Mercurial > hg > nginx-quic
comparison src/stream/ngx_stream_write_filter_module.c @ 6692:56fc55e32f23
Stream: filters.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Thu, 15 Sep 2016 14:55:46 +0300 |
parents | |
children | a7ff19afbb14 |
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6691:4bce3edfac2c | 6692:56fc55e32f23 |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 * Copyright (C) Nginx, Inc. | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_stream.h> | |
11 | |
12 | |
13 typedef struct { | |
14 ngx_chain_t *from_upstream; | |
15 ngx_chain_t *from_downstream; | |
16 } ngx_stream_write_filter_ctx_t; | |
17 | |
18 | |
19 static ngx_int_t ngx_stream_write_filter(ngx_stream_session_t *s, | |
20 ngx_chain_t *in, ngx_uint_t from_upstream); | |
21 static ngx_int_t ngx_stream_write_filter_init(ngx_conf_t *cf); | |
22 | |
23 | |
24 static ngx_stream_module_t ngx_stream_write_filter_module_ctx = { | |
25 NULL, /* preconfiguration */ | |
26 ngx_stream_write_filter_init, /* postconfiguration */ | |
27 | |
28 NULL, /* create main configuration */ | |
29 NULL, /* init main configuration */ | |
30 | |
31 NULL, /* create server configuration */ | |
32 NULL /* merge server configuration */ | |
33 }; | |
34 | |
35 | |
36 ngx_module_t ngx_stream_write_filter_module = { | |
37 NGX_MODULE_V1, | |
38 &ngx_stream_write_filter_module_ctx, /* module context */ | |
39 NULL, /* module directives */ | |
40 NGX_STREAM_MODULE, /* module type */ | |
41 NULL, /* init master */ | |
42 NULL, /* init module */ | |
43 NULL, /* init process */ | |
44 NULL, /* init thread */ | |
45 NULL, /* exit thread */ | |
46 NULL, /* exit process */ | |
47 NULL, /* exit master */ | |
48 NGX_MODULE_V1_PADDING | |
49 }; | |
50 | |
51 | |
52 static ngx_int_t | |
53 ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in, | |
54 ngx_uint_t from_upstream) | |
55 { | |
56 off_t size; | |
57 ngx_uint_t last, flush, sync; | |
58 ngx_chain_t *cl, *ln, **ll, **out, *chain; | |
59 ngx_connection_t *c; | |
60 ngx_stream_write_filter_ctx_t *ctx; | |
61 | |
62 ctx = ngx_stream_get_module_ctx(s, ngx_stream_write_filter_module); | |
63 | |
64 if (ctx == NULL) { | |
65 ctx = ngx_pcalloc(s->connection->pool, | |
66 sizeof(ngx_stream_write_filter_ctx_t)); | |
67 if (ctx == NULL) { | |
68 return NGX_ERROR; | |
69 } | |
70 | |
71 ngx_stream_set_ctx(s, ctx, ngx_stream_write_filter_module); | |
72 } | |
73 | |
74 if (from_upstream) { | |
75 c = s->connection; | |
76 out = &ctx->from_upstream; | |
77 | |
78 } else { | |
79 c = s->upstream->peer.connection; | |
80 out = &ctx->from_downstream; | |
81 } | |
82 | |
83 if (c->error) { | |
84 return NGX_ERROR; | |
85 } | |
86 | |
87 size = 0; | |
88 flush = 0; | |
89 sync = 0; | |
90 last = 0; | |
91 ll = out; | |
92 | |
93 /* find the size, the flush point and the last link of the saved chain */ | |
94 | |
95 for (cl = *out; cl; cl = cl->next) { | |
96 ll = &cl->next; | |
97 | |
98 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
99 "write old buf t:%d f:%d %p, pos %p, size: %z " | |
100 "file: %O, size: %O", | |
101 cl->buf->temporary, cl->buf->in_file, | |
102 cl->buf->start, cl->buf->pos, | |
103 cl->buf->last - cl->buf->pos, | |
104 cl->buf->file_pos, | |
105 cl->buf->file_last - cl->buf->file_pos); | |
106 | |
107 #if 1 | |
108 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { | |
109 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
110 "zero size buf in writer " | |
111 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
112 cl->buf->temporary, | |
113 cl->buf->recycled, | |
114 cl->buf->in_file, | |
115 cl->buf->start, | |
116 cl->buf->pos, | |
117 cl->buf->last, | |
118 cl->buf->file, | |
119 cl->buf->file_pos, | |
120 cl->buf->file_last); | |
121 | |
122 ngx_debug_point(); | |
123 return NGX_ERROR; | |
124 } | |
125 #endif | |
126 | |
127 size += ngx_buf_size(cl->buf); | |
128 | |
129 if (cl->buf->flush || cl->buf->recycled) { | |
130 flush = 1; | |
131 } | |
132 | |
133 if (cl->buf->sync) { | |
134 sync = 1; | |
135 } | |
136 | |
137 if (cl->buf->last_buf) { | |
138 last = 1; | |
139 } | |
140 } | |
141 | |
142 /* add the new chain to the existent one */ | |
143 | |
144 for (ln = in; ln; ln = ln->next) { | |
145 cl = ngx_alloc_chain_link(c->pool); | |
146 if (cl == NULL) { | |
147 return NGX_ERROR; | |
148 } | |
149 | |
150 cl->buf = ln->buf; | |
151 *ll = cl; | |
152 ll = &cl->next; | |
153 | |
154 ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
155 "write new buf t:%d f:%d %p, pos %p, size: %z " | |
156 "file: %O, size: %O", | |
157 cl->buf->temporary, cl->buf->in_file, | |
158 cl->buf->start, cl->buf->pos, | |
159 cl->buf->last - cl->buf->pos, | |
160 cl->buf->file_pos, | |
161 cl->buf->file_last - cl->buf->file_pos); | |
162 | |
163 #if 1 | |
164 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { | |
165 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
166 "zero size buf in writer " | |
167 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
168 cl->buf->temporary, | |
169 cl->buf->recycled, | |
170 cl->buf->in_file, | |
171 cl->buf->start, | |
172 cl->buf->pos, | |
173 cl->buf->last, | |
174 cl->buf->file, | |
175 cl->buf->file_pos, | |
176 cl->buf->file_last); | |
177 | |
178 ngx_debug_point(); | |
179 return NGX_ERROR; | |
180 } | |
181 #endif | |
182 | |
183 size += ngx_buf_size(cl->buf); | |
184 | |
185 if (cl->buf->flush || cl->buf->recycled) { | |
186 flush = 1; | |
187 } | |
188 | |
189 if (cl->buf->sync) { | |
190 sync = 1; | |
191 } | |
192 | |
193 if (cl->buf->last_buf) { | |
194 last = 1; | |
195 } | |
196 } | |
197 | |
198 *ll = NULL; | |
199 | |
200 ngx_log_debug3(NGX_LOG_DEBUG_STREAM, c->log, 0, | |
201 "stream write filter: l:%ui f:%ui s:%O", last, flush, size); | |
202 | |
203 if (size == 0 | |
204 && !(c->buffered & NGX_LOWLEVEL_BUFFERED) | |
205 && !(last && c->need_last_buf)) | |
206 { | |
207 if (last || flush || sync) { | |
208 for (cl = *out; cl; /* void */) { | |
209 ln = cl; | |
210 cl = cl->next; | |
211 ngx_free_chain(c->pool, ln); | |
212 } | |
213 | |
214 *out = NULL; | |
215 c->buffered &= ~NGX_STREAM_WRITE_BUFFERED; | |
216 | |
217 return NGX_OK; | |
218 } | |
219 | |
220 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
221 "the stream output chain is empty"); | |
222 | |
223 ngx_debug_point(); | |
224 | |
225 return NGX_ERROR; | |
226 } | |
227 | |
228 chain = c->send_chain(c, *out, 0); | |
229 | |
230 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0, | |
231 "stream write filter %p", chain); | |
232 | |
233 if (chain == NGX_CHAIN_ERROR) { | |
234 c->error = 1; | |
235 return NGX_ERROR; | |
236 } | |
237 | |
238 for (cl = *out; cl && cl != chain; /* void */) { | |
239 ln = cl; | |
240 cl = cl->next; | |
241 ngx_free_chain(c->pool, ln); | |
242 } | |
243 | |
244 *out = chain; | |
245 | |
246 if (chain) { | |
247 if (c->shared) { | |
248 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
249 "shared connection is busy"); | |
250 return NGX_ERROR; | |
251 } | |
252 | |
253 c->buffered |= NGX_STREAM_WRITE_BUFFERED; | |
254 return NGX_AGAIN; | |
255 } | |
256 | |
257 c->buffered &= ~NGX_STREAM_WRITE_BUFFERED; | |
258 | |
259 if (c->buffered & NGX_LOWLEVEL_BUFFERED) { | |
260 return NGX_AGAIN; | |
261 } | |
262 | |
263 return NGX_OK; | |
264 } | |
265 | |
266 | |
267 static ngx_int_t | |
268 ngx_stream_write_filter_init(ngx_conf_t *cf) | |
269 { | |
270 ngx_stream_top_filter = ngx_stream_write_filter; | |
271 | |
272 return NGX_OK; | |
273 } |