Mercurial > hg > nginx-quic
annotate src/http/ngx_http_copy_filter_module.c @ 8890:0784ab86ad08
Upstream: fixed X-Accel-Expires/Cache-Control/Expires handling.
Previously, if caching was disabled due to Expires in the past, nginx
failed to cache the response even if it was cacheable as per subsequently
parsed Cache-Control header (ticket #964).
Similarly, if caching was disabled due to Expires in the past,
"Cache-Control: no-cache" or "Cache-Control: max-age=0", caching was not
used if it was cacheable as per subsequently parsed X-Accel-Expires header.
Fix is to avoid disabling caching immediately after parsing Expires in
the past or Cache-Control, but rather set flags which are later checked by
ngx_http_upstream_process_headers() (and cleared by "Cache-Control: max-age"
and X-Accel-Expires).
Additionally, now X-Accel-Expires does not prevent parsing of cache control
extensions, notably stale-while-revalidate and stale-if-error. This
ensures that order of the X-Accel-Expires and Cache-Control headers is not
important.
Prodded by Vadim Fedorenko and Yugo Horie.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 07 Jun 2022 00:07:12 +0300 |
parents | ec2e6893caaa |
children |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_http.h> |
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13 typedef struct { |
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14 ngx_bufs_t bufs; |
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15 } ngx_http_copy_filter_conf_t; |
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17 |
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18 #if (NGX_HAVE_FILE_AIO) |
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19 static void ngx_http_copy_aio_handler(ngx_output_chain_ctx_t *ctx, |
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20 ngx_file_t *file); |
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21 static void ngx_http_copy_aio_event_handler(ngx_event_t *ev); |
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22 #endif |
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23 #if (NGX_THREADS) |
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24 static ngx_int_t ngx_http_copy_thread_handler(ngx_thread_task_t *task, |
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25 ngx_file_t *file); |
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26 static void ngx_http_copy_thread_event_handler(ngx_event_t *ev); |
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27 #endif |
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28 |
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29 static void *ngx_http_copy_filter_create_conf(ngx_conf_t *cf); |
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30 static char *ngx_http_copy_filter_merge_conf(ngx_conf_t *cf, |
501 | 31 void *parent, void *child); |
681 | 32 static ngx_int_t ngx_http_copy_filter_init(ngx_conf_t *cf); |
10
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33 |
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34 |
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35 static ngx_command_t ngx_http_copy_filter_commands[] = { |
10
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36 |
501 | 37 { ngx_string("output_buffers"), |
38 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, | |
39 ngx_conf_set_bufs_slot, | |
40 NGX_HTTP_LOC_CONF_OFFSET, | |
41 offsetof(ngx_http_copy_filter_conf_t, bufs), | |
42 NULL }, | |
10
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43 |
501 | 44 ngx_null_command |
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45 }; |
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47 |
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48 static ngx_http_module_t ngx_http_copy_filter_module_ctx = { |
509 | 49 NULL, /* preconfiguration */ |
681 | 50 ngx_http_copy_filter_init, /* postconfiguration */ |
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51 |
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52 NULL, /* create main configuration */ |
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53 NULL, /* init main configuration */ |
69
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54 |
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55 NULL, /* create server configuration */ |
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56 NULL, /* merge server configuration */ |
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57 |
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58 ngx_http_copy_filter_create_conf, /* create location configuration */ |
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59 ngx_http_copy_filter_merge_conf /* merge location configuration */ |
26
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60 }; |
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61 |
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63 ngx_module_t ngx_http_copy_filter_module = { |
509 | 64 NGX_MODULE_V1, |
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65 &ngx_http_copy_filter_module_ctx, /* module context */ |
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66 ngx_http_copy_filter_commands, /* module directives */ |
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67 NGX_HTTP_MODULE, /* module type */ |
541 | 68 NULL, /* init master */ |
681 | 69 NULL, /* init module */ |
541 | 70 NULL, /* init process */ |
71 NULL, /* init thread */ | |
72 NULL, /* exit thread */ | |
73 NULL, /* exit process */ | |
74 NULL, /* exit master */ | |
75 NGX_MODULE_V1_PADDING | |
40
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76 }; |
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77 |
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78 |
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79 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; |
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81 |
501 | 82 static ngx_int_t |
83 ngx_http_copy_filter(ngx_http_request_t *r, ngx_chain_t *in) | |
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84 { |
583 | 85 ngx_int_t rc; |
86 ngx_connection_t *c; | |
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87 ngx_output_chain_ctx_t *ctx; |
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88 ngx_http_core_loc_conf_t *clcf; |
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89 ngx_http_copy_filter_conf_t *conf; |
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90 |
583 | 91 c = r->connection; |
92 | |
93 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, | |
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94 "http copy filter: \"%V?%V\"", &r->uri, &r->args); |
509 | 95 |
96 ctx = ngx_http_get_module_ctx(r, ngx_http_copy_filter_module); | |
60
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97 |
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98 if (ctx == NULL) { |
501 | 99 ctx = ngx_pcalloc(r->pool, sizeof(ngx_output_chain_ctx_t)); |
100 if (ctx == NULL) { | |
101 return NGX_ERROR; | |
102 } | |
103 | |
104 ngx_http_set_ctx(r, ctx, ngx_http_copy_filter_module); | |
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105 |
3053 | 106 conf = ngx_http_get_module_loc_conf(r, ngx_http_copy_filter_module); |
107 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); | |
108 | |
583 | 109 ctx->sendfile = c->sendfile; |
513 | 110 ctx->need_in_memory = r->main_filter_need_in_memory |
111 || r->filter_need_in_memory; | |
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112 ctx->need_in_temp = r->filter_need_temporary; |
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113 |
3053 | 114 ctx->alignment = clcf->directio_alignment; |
115 | |
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116 ctx->pool = r->pool; |
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117 ctx->bufs = conf->bufs; |
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118 ctx->tag = (ngx_buf_tag_t) &ngx_http_copy_filter_module; |
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119 |
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120 ctx->output_filter = (ngx_output_chain_filter_pt) |
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121 ngx_http_next_body_filter; |
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122 ctx->filter_ctx = r; |
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123 |
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124 #if (NGX_HAVE_FILE_AIO) |
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125 if (ngx_file_aio && clcf->aio == NGX_HTTP_AIO_ON) { |
6004 | 126 ctx->aio_handler = ngx_http_copy_aio_handler; |
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127 } |
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128 #endif |
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129 |
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130 #if (NGX_THREADS) |
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131 if (clcf->aio == NGX_HTTP_AIO_THREADS) { |
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132 ctx->thread_handler = ngx_http_copy_thread_handler; |
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133 } |
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134 #endif |
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135 |
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136 if (in && in->buf && ngx_buf_size(in->buf)) { |
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137 r->request_output = 1; |
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138 } |
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139 } |
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140 |
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141 #if (NGX_HAVE_FILE_AIO || NGX_THREADS) |
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142 ctx->aio = r->aio; |
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143 #endif |
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144 |
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145 rc = ngx_output_chain(ctx, in); |
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147 if (ctx->in == NULL) { |
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148 r->buffered &= ~NGX_HTTP_COPY_BUFFERED; |
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149 |
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150 } else { |
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151 r->buffered |= NGX_HTTP_COPY_BUFFERED; |
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152 } |
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154 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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155 "http copy filter: %i \"%V?%V\"", rc, &r->uri, &r->args); |
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156 |
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157 return rc; |
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158 } |
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159 |
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160 |
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161 #if (NGX_HAVE_FILE_AIO) |
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162 |
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163 static void |
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164 ngx_http_copy_aio_handler(ngx_output_chain_ctx_t *ctx, ngx_file_t *file) |
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165 { |
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166 ngx_http_request_t *r; |
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167 |
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168 r = ctx->filter_ctx; |
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169 |
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170 file->aio->data = r; |
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171 file->aio->handler = ngx_http_copy_aio_event_handler; |
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172 |
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173 r->main->blocked++; |
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174 r->aio = 1; |
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175 ctx->aio = 1; |
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176 } |
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177 |
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178 |
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179 static void |
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180 ngx_http_copy_aio_event_handler(ngx_event_t *ev) |
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181 { |
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182 ngx_event_aio_t *aio; |
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183 ngx_connection_t *c; |
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184 ngx_http_request_t *r; |
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185 |
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186 aio = ev->data; |
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187 r = aio->data; |
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188 c = r->connection; |
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189 |
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190 ngx_http_set_log_request(c->log, r); |
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191 |
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192 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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193 "http aio: \"%V?%V\"", &r->uri, &r->args); |
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194 |
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195 r->main->blocked--; |
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196 r->aio = 0; |
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197 |
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198 r->write_event_handler(r); |
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199 |
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200 ngx_http_run_posted_requests(c); |
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201 } |
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202 |
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203 #endif |
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204 |
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205 |
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206 #if (NGX_THREADS) |
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207 |
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208 static ngx_int_t |
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209 ngx_http_copy_thread_handler(ngx_thread_task_t *task, ngx_file_t *file) |
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210 { |
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211 ngx_str_t name; |
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212 ngx_connection_t *c; |
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213 ngx_thread_pool_t *tp; |
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214 ngx_http_request_t *r; |
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215 ngx_output_chain_ctx_t *ctx; |
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216 ngx_http_core_loc_conf_t *clcf; |
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217 |
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218 r = file->thread_ctx; |
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219 |
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220 if (r->aio) { |
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221 /* |
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222 * tolerate sendfile() calls if another operation is already |
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223 * running; this can happen due to subrequests, multiple calls |
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224 * of the next body filter from a filter, or in HTTP/2 due to |
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225 * a write event on the main connection |
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226 */ |
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227 |
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228 c = r->connection; |
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229 |
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230 #if (NGX_HTTP_V2) |
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231 if (r->stream) { |
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232 c = r->stream->connection->connection; |
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233 } |
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234 #endif |
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235 |
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236 if (task == c->sendfile_task) { |
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237 return NGX_OK; |
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238 } |
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239 } |
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240 |
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241 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); |
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242 tp = clcf->thread_pool; |
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243 |
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244 if (tp == NULL) { |
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245 if (ngx_http_complex_value(r, clcf->thread_pool_value, &name) |
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246 != NGX_OK) |
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247 { |
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248 return NGX_ERROR; |
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249 } |
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250 |
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251 tp = ngx_thread_pool_get((ngx_cycle_t *) ngx_cycle, &name); |
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252 |
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253 if (tp == NULL) { |
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254 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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255 "thread pool \"%V\" not found", &name); |
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256 return NGX_ERROR; |
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257 } |
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258 } |
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259 |
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260 task->event.data = r; |
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261 task->event.handler = ngx_http_copy_thread_event_handler; |
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262 |
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263 if (ngx_thread_task_post(tp, task) != NGX_OK) { |
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264 return NGX_ERROR; |
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265 } |
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266 |
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267 r->main->blocked++; |
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268 r->aio = 1; |
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269 |
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270 ctx = ngx_http_get_module_ctx(r, ngx_http_copy_filter_module); |
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271 ctx->aio = 1; |
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272 |
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273 return NGX_OK; |
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274 } |
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275 |
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276 |
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277 static void |
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278 ngx_http_copy_thread_event_handler(ngx_event_t *ev) |
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279 { |
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280 ngx_connection_t *c; |
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281 ngx_http_request_t *r; |
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282 |
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283 r = ev->data; |
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284 c = r->connection; |
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285 |
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286 ngx_http_set_log_request(c->log, r); |
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287 |
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288 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, |
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289 "http thread: \"%V?%V\"", &r->uri, &r->args); |
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290 |
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291 r->main->blocked--; |
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292 r->aio = 0; |
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293 |
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294 #if (NGX_HTTP_V2) |
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295 |
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296 if (r->stream) { |
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297 /* |
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298 * for HTTP/2, update write event to make sure processing will |
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299 * reach the main connection to handle sendfile() in threads |
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300 */ |
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301 |
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302 c->write->ready = 1; |
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303 c->write->active = 0; |
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304 } |
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305 |
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306 #endif |
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307 |
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308 if (r->done) { |
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309 /* |
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310 * trigger connection event handler if the subrequest was |
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311 * already finalized; this can happen if the handler is used |
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312 * for sendfile() in threads |
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313 */ |
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314 |
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315 c->write->handler(c->write); |
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316 |
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317 } else { |
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318 r->write_event_handler(r); |
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319 ngx_http_run_posted_requests(c); |
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320 } |
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321 } |
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322 |
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323 #endif |
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324 |
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325 |
501 | 326 static void * |
327 ngx_http_copy_filter_create_conf(ngx_conf_t *cf) | |
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328 { |
334
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329 ngx_http_copy_filter_conf_t *conf; |
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330 |
501 | 331 conf = ngx_palloc(cf->pool, sizeof(ngx_http_copy_filter_conf_t)); |
332 if (conf == NULL) { | |
333 return NULL; | |
334 } | |
9
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335 |
141
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336 conf->bufs.num = 0; |
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337 |
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338 return conf; |
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339 } |
44
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340 |
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341 |
501 | 342 static char * |
343 ngx_http_copy_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
44
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344 { |
334
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345 ngx_http_copy_filter_conf_t *prev = parent; |
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346 ngx_http_copy_filter_conf_t *conf = child; |
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347 |
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348 ngx_conf_merge_bufs_value(conf->bufs, prev->bufs, 2, 32768); |
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349 |
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350 return NULL; |
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351 } |
334
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352 |
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353 |
501 | 354 static ngx_int_t |
681 | 355 ngx_http_copy_filter_init(ngx_conf_t *cf) |
334
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356 { |
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357 ngx_http_next_body_filter = ngx_http_top_body_filter; |
334
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358 ngx_http_top_body_filter = ngx_http_copy_filter; |
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359 |
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360 return NGX_OK; |
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361 } |
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362 |