Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 3183:b87542338ac3
make limit_req to conform to the leaky bucket algorithm
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 06 Oct 2009 09:37:18 +0000 |
| parents | 70c8b2d28d1d |
| children | 30570a5b9bb0 |
| 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; |
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45 ngx_uint_t nodelay;/* unsigned nodelay:1 */ |
| 2294 | 46 } ngx_http_limit_req_conf_t; |
| 980 | 47 |
| 48 | |
| 2294 | 49 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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50 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, |
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51 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lrp); |
| 2294 | 52 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
| 53 ngx_uint_t n); | |
| 980 | 54 |
| 2294 | 55 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
| 56 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
| 980 | 57 void *child); |
| 2294 | 58 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 59 void *conf); |
| 2294 | 60 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 61 void *conf); |
| 2294 | 62 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
| 980 | 63 |
| 64 | |
| 2294 | 65 static ngx_command_t ngx_http_limit_req_commands[] = { |
| 980 | 66 |
| 2294 | 67 { ngx_string("limit_req_zone"), |
| 987 | 68 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
| 2294 | 69 ngx_http_limit_req_zone, |
| 980 | 70 0, |
| 71 0, | |
| 72 NULL }, | |
| 73 | |
| 2294 | 74 { ngx_string("limit_req"), |
| 75 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
| 76 ngx_http_limit_req, | |
| 980 | 77 NGX_HTTP_LOC_CONF_OFFSET, |
| 78 0, | |
| 79 NULL }, | |
| 80 | |
| 81 ngx_null_command | |
| 82 }; | |
| 83 | |
| 84 | |
| 2294 | 85 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
| 980 | 86 NULL, /* preconfiguration */ |
| 2294 | 87 ngx_http_limit_req_init, /* postconfiguration */ |
| 980 | 88 |
| 89 NULL, /* create main configuration */ | |
| 90 NULL, /* init main configuration */ | |
| 91 | |
| 92 NULL, /* create server configuration */ | |
| 93 NULL, /* merge server configuration */ | |
| 94 | |
| 2294 | 95 ngx_http_limit_req_create_conf, /* create location configration */ |
| 96 ngx_http_limit_req_merge_conf /* merge location configration */ | |
| 980 | 97 }; |
| 98 | |
| 99 | |
| 2294 | 100 ngx_module_t ngx_http_limit_req_module = { |
| 980 | 101 NGX_MODULE_V1, |
| 2294 | 102 &ngx_http_limit_req_module_ctx, /* module context */ |
| 103 ngx_http_limit_req_commands, /* module directives */ | |
| 980 | 104 NGX_HTTP_MODULE, /* module type */ |
| 105 NULL, /* init master */ | |
| 106 NULL, /* init module */ | |
| 107 NULL, /* init process */ | |
| 108 NULL, /* init thread */ | |
| 109 NULL, /* exit thread */ | |
| 110 NULL, /* exit process */ | |
| 111 NULL, /* exit master */ | |
| 112 NGX_MODULE_V1_PADDING | |
| 113 }; | |
| 114 | |
| 115 | |
| 116 static ngx_int_t | |
| 2294 | 117 ngx_http_limit_req_handler(ngx_http_request_t *r) |
| 980 | 118 { |
| 2294 | 119 size_t len, n; |
| 120 uint32_t hash; | |
| 121 ngx_int_t rc; | |
| 2313 | 122 ngx_uint_t excess; |
| 2294 | 123 ngx_time_t *tp; |
| 124 ngx_rbtree_node_t *node; | |
| 125 ngx_http_variable_value_t *vv; | |
| 126 ngx_http_limit_req_ctx_t *ctx; | |
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127 ngx_http_limit_req_node_t *lr; |
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128 ngx_http_limit_req_conf_t *lrcf; |
| 980 | 129 |
| 2294 | 130 if (r->main->limit_req_set) { |
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131 return NGX_DECLINED; |
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132 } |
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133 |
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134 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
| 980 | 135 |
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136 if (lrcf->shm_zone == NULL) { |
| 980 | 137 return NGX_DECLINED; |
| 138 } | |
| 139 | |
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140 ctx = lrcf->shm_zone->data; |
| 987 | 141 |
| 142 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
| 980 | 143 |
| 144 if (vv == NULL || vv->not_found) { | |
| 145 return NGX_DECLINED; | |
| 146 } | |
| 147 | |
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148 len = vv->len; |
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149 |
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150 if (len == 0) { |
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151 return NGX_DECLINED; |
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152 } |
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153 |
| 2294 | 154 if (len > 65535) { |
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155 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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156 "the value of the \"%V\" variable " |
| 2294 | 157 "is more than 65535 bytes: \"%v\"", |
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158 &ctx->var, vv); |
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159 return NGX_DECLINED; |
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160 } |
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161 |
| 2294 | 162 r->main->limit_req_set = 1; |
| 980 | 163 |
| 164 hash = ngx_crc32_short(vv->data, len); | |
| 165 | |
| 2294 | 166 ngx_shmtx_lock(&ctx->shpool->mutex); |
| 167 | |
| 168 ngx_http_limit_req_expire(ctx, 1); | |
| 169 | |
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170 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr); |
| 2294 | 171 |
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172 if (lr) { |
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173 ngx_queue_remove(&lr->queue); |
| 2294 | 174 |
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175 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
| 2294 | 176 |
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177 excess = lr->excess; |
| 2294 | 178 |
| 179 } else { | |
| 2313 | 180 excess = 0; |
| 980 | 181 } |
| 182 | |
| 2313 | 183 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 2973 | 184 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000); |
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185 |
| 2294 | 186 if (rc == NGX_BUSY) { |
| 187 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
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188 |
| 2294 | 189 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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190 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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191 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
| 980 | 192 |
| 193 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 194 } | |
| 195 | |
| 2294 | 196 if (rc == NGX_AGAIN) { |
| 197 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 198 | |
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199 if (lrcf->nodelay) { |
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200 return NGX_DECLINED; |
| 2294 | 201 } |
| 202 | |
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203 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0, |
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204 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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205 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); |
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206 |
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207 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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208 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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209 } |
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210 |
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211 r->read_event_handler = ngx_http_test_reading; |
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212 r->write_event_handler = ngx_http_limit_req_delay; |
| 2313 | 213 ngx_add_timer(r->connection->write, (ngx_msec_t) excess); |
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214 |
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215 return NGX_AGAIN; |
| 2294 | 216 } |
| 217 | |
| 218 if (rc == NGX_OK) { | |
| 219 goto done; | |
| 220 } | |
| 221 | |
| 222 /* rc == NGX_DECLINED */ | |
| 223 | |
| 224 n = offsetof(ngx_rbtree_node_t, color) | |
| 225 + offsetof(ngx_http_limit_req_node_t, data) | |
| 226 + len; | |
| 227 | |
| 228 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 229 if (node == NULL) { | |
| 230 | |
| 231 ngx_http_limit_req_expire(ctx, 0); | |
| 232 | |
| 233 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 234 if (node == NULL) { | |
| 235 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 236 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 237 } | |
| 238 } | |
| 239 | |
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240 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 241 |
| 242 node->key = hash; | |
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243 lr->len = (u_char) len; |
| 2294 | 244 |
| 245 tp = ngx_timeofday(); | |
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246 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
| 2294 | 247 |
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248 lr->excess = 0; |
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249 ngx_memcpy(lr->data, vv->data, len); |
| 980 | 250 |
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251 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
| 980 | 252 |
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253 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
| 2294 | 254 |
| 980 | 255 done: |
| 256 | |
| 2294 | 257 ngx_shmtx_unlock(&ctx->shpool->mutex); |
| 980 | 258 |
| 259 return NGX_DECLINED; | |
| 260 } | |
| 261 | |
| 262 | |
| 263 static void | |
| 2294 | 264 ngx_http_limit_req_delay(ngx_http_request_t *r) |
| 265 { | |
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266 ngx_event_t *wev; |
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267 |
| 2294 | 268 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 2973 | 269 "limit_req delay"); |
| 2294 | 270 |
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271 wev = r->connection->write; |
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272 |
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273 if (!wev->timedout) { |
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274 |
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275 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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276 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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277 } |
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278 |
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279 return; |
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280 } |
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281 |
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282 wev->timedout = 0; |
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283 |
| 2294 | 284 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
| 285 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| 286 return; | |
| 287 } | |
| 288 | |
| 289 r->read_event_handler = ngx_http_block_reading; | |
| 290 r->write_event_handler = ngx_http_core_run_phases; | |
| 291 | |
| 292 ngx_http_core_run_phases(r); | |
| 293 } | |
| 294 | |
| 295 | |
| 296 static void | |
| 297 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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298 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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299 { |
| 2294 | 300 ngx_rbtree_node_t **p; |
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301 ngx_http_limit_req_node_t *lrn, *lrnt; |
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302 |
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303 for ( ;; ) { |
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304 |
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305 if (node->key < temp->key) { |
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306 |
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307 p = &temp->left; |
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308 |
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309 } else if (node->key > temp->key) { |
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310 |
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311 p = &temp->right; |
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312 |
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313 } else { /* node->key == temp->key */ |
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314 |
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315 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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316 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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317 |
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318 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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319 ? &temp->left : &temp->right; |
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320 } |
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321 |
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322 if (*p == sentinel) { |
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323 break; |
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324 } |
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325 |
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326 temp = *p; |
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327 } |
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328 |
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329 *p = node; |
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330 node->parent = temp; |
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331 node->left = sentinel; |
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332 node->right = sentinel; |
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333 ngx_rbt_red(node); |
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334 } |
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335 |
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336 |
| 2294 | 337 static ngx_int_t |
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338 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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339 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp) |
| 980 | 340 { |
| 2313 | 341 ngx_int_t rc, excess; |
| 2294 | 342 ngx_time_t *tp; |
| 343 ngx_msec_t now; | |
| 344 ngx_msec_int_t ms; | |
| 345 ngx_rbtree_node_t *node, *sentinel; | |
| 346 ngx_http_limit_req_ctx_t *ctx; | |
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347 ngx_http_limit_req_node_t *lr; |
| 2294 | 348 |
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349 ctx = lrcf->shm_zone->data; |
| 2294 | 350 |
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351 node = ctx->sh->rbtree.root; |
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352 sentinel = ctx->sh->rbtree.sentinel; |
| 980 | 353 |
| 2294 | 354 while (node != sentinel) { |
| 355 | |
| 356 if (hash < node->key) { | |
| 357 node = node->left; | |
| 358 continue; | |
| 359 } | |
| 360 | |
| 361 if (hash > node->key) { | |
| 362 node = node->right; | |
| 363 continue; | |
| 364 } | |
| 365 | |
| 366 /* hash == node->key */ | |
| 367 | |
| 368 do { | |
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369 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 370 |
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371 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
| 2294 | 372 |
| 373 if (rc == 0) { | |
| 374 | |
| 375 tp = ngx_timeofday(); | |
| 980 | 376 |
| 2294 | 377 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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378 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 379 |
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380 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
| 2294 | 381 |
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382 if ((ngx_uint_t) excess > lrcf->burst) { |
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383 *lrp = lr; |
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384 return NGX_BUSY; |
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385 } |
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386 |
| 2313 | 387 if (excess < 0) { |
| 388 excess = 0; | |
| 2294 | 389 } |
| 390 | |
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391 lr->excess = excess; |
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392 lr->last = now; |
| 980 | 393 |
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394 *lrp = lr; |
| 2294 | 395 |
| 2313 | 396 if (excess) { |
| 2294 | 397 return NGX_AGAIN; |
| 398 } | |
| 980 | 399 |
| 2294 | 400 return NGX_OK; |
| 401 } | |
| 402 | |
| 403 node = (rc < 0) ? node->left : node->right; | |
| 404 | |
| 405 } while (node != sentinel && hash == node->key); | |
| 406 | |
| 407 break; | |
| 980 | 408 } |
| 409 | |
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410 *lrp = NULL; |
| 2294 | 411 |
| 412 return NGX_DECLINED; | |
| 413 } | |
| 414 | |
| 415 | |
| 416 static void | |
| 417 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
| 418 { | |
| 2313 | 419 ngx_int_t excess; |
| 2294 | 420 ngx_time_t *tp; |
| 421 ngx_msec_t now; | |
| 422 ngx_queue_t *q; | |
| 423 ngx_msec_int_t ms; | |
| 424 ngx_rbtree_node_t *node; | |
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425 ngx_http_limit_req_node_t *lr; |
| 2294 | 426 |
| 427 tp = ngx_timeofday(); | |
| 428 | |
| 429 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
| 430 | |
| 431 /* | |
| 432 * n == 1 deletes one or two zero rate entries | |
| 433 * n == 0 deletes oldest entry by force | |
| 434 * and one or two zero rate entries | |
| 435 */ | |
| 436 | |
| 437 while (n < 3) { | |
| 438 | |
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439 if (ngx_queue_empty(&ctx->sh->queue)) { |
| 2294 | 440 return; |
| 441 } | |
| 442 | |
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443 q = ngx_queue_last(&ctx->sh->queue); |
| 2294 | 444 |
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445 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
| 2294 | 446 |
| 447 if (n++ != 0) { | |
| 448 | |
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449 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 450 ms = ngx_abs(ms); |
| 451 | |
| 452 if (ms < 60000) { | |
| 453 return; | |
| 454 } | |
| 455 | |
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456 excess = lr->excess - ctx->rate * ms / 1000; |
| 2294 | 457 |
| 2313 | 458 if (excess > 0) { |
| 2294 | 459 return; |
| 460 } | |
| 461 } | |
| 462 | |
| 463 ngx_queue_remove(q); | |
| 464 | |
| 465 node = (ngx_rbtree_node_t *) | |
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466 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
| 2294 | 467 |
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468 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
| 2294 | 469 |
| 470 ngx_slab_free_locked(ctx->shpool, node); | |
| 471 } | |
| 980 | 472 } |
| 473 | |
| 474 | |
| 475 static ngx_int_t | |
| 2294 | 476 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 477 { |
| 2294 | 478 ngx_http_limit_req_ctx_t *octx = data; |
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479 |
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480 size_t len; |
| 2294 | 481 ngx_http_limit_req_ctx_t *ctx; |
| 980 | 482 |
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483 ctx = shm_zone->data; |
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484 |
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485 if (octx) { |
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486 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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487 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 2294 | 488 "limit_req \"%V\" uses the \"%V\" variable " |
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489 "while previously it used the \"%V\" variable", |
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490 &shm_zone->shm.name, &ctx->var, &octx->var); |
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491 return NGX_ERROR; |
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492 } |
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493 |
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494 ctx->sh = octx->sh; |
| 2294 | 495 ctx->shpool = octx->shpool; |
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496 |
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497 return NGX_OK; |
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498 } |
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499 |
| 2294 | 500 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 980 | 501 |
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502 if (shm_zone->shm.exists) { |
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503 ctx->sh = ctx->shpool->data; |
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504 |
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505 return NGX_OK; |
| 980 | 506 } |
| 507 | |
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508 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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509 if (ctx->sh == NULL) { |
| 980 | 510 return NGX_ERROR; |
| 511 } | |
| 512 | |
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513 ctx->shpool->data = ctx->sh; |
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514 |
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515 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
| 2294 | 516 ngx_http_limit_req_rbtree_insert_value); |
| 517 | |
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518 ngx_queue_init(&ctx->sh->queue); |
| 980 | 519 |
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520 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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521 |
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522 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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523 if (ctx->shpool->log_ctx == NULL) { |
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524 return NGX_ERROR; |
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525 } |
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526 |
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527 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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528 &shm_zone->shm.name); |
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529 |
| 980 | 530 return NGX_OK; |
| 531 } | |
| 532 | |
| 533 | |
| 534 static void * | |
| 2294 | 535 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
| 980 | 536 { |
| 2294 | 537 ngx_http_limit_req_conf_t *conf; |
| 980 | 538 |
| 2294 | 539 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
| 980 | 540 if (conf == NULL) { |
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541 return NULL; |
| 980 | 542 } |
| 543 | |
| 544 /* | |
| 545 * set by ngx_pcalloc(): | |
| 546 * | |
| 547 * conf->shm_zone = NULL; | |
| 2375 | 548 * conf->burst = 0; |
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549 * conf->nodelay = 0; |
| 980 | 550 */ |
| 551 | |
| 552 return conf; | |
| 553 } | |
| 554 | |
| 555 | |
| 556 static char * | |
| 2294 | 557 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
| 980 | 558 { |
| 2294 | 559 ngx_http_limit_req_conf_t *prev = parent; |
| 560 ngx_http_limit_req_conf_t *conf = child; | |
| 980 | 561 |
| 562 if (conf->shm_zone == NULL) { | |
| 563 *conf = *prev; | |
| 564 } | |
| 565 | |
| 566 return NGX_CONF_OK; | |
| 567 } | |
| 568 | |
| 569 | |
| 570 static char * | |
| 2294 | 571 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 572 { |
| 2294 | 573 u_char *p; |
| 574 size_t size, len; | |
| 575 ngx_str_t *value, name, s; | |
| 576 ngx_int_t rate, scale; | |
| 577 ngx_uint_t i; | |
| 578 ngx_shm_zone_t *shm_zone; | |
| 579 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 580 |
| 581 value = cf->args->elts; | |
| 582 | |
| 2294 | 583 ctx = NULL; |
| 584 size = 0; | |
| 585 rate = 1; | |
| 586 scale = 1; | |
| 587 name.len = 0; | |
| 588 | |
| 589 for (i = 1; i < cf->args->nelts; i++) { | |
| 590 | |
| 591 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 592 | |
| 593 name.data = value[i].data + 5; | |
| 594 | |
| 595 p = (u_char *) ngx_strchr(name.data, ':'); | |
| 596 | |
| 597 if (p) { | |
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598 *p = '\0'; |
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599 |
| 2294 | 600 name.len = p - name.data; |
| 601 | |
| 602 p++; | |
| 603 | |
| 604 s.len = value[i].data + value[i].len - p; | |
| 605 s.data = p; | |
| 606 | |
| 607 size = ngx_parse_size(&s); | |
| 608 if (size > 8191) { | |
| 609 continue; | |
| 610 } | |
| 611 } | |
| 612 | |
| 613 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 614 "invalid zone size \"%V\"", &value[i]); | |
| 615 return NGX_CONF_ERROR; | |
| 616 } | |
| 617 | |
| 618 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
| 619 | |
| 620 len = value[i].len; | |
| 621 p = value[i].data + len - 3; | |
| 987 | 622 |
| 2294 | 623 if (ngx_strncmp(p, "r/s", 3) == 0) { |
| 624 scale = 1; | |
| 625 len -= 3; | |
| 626 | |
| 627 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
| 628 scale = 60; | |
| 629 len -= 3; | |
| 630 } | |
| 631 | |
| 632 rate = ngx_atoi(value[i].data + 5, len - 5); | |
| 633 if (rate <= NGX_ERROR) { | |
| 634 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 635 "invalid rate \"%V\"", &value[i]); | |
| 636 return NGX_CONF_ERROR; | |
| 637 } | |
| 638 | |
| 639 continue; | |
| 640 } | |
| 641 | |
| 642 if (value[i].data[0] == '$') { | |
| 987 | 643 |
| 2294 | 644 value[i].len--; |
| 645 value[i].data++; | |
| 646 | |
| 647 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
| 648 if (ctx == NULL) { | |
| 649 return NGX_CONF_ERROR; | |
| 650 } | |
| 651 | |
| 652 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
| 653 if (ctx->index == NGX_ERROR) { | |
| 654 return NGX_CONF_ERROR; | |
| 655 } | |
| 656 | |
| 657 ctx->var = value[i]; | |
| 658 | |
| 659 continue; | |
| 660 } | |
| 661 | |
| 662 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 663 "invalid parameter \"%V\"", &value[i]); | |
| 987 | 664 return NGX_CONF_ERROR; |
| 665 } | |
| 666 | |
| 2294 | 667 if (name.len == 0 || size == 0) { |
| 668 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 669 "\"%V\" must have \"zone\" parameter", | |
| 670 &cmd->name); | |
| 987 | 671 return NGX_CONF_ERROR; |
| 672 } | |
| 673 | |
| 2294 | 674 if (ctx == NULL) { |
| 980 | 675 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 676 "no variable is defined for limit_req_zone \"%V\"", |
| 677 &cmd->name); | |
| 980 | 678 return NGX_CONF_ERROR; |
| 679 } | |
| 680 | |
| 2313 | 681 ctx->rate = rate * 1000 / scale; |
| 980 | 682 |
| 2294 | 683 shm_zone = ngx_shared_memory_add(cf, &name, size, |
| 684 &ngx_http_limit_req_module); | |
| 980 | 685 if (shm_zone == NULL) { |
| 686 return NGX_CONF_ERROR; | |
| 687 } | |
| 688 | |
| 987 | 689 if (shm_zone->data) { |
| 690 ctx = shm_zone->data; | |
| 691 | |
| 692 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 2294 | 693 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
| 694 &value[1], &ctx->var); | |
| 987 | 695 return NGX_CONF_ERROR; |
| 696 } | |
| 697 | |
| 2294 | 698 shm_zone->init = ngx_http_limit_req_init_zone; |
| 987 | 699 shm_zone->data = ctx; |
| 980 | 700 |
| 701 return NGX_CONF_OK; | |
| 702 } | |
| 703 | |
| 704 | |
| 705 static char * | |
| 2294 | 706 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 707 { |
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708 ngx_http_limit_req_conf_t *lrcf = conf; |
| 980 | 709 |
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710 ngx_int_t burst; |
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711 ngx_str_t *value, s; |
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712 ngx_uint_t i; |
| 2294 | 713 |
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714 if (lrcf->shm_zone) { |
| 2294 | 715 return "is duplicate"; |
| 716 } | |
| 980 | 717 |
| 718 value = cf->args->elts; | |
| 719 | |
| 2294 | 720 burst = 0; |
| 721 | |
| 722 for (i = 1; i < cf->args->nelts; i++) { | |
| 723 | |
| 724 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 725 | |
| 726 s.len = value[i].len - 5; | |
| 727 s.data = value[i].data + 5; | |
| 728 | |
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729 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
| 2294 | 730 &ngx_http_limit_req_module); |
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731 if (lrcf->shm_zone == NULL) { |
| 2294 | 732 return NGX_CONF_ERROR; |
| 733 } | |
| 734 | |
| 735 continue; | |
| 736 } | |
| 737 | |
| 738 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
| 739 | |
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740 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
| 2294 | 741 if (burst <= 0) { |
| 742 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 743 "invalid burst rate \"%V\"", &value[i]); | |
| 744 return NGX_CONF_ERROR; | |
| 745 } | |
| 746 | |
| 747 continue; | |
| 748 } | |
| 749 | |
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750 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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751 lrcf->nodelay = 1; |
| 2294 | 752 continue; |
| 753 } | |
| 754 | |
| 755 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 756 "invalid parameter \"%V\"", &value[i]); | |
| 980 | 757 return NGX_CONF_ERROR; |
| 758 } | |
| 759 | |
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760 if (lrcf->shm_zone == NULL) { |
| 980 | 761 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 762 "\"%V\" must have \"zone\" parameter", |
| 763 &cmd->name); | |
| 980 | 764 return NGX_CONF_ERROR; |
| 765 } | |
| 766 | |
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767 if (lrcf->shm_zone->data == NULL) { |
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768 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 769 "unknown limit_req_zone \"%V\"", |
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770 &lrcf->shm_zone->shm.name); |
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771 return NGX_CONF_ERROR; |
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772 } |
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773 |
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774 lrcf->burst = burst * 1000; |
| 980 | 775 |
| 776 return NGX_CONF_OK; | |
| 777 } | |
| 778 | |
| 779 | |
| 780 static ngx_int_t | |
| 2294 | 781 ngx_http_limit_req_init(ngx_conf_t *cf) |
| 980 | 782 { |
| 783 ngx_http_handler_pt *h; | |
| 784 ngx_http_core_main_conf_t *cmcf; | |
| 785 | |
| 786 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 787 | |
| 788 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 789 if (h == NULL) { | |
| 790 return NGX_ERROR; | |
| 791 } | |
| 792 | |
| 2294 | 793 *h = ngx_http_limit_req_handler; |
| 980 | 794 |
| 795 return NGX_OK; | |
| 796 } |