Mercurial > hg > nginx
annotate src/http/modules/ngx_http_chunked_filter_module.c @ 4166:525a34d74a0a stable-1.0
Merging r4114, r4129:
Buffers reuse in chunked filter.
There were 2 buffers allocated on each buffer chain sent through chunked
filter (one buffer for chunk size, another one for trailing CRLF, about
120 bytes in total on 32-bit platforms). This resulted in large memory
consumption with long-lived requests sending many buffer chains. Usual
example of problematic scenario is streaming though proxy with
proxy_buffering set to off.
Introduced buffers reuse reduces memory consumption in the above problematic
scenario.
See here for initial report:
http://mailman.nginx.org/pipermail/nginx/2010-April/019814.html
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 30 Sep 2011 14:20:52 +0000 |
parents | 81457372d938 |
children | 4919fb357a5d |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
441
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4 */ |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_http.h> |
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10 |
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11 |
4166 | 12 typedef struct { |
13 ngx_chain_t *free; | |
14 ngx_chain_t *busy; | |
15 } ngx_http_chunked_filter_ctx_t; | |
16 | |
17 | |
681 | 18 static ngx_int_t ngx_http_chunked_filter_init(ngx_conf_t *cf); |
99
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19 |
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20 |
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21 static ngx_http_module_t ngx_http_chunked_filter_module_ctx = { |
509 | 22 NULL, /* preconfiguration */ |
681 | 23 ngx_http_chunked_filter_init, /* postconfiguration */ |
177
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24 |
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25 NULL, /* create main configuration */ |
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26 NULL, /* init main configuration */ |
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27 |
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28 NULL, /* create server configuration */ |
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29 NULL, /* merge server configuration */ |
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30 |
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31 NULL, /* create location configuration */ |
629 | 32 NULL /* merge location configuration */ |
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33 }; |
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34 |
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35 |
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36 ngx_module_t ngx_http_chunked_filter_module = { |
509 | 37 NGX_MODULE_V1, |
99
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38 &ngx_http_chunked_filter_module_ctx, /* module context */ |
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39 NULL, /* module directives */ |
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40 NGX_HTTP_MODULE, /* module type */ |
541 | 41 NULL, /* init master */ |
681 | 42 NULL, /* init module */ |
541 | 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 | |
99
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49 }; |
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50 |
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51 |
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52 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
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53 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; |
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54 |
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55 |
501 | 56 static ngx_int_t |
57 ngx_http_chunked_header_filter(ngx_http_request_t *r) | |
99
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58 { |
4166 | 59 ngx_http_core_loc_conf_t *clcf; |
60 ngx_http_chunked_filter_ctx_t *ctx; | |
3484 | 61 |
615 | 62 if (r->headers_out.status == NGX_HTTP_NOT_MODIFIED |
63 || r->headers_out.status == NGX_HTTP_NO_CONTENT | |
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64 || r != r->main |
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65 || (r->method & NGX_HTTP_HEAD)) |
615 | 66 { |
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67 return ngx_http_next_header_filter(r); |
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68 } |
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69 |
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70 if (r->headers_out.content_length_n == -1) { |
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71 if (r->http_version < NGX_HTTP_VERSION_11) { |
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72 r->keepalive = 0; |
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73 |
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74 } else { |
3484 | 75 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
76 | |
77 if (clcf->chunked_transfer_encoding) { | |
78 r->chunked = 1; | |
79 | |
4166 | 80 ctx = ngx_pcalloc(r->pool, |
81 sizeof(ngx_http_chunked_filter_ctx_t)); | |
82 if (ctx == NULL) { | |
83 return NGX_ERROR; | |
84 } | |
85 | |
86 ngx_http_set_ctx(r, ctx, ngx_http_chunked_filter_module); | |
87 | |
3484 | 88 } else { |
89 r->keepalive = 0; | |
90 } | |
99
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91 } |
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92 } |
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93 |
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94 return ngx_http_next_header_filter(r); |
99
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95 } |
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96 |
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97 |
501 | 98 static ngx_int_t |
99 ngx_http_chunked_body_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
99
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100 { |
4166 | 101 u_char *chunk; |
102 off_t size; | |
103 ngx_int_t rc; | |
104 ngx_buf_t *b; | |
105 ngx_chain_t *out, *cl, *tl, **ll; | |
106 ngx_http_chunked_filter_ctx_t *ctx; | |
99
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107 |
483 | 108 if (in == NULL || !r->chunked || r->header_only) { |
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109 return ngx_http_next_body_filter(r, in); |
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110 } |
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111 |
4166 | 112 ctx = ngx_http_get_module_ctx(r, ngx_http_chunked_filter_module); |
113 | |
114 out = NULL; | |
115 ll = &out; | |
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116 |
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117 size = 0; |
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118 cl = in; |
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119 |
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120 for ( ;; ) { |
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121 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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122 "http chunk: %d", ngx_buf_size(cl->buf)); |
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123 |
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124 size += ngx_buf_size(cl->buf); |
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125 |
667 | 126 if (cl->buf->flush |
127 || cl->buf->sync | |
128 || ngx_buf_in_memory(cl->buf) | |
129 || cl->buf->in_file) | |
130 { | |
501 | 131 tl = ngx_alloc_chain_link(r->pool); |
132 if (tl == NULL) { | |
461 | 133 return NGX_ERROR; |
134 } | |
135 | |
452 | 136 tl->buf = cl->buf; |
137 *ll = tl; | |
138 ll = &tl->next; | |
139 } | |
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140 |
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141 if (cl->next == NULL) { |
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142 break; |
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143 } |
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144 |
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145 cl = cl->next; |
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146 } |
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147 |
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148 if (size) { |
4166 | 149 tl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
150 if (tl == NULL) { | |
455 | 151 return NGX_ERROR; |
152 } | |
153 | |
4166 | 154 b = tl->buf; |
155 chunk = b->start; | |
156 | |
157 if (chunk == NULL) { | |
158 /* the "0000000000000000" is 64-bit hexadecimal string */ | |
501 | 159 |
4166 | 160 chunk = ngx_palloc(r->pool, sizeof("0000000000000000" CRLF) - 1); |
161 if (chunk == NULL) { | |
162 return NGX_ERROR; | |
163 } | |
164 | |
165 b->start = chunk; | |
166 b->end = chunk + sizeof("0000000000000000" CRLF) - 1; | |
455 | 167 } |
168 | |
4166 | 169 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module; |
170 b->memory = 0; | |
455 | 171 b->temporary = 1; |
172 b->pos = chunk; | |
473 | 173 b->last = ngx_sprintf(chunk, "%xO" CRLF, size); |
455 | 174 |
4166 | 175 tl->next = out; |
176 out = tl; | |
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177 } |
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178 |
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179 if (cl->buf->last_buf) { |
4166 | 180 tl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
181 if (tl == NULL) { | |
461 | 182 return NGX_ERROR; |
183 } | |
184 | |
4166 | 185 b = tl->buf; |
186 | |
187 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module; | |
188 b->temporary = 0; | |
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189 b->memory = 1; |
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190 b->last_buf = 1; |
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191 b->pos = (u_char *) CRLF "0" CRLF CRLF; |
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192 b->last = b->pos + 7; |
99
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193 |
343
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194 cl->buf->last_buf = 0; |
336
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195 |
4166 | 196 *ll = tl; |
197 | |
336
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198 if (size == 0) { |
343
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199 b->pos += 2; |
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200 } |
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201 |
4166 | 202 } else if (size > 0) { |
203 tl = ngx_chain_get_free_buf(r->pool, &ctx->free); | |
204 if (tl == NULL) { | |
461 | 205 return NGX_ERROR; |
206 } | |
207 | |
4166 | 208 b = tl->buf; |
209 | |
210 b->tag = (ngx_buf_tag_t) &ngx_http_chunked_filter_module; | |
211 b->temporary = 0; | |
343
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212 b->memory = 1; |
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213 b->pos = (u_char *) CRLF; |
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214 b->last = b->pos + 2; |
4166 | 215 |
216 *ll = tl; | |
217 | |
218 } else { | |
219 *ll = NULL; | |
99
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220 } |
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221 |
4166 | 222 rc = ngx_http_next_body_filter(r, out); |
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223 |
4166 | 224 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, |
225 (ngx_buf_tag_t) &ngx_http_chunked_filter_module); | |
226 | |
227 return rc; | |
99
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228 } |
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229 |
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230 |
501 | 231 static ngx_int_t |
681 | 232 ngx_http_chunked_filter_init(ngx_conf_t *cf) |
99
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233 { |
155
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234 ngx_http_next_header_filter = ngx_http_top_header_filter; |
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235 ngx_http_top_header_filter = ngx_http_chunked_header_filter; |
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236 |
155
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237 ngx_http_next_body_filter = ngx_http_top_body_filter; |
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238 ngx_http_top_body_filter = ngx_http_chunked_body_filter; |
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239 |
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240 return NGX_OK; |
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241 } |