Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 3185:30570a5b9bb0
limit_req_log_level
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 06 Oct 2009 10:14:21 +0000 |
| parents | b87542338ac3 |
| children | 30f841e2536d |
| rev | line source |
|---|---|
| 980 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_http.h> | |
| 10 | |
| 11 | |
| 12 typedef struct { | |
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13 u_char color; |
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14 u_char dummy; |
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15 u_short len; |
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16 ngx_queue_t queue; |
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17 ngx_msec_t last; |
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18 /* integer value, 1 corresponds to 0.001 r/s */ |
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19 ngx_uint_t excess; |
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20 u_char data[1]; |
| 2294 | 21 } ngx_http_limit_req_node_t; |
| 980 | 22 |
| 23 | |
| 24 typedef struct { | |
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25 ngx_rbtree_t rbtree; |
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26 ngx_rbtree_node_t sentinel; |
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27 ngx_queue_t queue; |
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28 } ngx_http_limit_req_shctx_t; |
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29 |
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30 |
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31 typedef struct { |
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32 ngx_http_limit_req_shctx_t *sh; |
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33 ngx_slab_pool_t *shpool; |
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34 /* integer value, 1 corresponds to 0.001 r/s */ |
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35 ngx_uint_t rate; |
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36 ngx_int_t index; |
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37 ngx_str_t var; |
| 2294 | 38 } ngx_http_limit_req_ctx_t; |
| 987 | 39 |
| 40 | |
| 41 typedef struct { | |
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42 ngx_shm_zone_t *shm_zone; |
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43 /* integer value, 1 corresponds to 0.001 r/s */ |
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44 ngx_uint_t burst; |
| 3185 | 45 ngx_uint_t limit_log_level; |
| 46 ngx_uint_t delay_log_level; | |
| 47 | |
| 48 ngx_uint_t nodelay; /* unsigned nodelay:1 */ | |
| 2294 | 49 } ngx_http_limit_req_conf_t; |
| 980 | 50 |
| 51 | |
| 2294 | 52 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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53 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, |
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54 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lrp); |
| 2294 | 55 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
| 56 ngx_uint_t n); | |
| 980 | 57 |
| 2294 | 58 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
| 59 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
| 980 | 60 void *child); |
| 2294 | 61 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 62 void *conf); |
| 2294 | 63 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 64 void *conf); |
| 2294 | 65 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
| 980 | 66 |
| 67 | |
| 3185 | 68 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = { |
| 69 { ngx_string("info"), NGX_LOG_INFO }, | |
| 70 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
| 71 { ngx_string("warn"), NGX_LOG_WARN }, | |
| 72 { ngx_string("error"), NGX_LOG_ERR }, | |
| 73 { ngx_null_string, 0 } | |
| 74 }; | |
| 75 | |
| 76 | |
| 2294 | 77 static ngx_command_t ngx_http_limit_req_commands[] = { |
| 980 | 78 |
| 2294 | 79 { ngx_string("limit_req_zone"), |
| 987 | 80 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
| 2294 | 81 ngx_http_limit_req_zone, |
| 980 | 82 0, |
| 83 0, | |
| 84 NULL }, | |
| 85 | |
| 2294 | 86 { ngx_string("limit_req"), |
| 87 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
| 88 ngx_http_limit_req, | |
| 980 | 89 NGX_HTTP_LOC_CONF_OFFSET, |
| 90 0, | |
| 91 NULL }, | |
| 92 | |
| 3185 | 93 { ngx_string("limit_req_log_level"), |
| 94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 95 ngx_conf_set_enum_slot, | |
| 96 NGX_HTTP_LOC_CONF_OFFSET, | |
| 97 offsetof(ngx_http_limit_req_conf_t, limit_log_level), | |
| 98 &ngx_http_limit_req_log_levels }, | |
| 99 | |
| 980 | 100 ngx_null_command |
| 101 }; | |
| 102 | |
| 103 | |
| 2294 | 104 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
| 980 | 105 NULL, /* preconfiguration */ |
| 2294 | 106 ngx_http_limit_req_init, /* postconfiguration */ |
| 980 | 107 |
| 108 NULL, /* create main configuration */ | |
| 109 NULL, /* init main configuration */ | |
| 110 | |
| 111 NULL, /* create server configuration */ | |
| 112 NULL, /* merge server configuration */ | |
| 113 | |
| 2294 | 114 ngx_http_limit_req_create_conf, /* create location configration */ |
| 115 ngx_http_limit_req_merge_conf /* merge location configration */ | |
| 980 | 116 }; |
| 117 | |
| 118 | |
| 2294 | 119 ngx_module_t ngx_http_limit_req_module = { |
| 980 | 120 NGX_MODULE_V1, |
| 2294 | 121 &ngx_http_limit_req_module_ctx, /* module context */ |
| 122 ngx_http_limit_req_commands, /* module directives */ | |
| 980 | 123 NGX_HTTP_MODULE, /* module type */ |
| 124 NULL, /* init master */ | |
| 125 NULL, /* init module */ | |
| 126 NULL, /* init process */ | |
| 127 NULL, /* init thread */ | |
| 128 NULL, /* exit thread */ | |
| 129 NULL, /* exit process */ | |
| 130 NULL, /* exit master */ | |
| 131 NGX_MODULE_V1_PADDING | |
| 132 }; | |
| 133 | |
| 134 | |
| 135 static ngx_int_t | |
| 2294 | 136 ngx_http_limit_req_handler(ngx_http_request_t *r) |
| 980 | 137 { |
| 2294 | 138 size_t len, n; |
| 139 uint32_t hash; | |
| 140 ngx_int_t rc; | |
| 2313 | 141 ngx_uint_t excess; |
| 2294 | 142 ngx_time_t *tp; |
| 143 ngx_rbtree_node_t *node; | |
| 144 ngx_http_variable_value_t *vv; | |
| 145 ngx_http_limit_req_ctx_t *ctx; | |
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146 ngx_http_limit_req_node_t *lr; |
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147 ngx_http_limit_req_conf_t *lrcf; |
| 980 | 148 |
| 2294 | 149 if (r->main->limit_req_set) { |
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150 return NGX_DECLINED; |
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151 } |
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152 |
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153 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
| 980 | 154 |
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155 if (lrcf->shm_zone == NULL) { |
| 980 | 156 return NGX_DECLINED; |
| 157 } | |
| 158 | |
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159 ctx = lrcf->shm_zone->data; |
| 987 | 160 |
| 161 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
| 980 | 162 |
| 163 if (vv == NULL || vv->not_found) { | |
| 164 return NGX_DECLINED; | |
| 165 } | |
| 166 | |
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167 len = vv->len; |
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168 |
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169 if (len == 0) { |
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170 return NGX_DECLINED; |
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171 } |
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172 |
| 2294 | 173 if (len > 65535) { |
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174 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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175 "the value of the \"%V\" variable " |
| 2294 | 176 "is more than 65535 bytes: \"%v\"", |
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177 &ctx->var, vv); |
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178 return NGX_DECLINED; |
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179 } |
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180 |
| 2294 | 181 r->main->limit_req_set = 1; |
| 980 | 182 |
| 183 hash = ngx_crc32_short(vv->data, len); | |
| 184 | |
| 2294 | 185 ngx_shmtx_lock(&ctx->shpool->mutex); |
| 186 | |
| 187 ngx_http_limit_req_expire(ctx, 1); | |
| 188 | |
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189 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr); |
| 2294 | 190 |
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191 if (lr) { |
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192 ngx_queue_remove(&lr->queue); |
| 2294 | 193 |
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194 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
| 2294 | 195 |
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196 excess = lr->excess; |
| 2294 | 197 |
| 198 } else { | |
| 2313 | 199 excess = 0; |
| 980 | 200 } |
| 201 | |
| 2313 | 202 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 2973 | 203 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000); |
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204 |
| 2294 | 205 if (rc == NGX_BUSY) { |
| 206 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
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207 |
| 3185 | 208 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, |
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209 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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210 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
| 980 | 211 |
| 212 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 213 } | |
| 214 | |
| 2294 | 215 if (rc == NGX_AGAIN) { |
| 216 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 217 | |
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218 if (lrcf->nodelay) { |
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219 return NGX_DECLINED; |
| 2294 | 220 } |
| 221 | |
| 3185 | 222 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, |
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223 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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224 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
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225 |
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226 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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227 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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228 } |
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229 |
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230 r->read_event_handler = ngx_http_test_reading; |
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231 r->write_event_handler = ngx_http_limit_req_delay; |
| 2313 | 232 ngx_add_timer(r->connection->write, (ngx_msec_t) excess); |
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233 |
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234 return NGX_AGAIN; |
| 2294 | 235 } |
| 236 | |
| 237 if (rc == NGX_OK) { | |
| 238 goto done; | |
| 239 } | |
| 240 | |
| 241 /* rc == NGX_DECLINED */ | |
| 242 | |
| 243 n = offsetof(ngx_rbtree_node_t, color) | |
| 244 + offsetof(ngx_http_limit_req_node_t, data) | |
| 245 + len; | |
| 246 | |
| 247 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 248 if (node == NULL) { | |
| 249 | |
| 250 ngx_http_limit_req_expire(ctx, 0); | |
| 251 | |
| 252 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 253 if (node == NULL) { | |
| 254 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 255 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 256 } | |
| 257 } | |
| 258 | |
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259 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 260 |
| 261 node->key = hash; | |
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262 lr->len = (u_char) len; |
| 2294 | 263 |
| 264 tp = ngx_timeofday(); | |
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265 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
| 2294 | 266 |
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267 lr->excess = 0; |
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268 ngx_memcpy(lr->data, vv->data, len); |
| 980 | 269 |
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270 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
| 980 | 271 |
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272 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
| 2294 | 273 |
| 980 | 274 done: |
| 275 | |
| 2294 | 276 ngx_shmtx_unlock(&ctx->shpool->mutex); |
| 980 | 277 |
| 278 return NGX_DECLINED; | |
| 279 } | |
| 280 | |
| 281 | |
| 282 static void | |
| 2294 | 283 ngx_http_limit_req_delay(ngx_http_request_t *r) |
| 284 { | |
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285 ngx_event_t *wev; |
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286 |
| 2294 | 287 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 2973 | 288 "limit_req delay"); |
| 2294 | 289 |
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290 wev = r->connection->write; |
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291 |
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292 if (!wev->timedout) { |
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293 |
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294 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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295 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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296 } |
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297 |
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298 return; |
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299 } |
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300 |
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301 wev->timedout = 0; |
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302 |
| 2294 | 303 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
| 304 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| 305 return; | |
| 306 } | |
| 307 | |
| 308 r->read_event_handler = ngx_http_block_reading; | |
| 309 r->write_event_handler = ngx_http_core_run_phases; | |
| 310 | |
| 311 ngx_http_core_run_phases(r); | |
| 312 } | |
| 313 | |
| 314 | |
| 315 static void | |
| 316 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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317 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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318 { |
| 2294 | 319 ngx_rbtree_node_t **p; |
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320 ngx_http_limit_req_node_t *lrn, *lrnt; |
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321 |
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322 for ( ;; ) { |
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323 |
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324 if (node->key < temp->key) { |
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325 |
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326 p = &temp->left; |
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327 |
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328 } else if (node->key > temp->key) { |
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329 |
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330 p = &temp->right; |
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331 |
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332 } else { /* node->key == temp->key */ |
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333 |
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334 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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335 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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336 |
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337 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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338 ? &temp->left : &temp->right; |
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339 } |
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340 |
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341 if (*p == sentinel) { |
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342 break; |
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343 } |
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344 |
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345 temp = *p; |
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346 } |
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347 |
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348 *p = node; |
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349 node->parent = temp; |
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350 node->left = sentinel; |
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351 node->right = sentinel; |
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352 ngx_rbt_red(node); |
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353 } |
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354 |
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355 |
| 2294 | 356 static ngx_int_t |
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357 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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358 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp) |
| 980 | 359 { |
| 2313 | 360 ngx_int_t rc, excess; |
| 2294 | 361 ngx_time_t *tp; |
| 362 ngx_msec_t now; | |
| 363 ngx_msec_int_t ms; | |
| 364 ngx_rbtree_node_t *node, *sentinel; | |
| 365 ngx_http_limit_req_ctx_t *ctx; | |
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366 ngx_http_limit_req_node_t *lr; |
| 2294 | 367 |
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368 ctx = lrcf->shm_zone->data; |
| 2294 | 369 |
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370 node = ctx->sh->rbtree.root; |
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371 sentinel = ctx->sh->rbtree.sentinel; |
| 980 | 372 |
| 2294 | 373 while (node != sentinel) { |
| 374 | |
| 375 if (hash < node->key) { | |
| 376 node = node->left; | |
| 377 continue; | |
| 378 } | |
| 379 | |
| 380 if (hash > node->key) { | |
| 381 node = node->right; | |
| 382 continue; | |
| 383 } | |
| 384 | |
| 385 /* hash == node->key */ | |
| 386 | |
| 387 do { | |
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388 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 389 |
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390 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
| 2294 | 391 |
| 392 if (rc == 0) { | |
| 393 | |
| 394 tp = ngx_timeofday(); | |
| 980 | 395 |
| 2294 | 396 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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397 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 398 |
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399 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
| 2294 | 400 |
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401 if ((ngx_uint_t) excess > lrcf->burst) { |
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402 *lrp = lr; |
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403 return NGX_BUSY; |
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404 } |
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405 |
| 2313 | 406 if (excess < 0) { |
| 407 excess = 0; | |
| 2294 | 408 } |
| 409 | |
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410 lr->excess = excess; |
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411 lr->last = now; |
| 980 | 412 |
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413 *lrp = lr; |
| 2294 | 414 |
| 2313 | 415 if (excess) { |
| 2294 | 416 return NGX_AGAIN; |
| 417 } | |
| 980 | 418 |
| 2294 | 419 return NGX_OK; |
| 420 } | |
| 421 | |
| 422 node = (rc < 0) ? node->left : node->right; | |
| 423 | |
| 424 } while (node != sentinel && hash == node->key); | |
| 425 | |
| 426 break; | |
| 980 | 427 } |
| 428 | |
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429 *lrp = NULL; |
| 2294 | 430 |
| 431 return NGX_DECLINED; | |
| 432 } | |
| 433 | |
| 434 | |
| 435 static void | |
| 436 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
| 437 { | |
| 2313 | 438 ngx_int_t excess; |
| 2294 | 439 ngx_time_t *tp; |
| 440 ngx_msec_t now; | |
| 441 ngx_queue_t *q; | |
| 442 ngx_msec_int_t ms; | |
| 443 ngx_rbtree_node_t *node; | |
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444 ngx_http_limit_req_node_t *lr; |
| 2294 | 445 |
| 446 tp = ngx_timeofday(); | |
| 447 | |
| 448 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
| 449 | |
| 450 /* | |
| 451 * n == 1 deletes one or two zero rate entries | |
| 452 * n == 0 deletes oldest entry by force | |
| 453 * and one or two zero rate entries | |
| 454 */ | |
| 455 | |
| 456 while (n < 3) { | |
| 457 | |
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458 if (ngx_queue_empty(&ctx->sh->queue)) { |
| 2294 | 459 return; |
| 460 } | |
| 461 | |
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462 q = ngx_queue_last(&ctx->sh->queue); |
| 2294 | 463 |
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464 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
| 2294 | 465 |
| 466 if (n++ != 0) { | |
| 467 | |
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468 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 469 ms = ngx_abs(ms); |
| 470 | |
| 471 if (ms < 60000) { | |
| 472 return; | |
| 473 } | |
| 474 | |
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475 excess = lr->excess - ctx->rate * ms / 1000; |
| 2294 | 476 |
| 2313 | 477 if (excess > 0) { |
| 2294 | 478 return; |
| 479 } | |
| 480 } | |
| 481 | |
| 482 ngx_queue_remove(q); | |
| 483 | |
| 484 node = (ngx_rbtree_node_t *) | |
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485 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
| 2294 | 486 |
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487 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
| 2294 | 488 |
| 489 ngx_slab_free_locked(ctx->shpool, node); | |
| 490 } | |
| 980 | 491 } |
| 492 | |
| 493 | |
| 494 static ngx_int_t | |
| 2294 | 495 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 496 { |
| 2294 | 497 ngx_http_limit_req_ctx_t *octx = data; |
|
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498 |
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499 size_t len; |
| 2294 | 500 ngx_http_limit_req_ctx_t *ctx; |
| 980 | 501 |
|
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502 ctx = shm_zone->data; |
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503 |
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504 if (octx) { |
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505 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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506 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 2294 | 507 "limit_req \"%V\" uses the \"%V\" variable " |
|
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508 "while previously it used the \"%V\" variable", |
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509 &shm_zone->shm.name, &ctx->var, &octx->var); |
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510 return NGX_ERROR; |
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511 } |
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512 |
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513 ctx->sh = octx->sh; |
| 2294 | 514 ctx->shpool = octx->shpool; |
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515 |
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516 return NGX_OK; |
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517 } |
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518 |
| 2294 | 519 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 980 | 520 |
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521 if (shm_zone->shm.exists) { |
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522 ctx->sh = ctx->shpool->data; |
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523 |
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524 return NGX_OK; |
| 980 | 525 } |
| 526 | |
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527 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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528 if (ctx->sh == NULL) { |
| 980 | 529 return NGX_ERROR; |
| 530 } | |
| 531 | |
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532 ctx->shpool->data = ctx->sh; |
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533 |
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534 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
| 2294 | 535 ngx_http_limit_req_rbtree_insert_value); |
| 536 | |
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537 ngx_queue_init(&ctx->sh->queue); |
| 980 | 538 |
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539 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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540 |
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541 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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542 if (ctx->shpool->log_ctx == NULL) { |
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543 return NGX_ERROR; |
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544 } |
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545 |
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546 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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547 &shm_zone->shm.name); |
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548 |
| 980 | 549 return NGX_OK; |
| 550 } | |
| 551 | |
| 552 | |
| 553 static void * | |
| 2294 | 554 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
| 980 | 555 { |
| 2294 | 556 ngx_http_limit_req_conf_t *conf; |
| 980 | 557 |
| 2294 | 558 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
| 980 | 559 if (conf == NULL) { |
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560 return NULL; |
| 980 | 561 } |
| 562 | |
| 563 /* | |
| 564 * set by ngx_pcalloc(): | |
| 565 * | |
| 566 * conf->shm_zone = NULL; | |
| 2375 | 567 * conf->burst = 0; |
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568 * conf->nodelay = 0; |
| 980 | 569 */ |
| 570 | |
| 3185 | 571 conf->limit_log_level = NGX_CONF_UNSET_UINT; |
| 572 | |
| 980 | 573 return conf; |
| 574 } | |
| 575 | |
| 576 | |
| 577 static char * | |
| 2294 | 578 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
| 980 | 579 { |
| 2294 | 580 ngx_http_limit_req_conf_t *prev = parent; |
| 581 ngx_http_limit_req_conf_t *conf = child; | |
| 980 | 582 |
| 583 if (conf->shm_zone == NULL) { | |
| 584 *conf = *prev; | |
| 585 } | |
| 586 | |
| 3185 | 587 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, |
| 588 NGX_LOG_ERR); | |
| 589 | |
| 590 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ? | |
| 591 NGX_LOG_INFO : conf->limit_log_level + 1; | |
| 592 | |
| 980 | 593 return NGX_CONF_OK; |
| 594 } | |
| 595 | |
| 596 | |
| 597 static char * | |
| 2294 | 598 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 599 { |
| 2294 | 600 u_char *p; |
| 601 size_t size, len; | |
| 602 ngx_str_t *value, name, s; | |
| 603 ngx_int_t rate, scale; | |
| 604 ngx_uint_t i; | |
| 605 ngx_shm_zone_t *shm_zone; | |
| 606 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 607 |
| 608 value = cf->args->elts; | |
| 609 | |
| 2294 | 610 ctx = NULL; |
| 611 size = 0; | |
| 612 rate = 1; | |
| 613 scale = 1; | |
| 614 name.len = 0; | |
| 615 | |
| 616 for (i = 1; i < cf->args->nelts; i++) { | |
| 617 | |
| 618 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 619 | |
| 620 name.data = value[i].data + 5; | |
| 621 | |
| 622 p = (u_char *) ngx_strchr(name.data, ':'); | |
| 623 | |
| 624 if (p) { | |
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625 *p = '\0'; |
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626 |
| 2294 | 627 name.len = p - name.data; |
| 628 | |
| 629 p++; | |
| 630 | |
| 631 s.len = value[i].data + value[i].len - p; | |
| 632 s.data = p; | |
| 633 | |
| 634 size = ngx_parse_size(&s); | |
| 635 if (size > 8191) { | |
| 636 continue; | |
| 637 } | |
| 638 } | |
| 639 | |
| 640 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 641 "invalid zone size \"%V\"", &value[i]); | |
| 642 return NGX_CONF_ERROR; | |
| 643 } | |
| 644 | |
| 645 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
| 646 | |
| 647 len = value[i].len; | |
| 648 p = value[i].data + len - 3; | |
| 987 | 649 |
| 2294 | 650 if (ngx_strncmp(p, "r/s", 3) == 0) { |
| 651 scale = 1; | |
| 652 len -= 3; | |
| 653 | |
| 654 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
| 655 scale = 60; | |
| 656 len -= 3; | |
| 657 } | |
| 658 | |
| 659 rate = ngx_atoi(value[i].data + 5, len - 5); | |
| 660 if (rate <= NGX_ERROR) { | |
| 661 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 662 "invalid rate \"%V\"", &value[i]); | |
| 663 return NGX_CONF_ERROR; | |
| 664 } | |
| 665 | |
| 666 continue; | |
| 667 } | |
| 668 | |
| 669 if (value[i].data[0] == '$') { | |
| 987 | 670 |
| 2294 | 671 value[i].len--; |
| 672 value[i].data++; | |
| 673 | |
| 674 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
| 675 if (ctx == NULL) { | |
| 676 return NGX_CONF_ERROR; | |
| 677 } | |
| 678 | |
| 679 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
| 680 if (ctx->index == NGX_ERROR) { | |
| 681 return NGX_CONF_ERROR; | |
| 682 } | |
| 683 | |
| 684 ctx->var = value[i]; | |
| 685 | |
| 686 continue; | |
| 687 } | |
| 688 | |
| 689 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 690 "invalid parameter \"%V\"", &value[i]); | |
| 987 | 691 return NGX_CONF_ERROR; |
| 692 } | |
| 693 | |
| 2294 | 694 if (name.len == 0 || size == 0) { |
| 695 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 696 "\"%V\" must have \"zone\" parameter", | |
| 697 &cmd->name); | |
| 987 | 698 return NGX_CONF_ERROR; |
| 699 } | |
| 700 | |
| 2294 | 701 if (ctx == NULL) { |
| 980 | 702 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 703 "no variable is defined for limit_req_zone \"%V\"", |
| 704 &cmd->name); | |
| 980 | 705 return NGX_CONF_ERROR; |
| 706 } | |
| 707 | |
| 2313 | 708 ctx->rate = rate * 1000 / scale; |
| 980 | 709 |
| 2294 | 710 shm_zone = ngx_shared_memory_add(cf, &name, size, |
| 711 &ngx_http_limit_req_module); | |
| 980 | 712 if (shm_zone == NULL) { |
| 713 return NGX_CONF_ERROR; | |
| 714 } | |
| 715 | |
| 987 | 716 if (shm_zone->data) { |
| 717 ctx = shm_zone->data; | |
| 718 | |
| 719 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 2294 | 720 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
| 721 &value[1], &ctx->var); | |
| 987 | 722 return NGX_CONF_ERROR; |
| 723 } | |
| 724 | |
| 2294 | 725 shm_zone->init = ngx_http_limit_req_init_zone; |
| 987 | 726 shm_zone->data = ctx; |
| 980 | 727 |
| 728 return NGX_CONF_OK; | |
| 729 } | |
| 730 | |
| 731 | |
| 732 static char * | |
| 2294 | 733 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 734 { |
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735 ngx_http_limit_req_conf_t *lrcf = conf; |
| 980 | 736 |
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737 ngx_int_t burst; |
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738 ngx_str_t *value, s; |
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739 ngx_uint_t i; |
| 2294 | 740 |
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741 if (lrcf->shm_zone) { |
| 2294 | 742 return "is duplicate"; |
| 743 } | |
| 980 | 744 |
| 745 value = cf->args->elts; | |
| 746 | |
| 2294 | 747 burst = 0; |
| 748 | |
| 749 for (i = 1; i < cf->args->nelts; i++) { | |
| 750 | |
| 751 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 752 | |
| 753 s.len = value[i].len - 5; | |
| 754 s.data = value[i].data + 5; | |
| 755 | |
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756 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
| 2294 | 757 &ngx_http_limit_req_module); |
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758 if (lrcf->shm_zone == NULL) { |
| 2294 | 759 return NGX_CONF_ERROR; |
| 760 } | |
| 761 | |
| 762 continue; | |
| 763 } | |
| 764 | |
| 765 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
| 766 | |
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767 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
| 2294 | 768 if (burst <= 0) { |
| 769 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 770 "invalid burst rate \"%V\"", &value[i]); | |
| 771 return NGX_CONF_ERROR; | |
| 772 } | |
| 773 | |
| 774 continue; | |
| 775 } | |
| 776 | |
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777 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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778 lrcf->nodelay = 1; |
| 2294 | 779 continue; |
| 780 } | |
| 781 | |
| 782 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 783 "invalid parameter \"%V\"", &value[i]); | |
| 980 | 784 return NGX_CONF_ERROR; |
| 785 } | |
| 786 | |
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787 if (lrcf->shm_zone == NULL) { |
| 980 | 788 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 789 "\"%V\" must have \"zone\" parameter", |
| 790 &cmd->name); | |
| 980 | 791 return NGX_CONF_ERROR; |
| 792 } | |
| 793 | |
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794 if (lrcf->shm_zone->data == NULL) { |
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795 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 796 "unknown limit_req_zone \"%V\"", |
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797 &lrcf->shm_zone->shm.name); |
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test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
798 return NGX_CONF_ERROR; |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
799 } |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
800 |
|
2374
7b11f9a1bfe1
rename "lz" to "lr" in variable names
Igor Sysoev <igor@sysoev.ru>
parents:
2313
diff
changeset
|
801 lrcf->burst = burst * 1000; |
| 980 | 802 |
| 803 return NGX_CONF_OK; | |
| 804 } | |
| 805 | |
| 806 | |
| 807 static ngx_int_t | |
| 2294 | 808 ngx_http_limit_req_init(ngx_conf_t *cf) |
| 980 | 809 { |
| 810 ngx_http_handler_pt *h; | |
| 811 ngx_http_core_main_conf_t *cmcf; | |
| 812 | |
| 813 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 814 | |
| 815 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 816 if (h == NULL) { | |
| 817 return NGX_ERROR; | |
| 818 } | |
| 819 | |
| 2294 | 820 *h = ngx_http_limit_req_handler; |
| 980 | 821 |
| 822 return NGX_OK; | |
| 823 } |