Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 2375:95004b25476c
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| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Mon, 08 Dec 2008 14:15:19 +0000 |
| parents | 7b11f9a1bfe1 |
| children | 29d89920a749 |
| 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 { | |
| 981 | 13 u_char color; |
| 2294 | 14 u_char dummy; |
| 15 u_short len; | |
| 16 ngx_queue_t queue; | |
| 17 ngx_msec_t last; | |
| 2313 | 18 ngx_uint_t excess; /* integer value, 1 corresponds to 0.001 r/s */ |
| 980 | 19 u_char data[1]; |
| 2294 | 20 } ngx_http_limit_req_node_t; |
| 980 | 21 |
| 22 | |
| 23 typedef struct { | |
| 987 | 24 ngx_rbtree_t *rbtree; |
| 2294 | 25 ngx_queue_t *queue; |
| 26 ngx_slab_pool_t *shpool; | |
| 2313 | 27 ngx_uint_t rate; /* integer value, 1 corresponds to 0.001 r/s */ |
| 987 | 28 ngx_int_t index; |
| 29 ngx_str_t var; | |
| 2294 | 30 } ngx_http_limit_req_ctx_t; |
| 987 | 31 |
| 32 | |
| 33 typedef struct { | |
| 980 | 34 ngx_shm_zone_t *shm_zone; |
| 2313 | 35 ngx_uint_t burst; /* integer value, 1 corresponds to 0.001 r/s */ |
| 36 ngx_uint_t nodelay;/* unsigned nodelay:1 */ | |
| 2294 | 37 } ngx_http_limit_req_conf_t; |
| 980 | 38 |
| 39 | |
| 2294 | 40 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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41 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, |
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42 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lrp); |
| 2294 | 43 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
| 44 ngx_uint_t n); | |
| 980 | 45 |
| 2294 | 46 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
| 47 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
| 980 | 48 void *child); |
| 2294 | 49 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 50 void *conf); |
| 2294 | 51 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 52 void *conf); |
| 2294 | 53 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
| 980 | 54 |
| 55 | |
| 2294 | 56 static ngx_command_t ngx_http_limit_req_commands[] = { |
| 980 | 57 |
| 2294 | 58 { ngx_string("limit_req_zone"), |
| 987 | 59 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
| 2294 | 60 ngx_http_limit_req_zone, |
| 980 | 61 0, |
| 62 0, | |
| 63 NULL }, | |
| 64 | |
| 2294 | 65 { ngx_string("limit_req"), |
| 66 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
| 67 ngx_http_limit_req, | |
| 980 | 68 NGX_HTTP_LOC_CONF_OFFSET, |
| 69 0, | |
| 70 NULL }, | |
| 71 | |
| 72 ngx_null_command | |
| 73 }; | |
| 74 | |
| 75 | |
| 2294 | 76 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
| 980 | 77 NULL, /* preconfiguration */ |
| 2294 | 78 ngx_http_limit_req_init, /* postconfiguration */ |
| 980 | 79 |
| 80 NULL, /* create main configuration */ | |
| 81 NULL, /* init main configuration */ | |
| 82 | |
| 83 NULL, /* create server configuration */ | |
| 84 NULL, /* merge server configuration */ | |
| 85 | |
| 2294 | 86 ngx_http_limit_req_create_conf, /* create location configration */ |
| 87 ngx_http_limit_req_merge_conf /* merge location configration */ | |
| 980 | 88 }; |
| 89 | |
| 90 | |
| 2294 | 91 ngx_module_t ngx_http_limit_req_module = { |
| 980 | 92 NGX_MODULE_V1, |
| 2294 | 93 &ngx_http_limit_req_module_ctx, /* module context */ |
| 94 ngx_http_limit_req_commands, /* module directives */ | |
| 980 | 95 NGX_HTTP_MODULE, /* module type */ |
| 96 NULL, /* init master */ | |
| 97 NULL, /* init module */ | |
| 98 NULL, /* init process */ | |
| 99 NULL, /* init thread */ | |
| 100 NULL, /* exit thread */ | |
| 101 NULL, /* exit process */ | |
| 102 NULL, /* exit master */ | |
| 103 NGX_MODULE_V1_PADDING | |
| 104 }; | |
| 105 | |
| 106 | |
| 107 static ngx_int_t | |
| 2294 | 108 ngx_http_limit_req_handler(ngx_http_request_t *r) |
| 980 | 109 { |
| 2294 | 110 size_t len, n; |
| 111 uint32_t hash; | |
| 112 ngx_int_t rc; | |
| 2313 | 113 ngx_uint_t excess; |
| 2294 | 114 ngx_time_t *tp; |
| 115 ngx_rbtree_node_t *node; | |
| 116 ngx_http_variable_value_t *vv; | |
| 117 ngx_http_limit_req_ctx_t *ctx; | |
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118 ngx_http_limit_req_node_t *lr; |
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119 ngx_http_limit_req_conf_t *lrcf; |
| 980 | 120 |
| 2294 | 121 if (r->main->limit_req_set) { |
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122 return NGX_DECLINED; |
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123 } |
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124 |
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125 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
| 980 | 126 |
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127 if (lrcf->shm_zone == NULL) { |
| 980 | 128 return NGX_DECLINED; |
| 129 } | |
| 130 | |
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131 ctx = lrcf->shm_zone->data; |
| 987 | 132 |
| 133 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
| 980 | 134 |
| 135 if (vv == NULL || vv->not_found) { | |
| 136 return NGX_DECLINED; | |
| 137 } | |
| 138 | |
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139 len = vv->len; |
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140 |
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141 if (len == 0) { |
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142 return NGX_DECLINED; |
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143 } |
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144 |
| 2294 | 145 if (len > 65535) { |
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146 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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147 "the value of the \"%V\" variable " |
| 2294 | 148 "is more than 65535 bytes: \"%v\"", |
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149 &ctx->var, vv); |
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150 return NGX_DECLINED; |
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151 } |
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152 |
| 2294 | 153 r->main->limit_req_set = 1; |
| 980 | 154 |
| 155 hash = ngx_crc32_short(vv->data, len); | |
| 156 | |
| 2294 | 157 ngx_shmtx_lock(&ctx->shpool->mutex); |
| 158 | |
| 159 ngx_http_limit_req_expire(ctx, 1); | |
| 160 | |
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161 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr); |
| 2294 | 162 |
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163 if (lr) { |
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164 ngx_queue_remove(&lr->queue); |
| 2294 | 165 |
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166 ngx_queue_insert_head(ctx->queue, &lr->queue); |
| 2294 | 167 |
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168 excess = lr->excess; |
| 2294 | 169 |
| 170 } else { | |
| 2313 | 171 excess = 0; |
| 980 | 172 } |
| 173 | |
| 2313 | 174 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 175 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000); | |
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176 |
| 2294 | 177 if (rc == NGX_BUSY) { |
| 178 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
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179 |
| 2294 | 180 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
| 2313 | 181 "limiting requests, excess: %ui.%03ui", |
| 182 excess / 1000, excess % 1000); | |
| 980 | 183 |
| 184 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 185 } | |
| 186 | |
| 2294 | 187 if (rc == NGX_AGAIN) { |
| 188 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 189 | |
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190 if (lrcf->nodelay) { |
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191 return NGX_DECLINED; |
| 2294 | 192 } |
| 193 | |
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194 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0, |
| 2313 | 195 "delaying request, excess: %ui.%03ui", |
| 196 excess / 1000, excess % 1000); | |
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197 |
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198 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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199 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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200 } |
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201 |
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202 r->read_event_handler = ngx_http_test_reading; |
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203 r->write_event_handler = ngx_http_limit_req_delay; |
| 2313 | 204 ngx_add_timer(r->connection->write, (ngx_msec_t) excess); |
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205 |
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206 return NGX_AGAIN; |
| 2294 | 207 } |
| 208 | |
| 209 if (rc == NGX_OK) { | |
| 210 goto done; | |
| 211 } | |
| 212 | |
| 213 /* rc == NGX_DECLINED */ | |
| 214 | |
| 215 n = offsetof(ngx_rbtree_node_t, color) | |
| 216 + offsetof(ngx_http_limit_req_node_t, data) | |
| 217 + len; | |
| 218 | |
| 219 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 220 if (node == NULL) { | |
| 221 | |
| 222 ngx_http_limit_req_expire(ctx, 0); | |
| 223 | |
| 224 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 225 if (node == NULL) { | |
| 226 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 227 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 228 } | |
| 229 } | |
| 230 | |
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231 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 232 |
| 233 node->key = hash; | |
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234 lr->len = (u_char) len; |
| 2294 | 235 |
| 236 tp = ngx_timeofday(); | |
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237 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
| 2294 | 238 |
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239 lr->excess = 0; |
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240 ngx_memcpy(lr->data, vv->data, len); |
| 980 | 241 |
| 987 | 242 ngx_rbtree_insert(ctx->rbtree, node); |
| 980 | 243 |
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244 ngx_queue_insert_head(ctx->queue, &lr->queue); |
| 2294 | 245 |
| 980 | 246 done: |
| 247 | |
| 2294 | 248 ngx_shmtx_unlock(&ctx->shpool->mutex); |
| 980 | 249 |
| 250 return NGX_DECLINED; | |
| 251 } | |
| 252 | |
| 253 | |
| 254 static void | |
| 2294 | 255 ngx_http_limit_req_delay(ngx_http_request_t *r) |
| 256 { | |
| 257 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 258 "limit_req delay"); | |
| 259 | |
| 260 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { | |
| 261 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| 262 return; | |
| 263 } | |
| 264 | |
| 265 r->read_event_handler = ngx_http_block_reading; | |
| 266 r->write_event_handler = ngx_http_core_run_phases; | |
| 267 | |
| 268 ngx_http_core_run_phases(r); | |
| 269 } | |
| 270 | |
| 271 | |
| 272 static void | |
| 273 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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274 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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275 { |
| 2294 | 276 ngx_rbtree_node_t **p; |
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277 ngx_http_limit_req_node_t *lrn, *lrnt; |
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278 |
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279 for ( ;; ) { |
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280 |
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281 if (node->key < temp->key) { |
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282 |
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283 p = &temp->left; |
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284 |
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285 } else if (node->key > temp->key) { |
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286 |
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287 p = &temp->right; |
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288 |
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289 } else { /* node->key == temp->key */ |
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290 |
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291 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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292 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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293 |
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294 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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295 ? &temp->left : &temp->right; |
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296 } |
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297 |
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298 if (*p == sentinel) { |
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299 break; |
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300 } |
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301 |
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302 temp = *p; |
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303 } |
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304 |
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305 *p = node; |
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306 node->parent = temp; |
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307 node->left = sentinel; |
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308 node->right = sentinel; |
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309 ngx_rbt_red(node); |
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310 } |
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311 |
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312 |
| 2294 | 313 static ngx_int_t |
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314 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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315 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp) |
| 980 | 316 { |
| 2313 | 317 ngx_int_t rc, excess; |
| 2294 | 318 ngx_time_t *tp; |
| 319 ngx_msec_t now; | |
| 320 ngx_msec_int_t ms; | |
| 321 ngx_rbtree_node_t *node, *sentinel; | |
| 322 ngx_http_limit_req_ctx_t *ctx; | |
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323 ngx_http_limit_req_node_t *lr; |
| 2294 | 324 |
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325 ctx = lrcf->shm_zone->data; |
| 2294 | 326 |
| 327 node = ctx->rbtree->root; | |
| 328 sentinel = ctx->rbtree->sentinel; | |
| 980 | 329 |
| 2294 | 330 while (node != sentinel) { |
| 331 | |
| 332 if (hash < node->key) { | |
| 333 node = node->left; | |
| 334 continue; | |
| 335 } | |
| 336 | |
| 337 if (hash > node->key) { | |
| 338 node = node->right; | |
| 339 continue; | |
| 340 } | |
| 341 | |
| 342 /* hash == node->key */ | |
| 343 | |
| 344 do { | |
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345 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 346 |
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347 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
| 2294 | 348 |
| 349 if (rc == 0) { | |
| 350 | |
| 351 tp = ngx_timeofday(); | |
| 980 | 352 |
| 2294 | 353 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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354 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 355 |
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356 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
| 2294 | 357 |
| 2313 | 358 if (excess < 0) { |
| 359 excess = 0; | |
| 2294 | 360 } |
| 361 | |
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362 lr->excess = excess; |
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363 lr->last = now; |
| 980 | 364 |
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365 *lrp = lr; |
| 2294 | 366 |
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367 if ((ngx_uint_t) excess > lrcf->burst) { |
| 2294 | 368 return NGX_BUSY; |
| 369 } | |
| 980 | 370 |
| 2313 | 371 if (excess) { |
| 2294 | 372 return NGX_AGAIN; |
| 373 } | |
| 980 | 374 |
| 2294 | 375 return NGX_OK; |
| 376 } | |
| 377 | |
| 378 node = (rc < 0) ? node->left : node->right; | |
| 379 | |
| 380 } while (node != sentinel && hash == node->key); | |
| 381 | |
| 382 break; | |
| 980 | 383 } |
| 384 | |
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385 *lrp = NULL; |
| 2294 | 386 |
| 387 return NGX_DECLINED; | |
| 388 } | |
| 389 | |
| 390 | |
| 391 static void | |
| 392 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
| 393 { | |
| 2313 | 394 ngx_int_t excess; |
| 2294 | 395 ngx_time_t *tp; |
| 396 ngx_msec_t now; | |
| 397 ngx_queue_t *q; | |
| 398 ngx_msec_int_t ms; | |
| 399 ngx_rbtree_node_t *node; | |
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400 ngx_http_limit_req_node_t *lr; |
| 2294 | 401 |
| 402 tp = ngx_timeofday(); | |
| 403 | |
| 404 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
| 405 | |
| 406 /* | |
| 407 * n == 1 deletes one or two zero rate entries | |
| 408 * n == 0 deletes oldest entry by force | |
| 409 * and one or two zero rate entries | |
| 410 */ | |
| 411 | |
| 412 while (n < 3) { | |
| 413 | |
| 414 if (ngx_queue_empty(ctx->queue)) { | |
| 415 return; | |
| 416 } | |
| 417 | |
| 418 q = ngx_queue_last(ctx->queue); | |
| 419 | |
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420 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
| 2294 | 421 |
| 422 if (n++ != 0) { | |
| 423 | |
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424 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 425 ms = ngx_abs(ms); |
| 426 | |
| 427 if (ms < 60000) { | |
| 428 return; | |
| 429 } | |
| 430 | |
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431 excess = lr->excess - ctx->rate * ms / 1000; |
| 2294 | 432 |
| 2313 | 433 if (excess > 0) { |
| 2294 | 434 return; |
| 435 } | |
| 436 } | |
| 437 | |
| 438 ngx_queue_remove(q); | |
| 439 | |
| 440 node = (ngx_rbtree_node_t *) | |
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441 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
| 2294 | 442 |
| 443 ngx_rbtree_delete(ctx->rbtree, node); | |
| 444 | |
| 445 ngx_slab_free_locked(ctx->shpool, node); | |
| 446 } | |
| 980 | 447 } |
| 448 | |
| 449 | |
| 450 static ngx_int_t | |
| 2294 | 451 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 452 { |
| 2294 | 453 ngx_http_limit_req_ctx_t *octx = data; |
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454 |
| 2294 | 455 ngx_rbtree_node_t *sentinel; |
| 456 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 457 |
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458 ctx = shm_zone->data; |
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459 |
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460 if (octx) { |
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461 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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462 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 2294 | 463 "limit_req \"%V\" uses the \"%V\" variable " |
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464 "while previously it used the \"%V\" variable", |
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465 &shm_zone->name, &ctx->var, &octx->var); |
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466 return NGX_ERROR; |
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467 } |
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468 |
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469 ctx->rbtree = octx->rbtree; |
| 2294 | 470 ctx->queue = octx->queue; |
| 471 ctx->shpool = octx->shpool; | |
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472 |
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473 return NGX_OK; |
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474 } |
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475 |
| 2294 | 476 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 980 | 477 |
| 2294 | 478 ctx->rbtree = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_t)); |
| 987 | 479 if (ctx->rbtree == NULL) { |
| 980 | 480 return NGX_ERROR; |
| 481 } | |
| 482 | |
| 2294 | 483 sentinel = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_node_t)); |
| 980 | 484 if (sentinel == NULL) { |
| 485 return NGX_ERROR; | |
| 486 } | |
| 487 | |
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488 ngx_rbtree_init(ctx->rbtree, sentinel, |
| 2294 | 489 ngx_http_limit_req_rbtree_insert_value); |
| 490 | |
| 491 ctx->queue = ngx_slab_alloc(ctx->shpool, sizeof(ngx_queue_t)); | |
| 492 if (ctx->queue == NULL) { | |
| 493 return NGX_ERROR; | |
| 494 } | |
| 495 | |
| 496 ngx_queue_init(ctx->queue); | |
| 980 | 497 |
| 498 return NGX_OK; | |
| 499 } | |
| 500 | |
| 501 | |
| 502 static void * | |
| 2294 | 503 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
| 980 | 504 { |
| 2294 | 505 ngx_http_limit_req_conf_t *conf; |
| 980 | 506 |
| 2294 | 507 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
| 980 | 508 if (conf == NULL) { |
| 509 return NGX_CONF_ERROR; | |
| 510 } | |
| 511 | |
| 512 /* | |
| 513 * set by ngx_pcalloc(): | |
| 514 * | |
| 515 * conf->shm_zone = NULL; | |
| 2375 | 516 * conf->burst = 0; |
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517 * conf->nodelay = 0; |
| 980 | 518 */ |
| 519 | |
| 520 return conf; | |
| 521 } | |
| 522 | |
| 523 | |
| 524 static char * | |
| 2294 | 525 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
| 980 | 526 { |
| 2294 | 527 ngx_http_limit_req_conf_t *prev = parent; |
| 528 ngx_http_limit_req_conf_t *conf = child; | |
| 980 | 529 |
| 530 if (conf->shm_zone == NULL) { | |
| 531 *conf = *prev; | |
| 532 } | |
| 533 | |
| 534 return NGX_CONF_OK; | |
| 535 } | |
| 536 | |
| 537 | |
| 538 static char * | |
| 2294 | 539 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 540 { |
| 2294 | 541 u_char *p; |
| 542 size_t size, len; | |
| 543 ngx_str_t *value, name, s; | |
| 544 ngx_int_t rate, scale; | |
| 545 ngx_uint_t i; | |
| 546 ngx_shm_zone_t *shm_zone; | |
| 547 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 548 |
| 549 value = cf->args->elts; | |
| 550 | |
| 2294 | 551 ctx = NULL; |
| 552 size = 0; | |
| 553 rate = 1; | |
| 554 scale = 1; | |
| 555 name.len = 0; | |
| 556 | |
| 557 for (i = 1; i < cf->args->nelts; i++) { | |
| 558 | |
| 559 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 560 | |
| 561 name.data = value[i].data + 5; | |
| 562 | |
| 563 p = (u_char *) ngx_strchr(name.data, ':'); | |
| 564 | |
| 565 if (p) { | |
| 566 name.len = p - name.data; | |
| 567 | |
| 568 p++; | |
| 569 | |
| 570 s.len = value[i].data + value[i].len - p; | |
| 571 s.data = p; | |
| 572 | |
| 573 size = ngx_parse_size(&s); | |
| 574 if (size > 8191) { | |
| 575 continue; | |
| 576 } | |
| 577 } | |
| 578 | |
| 579 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 580 "invalid zone size \"%V\"", &value[i]); | |
| 581 return NGX_CONF_ERROR; | |
| 582 } | |
| 583 | |
| 584 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
| 585 | |
| 586 len = value[i].len; | |
| 587 p = value[i].data + len - 3; | |
| 987 | 588 |
| 2294 | 589 if (ngx_strncmp(p, "r/s", 3) == 0) { |
| 590 scale = 1; | |
| 591 len -= 3; | |
| 592 | |
| 593 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
| 594 scale = 60; | |
| 595 len -= 3; | |
| 596 } | |
| 597 | |
| 598 rate = ngx_atoi(value[i].data + 5, len - 5); | |
| 599 if (rate <= NGX_ERROR) { | |
| 600 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 601 "invalid rate \"%V\"", &value[i]); | |
| 602 return NGX_CONF_ERROR; | |
| 603 } | |
| 604 | |
| 605 continue; | |
| 606 } | |
| 607 | |
| 608 if (value[i].data[0] == '$') { | |
| 987 | 609 |
| 2294 | 610 value[i].len--; |
| 611 value[i].data++; | |
| 612 | |
| 613 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
| 614 if (ctx == NULL) { | |
| 615 return NGX_CONF_ERROR; | |
| 616 } | |
| 617 | |
| 618 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
| 619 if (ctx->index == NGX_ERROR) { | |
| 620 return NGX_CONF_ERROR; | |
| 621 } | |
| 622 | |
| 623 ctx->var = value[i]; | |
| 624 | |
| 625 continue; | |
| 626 } | |
| 627 | |
| 628 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 629 "invalid parameter \"%V\"", &value[i]); | |
| 987 | 630 return NGX_CONF_ERROR; |
| 631 } | |
| 632 | |
| 2294 | 633 if (name.len == 0 || size == 0) { |
| 634 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 635 "\"%V\" must have \"zone\" parameter", | |
| 636 &cmd->name); | |
| 987 | 637 return NGX_CONF_ERROR; |
| 638 } | |
| 639 | |
| 2294 | 640 if (ctx == NULL) { |
| 980 | 641 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 642 "no variable is defined for limit_req_zone \"%V\"", |
| 643 &cmd->name); | |
| 980 | 644 return NGX_CONF_ERROR; |
| 645 } | |
| 646 | |
| 2313 | 647 ctx->rate = rate * 1000 / scale; |
| 980 | 648 |
| 2294 | 649 shm_zone = ngx_shared_memory_add(cf, &name, size, |
| 650 &ngx_http_limit_req_module); | |
| 980 | 651 if (shm_zone == NULL) { |
| 652 return NGX_CONF_ERROR; | |
| 653 } | |
| 654 | |
| 987 | 655 if (shm_zone->data) { |
| 656 ctx = shm_zone->data; | |
| 657 | |
| 658 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 2294 | 659 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
| 660 &value[1], &ctx->var); | |
| 987 | 661 return NGX_CONF_ERROR; |
| 662 } | |
| 663 | |
| 2294 | 664 shm_zone->init = ngx_http_limit_req_init_zone; |
| 987 | 665 shm_zone->data = ctx; |
| 980 | 666 |
| 667 return NGX_CONF_OK; | |
| 668 } | |
| 669 | |
| 670 | |
| 671 static char * | |
| 2294 | 672 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 673 { |
|
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674 ngx_http_limit_req_conf_t *lrcf = conf; |
| 980 | 675 |
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676 ngx_int_t burst; |
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677 ngx_str_t *value, s; |
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678 ngx_uint_t i; |
| 2294 | 679 |
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680 if (lrcf->shm_zone) { |
| 2294 | 681 return "is duplicate"; |
| 682 } | |
| 980 | 683 |
| 684 value = cf->args->elts; | |
| 685 | |
| 2294 | 686 burst = 0; |
| 687 | |
| 688 for (i = 1; i < cf->args->nelts; i++) { | |
| 689 | |
| 690 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 691 | |
| 692 s.len = value[i].len - 5; | |
| 693 s.data = value[i].data + 5; | |
| 694 | |
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695 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
| 2294 | 696 &ngx_http_limit_req_module); |
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697 if (lrcf->shm_zone == NULL) { |
| 2294 | 698 return NGX_CONF_ERROR; |
| 699 } | |
| 700 | |
| 701 continue; | |
| 702 } | |
| 703 | |
| 704 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
| 705 | |
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706 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
| 2294 | 707 if (burst <= 0) { |
| 708 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 709 "invalid burst rate \"%V\"", &value[i]); | |
| 710 return NGX_CONF_ERROR; | |
| 711 } | |
| 712 | |
| 713 continue; | |
| 714 } | |
| 715 | |
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716 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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717 lrcf->nodelay = 1; |
| 2294 | 718 continue; |
| 719 } | |
| 720 | |
| 721 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 722 "invalid parameter \"%V\"", &value[i]); | |
| 980 | 723 return NGX_CONF_ERROR; |
| 724 } | |
| 725 | |
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726 if (lrcf->shm_zone == NULL) { |
| 980 | 727 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 728 "\"%V\" must have \"zone\" parameter", |
| 729 &cmd->name); | |
| 980 | 730 return NGX_CONF_ERROR; |
| 731 } | |
| 732 | |
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733 if (lrcf->shm_zone->data == NULL) { |
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734 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 735 "unknown limit_req_zone \"%V\"", |
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736 &lrcf->shm_zone->name); |
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737 return NGX_CONF_ERROR; |
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738 } |
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739 |
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740 lrcf->burst = burst * 1000; |
| 980 | 741 |
| 742 return NGX_CONF_OK; | |
| 743 } | |
| 744 | |
| 745 | |
| 746 static ngx_int_t | |
| 2294 | 747 ngx_http_limit_req_init(ngx_conf_t *cf) |
| 980 | 748 { |
| 749 ngx_http_handler_pt *h; | |
| 750 ngx_http_core_main_conf_t *cmcf; | |
| 751 | |
| 752 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 753 | |
| 754 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 755 if (h == NULL) { | |
| 756 return NGX_ERROR; | |
| 757 } | |
| 758 | |
| 2294 | 759 *h = ngx_http_limit_req_handler; |
| 980 | 760 |
| 761 return NGX_OK; | |
| 762 } |