Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 4517:50143b8fb95f stable-1.0
Merge of r4500: fixed spelling in single-line comments.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 05 Mar 2012 13:26:40 +0000 |
parents | 8bb695c05870 |
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rev | line source |
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980 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
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4 * Copyright (C) Nginx, Inc. |
980 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
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14 u_char color; |
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15 u_char dummy; |
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16 u_short len; |
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17 ngx_queue_t queue; |
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18 ngx_msec_t last; |
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19 /* integer value, 1 corresponds to 0.001 r/s */ |
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20 ngx_uint_t excess; |
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21 u_char data[1]; |
2294 | 22 } ngx_http_limit_req_node_t; |
980 | 23 |
24 | |
25 typedef struct { | |
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26 ngx_rbtree_t rbtree; |
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27 ngx_rbtree_node_t sentinel; |
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28 ngx_queue_t queue; |
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29 } ngx_http_limit_req_shctx_t; |
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30 |
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31 |
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32 typedef struct { |
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33 ngx_http_limit_req_shctx_t *sh; |
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34 ngx_slab_pool_t *shpool; |
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35 /* integer value, 1 corresponds to 0.001 r/s */ |
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36 ngx_uint_t rate; |
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37 ngx_int_t index; |
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38 ngx_str_t var; |
2294 | 39 } ngx_http_limit_req_ctx_t; |
987 | 40 |
41 | |
42 typedef struct { | |
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43 ngx_shm_zone_t *shm_zone; |
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44 /* integer value, 1 corresponds to 0.001 r/s */ |
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45 ngx_uint_t burst; |
3185 | 46 ngx_uint_t limit_log_level; |
47 ngx_uint_t delay_log_level; | |
48 | |
49 ngx_uint_t nodelay; /* unsigned nodelay:1 */ | |
2294 | 50 } ngx_http_limit_req_conf_t; |
980 | 51 |
52 | |
2294 | 53 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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54 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, |
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55 ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep); |
2294 | 56 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
57 ngx_uint_t n); | |
980 | 58 |
2294 | 59 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
60 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
980 | 61 void *child); |
2294 | 62 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
980 | 63 void *conf); |
2294 | 64 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
980 | 65 void *conf); |
2294 | 66 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
980 | 67 |
68 | |
3185 | 69 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = { |
70 { ngx_string("info"), NGX_LOG_INFO }, | |
71 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
72 { ngx_string("warn"), NGX_LOG_WARN }, | |
73 { ngx_string("error"), NGX_LOG_ERR }, | |
74 { ngx_null_string, 0 } | |
75 }; | |
76 | |
77 | |
2294 | 78 static ngx_command_t ngx_http_limit_req_commands[] = { |
980 | 79 |
2294 | 80 { ngx_string("limit_req_zone"), |
987 | 81 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
2294 | 82 ngx_http_limit_req_zone, |
980 | 83 0, |
84 0, | |
85 NULL }, | |
86 | |
2294 | 87 { ngx_string("limit_req"), |
88 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
89 ngx_http_limit_req, | |
980 | 90 NGX_HTTP_LOC_CONF_OFFSET, |
91 0, | |
92 NULL }, | |
93 | |
3185 | 94 { ngx_string("limit_req_log_level"), |
95 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
96 ngx_conf_set_enum_slot, | |
97 NGX_HTTP_LOC_CONF_OFFSET, | |
98 offsetof(ngx_http_limit_req_conf_t, limit_log_level), | |
99 &ngx_http_limit_req_log_levels }, | |
100 | |
980 | 101 ngx_null_command |
102 }; | |
103 | |
104 | |
2294 | 105 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
980 | 106 NULL, /* preconfiguration */ |
2294 | 107 ngx_http_limit_req_init, /* postconfiguration */ |
980 | 108 |
109 NULL, /* create main configuration */ | |
110 NULL, /* init main configuration */ | |
111 | |
112 NULL, /* create server configuration */ | |
113 NULL, /* merge server configuration */ | |
114 | |
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115 ngx_http_limit_req_create_conf, /* create location configuration */ |
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116 ngx_http_limit_req_merge_conf /* merge location configuration */ |
980 | 117 }; |
118 | |
119 | |
2294 | 120 ngx_module_t ngx_http_limit_req_module = { |
980 | 121 NGX_MODULE_V1, |
2294 | 122 &ngx_http_limit_req_module_ctx, /* module context */ |
123 ngx_http_limit_req_commands, /* module directives */ | |
980 | 124 NGX_HTTP_MODULE, /* module type */ |
125 NULL, /* init master */ | |
126 NULL, /* init module */ | |
127 NULL, /* init process */ | |
128 NULL, /* init thread */ | |
129 NULL, /* exit thread */ | |
130 NULL, /* exit process */ | |
131 NULL, /* exit master */ | |
132 NGX_MODULE_V1_PADDING | |
133 }; | |
134 | |
135 | |
136 static ngx_int_t | |
2294 | 137 ngx_http_limit_req_handler(ngx_http_request_t *r) |
980 | 138 { |
2294 | 139 size_t len, n; |
140 uint32_t hash; | |
141 ngx_int_t rc; | |
2313 | 142 ngx_uint_t excess; |
2294 | 143 ngx_time_t *tp; |
144 ngx_rbtree_node_t *node; | |
145 ngx_http_variable_value_t *vv; | |
146 ngx_http_limit_req_ctx_t *ctx; | |
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147 ngx_http_limit_req_node_t *lr; |
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148 ngx_http_limit_req_conf_t *lrcf; |
980 | 149 |
2294 | 150 if (r->main->limit_req_set) { |
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151 return NGX_DECLINED; |
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152 } |
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153 |
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154 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
980 | 155 |
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156 if (lrcf->shm_zone == NULL) { |
980 | 157 return NGX_DECLINED; |
158 } | |
159 | |
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160 ctx = lrcf->shm_zone->data; |
987 | 161 |
162 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
980 | 163 |
164 if (vv == NULL || vv->not_found) { | |
165 return NGX_DECLINED; | |
166 } | |
167 | |
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168 len = vv->len; |
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169 |
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170 if (len == 0) { |
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171 return NGX_DECLINED; |
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172 } |
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173 |
2294 | 174 if (len > 65535) { |
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175 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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176 "the value of the \"%V\" variable " |
2294 | 177 "is more than 65535 bytes: \"%v\"", |
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178 &ctx->var, vv); |
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179 return NGX_DECLINED; |
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180 } |
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181 |
2294 | 182 r->main->limit_req_set = 1; |
980 | 183 |
184 hash = ngx_crc32_short(vv->data, len); | |
185 | |
2294 | 186 ngx_shmtx_lock(&ctx->shpool->mutex); |
187 | |
188 ngx_http_limit_req_expire(ctx, 1); | |
189 | |
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190 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &excess); |
980 | 191 |
2313 | 192 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
2973 | 193 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000); |
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194 |
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195 if (rc == NGX_DECLINED) { |
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196 |
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197 n = offsetof(ngx_rbtree_node_t, color) |
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198 + offsetof(ngx_http_limit_req_node_t, data) |
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199 + len; |
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200 |
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201 node = ngx_slab_alloc_locked(ctx->shpool, n); |
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202 if (node == NULL) { |
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203 |
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204 ngx_http_limit_req_expire(ctx, 0); |
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205 |
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206 node = ngx_slab_alloc_locked(ctx->shpool, n); |
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207 if (node == NULL) { |
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208 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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209 return NGX_HTTP_SERVICE_UNAVAILABLE; |
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210 } |
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211 } |
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212 |
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213 lr = (ngx_http_limit_req_node_t *) &node->color; |
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214 |
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215 node->key = hash; |
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216 lr->len = (u_char) len; |
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217 |
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218 tp = ngx_timeofday(); |
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219 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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220 |
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221 lr->excess = 0; |
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222 ngx_memcpy(lr->data, vv->data, len); |
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223 |
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224 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
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225 |
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226 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
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227 |
2294 | 228 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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229 |
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230 return NGX_DECLINED; |
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231 } |
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232 |
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233 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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234 |
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235 if (rc == NGX_OK) { |
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236 return NGX_DECLINED; |
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237 } |
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238 |
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239 if (rc == NGX_BUSY) { |
3185 | 240 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, |
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241 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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242 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
980 | 243 |
244 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
245 } | |
246 | |
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247 /* rc == NGX_AGAIN */ |
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248 |
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249 if (lrcf->nodelay) { |
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250 return NGX_DECLINED; |
2294 | 251 } |
252 | |
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253 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, |
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254 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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255 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
2294 | 256 |
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257 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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258 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
2294 | 259 } |
260 | |
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261 r->read_event_handler = ngx_http_test_reading; |
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262 r->write_event_handler = ngx_http_limit_req_delay; |
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263 ngx_add_timer(r->connection->write, |
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264 (ngx_msec_t) excess * 1000 / ctx->rate); |
2294 | 265 |
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266 return NGX_AGAIN; |
980 | 267 } |
268 | |
269 | |
270 static void | |
2294 | 271 ngx_http_limit_req_delay(ngx_http_request_t *r) |
272 { | |
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273 ngx_event_t *wev; |
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274 |
2294 | 275 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
2973 | 276 "limit_req delay"); |
2294 | 277 |
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278 wev = r->connection->write; |
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279 |
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280 if (!wev->timedout) { |
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281 |
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282 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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283 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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284 } |
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285 |
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286 return; |
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287 } |
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288 |
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289 wev->timedout = 0; |
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290 |
2294 | 291 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
292 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
293 return; | |
294 } | |
295 | |
296 r->read_event_handler = ngx_http_block_reading; | |
297 r->write_event_handler = ngx_http_core_run_phases; | |
298 | |
299 ngx_http_core_run_phases(r); | |
300 } | |
301 | |
302 | |
303 static void | |
304 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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305 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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306 { |
2294 | 307 ngx_rbtree_node_t **p; |
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308 ngx_http_limit_req_node_t *lrn, *lrnt; |
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309 |
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310 for ( ;; ) { |
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311 |
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312 if (node->key < temp->key) { |
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313 |
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314 p = &temp->left; |
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315 |
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316 } else if (node->key > temp->key) { |
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317 |
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318 p = &temp->right; |
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319 |
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320 } else { /* node->key == temp->key */ |
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321 |
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322 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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323 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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324 |
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325 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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326 ? &temp->left : &temp->right; |
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327 } |
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328 |
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329 if (*p == sentinel) { |
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330 break; |
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331 } |
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332 |
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333 temp = *p; |
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334 } |
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335 |
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336 *p = node; |
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337 node->parent = temp; |
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338 node->left = sentinel; |
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339 node->right = sentinel; |
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340 ngx_rbt_red(node); |
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341 } |
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342 |
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343 |
2294 | 344 static ngx_int_t |
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345 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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346 u_char *data, size_t len, ngx_uint_t *ep) |
980 | 347 { |
2313 | 348 ngx_int_t rc, excess; |
2294 | 349 ngx_time_t *tp; |
350 ngx_msec_t now; | |
351 ngx_msec_int_t ms; | |
352 ngx_rbtree_node_t *node, *sentinel; | |
353 ngx_http_limit_req_ctx_t *ctx; | |
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354 ngx_http_limit_req_node_t *lr; |
2294 | 355 |
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356 ctx = lrcf->shm_zone->data; |
2294 | 357 |
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358 node = ctx->sh->rbtree.root; |
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359 sentinel = ctx->sh->rbtree.sentinel; |
980 | 360 |
2294 | 361 while (node != sentinel) { |
362 | |
363 if (hash < node->key) { | |
364 node = node->left; | |
365 continue; | |
366 } | |
367 | |
368 if (hash > node->key) { | |
369 node = node->right; | |
370 continue; | |
371 } | |
372 | |
373 /* hash == node->key */ | |
374 | |
4515 | 375 lr = (ngx_http_limit_req_node_t *) &node->color; |
980 | 376 |
4515 | 377 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
2294 | 378 |
4515 | 379 if (rc == 0) { |
380 ngx_queue_remove(&lr->queue); | |
381 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); | |
2294 | 382 |
4515 | 383 tp = ngx_timeofday(); |
3191 | 384 |
4515 | 385 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
386 ms = (ngx_msec_int_t) (now - lr->last); | |
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387 |
4515 | 388 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
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389 |
4515 | 390 if (excess < 0) { |
391 excess = 0; | |
2294 | 392 } |
393 | |
4515 | 394 *ep = excess; |
395 | |
396 if ((ngx_uint_t) excess > lrcf->burst) { | |
397 return NGX_BUSY; | |
398 } | |
399 | |
400 lr->excess = excess; | |
401 lr->last = now; | |
2294 | 402 |
4515 | 403 if (excess) { |
404 return NGX_AGAIN; | |
405 } | |
2294 | 406 |
4515 | 407 return NGX_OK; |
408 } | |
409 | |
410 node = (rc < 0) ? node->left : node->right; | |
980 | 411 } |
412 | |
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413 *ep = 0; |
2294 | 414 |
415 return NGX_DECLINED; | |
416 } | |
417 | |
418 | |
419 static void | |
420 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
421 { | |
2313 | 422 ngx_int_t excess; |
2294 | 423 ngx_time_t *tp; |
424 ngx_msec_t now; | |
425 ngx_queue_t *q; | |
426 ngx_msec_int_t ms; | |
427 ngx_rbtree_node_t *node; | |
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428 ngx_http_limit_req_node_t *lr; |
2294 | 429 |
430 tp = ngx_timeofday(); | |
431 | |
432 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
433 | |
434 /* | |
435 * n == 1 deletes one or two zero rate entries | |
436 * n == 0 deletes oldest entry by force | |
437 * and one or two zero rate entries | |
438 */ | |
439 | |
440 while (n < 3) { | |
441 | |
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442 if (ngx_queue_empty(&ctx->sh->queue)) { |
2294 | 443 return; |
444 } | |
445 | |
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446 q = ngx_queue_last(&ctx->sh->queue); |
2294 | 447 |
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448 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
2294 | 449 |
450 if (n++ != 0) { | |
451 | |
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452 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 453 ms = ngx_abs(ms); |
454 | |
455 if (ms < 60000) { | |
456 return; | |
457 } | |
458 | |
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459 excess = lr->excess - ctx->rate * ms / 1000; |
2294 | 460 |
2313 | 461 if (excess > 0) { |
2294 | 462 return; |
463 } | |
464 } | |
465 | |
466 ngx_queue_remove(q); | |
467 | |
468 node = (ngx_rbtree_node_t *) | |
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469 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
2294 | 470 |
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471 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
2294 | 472 |
473 ngx_slab_free_locked(ctx->shpool, node); | |
474 } | |
980 | 475 } |
476 | |
477 | |
478 static ngx_int_t | |
2294 | 479 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 480 { |
2294 | 481 ngx_http_limit_req_ctx_t *octx = data; |
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482 |
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483 size_t len; |
2294 | 484 ngx_http_limit_req_ctx_t *ctx; |
980 | 485 |
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486 ctx = shm_zone->data; |
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487 |
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488 if (octx) { |
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489 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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490 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
2294 | 491 "limit_req \"%V\" uses the \"%V\" variable " |
993
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492 "while previously it used the \"%V\" variable", |
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493 &shm_zone->shm.name, &ctx->var, &octx->var); |
993
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494 return NGX_ERROR; |
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495 } |
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496 |
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497 ctx->sh = octx->sh; |
2294 | 498 ctx->shpool = octx->shpool; |
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499 |
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500 return NGX_OK; |
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501 } |
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502 |
2294 | 503 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
980 | 504 |
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505 if (shm_zone->shm.exists) { |
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506 ctx->sh = ctx->shpool->data; |
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507 |
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508 return NGX_OK; |
980 | 509 } |
510 | |
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511 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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512 if (ctx->sh == NULL) { |
980 | 513 return NGX_ERROR; |
514 } | |
515 | |
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516 ctx->shpool->data = ctx->sh; |
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517 |
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518 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
2294 | 519 ngx_http_limit_req_rbtree_insert_value); |
520 | |
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521 ngx_queue_init(&ctx->sh->queue); |
980 | 522 |
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523 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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524 |
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525 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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526 if (ctx->shpool->log_ctx == NULL) { |
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527 return NGX_ERROR; |
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528 } |
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529 |
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530 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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531 &shm_zone->shm.name); |
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532 |
980 | 533 return NGX_OK; |
534 } | |
535 | |
536 | |
537 static void * | |
2294 | 538 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
980 | 539 { |
2294 | 540 ngx_http_limit_req_conf_t *conf; |
980 | 541 |
2294 | 542 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
980 | 543 if (conf == NULL) { |
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544 return NULL; |
980 | 545 } |
546 | |
547 /* | |
548 * set by ngx_pcalloc(): | |
549 * | |
550 * conf->shm_zone = NULL; | |
2375 | 551 * conf->burst = 0; |
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552 * conf->nodelay = 0; |
980 | 553 */ |
554 | |
3185 | 555 conf->limit_log_level = NGX_CONF_UNSET_UINT; |
556 | |
980 | 557 return conf; |
558 } | |
559 | |
560 | |
561 static char * | |
2294 | 562 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
980 | 563 { |
2294 | 564 ngx_http_limit_req_conf_t *prev = parent; |
565 ngx_http_limit_req_conf_t *conf = child; | |
980 | 566 |
567 if (conf->shm_zone == NULL) { | |
4440 | 568 conf->shm_zone = prev->shm_zone; |
569 conf->burst = prev->burst; | |
570 conf->nodelay = prev->nodelay; | |
980 | 571 } |
572 | |
3185 | 573 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, |
574 NGX_LOG_ERR); | |
575 | |
576 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ? | |
577 NGX_LOG_INFO : conf->limit_log_level + 1; | |
578 | |
980 | 579 return NGX_CONF_OK; |
580 } | |
581 | |
582 | |
583 static char * | |
2294 | 584 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 585 { |
2294 | 586 u_char *p; |
587 size_t size, len; | |
588 ngx_str_t *value, name, s; | |
589 ngx_int_t rate, scale; | |
590 ngx_uint_t i; | |
591 ngx_shm_zone_t *shm_zone; | |
592 ngx_http_limit_req_ctx_t *ctx; | |
980 | 593 |
594 value = cf->args->elts; | |
595 | |
2294 | 596 ctx = NULL; |
597 size = 0; | |
598 rate = 1; | |
599 scale = 1; | |
600 name.len = 0; | |
601 | |
602 for (i = 1; i < cf->args->nelts; i++) { | |
603 | |
604 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
605 | |
606 name.data = value[i].data + 5; | |
607 | |
608 p = (u_char *) ngx_strchr(name.data, ':'); | |
609 | |
610 if (p) { | |
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611 *p = '\0'; |
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612 |
2294 | 613 name.len = p - name.data; |
614 | |
615 p++; | |
616 | |
617 s.len = value[i].data + value[i].len - p; | |
618 s.data = p; | |
619 | |
620 size = ngx_parse_size(&s); | |
621 if (size > 8191) { | |
622 continue; | |
623 } | |
624 } | |
625 | |
626 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
627 "invalid zone size \"%V\"", &value[i]); | |
628 return NGX_CONF_ERROR; | |
629 } | |
630 | |
631 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
632 | |
633 len = value[i].len; | |
634 p = value[i].data + len - 3; | |
987 | 635 |
2294 | 636 if (ngx_strncmp(p, "r/s", 3) == 0) { |
637 scale = 1; | |
638 len -= 3; | |
639 | |
640 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
641 scale = 60; | |
642 len -= 3; | |
643 } | |
644 | |
645 rate = ngx_atoi(value[i].data + 5, len - 5); | |
646 if (rate <= NGX_ERROR) { | |
647 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
648 "invalid rate \"%V\"", &value[i]); | |
649 return NGX_CONF_ERROR; | |
650 } | |
651 | |
652 continue; | |
653 } | |
654 | |
655 if (value[i].data[0] == '$') { | |
987 | 656 |
2294 | 657 value[i].len--; |
658 value[i].data++; | |
659 | |
660 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
661 if (ctx == NULL) { | |
662 return NGX_CONF_ERROR; | |
663 } | |
664 | |
665 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
666 if (ctx->index == NGX_ERROR) { | |
667 return NGX_CONF_ERROR; | |
668 } | |
669 | |
670 ctx->var = value[i]; | |
671 | |
672 continue; | |
673 } | |
674 | |
675 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
676 "invalid parameter \"%V\"", &value[i]); | |
987 | 677 return NGX_CONF_ERROR; |
678 } | |
679 | |
2294 | 680 if (name.len == 0 || size == 0) { |
681 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
682 "\"%V\" must have \"zone\" parameter", | |
683 &cmd->name); | |
987 | 684 return NGX_CONF_ERROR; |
685 } | |
686 | |
2294 | 687 if (ctx == NULL) { |
980 | 688 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 689 "no variable is defined for limit_req_zone \"%V\"", |
690 &cmd->name); | |
980 | 691 return NGX_CONF_ERROR; |
692 } | |
693 | |
2313 | 694 ctx->rate = rate * 1000 / scale; |
980 | 695 |
2294 | 696 shm_zone = ngx_shared_memory_add(cf, &name, size, |
697 &ngx_http_limit_req_module); | |
980 | 698 if (shm_zone == NULL) { |
699 return NGX_CONF_ERROR; | |
700 } | |
701 | |
987 | 702 if (shm_zone->data) { |
703 ctx = shm_zone->data; | |
704 | |
705 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
2294 | 706 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
707 &value[1], &ctx->var); | |
987 | 708 return NGX_CONF_ERROR; |
709 } | |
710 | |
2294 | 711 shm_zone->init = ngx_http_limit_req_init_zone; |
987 | 712 shm_zone->data = ctx; |
980 | 713 |
714 return NGX_CONF_OK; | |
715 } | |
716 | |
717 | |
718 static char * | |
2294 | 719 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 720 { |
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721 ngx_http_limit_req_conf_t *lrcf = conf; |
980 | 722 |
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723 ngx_int_t burst; |
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724 ngx_str_t *value, s; |
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725 ngx_uint_t i; |
2294 | 726 |
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727 if (lrcf->shm_zone) { |
2294 | 728 return "is duplicate"; |
729 } | |
980 | 730 |
731 value = cf->args->elts; | |
732 | |
2294 | 733 burst = 0; |
734 | |
735 for (i = 1; i < cf->args->nelts; i++) { | |
736 | |
737 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
738 | |
739 s.len = value[i].len - 5; | |
740 s.data = value[i].data + 5; | |
741 | |
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742 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
2294 | 743 &ngx_http_limit_req_module); |
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744 if (lrcf->shm_zone == NULL) { |
2294 | 745 return NGX_CONF_ERROR; |
746 } | |
747 | |
748 continue; | |
749 } | |
750 | |
751 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
752 | |
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753 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
2294 | 754 if (burst <= 0) { |
755 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
756 "invalid burst rate \"%V\"", &value[i]); | |
757 return NGX_CONF_ERROR; | |
758 } | |
759 | |
760 continue; | |
761 } | |
762 | |
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763 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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764 lrcf->nodelay = 1; |
2294 | 765 continue; |
766 } | |
767 | |
768 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
769 "invalid parameter \"%V\"", &value[i]); | |
980 | 770 return NGX_CONF_ERROR; |
771 } | |
772 | |
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773 if (lrcf->shm_zone == NULL) { |
980 | 774 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 775 "\"%V\" must have \"zone\" parameter", |
776 &cmd->name); | |
980 | 777 return NGX_CONF_ERROR; |
778 } | |
779 | |
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780 if (lrcf->shm_zone->data == NULL) { |
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781 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 782 "unknown limit_req_zone \"%V\"", |
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783 &lrcf->shm_zone->shm.name); |
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784 return NGX_CONF_ERROR; |
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785 } |
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786 |
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changeset
|
787 lrcf->burst = burst * 1000; |
980 | 788 |
789 return NGX_CONF_OK; | |
790 } | |
791 | |
792 | |
793 static ngx_int_t | |
2294 | 794 ngx_http_limit_req_init(ngx_conf_t *cf) |
980 | 795 { |
796 ngx_http_handler_pt *h; | |
797 ngx_http_core_main_conf_t *cmcf; | |
798 | |
799 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
800 | |
801 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
802 if (h == NULL) { | |
803 return NGX_ERROR; | |
804 } | |
805 | |
2294 | 806 *h = ngx_http_limit_req_handler; |
980 | 807 |
808 return NGX_OK; | |
809 } |