 }, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4935 ... |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4936 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4937 static void |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4938 ngx_http_variable_request_set_size(ngx_http_request_t *r, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4939 ngx_http_variable_value_t *v, uintptr_t data) |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4940 { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4941 ssize_t s, *sp; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4942 ngx_str_t val; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4943 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4944 val.len = v->len; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4945 val.data = v->data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4946 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4947 s = ngx_parse_size(&val); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4948 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4949 if (s == NGX_ERROR) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4950 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4951 "invalid size \"%V\"", &val); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4952 return; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4953 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4954 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4955 sp = (ssize_t *) ((char *) r + data); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4956 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4957 *sp = s; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4958 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4959 return; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4960 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4961 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4962 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4963 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4964 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4965 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4966 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4967 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4968 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4969 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4970 <section name="Complex values" id="http_complex_values"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4971 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4972 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4973 A complex value, despite its name, provides an easy way to evaluate |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4974 expressions which can contain text, variables, and their combination. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4975 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4976 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4977 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4978 The complex value description in |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4979 <literal>ngx_http_compile_complex_value</literal> is compiled at the |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4980 configuration stage into <literal>ngx_http_complex_value_t</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4981 which is used at runtime to obtain results of expression evaluation. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4982 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4983 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4984 ngx_str_t *value; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4985 ngx_http_complex_value_t cv; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4986 ngx_http_compile_complex_value_t ccv; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4987 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4988 value = cf->args->elts; /* directive arguments */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4989 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4990 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4991 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4992 ccv.cf = cf; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4993 ccv.value = &value[1]; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4994 ccv.complex_value = &cv; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4995 ccv.zero = 1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4996 ccv.conf_prefix = 1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4997 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4998 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4999 return NGX_CONF_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5000 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5001 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5002 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5003 Here, <literal>ccv</literal> holds all parameters that are required to |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5004 initialize the complex value <literal>cv</literal>: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5005 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5006 <list type="bullet"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5007 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5008 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5009 <literal>cf</literal> — Configuration pointer |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5010 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5011 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5012 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5013 <literal>value</literal> — String to be parsed (input) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5014 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5015 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5016 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5017 <literal>complex_value</literal> — Compiled value (output) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5018 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5019 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5020 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5021 <literal>zero</literal> — Flag that enables zero-terminating value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5022 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5023 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5024 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5025 <literal>conf_prefix</literal> — Prefixes the result with the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5026 configuration prefix (the directory where nginx is currently looking for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5027 configuration) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5028 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5029 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5030 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5031 <literal>root_prefix</literal> — Prefixes the result with the root prefix |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5032 (the normal nginx installation prefix) |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5033 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5034 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5035 </list> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5036 The <literal>zero</literal> flag is useful when results are to be passed to |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5037 libraries that require zero-terminated strings, and prefixes are handy when |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5038 dealing with filenames. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5039 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5040 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5041 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5042 Upon successful compilation, <literal>cv.lengths</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5043 contains information about the presence of variables |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5044 in the expression. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5045 The NULL value means that the expression contained static text only, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5046 and so can be stored in a simple string rather than as a complex value. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5047 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5048 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5049 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5050 The <literal>ngx_http_set_complex_value_slot()</literal> is a convenient |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5051 function used to initialize a complex value completely in the directive |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5052 declaration itself. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5053 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5054 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5055 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5056 At runtime, a complex value can be calculated using the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5057 <literal>ngx_http_complex_value()</literal> function: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5058 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5059 ngx_str_t res; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5060 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5061 if (ngx_http_complex_value(r, &cv, &res) != NGX_OK) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5062 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5063 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5064 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5065 Given the request <literal>r</literal> and previously compiled |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5066 value <literal>cv</literal>, the function evaluates the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5067 expression and writes the result to <literal>res</literal>. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5068 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5069 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5070 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5071 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5072 |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5073 <section name="Request redirection" id="http_request_redirection"> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5074 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5075 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5076 An HTTP request is always connected to a location via the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5077 <literal>loc_conf</literal> field of the <literal>ngx_http_request_t</literal> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5078 structure. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5079 This means that at any point the location configuration of any module can be |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5080 retrieved from the request by calling |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5081 <literal>ngx_http_get_module_loc_conf(r, module)</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5082 Request location can change several times during the request's lifetime. |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5083 Initially, a default server location of the default server is assigned to a |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5084 request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5085 If the request switches to a different server (chosen by the HTTP |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5086 <header>Host</header> header or SSL SNI extension), the request switches to the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5087 default location of that server as well. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5088 The next change of the location takes place at the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5089 <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> request phase. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5090 At this phase a location is chosen by request URI among all non-named locations |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5091 configured for the server. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5092 The |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5093 <link doc="../http/ngx_http_rewrite_module.xml">ngx_http_rewrite_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5094 can change the request URI at the |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5095 <literal>NGX_HTTP_REWRITE_PHASE</literal> request phase as a result of |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5096 the <link doc="../http/ngx_http_rewrite_module.xml" id="rewrite">rewrite</link> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5097 directive and send the request back |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5098 to the <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> phase for selection of a |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5099 new location based on the new URI. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5100 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5101 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5102 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5103 It is also possible to redirect a request to a new location at any point by |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5104 calling one of |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5105 <literal>ngx_http_internal_redirect(r, uri, args)</literal> or |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5106 <literal>ngx_http_named_location(r, name)</literal>. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5107 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5108 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5109 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5110 The <literal>ngx_http_internal_redirect(r, uri, args)</literal> function changes |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5111 the request URI and returns the request to the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5112 <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal> phase. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5113 The request proceeds with a server default location. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5114 Later at <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> a new location is chosen |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5115 based on the new request URI. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5116 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5117 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5118 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5119 The following example performs an internal redirect with the new request |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5120 arguments. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5121 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5122 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5123 <programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5124 ngx_int_t |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5125 ngx_http_foo_redirect(ngx_http_request_t *r) |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5126 { |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5127 ngx_str_t uri, args; |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5128 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5129 ngx_str_set(&uri, "/foo"); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5130 ngx_str_set(&args, "bar=1"); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5131 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5132 return ngx_http_internal_redirect(r, &uri, &args); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5133 } |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5134 </programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5135 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5136 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5137 The function <literal>ngx_http_named_location(r, name)</literal> redirects |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5138 a request to a named location. The name of the location is passed as the |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5139 argument. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5140 The location is looked up among all named locations of the current |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5141 server, after which the requests switches to the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5142 <literal>NGX_HTTP_REWRITE_PHASE</literal> phase. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5143 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5144 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5145 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5146 The following example performs a redirect to a named location @foo. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5147 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5148 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5149 <programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5150 ngx_int_t |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5151 ngx_http_foo_named_redirect(ngx_http_request_t *r) |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5152 { |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5153 ngx_str_t name; |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5154 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5155 ngx_str_set(&name, "foo"); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5156 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5157 return ngx_http_named_location(r, &name); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5158 } |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5159 </programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5160 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5161 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5162 Both functions - <literal>ngx_http_internal_redirect(r, uri, args)</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5163 and <literal>ngx_http_named_location(r, name)</literal> can be called when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5164 nginx modules have already stored some contexts in a request's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5165 <literal>ctx</literal> field. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5166 It's possible for these contexts to become inconsistent with the new |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5167 location configuration. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5168 To prevent inconsistency, all request contexts are |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5169 erased by both redirect functions. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5170 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5171 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5172 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5173 Calling <literal>ngx_http_internal_redirect(r, uri, args)</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5174 or <literal>ngx_http_named_location(r, name)</literal> increases the request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5175 <literal>count</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5176 For consistent request reference counting, call |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5177 <literal>ngx_http_finalize_request(r, NGX_DONE)</literal> after redirecting the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5178 request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5179 This will finalize current request code path and decrease the counter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5180 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5181 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5182 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5183 Redirected and rewritten requests become internal and can access the |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5184 <link doc="../http/ngx_http_core_module.xml" id="internal">internal</link> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5185 locations. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5186 Internal requests have the <literal>internal</literal> flag set. |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5187 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5188 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5189 </section> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5190 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5191 |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5192 <section name="Subrequests" id="http_subrequests"> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5193 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5194 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5195 Subrequests are primarily used to insert output of one request into another, |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5196 possibly mixed with other data. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5197 A subrequest looks like a normal request, but shares some data with its parent. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5198 In particular, all fields related to client input are shared |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5199 because a subrequest does not receive any other input from the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5200 The request field <literal>parent</literal> for a subrequest contains a link |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5201 to its parent request and is NULL for the main request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5202 The field <literal>main</literal> contains a link to the main request in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5203 a group of requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5204 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5205 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5206 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5207 A subrequest starts in the <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5208 phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5209 It passes through the same subsequent phases as a normal request and is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5210 assigned a location based on its own URI. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5211 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5212 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5213 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5214 The output header in a subrequest is always ignored. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5215 The <literal>ngx_http_postpone_filter</literal> places the subrequest's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5216 output body in the right position relative to other data produced |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5217 by the parent request. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5218 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5219 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5220 <para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5221 Subrequests are related to the concept of active requests. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5222 A request <literal>r</literal> is considered active if |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5223 <literal>c->data == r</literal>, where <literal>c</literal> is the client |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5224 connection object. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5225 At any given point, only the active request in a request group is allowed |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5226 to output its buffers to the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5227 An inactive request can still send its output to the filter chain, but it |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5228 does not pass beyond the <literal>ngx_http_postpone_filter</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5229 remains buffered by that filter until the request becomes active. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5230 Here are some rules of request activation: |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5231 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5232 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5233 <list type="bullet"> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5234 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5235 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5236 Initially, the main request is active. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5237 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5238 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5239 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5240 The first subrequest of an active request becomes active right after creation. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5241 </listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5242 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5243 <listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5244 The <literal>ngx_http_postpone_filter</literal> activates the next request |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5245 in the active request's subrequest list, once all data prior to that request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5246 are sent. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5247 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5248 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5249 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5250 When a request is finalized, its parent is activated. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5251 </listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5252 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5253 </list> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5254 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5255 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5256 Create a subrequest by calling the function |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5257 <literal>ngx_http_subrequest(r, uri, args, psr, ps, flags)</literal>, where |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5258 <literal>r</literal> is the parent request, <literal>uri</literal> and |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5259 <literal>args</literal> are the URI and arguments of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5260 subrequest, <literal>psr</literal> is the output parameter, which receives the |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5261 newly created subrequest reference, <literal>ps</literal> is a callback object |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5262 for notifying the parent request that the subrequest is being finalized, and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5263 <literal>flags</literal> is bitmask of flags. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5264 The following flags are available: |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5265 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5266 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5267 <list type="bullet"> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5268 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5269 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5270 <literal>NGX_HTTP_SUBREQUEST_IN_MEMORY</literal> - Output is not |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5271 sent to the client, but rather stored in memory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5272 The flag only affects subrequests which are processed by one of the proxying |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5273 modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5274 After a subrequest is finalized its output is available in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5275 a <literal>r->upstream->buffer</literal> of type <literal>ngx_buf_t</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5276 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5277 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5278 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5279 <literal>NGX_HTTP_SUBREQUEST_WAITED</literal> - The subrequest's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5280 <literal>done</literal> flag is set even if the subrequest is not active when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5281 it is finalized. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5282 This subrequest flag is used by the SSI filter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5283 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5284 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5285 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5286 <literal>NGX_HTTP_SUBREQUEST_CLONE</literal> - The subrequest is created as a |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5287 clone of its parent. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5288 It is started at the same location and proceeds from the same phase as the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5289 parent request. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5290 </listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5291 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5292 </list> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5293 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5294 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5295 The following example creates a subrequest with the URI |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5296 of <literal>/foo</literal>. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5297 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5298 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5299 <programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5300 ngx_int_t rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5301 ngx_str_t uri; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5302 ngx_http_request_t *sr; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5303 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5304 ... |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5305 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5306 ngx_str_set(&uri, "/foo"); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5307 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5308 rc = ngx_http_subrequest(r, &uri, NULL, &sr, NULL, 0); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5309 if (rc == NGX_ERROR) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5310 /* error */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5311 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5312 </programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5313 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5314 <para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5315 This example clones the current request and sets a finalization callback for the |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5316 subrequest. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5317 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5318 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5319 <programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5320 ngx_int_t |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5321 ngx_http_foo_clone(ngx_http_request_t *r) |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5322 { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5323 ngx_http_request_t *sr; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5324 ngx_http_post_subrequest_t *ps; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5325 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5326 ps = ngx_palloc(r->pool, sizeof(ngx_http_post_subrequest_t)); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5327 if (ps == NULL) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5328 return NGX_ERROR; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5329 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5330 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5331 ps->handler = ngx_http_foo_subrequest_done; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5332 ps->data = "foo"; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5333 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5334 return ngx_http_subrequest(r, &r->uri, &r->args, &sr, ps, |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5335 NGX_HTTP_SUBREQUEST_CLONE); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5336 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5337 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5338 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5339 ngx_int_t |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5340 ngx_http_foo_subrequest_done(ngx_http_request_t *r, void *data, ngx_int_t rc) |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5341 { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5342 char *msg = (char *) data; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5343 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5344 ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5345 "done subrequest r:%p msg:%s rc:%i", r, msg, rc); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5346 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5347 return rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5348 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5349 </programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5350 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5351 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5352 Subrequests are normally created in a body filter, in which case their output |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5353 can be treated like the output from any explicit request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5354 This means that eventually the output of a subrequest is sent to the client, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5355 after all explicit buffers that are passed before subrequest creation and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5356 before any buffers that are passed after creation. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5357 This ordering is preserved even for large hierarchies of subrequests. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5358 The following example inserts output from a subrequest after all request data |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5359 buffers, but before the final buffer with the <literal>last_buf</literal> flag. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5360 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5361 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5362 <programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5363 ngx_int_t |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5364 ngx_http_foo_body_filter(ngx_http_request_t *r, ngx_chain_t *in) |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5365 { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5366 ngx_int_t rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5367 ngx_buf_t *b; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5368 ngx_uint_t last; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5369 ngx_chain_t *cl, out; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5370 ngx_http_request_t *sr; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5371 ngx_http_foo_filter_ctx_t *ctx; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5372 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5373 ctx = ngx_http_get_module_ctx(r, ngx_http_foo_filter_module); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5374 if (ctx == NULL) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5375 return ngx_http_next_body_filter(r, in); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5376 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5377 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5378 last = 0; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5379 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5380 for (cl = in; cl; cl = cl->next) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5381 if (cl->buf->last_buf) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5382 cl->buf->last_buf = 0; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5383 cl->buf->last_in_chain = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5384 cl->buf->sync = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5385 last = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5386 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5387 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5388 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5389 /* Output explicit output buffers */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5390 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5391 rc = ngx_http_next_body_filter(r, in); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5392 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5393 if (rc == NGX_ERROR || !last) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5394 return rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5395 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5396 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5397 /* |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5398 * Create the subrequest. The output of the subrequest |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5399 * will automatically be sent after all preceding buffers, |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5400 * but before the last_buf buffer passed later in this function. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5401 */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5402 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5403 if (ngx_http_subrequest(r, ctx->uri, NULL, &sr, NULL, 0) != NGX_OK) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5404 return NGX_ERROR; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5405 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5406 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5407 ngx_http_set_ctx(r, NULL, ngx_http_foo_filter_module); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5408 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5409 /* Output the final buffer with the last_buf flag */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5410 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5411 b = ngx_calloc_buf(r->pool); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5412 if (b == NULL) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5413 return NGX_ERROR; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5414 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5415 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5416 b->last_buf = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5417 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5418 out.buf = b; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5419 out.next = NULL; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5420 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5421 return ngx_http_output_filter(r, &out); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5422 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5423 </programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5424 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5425 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5426 A subrequest can also be created for other purposes than data output. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5427 For example, the <link doc="../http/ngx_http_auth_request_module.xml"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5428 ngx_http_auth_request_module</link> module |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5429 creates a subrequest at the <literal>NGX_HTTP_ACCESS_PHASE</literal> phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5430 To disable output at this point, the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5431 <literal>header_only</literal> flag is set on the subrequest. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5432 This prevents the subrequest body from being sent to the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5433 Note that the subrequest's header is never sent to the client. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5434 The result of the subrequest can be analyzed in the callback handler. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5435 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5436 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5437 </section> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5438 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5439 |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5440 <section name="Request finalization" id="http_request_finalization"> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5441 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5442 <para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5443 An HTTP request is finalized by calling the function |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5444 <literal>ngx_http_finalize_request(r, rc)</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5445 It is usually finalized by the content handler after all output buffers |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5446 are sent to the filter chain. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5447 At this point all of the output might not be sent to the client, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5448 with some of it remaining buffered somewhere along the filter chain. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5449 If it is, the <literal>ngx_http_finalize_request(r, rc)</literal> function |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5450 automatically installs a special handler <literal>ngx_http_writer(r)</literal> |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5451 to finish sending the output. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5452 A request is also finalized in case of an error or if a standard HTTP response |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5453 code needs to be returned to the client. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5454 </para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5455 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5456 <para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5457 The function <literal>ngx_http_finalize_request(r, rc)</literal> expects the |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5458 following <literal>rc</literal> values: |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5459 </para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5460 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5461 <list type="bullet"> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5462 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5463 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5464 <literal>NGX_DONE</literal> - Fast finalization. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5465 Decrement the request <literal>count</literal> and destroy the request if it |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5466 reaches zero. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5467 The client connection can be used for more requests after the current request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5468 is destroyed. |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5469 </listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5470 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5471 <listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5472 <literal>NGX_ERROR</literal>, <literal>NGX_HTTP_REQUEST_TIME_OUT</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5473 (<literal>408</literal>), <literal>NGX_HTTP_CLIENT_CLOSED_REQUEST</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5474 (<literal>499</literal>) - Error finalization. |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5475 Terminate the request as soon as possible and close the client connection. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5476 </listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5477 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5478 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5479 <literal>NGX_HTTP_CREATED</literal> (<literal>201</literal>), |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5480 <literal>NGX_HTTP_NO_CONTENT</literal> (<literal>204</literal>), codes greater |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5481 than or equal to <literal>NGX_HTTP_SPECIAL_RESPONSE</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5482 (<literal>300</literal>) - Special response finalization. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5483 For these values nginx either sends to the client a default response page for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5484 the code or performs the internal redirect to an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5485 <link doc="../http/ngx_http_core_module.xml" id="error_page"/> location if that |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5486 is configured for the code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5487 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5488 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5489 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5490 Other codes are considered successful finalization codes and might activate the |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5491 request writer to finish sending the response body. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5492 Once the body is completely sent, the request <literal>count</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5493 is decremented. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5494 If it reaches zero, the request is destroyed, but the client connection can |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5495 still be used for other requests. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5496 If <literal>count</literal> is positive, there are unfinished activities |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5497 within the request, which will be finalized at a later point. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5498 </listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5499 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5500 </list> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5501 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5502 </section> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5503 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5504 |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5505 <section name="Request body" id="http_request_body"> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5506 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5507 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5508 For dealing with the body of a client request, nginx provides the |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5509 <literal>ngx_http_read_client_request_body(r, post_handler)</literal> and |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5510 <literal>ngx_http_discard_request_body(r)</literal> functions. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5511 The first function reads the request body and makes it available via the |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5512 <literal>request_body</literal> request field. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5513 The second function instructs nginx to discard (read and ignore) the request |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5514 body. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5515 One of these functions must be called for every request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5516 Normally, the content handler makes the call. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5517 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5518 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5519 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5520 Reading or discarding the client request body from a subrequest is not allowed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5521 It must always be done in the main request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5522 When a subrequest is created, it inherits the parent's |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5523 <literal>request_body</literal> object which can be used by the subrequest if |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5524 the main request has previously read the request body. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5525 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5526 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5527 <para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5528 The function |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5529 <literal>ngx_http_read_client_request_body(r, post_handler)</literal> starts |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5530 the process of reading the request body. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5531 When the body is completely read, the <literal>post_handler</literal> callback |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5532 is called to continue processing the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5533 If the request body is missing or has already been read, the callback is called |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5534 immediately. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5535 The function |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5536 <literal>ngx_http_read_client_request_body(r, post_handler)</literal> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5537 allocates the <literal>request_body</literal> request field of type |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5538 <literal>ngx_http_request_body_t</literal>. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5539 The field <literal>bufs</literal> of this object keeps the result as a buffer |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5540 chain. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5541 The body can be saved in memory buffers or file buffers, if the capacity |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5542 specified by the |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5543 <link doc="../http/ngx_http_core_module.xml" id="client_body_buffer_size"/> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5544 directive is not enough to fit the entire body in memory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5545 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5546 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5547 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5548 The following example reads a client request body and returns its size. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5549 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5550 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5551 <programlisting> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5552 ngx_int_t |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5553 ngx_http_foo_content_handler(ngx_http_request_t *r) |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5554 { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5555 ngx_int_t rc; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5556 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5557 rc = ngx_http_read_client_request_body(r, ngx_http_foo_init); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5558 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5559 if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5560 /* error */ |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5561 return rc; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5562 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5563 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5564 return NGX_DONE; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5565 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5566 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5567 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5568 void |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5569 ngx_http_foo_init(ngx_http_request_t *r) |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5570 { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5571 off_t len; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5572 ngx_buf_t *b; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5573 ngx_int_t rc; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5574 ngx_chain_t *in, out; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5575 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5576 if (r->request_body == NULL) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5577 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5578 return; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5579 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5580 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5581 len = 0; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5582 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5583 for (in = r->request_body->bufs; in; in = in->next) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5584 len += ngx_buf_size(in->buf); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5585 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5586 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5587 b = ngx_create_temp_buf(r->pool, NGX_OFF_T_LEN); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5588 if (b == NULL) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5589 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5590 return; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5591 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5592 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5593 b->last = ngx_sprintf(b->pos, "%O", len); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5594 b->last_buf = (r == r->main) ? 1: 0; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5595 b->last_in_chain = 1; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5596 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5597 r->headers_out.status = NGX_HTTP_OK; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5598 r->headers_out.content_length_n = b->last - b->pos; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5599 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5600 rc = ngx_http_send_header(r); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5601 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5602 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5603 ngx_http_finalize_request(r, rc); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5604 return; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5605 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5606 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5607 out.buf = b; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5608 out.next = NULL; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5609 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5610 rc = ngx_http_output_filter(r, &out); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5611 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5612 ngx_http_finalize_request(r, rc); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5613 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5614 </programlisting> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5615 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5616 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5617 The following fields of the request determine how the request body is read: |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5618 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5619 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5620 <list type="bullet"> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5621 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5622 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5623 <literal>request_body_in_single_buf</literal> - Read the body to a single memory |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5624 buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5625 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5626 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5627 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5628 <literal>request_body_in_file_only</literal> - Always read the body to a file, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5629 even if fits in the memory buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5630 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5631 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5632 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5633 <literal>request_body_in_persistent_file</literal> - Do not unlink the file |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5634 immediately after creation. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5635 A file with this flag can be moved to another directory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5636 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5637 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5638 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5639 <literal>request_body_in_clean_file</literal> - Unlink the file when the |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5640 request is finalized. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5641 This can be useful when a file was supposed to be moved to another directory |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5642 but was not moved for some reason. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5643 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5644 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5645 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5646 <literal>request_body_file_group_access</literal> - Enable group access to the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5647 file by replacing the default 0600 access mask with 0660. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5648 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5649 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5650 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5651 <literal>request_body_file_log_level</literal> - Severity level at which to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5652 log file errors. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5653 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5654 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5655 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5656 <literal>request_body_no_buffering</literal> - Read the request body without |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5657 buffering. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5658 </listitem> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5659 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5660 </list> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5661 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5662 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5663 The <literal>request_body_no_buffering</literal> flag enables the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5664 unbuffered mode of reading a request body. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5665 In this mode, after calling |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5666 <literal>ngx_http_read_client_request_body()</literal>, the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5667 <literal>bufs</literal> chain might keep only a part of the body. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5668 To read the next part, call the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5669 <literal>ngx_http_read_unbuffered_request_body(r)</literal> function. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5670 The return value <literal>NGX_AGAIN</literal> and the request flag |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5671 <literal>reading_body</literal> indicate that more data is available. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5672 If <literal>bufs</literal> is NULL after calling this function, there is |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5673 nothing to read at the moment. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5674 The request callback <literal>read_event_handler</literal> will be called when |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5675 the next part of request body is available. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5676 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5677 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5678 </section> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5679 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5680 |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5681 <section name="Response" id="http_response"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5682 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5683 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5684 In nginx an HTTP response is produced by sending the response header followed by |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5685 the optional response body. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5686 Both header and body are passed through a chain of filters and eventually get |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5687 written to the client socket. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5688 An nginx module can install its handler into the header or body filter chain |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5689 and process the output coming from the previous handler. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5690 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5691 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5692 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5693 <section name="Response header" id="http_response_header"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5694 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5695 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5696 The <literal>ngx_http_send_header(r)</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5697 function sends the output header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5698 Do not call this function until <literal>r->headers_out</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5699 contains all of the data required to produce the HTTP response header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5700 The <literal>status</literal> field in <literal>r->headers_out</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5701 must always be set. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5702 If the response status indicates that a response body follows the header, |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5703 <literal>content_length_n</literal> can be set as well. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5704 The default value for this field is <literal>-1</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5705 which means that the body size is unknown. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5706 In this case, chunked transfer encoding is used. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5707 To output an arbitrary header, append the <literal>headers</literal> list. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5708 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5709 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5710 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5711 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5712 ngx_http_foo_content_handler(ngx_http_request_t *r) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5713 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5714 ngx_int_t rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5715 ngx_table_elt_t *h; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5716 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5717 /* send header */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5718 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5719 r->headers_out.status = NGX_HTTP_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5720 r->headers_out.content_length_n = 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5721 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5722 /* X-Foo: foo */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5723 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5724 h = ngx_list_push(&r->headers_out.headers); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5725 if (h == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5726 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5727 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5728 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5729 h->hash = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5730 ngx_str_set(&h->key, "X-Foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5731 ngx_str_set(&h->value, "foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5732 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5733 rc = ngx_http_send_header(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5734 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5735 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5736 return rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5737 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5738 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5739 /* send body */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5740 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5741 ... |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5742 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5743 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5744 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5745 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5746 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5747 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5748 <section name="Header filters" id="http_header_filters"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5749 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5750 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5751 The <literal>ngx_http_send_header(r)</literal> function invokes the header |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5752 filter chain by calling the first header filter handler stored in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5753 the <literal>ngx_http_top_header_filter</literal> variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5754 It's assumed that every header handler calls the next handler in the chain |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5755 until the final handler <literal>ngx_http_header_filter(r)</literal> is called. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5756 The final header handler constructs the HTTP response based on |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5757 <literal>r->headers_out</literal> and passes it to the |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5758 <literal>ngx_http_writer_filter</literal> for output. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5759 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5760 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5761 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5762 To add a handler to the header filter chain, store its address in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5763 the global variable <literal>ngx_http_top_header_filter</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5764 at configuration time. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5765 The previous handler address is normally stored in a static variable in a module |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5766 and is called by the newly added handler before exiting. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5767 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5768 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5769 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5770 The following example of a header filter module adds the HTTP header |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5771 "<literal>X-Foo: foo</literal>" to every response with status |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5772 <literal>200</literal>. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5773 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5774 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5775 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5776 #include <ngx_config.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5777 #include <ngx_core.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5778 #include <ngx_http.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5779 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5780 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5781 static ngx_int_t ngx_http_foo_header_filter(ngx_http_request_t *r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5782 static ngx_int_t ngx_http_foo_header_filter_init(ngx_conf_t *cf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5783 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5784 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5785 static ngx_http_module_t ngx_http_foo_header_filter_module_ctx = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5786 NULL, /* preconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5787 ngx_http_foo_header_filter_init, /* postconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5788 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5789 NULL, /* create main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5790 NULL, /* init main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5791 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5792 NULL, /* create server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5793 NULL, /* merge server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5794 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5795 NULL, /* create location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5796 NULL /* merge location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5797 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5798 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5799 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5800 ngx_module_t ngx_http_foo_header_filter_module = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5801 NGX_MODULE_V1, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5802 &ngx_http_foo_header_filter_module_ctx, /* module context */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5803 NULL, /* module directives */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5804 NGX_HTTP_MODULE, /* module type */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5805 NULL, /* init master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5806 NULL, /* init module */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5807 NULL, /* init process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5808 NULL, /* init thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5809 NULL, /* exit thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5810 NULL, /* exit process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5811 NULL, /* exit master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5812 NGX_MODULE_V1_PADDING |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5813 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5814 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5815 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5816 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5817 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5818 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5819 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5820 ngx_http_foo_header_filter(ngx_http_request_t *r) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5821 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5822 ngx_table_elt_t *h; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5823 |
1971
5fb870087b76
Fixed typo and removed trailing spaces.
Vladimir Homutov <vl@nginx.com>
parents:
1970
diff
changeset
|
5824 /* |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5825 * The filter handler adds "X-Foo: foo" header |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5826 * to every HTTP 200 response |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5827 */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5828 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5829 if (r->headers_out.status != NGX_HTTP_OK) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5830 return ngx_http_next_header_filter(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5831 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5832 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5833 h = ngx_list_push(&r->headers_out.headers); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5834 if (h == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5835 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5836 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5837 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5838 h->hash = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5839 ngx_str_set(&h->key, "X-Foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5840 ngx_str_set(&h->value, "foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5841 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5842 return ngx_http_next_header_filter(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5843 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5844 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5845 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5846 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5847 ngx_http_foo_header_filter_init(ngx_conf_t *cf) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5848 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5849 ngx_http_next_header_filter = ngx_http_top_header_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5850 ngx_http_top_header_filter = ngx_http_foo_header_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5851 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5852 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5853 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5854 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5855 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5856 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5857 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5858 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5859 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5860 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5861 <section name="Response body" id="http_response_body"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5862 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5863 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5864 To send the response body, call the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5865 <literal>ngx_http_output_filter(r, cl)</literal> function. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5866 The function can be called multiple times. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5867 Each time, it sends a part of the response body in the form of a buffer chain. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5868 Set the <literal>last_buf</literal> flag in the last body buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5869 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5870 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5871 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5872 The following example produces a complete HTTP response with "foo" as its body. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5873 For the example to work as subrequest as well as a main request, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5874 the <literal>last_in_chain</literal> flag is set in the last buffer |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5875 of the output. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5876 The <literal>last_buf</literal> flag is set only for the main request because |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5877 the last buffer for a subrequest does not end the entire output. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5878 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5879 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5880 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5881 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5882 ngx_http_bar_content_handler(ngx_http_request_t *r) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5883 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5884 ngx_int_t rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5885 ngx_buf_t *b; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5886 ngx_chain_t out; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5887 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5888 /* send header */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5889 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5890 r->headers_out.status = NGX_HTTP_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5891 r->headers_out.content_length_n = 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5892 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5893 rc = ngx_http_send_header(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5894 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5895 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5896 return rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5897 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5898 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5899 /* send body */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5900 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5901 b = ngx_calloc_buf(r->pool); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5902 if (b == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5903 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5904 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5905 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5906 b->last_buf = (r == r->main) ? 1: 0; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5907 b->last_in_chain = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5908 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5909 b->memory = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5910 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5911 b->pos = (u_char *) "foo"; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5912 b->last = b->pos + 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5913 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5914 out.buf = b; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5915 out.next = NULL; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5916 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5917 return ngx_http_output_filter(r, &out); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5918 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5919 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5920 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5921 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5922 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5923 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5924 <section name="Body filters" id="http_body_filters"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5925 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5926 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5927 The function <literal>ngx_http_output_filter(r, cl)</literal> invokes the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5928 body filter chain by calling the first body filter handler stored in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5929 the <literal>ngx_http_top_body_filter</literal> variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5930 It's assumed that every body handler calls the next handler in the chain until |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5931 the final handler <literal>ngx_http_write_filter(r, cl)</literal> is called. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5932 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5933 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5934 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5935 A body filter handler receives a chain of buffers. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5936 The handler is supposed to process the buffers and pass a possibly new chain to |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5937 the next handler. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5938 It's worth noting that the chain links <literal>ngx_chain_t</literal> of the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5939 incoming chain belong to the caller, and must not be reused or changed. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5940 Right after the handler completes, the caller can use its output chain links |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5941 to keep track of the buffers it has sent. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5942 To save the buffer chain or to substitute some buffers before passing to the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5943 next filter, a handler needs to allocate its own chain links. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5944 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5945 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5946 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5947 Following is an example of a simple body filter that counts the number of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5948 bytes in the body. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5949 The result is available as the <literal>$counter</literal> variable which can be |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5950 used in the access log. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5951 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5952 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5953 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5954 #include <ngx_config.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5955 #include <ngx_core.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5956 #include <ngx_http.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5957 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5958 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5959 typedef struct { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5960 off_t count; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5961 } ngx_http_counter_filter_ctx_t; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5962 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5963 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5964 static ngx_int_t ngx_http_counter_body_filter(ngx_http_request_t *r, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5965 ngx_chain_t *in); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5966 static ngx_int_t ngx_http_counter_variable(ngx_http_request_t *r, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5967 ngx_http_variable_value_t *v, uintptr_t data); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5968 static ngx_int_t ngx_http_counter_add_variables(ngx_conf_t *cf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5969 static ngx_int_t ngx_http_counter_filter_init(ngx_conf_t *cf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5970 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5971 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5972 static ngx_http_module_t ngx_http_counter_filter_module_ctx = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5973 ngx_http_counter_add_variables, /* preconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5974 ngx_http_counter_filter_init, /* postconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5975 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5976 NULL, /* create main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5977 NULL, /* init main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5978 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5979 NULL, /* create server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5980 NULL, /* merge server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5981 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5982 NULL, /* create location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5983 NULL /* merge location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5984 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5985 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5986 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5987 ngx_module_t ngx_http_counter_filter_module = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5988 NGX_MODULE_V1, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5989 &ngx_http_counter_filter_module_ctx, /* module context */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5990 NULL, /* module directives */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5991 NGX_HTTP_MODULE, /* module type */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5992 NULL, /* init master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5993 NULL, /* init module */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5994 NULL, /* init process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5995 NULL, /* init thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5996 NULL, /* exit thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5997 NULL, /* exit process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5998 NULL, /* exit master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5999 NGX_MODULE_V1_PADDING |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6000 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6001 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6002 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6003 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6004 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6005 static ngx_str_t ngx_http_counter_name = ngx_string("counter"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6006 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6007 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6008 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6009 ngx_http_counter_body_filter(ngx_http_request_t *r, ngx_chain_t *in) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6010 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6011 ngx_chain_t *cl; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6012 ngx_http_counter_filter_ctx_t *ctx; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6013 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6014 ctx = ngx_http_get_module_ctx(r, ngx_http_counter_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6015 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6016 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_counter_filter_ctx_t)); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6017 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6018 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6019 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6020 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6021 ngx_http_set_ctx(r, ctx, ngx_http_counter_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6022 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6023 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6024 for (cl = in; cl; cl = cl->next) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6025 ctx->count += ngx_buf_size(cl->buf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6026 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6027 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6028 return ngx_http_next_body_filter(r, in); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6029 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6030 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6031 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6032 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6033 ngx_http_counter_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6034 uintptr_t data) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6035 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6036 u_char *p; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6037 ngx_http_counter_filter_ctx_t *ctx; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6038 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6039 ctx = ngx_http_get_module_ctx(r, ngx_http_counter_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6040 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6041 v->not_found = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6042 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6043 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6044 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6045 p = ngx_pnalloc(r->pool, NGX_OFF_T_LEN); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6046 if (p == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6047 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6048 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6049 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6050 v->data = p; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6051 v->len = ngx_sprintf(p, "%O", ctx->count) - p; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6052 v->valid = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6053 v->no_cacheable = 0; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6054 v->not_found = 0; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6055 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6056 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6057 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6058 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6059 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6060 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6061 ngx_http_counter_add_variables(ngx_conf_t *cf) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6062 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6063 ngx_http_variable_t *var; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6064 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6065 var = ngx_http_add_variable(cf, &ngx_http_counter_name, 0); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6066 if (var == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6067 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6068 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6069 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6070 var->get_handler = ngx_http_counter_variable; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6071 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6072 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6073 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6074 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6075 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6076 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6077 ngx_http_counter_filter_init(ngx_conf_t *cf) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6078 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6079 ngx_http_next_body_filter = ngx_http_top_body_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6080 ngx_http_top_body_filter = ngx_http_counter_body_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6081 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6082 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6083 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6084 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6085 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6086 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6087 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6088 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6089 <section name="Building filter modules" id="http_building_filter_modules"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6090 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6091 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6092 When writing a body or header filter, pay special attention to the filter's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6093 position in the filter order. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6094 There's a number of header and body filters registered by nginx standard |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6095 modules. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6096 The nginx standard modules register a number of head and body filters and it's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6097 important to register a new filter module in the right place with respect to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6098 them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6099 Normally, modules register filters in their postconfiguration handlers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6100 The order in which filters are called during processing is obviously the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6101 reverse of the order in which they are registered. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6102 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6103 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6104 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6105 For third-party filter modules nginx provides a special slot |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6106 <literal>HTTP_AUX_FILTER_MODULES</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6107 To register a filter module in this slot, set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6108 the <literal>ngx_module_type</literal> variable to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6109 <literal>HTTP_AUX_FILTER</literal> in the module's configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6110 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6111 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6112 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6113 The following example shows a filter module config file assuming |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6114 for a module with just |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6115 one source file, <literal>ngx_http_foo_filter_module.c</literal>. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6116 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6117 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6118 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6119 ngx_module_type=HTTP_AUX_FILTER |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6120 ngx_module_name=ngx_http_foo_filter_module |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6121 ngx_module_srcs="$ngx_addon_dir/ngx_http_foo_filter_module.c" |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6122 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6123 . auto/module |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6124 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6125 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6126 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6127 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6128 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6129 <section name="Buffer reuse" id="http_body_buffers_reuse"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6130 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6131 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6132 When issuing or altering a stream of buffers, it's often desirable to reuse the |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6133 allocated buffers. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6134 A standard and widely adopted approach in nginx code is to keep |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6135 two buffer chains for this purpose: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6136 <literal>free</literal> and <literal>busy</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6137 The <literal>free</literal> chain keeps all free buffers, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6138 which can be reused. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6139 The <literal>busy</literal> chain keeps all buffers sent by the current |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6140 module that are still in use by some other filter handler. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6141 A buffer is considered in use if its size is greater than zero. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6142 Normally, when a buffer is consumed by a filter, its <literal>pos</literal> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6143 (or <literal>file_pos</literal> for a file buffer) is moved towards |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6144 <literal>last</literal> (<literal>file_last</literal> for a file buffer). |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6145 Once a buffer is completely consumed, it's ready to be reused. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6146 To add newly freed buffers to the <literal>free</literal> chain |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6147 it's enough to iterate over the <literal>busy</literal> chain and move the zero |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6148 size buffers at the head of it to <literal>free</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6149 This operation is so common that there is a special function for it, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6150 <literal>ngx_chain_update_chains(free, busy, out, tag)</literal>. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6151 The function appends the output chain <literal>out</literal> to |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6152 <literal>busy</literal> and moves free buffers from the top of |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6153 <literal>busy</literal> to <literal>free</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6154 Only the buffers with the specified <literal>tag</literal> are reused. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6155 This lets a module reuse only the buffers that it allocated itself. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6156 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6157 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6158 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6159 The following example is a body filter that inserts the string “foo” before each |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6160 incoming buffer. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6161 The new buffers allocated by the module are reused if possible. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6162 Note that for this example to work properly, setting up a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6163 <link id="http_header_filters">header filter</link> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6164 and resetting <literal>content_length_n</literal> to <literal>-1</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6165 is also required, but the relevant code is not provided here. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6166 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6167 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6168 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6169 typedef struct { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6170 ngx_chain_t *free; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6171 ngx_chain_t *busy; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6172 } ngx_http_foo_filter_ctx_t; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6173 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6174 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6175 ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6176 ngx_http_foo_body_filter(ngx_http_request_t *r, ngx_chain_t *in) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6177 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6178 ngx_int_t rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6179 ngx_buf_t *b; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6180 ngx_chain_t *cl, *tl, *out, **ll; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6181 ngx_http_foo_filter_ctx_t *ctx; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6182 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6183 ctx = ngx_http_get_module_ctx(r, ngx_http_foo_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6184 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6185 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_foo_filter_ctx_t)); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6186 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6187 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6188 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6189 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6190 ngx_http_set_ctx(r, ctx, ngx_http_foo_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6191 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6192 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6193 /* create a new chain "out" from "in" with all the changes */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6194 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6195 ll = &out; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6196 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6197 for (cl = in; cl; cl = cl->next) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6198 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6199 /* append "foo" in a reused buffer if possible */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6200 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6201 tl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6202 if (tl == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6203 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6204 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6205 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6206 b = tl->buf; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6207 b->tag = (ngx_buf_tag_t) &ngx_http_foo_filter_module; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6208 b->memory = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6209 b->pos = (u_char *) "foo"; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6210 b->last = b->pos + 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6211 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6212 *ll = tl; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6213 ll = &tl->next; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6214 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6215 /* append the next incoming buffer */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6216 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6217 tl = ngx_alloc_chain_link(r->pool); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6218 if (tl == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6219 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6220 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6221 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6222 tl->buf = cl->buf; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6223 *ll = tl; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6224 ll = &tl->next; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6225 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6226 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6227 *ll = NULL; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6228 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6229 /* send the new chain */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6230 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6231 rc = ngx_http_next_body_filter(r, out); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6232 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6233 /* update "busy" and "free" chains for reuse */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6234 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6235 ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6236 (ngx_buf_tag_t) &ngx_http_foo_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6237 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6238 return rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6239 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6240 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6241 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6242 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6243 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6244 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6245 <section name="Load balancing" id="http_load_balancing"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6246 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6247 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6248 The |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6249 <link doc="../http/ngx_http_upstream_module.xml">ngx_http_upstream_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6250 provides the basic functionality needed to pass requests to remote servers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6251 Modules that implement specific protocols, such as HTTP or FastCGI, use |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6252 this functionality. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6253 The module also provides an interface for creating custom |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6254 load-balancing modules and implements a default round-robin method. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6255 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6256 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6257 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6258 The <link doc="../http/ngx_http_upstream_module.xml" id="least_conn"/> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6259 and <link doc="../http/ngx_http_upstream_module.xml" id="hash"/> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6260 modules implement alternative load-balancing methods, but |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6261 are actually implemented as extensions of the upstream round-robin |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6262 module and share a lot of code with it, such as the representation |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6263 of a server group. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6264 The <link doc="../http/ngx_http_upstream_module.xml" id="keepalive"/> module |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6265 is an independent module that extends upstream functionality. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6266 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6267 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6268 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6269 The |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6270 <link doc="../http/ngx_http_upstream_module.xml">ngx_http_upstream_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6271 can be configured explicitly by placing the corresponding |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6272 <link doc="../http/ngx_http_upstream_module.xml" id="upstream"/> block into |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6273 the configuration file, or implicitly by using directives |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6274 such as <link doc="../http/ngx_http_proxy_module.xml" id="proxy_pass"/> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6275 that accept a URL that gets evaluated at some point into a list of servers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6276 The alternative load-balancing methods are available only with an explicit |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6277 upstream configuration. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6278 The upstream module configuration has its own directive context |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6279 <literal>NGX_HTTP_UPS_CONF</literal>. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6280 The structure is defined as follows: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6281 <programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6282 struct ngx_http_upstream_srv_conf_s { |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6283 ngx_http_upstream_peer_t peer; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6284 void **srv_conf; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6285 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6286 ngx_array_t *servers; /* ngx_http_upstream_server_t */ |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6287 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6288 ngx_uint_t flags; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6289 ngx_str_t host; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6290 u_char *file_name; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6291 ngx_uint_t line; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6292 in_port_t port; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6293 ngx_uint_t no_port; /* unsigned no_port:1 */ |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6294 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6295 #if (NGX_HTTP_UPSTREAM_ZONE) |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6296 ngx_shm_zone_t *shm_zone; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6297 #endif |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6298 }; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6299 </programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6300 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6301 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6302 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6303 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6304 <literal>srv_conf</literal> — Configuration context of upstream modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6305 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6306 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6307 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6308 <literal>servers</literal> — Array of |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6309 <literal>ngx_http_upstream_server_t</literal>, the result of parsing a set of |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6310 <link doc="../http/ngx_http_upstream_module.xml" id="server"/> directives |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6311 in the <literal>upstream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6312 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6313 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6314 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6315 <literal>flags</literal> — Flags that mostly mark which features |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6316 are supported by the load-balancing method. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6317 The features are configured as parameters of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6318 the <link doc="../http/ngx_http_upstream_module.xml" id="server"/> directive: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6319 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6320 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6321 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6322 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6323 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6324 <literal>NGX_HTTP_UPSTREAM_CREATE</literal> — Distinguishes explicitly |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6325 defined upstreams from those that are automatically created by the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6326 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_pass"/> directive |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6327 and “friends” |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6328 (FastCGI, SCGI, etc.) |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6329 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6330 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6331 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6332 <literal>NGX_HTTP_UPSTREAM_WEIGHT</literal> — The “<literal>weight</literal>” |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6333 parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6334 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6335 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6336 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6337 <literal>NGX_HTTP_UPSTREAM_MAX_FAILS</literal> — The |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6338 “<literal>max_fails</literal>” parameter is supported |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6339 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6340 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6341 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6342 <literal>NGX_HTTP_UPSTREAM_FAIL_TIMEOUT</literal> — |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6343 The “<literal>fail_timeout</literal>” parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6344 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6345 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6346 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6347 <literal>NGX_HTTP_UPSTREAM_DOWN</literal> — The “<literal>down</literal>” |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6348 parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6349 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6350 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6351 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6352 <literal>NGX_HTTP_UPSTREAM_BACKUP</literal> — The “<literal>backup</literal>” |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6353 parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6354 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6355 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6356 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6357 <literal>NGX_HTTP_UPSTREAM_MAX_CONNS</literal> — The |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6358 “<literal>max_conns</literal>” parameter is supported |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6359 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6360 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6361 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6362 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6363 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6364 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6365 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6366 <literal>host</literal> — Name of the upstream. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6367 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6368 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6369 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6370 <literal>file_name, line</literal> — Name of the configuration file |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6371 and the line where the <literal>upstream</literal> block is located. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6372 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6373 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6374 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6375 <literal>port</literal> and <literal>no_port</literal> — Not used for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6376 explicitly defined upstream groups. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6377 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6378 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6379 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6380 <literal>shm_zone</literal> — Shared memory zone used by this upstream group, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6381 if any. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6382 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6383 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6384 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6385 <literal>peer</literal> — object that holds generic methods for |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6386 initializing upstream configuration: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6387 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6388 <programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6389 typedef struct { |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6390 ngx_http_upstream_init_pt init_upstream; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6391 ngx_http_upstream_init_peer_pt init; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6392 void *data; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6393 } ngx_http_upstream_peer_t; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6394 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6395 A module that implements a load-balancing algorithm must set these |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6396 methods and initialize private <literal>data</literal>. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6397 If <literal>init_upstream</literal> was not initialized during configuration |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6398 parsing, <literal>ngx_http_upstream_module</literal> sets it to the default |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6399 <literal>ngx_http_upstream_init_round_robin</literal> algorithm. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6400 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6401 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6402 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6403 <literal>init_upstream(cf, us)</literal> — Configuration-time |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6404 method responsible for initializing a group of servers and |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6405 initializing the <literal>init()</literal> method in case of success. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6406 A typical load-balancing module uses a list of servers in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6407 <literal>upstream</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6408 to create an efficient data structure that it uses and saves its own |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6409 configuration to the <literal>data</literal> field. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6410 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6411 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6412 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6413 <literal>init(r, us)</literal> — Initializes a per-request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6414 <literal>ngx_http_upstream_peer_t.peer</literal> structure that is used for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6415 load balancing (not to be confused with the |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6416 <literal>ngx_http_upstream_srv_conf_t.peer</literal> described above which |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6417 is per-upstream). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6418 It is passed as the <literal>data</literal> argument to all callbacks that |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6419 deal with server selection. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6420 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6421 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6422 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6423 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6424 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6425 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6426 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6427 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6428 When nginx has to pass a request to another host for processing, it uses |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6429 the configured load-balancing method to obtain an address to connect to. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6430 The method is obtained from the |
1994
effdf0747a05
Development guide: fixed a typo.
Vladimir Homutov <vl@nginx.com>
parents:
1993
diff
changeset
|
6431 <literal>ngx_http_upstream_t.peer</literal> object |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6432 of type <literal>ngx_peer_connection_t</literal>: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6433 <programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6434 struct ngx_peer_connection_s { |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6435 ... |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6436 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6437 struct sockaddr *sockaddr; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6438 socklen_t socklen; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6439 ngx_str_t *name; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6440 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6441 ngx_uint_t tries; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6442 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6443 ngx_event_get_peer_pt get; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6444 ngx_event_free_peer_pt free; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6445 ngx_event_notify_peer_pt notify; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6446 void *data; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6447 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6448 #if (NGX_SSL || NGX_COMPAT) |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6449 ngx_event_set_peer_session_pt set_session; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6450 ngx_event_save_peer_session_pt save_session; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6451 #endif |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6452 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6453 ... |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6454 }; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6455 </programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6456 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6457 The structure has the following fields: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6458 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6459 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6460 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6461 <literal>sockaddr</literal>, <literal>socklen</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6462 <literal>name</literal> — Address of the upstream server to connect to; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6463 this is the output parameter of a load-balancing method. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6464 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6465 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6466 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6467 <literal>data</literal> — The per-request data of a load-balancing method; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6468 keeps the state of the selection algorithm and usually includes the link |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6469 to the upstream configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6470 It is passed as an argument to all methods that deal with server selection |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6471 (see <link id="lb_method_get">below</link>). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6472 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6473 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6474 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6475 <literal>tries</literal> — Allowed |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6476 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_next_upstream_tries">number</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6477 of attempts to connect to an upstream server. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6478 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6479 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6480 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6481 <literal>get</literal>, <literal>free</literal>, <literal>notify</literal>, |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6482 <literal>set_session</literal>, and <literal>save_session</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6483 - Methods of the load-balancing module, described below. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6484 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6485 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6486 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6487 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6488 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6489 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6490 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6491 All methods accept at least two arguments: a peer connection object |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6492 <literal>pc</literal> and the <literal>data</literal> created by |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6493 <literal>ngx_http_upstream_srv_conf_t.peer.init()</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6494 Note that it might differ from <literal>pc.data</literal> due |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6495 to “chaining” of load-balancing modules. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6496 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6497 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6498 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6499 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6500 <list type="bullet"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6501 <listitem id="lb_method_get"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6502 <literal>get(pc, data)</literal> — The method called when the upstream |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6503 module is ready to pass a request to an upstream server and needs to know |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6504 its address. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6505 The method has to fill the <literal>sockaddr</literal>, |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6506 <literal>socklen</literal>, and <literal>name</literal> fields of |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6507 <literal>ngx_peer_connection_t</literal> structure. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6508 The return is one of: |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6509 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6510 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6511 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6512 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6513 <literal>NGX_OK</literal> — Server was selected. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6514 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6515 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6516 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6517 <literal>NGX_ERROR</literal> — Internal error occurred. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6518 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6519 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6520 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6521 <literal>NGX_BUSY</literal> — no servers are currently available. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6522 This can happen due to many reasons, including: the dynamic server group is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6523 empty, all servers in the group are in the failed state, or |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6524 all servers in the group are already |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6525 handling the maximum number of connections. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6526 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6527 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6528 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6529 <literal>NGX_DONE</literal> — the underlying connection was reused and there |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6530 is no need to create a new connection to the upstream server. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6531 This value is set by the <literal>keepalive</literal> module. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6532 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6533 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6534 <!-- |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6535 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6536 <literal>NGX_ABORT</literal> — the request was queued and the further |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6537 processing of this request should be postponed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6538 This value is set by the <literal>queue</literal> module. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6539 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6540 --> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6541 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6542 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6543 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6544 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6545 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6546 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6547 <literal>free(pc, data, state)</literal> — The method called when an |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6548 upstream module has finished work with a particular server. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6549 The <literal>state</literal> argument is the completion status of the upstream |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6550 connection, a bitmask with the following possible values: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6551 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6552 <list type="bullet"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6553 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6554 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6555 <literal>NGX_PEER_FAILED</literal> — Attempt was |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6556 <link doc="../http/ngx_http_upstream_module.xml" id="max_fails">unsuccessful</link> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6557 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6558 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6559 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6560 <literal>NGX_PEER_NEXT</literal> — A special case when upstream server |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6561 returns codes <literal>403</literal> or <literal>404</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6562 which are not considered a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6563 <link doc="../http/ngx_http_upstream_module.xml" id="max_fails">failure</link>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6564 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6565 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6566 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6567 <literal>NGX_PEER_KEEPALIVE</literal> — Currently unused |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6568 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6569 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6570 </list> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6571 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6572 This method also decrements the <literal>tries</literal> counter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6573 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6574 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6575 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6576 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6577 <literal>notify(pc, data, type)</literal> — Currently unused |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6578 in the OSS version. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6579 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6580 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6581 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6582 <literal>set_session(pc, data)</literal> and |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6583 <literal>save_session(pc, data)</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6584 — SSL-specific methods that enable caching sessions to upstream |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6585 servers. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6586 The implementation is provided by the round-robin balancing method. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6587 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6588 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6589 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6590 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6591 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6592 |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
6593 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
6594 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6595 </section> |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
6596 |
2073
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6597 <section name="Examples" id="examples"> |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6598 |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6599 <para> |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6600 The |
2078
26e547b1022d
DevGuide: changed nginx-dev-examples repository.
Roman Arutyunyan <arut@nginx.com>
parents:
2073
diff
changeset
|
6601 <link url="http://hg.nginx.org/nginx-dev-examples">nginx-dev-examples</link> |
2073
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6602 repository provides nginx module examples. |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6603 |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6604 </para> |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6605 |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6606 </section> |
75882a2ca9dd
DevGuide: added examples section.
Roman Arutyunyan <arut@nginx.com>
parents:
2024
diff
changeset
|
6607 |
1899 | 6608 </article> |