Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 4440:97995d63aa36 stable-1.0
Merge of r4381, r4400:
Fixed limit_conn_log_level/limit_req_log_level inheritance. The
directives did not work if there were no limit_conn/limit_req
specified on the same level.
The code for limit_conn is different in 1.0.x, conflict resolved
manually.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Sun, 05 Feb 2012 15:47:58 +0000 |
| parents | d94d7104f598 |
| children | 4919fb357a5d |
| 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_uint_t *ep); |
| 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, &excess); |
| 980 | 190 |
| 2313 | 191 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 2973 | 192 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000); |
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193 |
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194 if (rc == NGX_DECLINED) { |
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195 |
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196 n = offsetof(ngx_rbtree_node_t, color) |
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197 + offsetof(ngx_http_limit_req_node_t, data) |
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198 + len; |
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199 |
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200 node = ngx_slab_alloc_locked(ctx->shpool, n); |
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201 if (node == NULL) { |
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202 |
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203 ngx_http_limit_req_expire(ctx, 0); |
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204 |
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205 node = ngx_slab_alloc_locked(ctx->shpool, n); |
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206 if (node == NULL) { |
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207 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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208 return NGX_HTTP_SERVICE_UNAVAILABLE; |
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209 } |
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210 } |
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211 |
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212 lr = (ngx_http_limit_req_node_t *) &node->color; |
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213 |
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214 node->key = hash; |
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215 lr->len = (u_char) len; |
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216 |
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217 tp = ngx_timeofday(); |
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218 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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219 |
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220 lr->excess = 0; |
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221 ngx_memcpy(lr->data, vv->data, len); |
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222 |
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223 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
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224 |
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225 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
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226 |
| 2294 | 227 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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228 |
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229 return NGX_DECLINED; |
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230 } |
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231 |
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232 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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233 |
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234 if (rc == NGX_OK) { |
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235 return NGX_DECLINED; |
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236 } |
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237 |
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238 if (rc == NGX_BUSY) { |
| 3185 | 239 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, |
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240 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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241 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
| 980 | 242 |
| 243 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 244 } | |
| 245 | |
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246 /* rc == NGX_AGAIN */ |
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247 |
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248 if (lrcf->nodelay) { |
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249 return NGX_DECLINED; |
| 2294 | 250 } |
| 251 | |
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252 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, |
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253 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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254 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
| 2294 | 255 |
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256 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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257 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
| 2294 | 258 } |
| 259 | |
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260 r->read_event_handler = ngx_http_test_reading; |
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261 r->write_event_handler = ngx_http_limit_req_delay; |
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262 ngx_add_timer(r->connection->write, |
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263 (ngx_msec_t) excess * 1000 / ctx->rate); |
| 2294 | 264 |
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265 return NGX_AGAIN; |
| 980 | 266 } |
| 267 | |
| 268 | |
| 269 static void | |
| 2294 | 270 ngx_http_limit_req_delay(ngx_http_request_t *r) |
| 271 { | |
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272 ngx_event_t *wev; |
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273 |
| 2294 | 274 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 2973 | 275 "limit_req delay"); |
| 2294 | 276 |
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277 wev = r->connection->write; |
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278 |
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279 if (!wev->timedout) { |
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280 |
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281 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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282 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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283 } |
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284 |
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285 return; |
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286 } |
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287 |
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288 wev->timedout = 0; |
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289 |
| 2294 | 290 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
| 291 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| 292 return; | |
| 293 } | |
| 294 | |
| 295 r->read_event_handler = ngx_http_block_reading; | |
| 296 r->write_event_handler = ngx_http_core_run_phases; | |
| 297 | |
| 298 ngx_http_core_run_phases(r); | |
| 299 } | |
| 300 | |
| 301 | |
| 302 static void | |
| 303 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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304 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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305 { |
| 2294 | 306 ngx_rbtree_node_t **p; |
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307 ngx_http_limit_req_node_t *lrn, *lrnt; |
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308 |
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309 for ( ;; ) { |
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310 |
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311 if (node->key < temp->key) { |
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312 |
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313 p = &temp->left; |
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314 |
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315 } else if (node->key > temp->key) { |
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316 |
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317 p = &temp->right; |
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318 |
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319 } else { /* node->key == temp->key */ |
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320 |
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321 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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322 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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323 |
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324 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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325 ? &temp->left : &temp->right; |
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326 } |
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327 |
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328 if (*p == sentinel) { |
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329 break; |
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330 } |
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331 |
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332 temp = *p; |
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333 } |
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334 |
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335 *p = node; |
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336 node->parent = temp; |
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337 node->left = sentinel; |
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338 node->right = sentinel; |
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339 ngx_rbt_red(node); |
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340 } |
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341 |
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342 |
| 2294 | 343 static ngx_int_t |
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344 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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345 u_char *data, size_t len, ngx_uint_t *ep) |
| 980 | 346 { |
| 2313 | 347 ngx_int_t rc, excess; |
| 2294 | 348 ngx_time_t *tp; |
| 349 ngx_msec_t now; | |
| 350 ngx_msec_int_t ms; | |
| 351 ngx_rbtree_node_t *node, *sentinel; | |
| 352 ngx_http_limit_req_ctx_t *ctx; | |
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353 ngx_http_limit_req_node_t *lr; |
| 2294 | 354 |
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355 ctx = lrcf->shm_zone->data; |
| 2294 | 356 |
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357 node = ctx->sh->rbtree.root; |
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358 sentinel = ctx->sh->rbtree.sentinel; |
| 980 | 359 |
| 2294 | 360 while (node != sentinel) { |
| 361 | |
| 362 if (hash < node->key) { | |
| 363 node = node->left; | |
| 364 continue; | |
| 365 } | |
| 366 | |
| 367 if (hash > node->key) { | |
| 368 node = node->right; | |
| 369 continue; | |
| 370 } | |
| 371 | |
| 372 /* hash == node->key */ | |
| 373 | |
| 374 do { | |
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375 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 376 |
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377 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
| 2294 | 378 |
| 379 if (rc == 0) { | |
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380 ngx_queue_remove(&lr->queue); |
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381 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
| 2294 | 382 |
| 383 tp = ngx_timeofday(); | |
| 980 | 384 |
| 2294 | 385 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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386 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 387 |
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388 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
| 2294 | 389 |
| 3191 | 390 if (excess < 0) { |
| 391 excess = 0; | |
| 392 } | |
| 393 | |
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394 *ep = excess; |
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395 |
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396 if ((ngx_uint_t) excess > lrcf->burst) { |
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397 return NGX_BUSY; |
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398 } |
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399 |
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400 lr->excess = excess; |
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401 lr->last = now; |
| 980 | 402 |
| 2313 | 403 if (excess) { |
| 2294 | 404 return NGX_AGAIN; |
| 405 } | |
| 980 | 406 |
| 2294 | 407 return NGX_OK; |
| 408 } | |
| 409 | |
| 410 node = (rc < 0) ? node->left : node->right; | |
| 411 | |
| 412 } while (node != sentinel && hash == node->key); | |
| 413 | |
| 414 break; | |
| 980 | 415 } |
| 416 | |
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417 *ep = 0; |
| 2294 | 418 |
| 419 return NGX_DECLINED; | |
| 420 } | |
| 421 | |
| 422 | |
| 423 static void | |
| 424 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
| 425 { | |
| 2313 | 426 ngx_int_t excess; |
| 2294 | 427 ngx_time_t *tp; |
| 428 ngx_msec_t now; | |
| 429 ngx_queue_t *q; | |
| 430 ngx_msec_int_t ms; | |
| 431 ngx_rbtree_node_t *node; | |
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432 ngx_http_limit_req_node_t *lr; |
| 2294 | 433 |
| 434 tp = ngx_timeofday(); | |
| 435 | |
| 436 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
| 437 | |
| 438 /* | |
| 439 * n == 1 deletes one or two zero rate entries | |
| 440 * n == 0 deletes oldest entry by force | |
| 441 * and one or two zero rate entries | |
| 442 */ | |
| 443 | |
| 444 while (n < 3) { | |
| 445 | |
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446 if (ngx_queue_empty(&ctx->sh->queue)) { |
| 2294 | 447 return; |
| 448 } | |
| 449 | |
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450 q = ngx_queue_last(&ctx->sh->queue); |
| 2294 | 451 |
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452 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
| 2294 | 453 |
| 454 if (n++ != 0) { | |
| 455 | |
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456 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 457 ms = ngx_abs(ms); |
| 458 | |
| 459 if (ms < 60000) { | |
| 460 return; | |
| 461 } | |
| 462 | |
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463 excess = lr->excess - ctx->rate * ms / 1000; |
| 2294 | 464 |
| 2313 | 465 if (excess > 0) { |
| 2294 | 466 return; |
| 467 } | |
| 468 } | |
| 469 | |
| 470 ngx_queue_remove(q); | |
| 471 | |
| 472 node = (ngx_rbtree_node_t *) | |
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473 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
| 2294 | 474 |
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475 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
| 2294 | 476 |
| 477 ngx_slab_free_locked(ctx->shpool, node); | |
| 478 } | |
| 980 | 479 } |
| 480 | |
| 481 | |
| 482 static ngx_int_t | |
| 2294 | 483 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 484 { |
| 2294 | 485 ngx_http_limit_req_ctx_t *octx = data; |
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486 |
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487 size_t len; |
| 2294 | 488 ngx_http_limit_req_ctx_t *ctx; |
| 980 | 489 |
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490 ctx = shm_zone->data; |
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491 |
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492 if (octx) { |
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493 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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494 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 2294 | 495 "limit_req \"%V\" uses the \"%V\" variable " |
|
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496 "while previously it used the \"%V\" variable", |
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497 &shm_zone->shm.name, &ctx->var, &octx->var); |
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498 return NGX_ERROR; |
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499 } |
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500 |
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501 ctx->sh = octx->sh; |
| 2294 | 502 ctx->shpool = octx->shpool; |
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503 |
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504 return NGX_OK; |
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505 } |
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506 |
| 2294 | 507 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 980 | 508 |
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509 if (shm_zone->shm.exists) { |
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510 ctx->sh = ctx->shpool->data; |
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511 |
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512 return NGX_OK; |
| 980 | 513 } |
| 514 | |
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515 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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516 if (ctx->sh == NULL) { |
| 980 | 517 return NGX_ERROR; |
| 518 } | |
| 519 | |
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520 ctx->shpool->data = ctx->sh; |
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521 |
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522 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
| 2294 | 523 ngx_http_limit_req_rbtree_insert_value); |
| 524 | |
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525 ngx_queue_init(&ctx->sh->queue); |
| 980 | 526 |
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527 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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528 |
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529 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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530 if (ctx->shpool->log_ctx == NULL) { |
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531 return NGX_ERROR; |
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532 } |
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533 |
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534 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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535 &shm_zone->shm.name); |
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536 |
| 980 | 537 return NGX_OK; |
| 538 } | |
| 539 | |
| 540 | |
| 541 static void * | |
| 2294 | 542 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
| 980 | 543 { |
| 2294 | 544 ngx_http_limit_req_conf_t *conf; |
| 980 | 545 |
| 2294 | 546 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
| 980 | 547 if (conf == NULL) { |
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548 return NULL; |
| 980 | 549 } |
| 550 | |
| 551 /* | |
| 552 * set by ngx_pcalloc(): | |
| 553 * | |
| 554 * conf->shm_zone = NULL; | |
| 2375 | 555 * conf->burst = 0; |
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556 * conf->nodelay = 0; |
| 980 | 557 */ |
| 558 | |
| 3185 | 559 conf->limit_log_level = NGX_CONF_UNSET_UINT; |
| 560 | |
| 980 | 561 return conf; |
| 562 } | |
| 563 | |
| 564 | |
| 565 static char * | |
| 2294 | 566 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
| 980 | 567 { |
| 2294 | 568 ngx_http_limit_req_conf_t *prev = parent; |
| 569 ngx_http_limit_req_conf_t *conf = child; | |
| 980 | 570 |
| 571 if (conf->shm_zone == NULL) { | |
| 4440 | 572 conf->shm_zone = prev->shm_zone; |
| 573 conf->burst = prev->burst; | |
| 574 conf->nodelay = prev->nodelay; | |
| 980 | 575 } |
| 576 | |
| 3185 | 577 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, |
| 578 NGX_LOG_ERR); | |
| 579 | |
| 580 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ? | |
| 581 NGX_LOG_INFO : conf->limit_log_level + 1; | |
| 582 | |
| 980 | 583 return NGX_CONF_OK; |
| 584 } | |
| 585 | |
| 586 | |
| 587 static char * | |
| 2294 | 588 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 589 { |
| 2294 | 590 u_char *p; |
| 591 size_t size, len; | |
| 592 ngx_str_t *value, name, s; | |
| 593 ngx_int_t rate, scale; | |
| 594 ngx_uint_t i; | |
| 595 ngx_shm_zone_t *shm_zone; | |
| 596 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 597 |
| 598 value = cf->args->elts; | |
| 599 | |
| 2294 | 600 ctx = NULL; |
| 601 size = 0; | |
| 602 rate = 1; | |
| 603 scale = 1; | |
| 604 name.len = 0; | |
| 605 | |
| 606 for (i = 1; i < cf->args->nelts; i++) { | |
| 607 | |
| 608 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 609 | |
| 610 name.data = value[i].data + 5; | |
| 611 | |
| 612 p = (u_char *) ngx_strchr(name.data, ':'); | |
| 613 | |
| 614 if (p) { | |
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615 *p = '\0'; |
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616 |
| 2294 | 617 name.len = p - name.data; |
| 618 | |
| 619 p++; | |
| 620 | |
| 621 s.len = value[i].data + value[i].len - p; | |
| 622 s.data = p; | |
| 623 | |
| 624 size = ngx_parse_size(&s); | |
| 625 if (size > 8191) { | |
| 626 continue; | |
| 627 } | |
| 628 } | |
| 629 | |
| 630 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 631 "invalid zone size \"%V\"", &value[i]); | |
| 632 return NGX_CONF_ERROR; | |
| 633 } | |
| 634 | |
| 635 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
| 636 | |
| 637 len = value[i].len; | |
| 638 p = value[i].data + len - 3; | |
| 987 | 639 |
| 2294 | 640 if (ngx_strncmp(p, "r/s", 3) == 0) { |
| 641 scale = 1; | |
| 642 len -= 3; | |
| 643 | |
| 644 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
| 645 scale = 60; | |
| 646 len -= 3; | |
| 647 } | |
| 648 | |
| 649 rate = ngx_atoi(value[i].data + 5, len - 5); | |
| 650 if (rate <= NGX_ERROR) { | |
| 651 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 652 "invalid rate \"%V\"", &value[i]); | |
| 653 return NGX_CONF_ERROR; | |
| 654 } | |
| 655 | |
| 656 continue; | |
| 657 } | |
| 658 | |
| 659 if (value[i].data[0] == '$') { | |
| 987 | 660 |
| 2294 | 661 value[i].len--; |
| 662 value[i].data++; | |
| 663 | |
| 664 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
| 665 if (ctx == NULL) { | |
| 666 return NGX_CONF_ERROR; | |
| 667 } | |
| 668 | |
| 669 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
| 670 if (ctx->index == NGX_ERROR) { | |
| 671 return NGX_CONF_ERROR; | |
| 672 } | |
| 673 | |
| 674 ctx->var = value[i]; | |
| 675 | |
| 676 continue; | |
| 677 } | |
| 678 | |
| 679 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 680 "invalid parameter \"%V\"", &value[i]); | |
| 987 | 681 return NGX_CONF_ERROR; |
| 682 } | |
| 683 | |
| 2294 | 684 if (name.len == 0 || size == 0) { |
| 685 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 686 "\"%V\" must have \"zone\" parameter", | |
| 687 &cmd->name); | |
| 987 | 688 return NGX_CONF_ERROR; |
| 689 } | |
| 690 | |
| 2294 | 691 if (ctx == NULL) { |
| 980 | 692 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 693 "no variable is defined for limit_req_zone \"%V\"", |
| 694 &cmd->name); | |
| 980 | 695 return NGX_CONF_ERROR; |
| 696 } | |
| 697 | |
| 2313 | 698 ctx->rate = rate * 1000 / scale; |
| 980 | 699 |
| 2294 | 700 shm_zone = ngx_shared_memory_add(cf, &name, size, |
| 701 &ngx_http_limit_req_module); | |
| 980 | 702 if (shm_zone == NULL) { |
| 703 return NGX_CONF_ERROR; | |
| 704 } | |
| 705 | |
| 987 | 706 if (shm_zone->data) { |
| 707 ctx = shm_zone->data; | |
| 708 | |
| 709 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 2294 | 710 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
| 711 &value[1], &ctx->var); | |
| 987 | 712 return NGX_CONF_ERROR; |
| 713 } | |
| 714 | |
| 2294 | 715 shm_zone->init = ngx_http_limit_req_init_zone; |
| 987 | 716 shm_zone->data = ctx; |
| 980 | 717 |
| 718 return NGX_CONF_OK; | |
| 719 } | |
| 720 | |
| 721 | |
| 722 static char * | |
| 2294 | 723 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 724 { |
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725 ngx_http_limit_req_conf_t *lrcf = conf; |
| 980 | 726 |
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727 ngx_int_t burst; |
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728 ngx_str_t *value, s; |
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729 ngx_uint_t i; |
| 2294 | 730 |
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731 if (lrcf->shm_zone) { |
| 2294 | 732 return "is duplicate"; |
| 733 } | |
| 980 | 734 |
| 735 value = cf->args->elts; | |
| 736 | |
| 2294 | 737 burst = 0; |
| 738 | |
| 739 for (i = 1; i < cf->args->nelts; i++) { | |
| 740 | |
| 741 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 742 | |
| 743 s.len = value[i].len - 5; | |
| 744 s.data = value[i].data + 5; | |
| 745 | |
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746 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
| 2294 | 747 &ngx_http_limit_req_module); |
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748 if (lrcf->shm_zone == NULL) { |
| 2294 | 749 return NGX_CONF_ERROR; |
| 750 } | |
| 751 | |
| 752 continue; | |
| 753 } | |
| 754 | |
| 755 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
| 756 | |
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757 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
| 2294 | 758 if (burst <= 0) { |
| 759 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 760 "invalid burst rate \"%V\"", &value[i]); | |
| 761 return NGX_CONF_ERROR; | |
| 762 } | |
| 763 | |
| 764 continue; | |
| 765 } | |
| 766 | |
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767 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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768 lrcf->nodelay = 1; |
| 2294 | 769 continue; |
| 770 } | |
| 771 | |
| 772 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 773 "invalid parameter \"%V\"", &value[i]); | |
| 980 | 774 return NGX_CONF_ERROR; |
| 775 } | |
| 776 | |
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777 if (lrcf->shm_zone == NULL) { |
| 980 | 778 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 779 "\"%V\" must have \"zone\" parameter", |
| 780 &cmd->name); | |
| 980 | 781 return NGX_CONF_ERROR; |
| 782 } | |
| 783 | |
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784 if (lrcf->shm_zone->data == NULL) { |
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785 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 786 "unknown limit_req_zone \"%V\"", |
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787 &lrcf->shm_zone->shm.name); |
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788 return NGX_CONF_ERROR; |
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789 } |
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790 |
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791 lrcf->burst = burst * 1000; |
| 980 | 792 |
| 793 return NGX_CONF_OK; | |
| 794 } | |
| 795 | |
| 796 | |
| 797 static ngx_int_t | |
| 2294 | 798 ngx_http_limit_req_init(ngx_conf_t *cf) |
| 980 | 799 { |
| 800 ngx_http_handler_pt *h; | |
| 801 ngx_http_core_main_conf_t *cmcf; | |
| 802 | |
| 803 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 804 | |
| 805 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 806 if (h == NULL) { | |
| 807 return NGX_ERROR; | |
| 808 } | |
| 809 | |
| 2294 | 810 *h = ngx_http_limit_req_handler; |
| 980 | 811 |
| 812 return NGX_OK; | |
| 813 } |