Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 2720:b3b8c66bd520
support attaching to an existent Win32 shared memory
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sat, 18 Apr 2009 19:27:28 +0000 |
| parents | d5896f6608e8 |
| children | c7d57b539248 |
| 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, |
| 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 { | |
| 266 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 267 "limit_req delay"); | |
| 268 | |
| 269 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { | |
| 270 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| 271 return; | |
| 272 } | |
| 273 | |
| 274 r->read_event_handler = ngx_http_block_reading; | |
| 275 r->write_event_handler = ngx_http_core_run_phases; | |
| 276 | |
| 277 ngx_http_core_run_phases(r); | |
| 278 } | |
| 279 | |
| 280 | |
| 281 static void | |
| 282 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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283 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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284 { |
| 2294 | 285 ngx_rbtree_node_t **p; |
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286 ngx_http_limit_req_node_t *lrn, *lrnt; |
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287 |
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288 for ( ;; ) { |
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289 |
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290 if (node->key < temp->key) { |
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291 |
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292 p = &temp->left; |
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293 |
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294 } else if (node->key > temp->key) { |
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295 |
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296 p = &temp->right; |
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297 |
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298 } else { /* node->key == temp->key */ |
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299 |
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300 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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301 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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302 |
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303 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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304 ? &temp->left : &temp->right; |
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305 } |
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306 |
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307 if (*p == sentinel) { |
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308 break; |
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309 } |
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310 |
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311 temp = *p; |
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312 } |
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313 |
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314 *p = node; |
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315 node->parent = temp; |
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316 node->left = sentinel; |
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317 node->right = sentinel; |
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318 ngx_rbt_red(node); |
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319 } |
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320 |
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321 |
| 2294 | 322 static ngx_int_t |
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323 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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324 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp) |
| 980 | 325 { |
| 2313 | 326 ngx_int_t rc, excess; |
| 2294 | 327 ngx_time_t *tp; |
| 328 ngx_msec_t now; | |
| 329 ngx_msec_int_t ms; | |
| 330 ngx_rbtree_node_t *node, *sentinel; | |
| 331 ngx_http_limit_req_ctx_t *ctx; | |
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332 ngx_http_limit_req_node_t *lr; |
| 2294 | 333 |
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334 ctx = lrcf->shm_zone->data; |
| 2294 | 335 |
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336 node = ctx->sh->rbtree.root; |
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337 sentinel = ctx->sh->rbtree.sentinel; |
| 980 | 338 |
| 2294 | 339 while (node != sentinel) { |
| 340 | |
| 341 if (hash < node->key) { | |
| 342 node = node->left; | |
| 343 continue; | |
| 344 } | |
| 345 | |
| 346 if (hash > node->key) { | |
| 347 node = node->right; | |
| 348 continue; | |
| 349 } | |
| 350 | |
| 351 /* hash == node->key */ | |
| 352 | |
| 353 do { | |
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354 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 355 |
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356 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
| 2294 | 357 |
| 358 if (rc == 0) { | |
| 359 | |
| 360 tp = ngx_timeofday(); | |
| 980 | 361 |
| 2294 | 362 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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363 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 364 |
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365 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
| 2294 | 366 |
| 2313 | 367 if (excess < 0) { |
| 368 excess = 0; | |
| 2294 | 369 } |
| 370 | |
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371 lr->excess = excess; |
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372 lr->last = now; |
| 980 | 373 |
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374 *lrp = lr; |
| 2294 | 375 |
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376 if ((ngx_uint_t) excess > lrcf->burst) { |
| 2294 | 377 return NGX_BUSY; |
| 378 } | |
| 980 | 379 |
| 2313 | 380 if (excess) { |
| 2294 | 381 return NGX_AGAIN; |
| 382 } | |
| 980 | 383 |
| 2294 | 384 return NGX_OK; |
| 385 } | |
| 386 | |
| 387 node = (rc < 0) ? node->left : node->right; | |
| 388 | |
| 389 } while (node != sentinel && hash == node->key); | |
| 390 | |
| 391 break; | |
| 980 | 392 } |
| 393 | |
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394 *lrp = NULL; |
| 2294 | 395 |
| 396 return NGX_DECLINED; | |
| 397 } | |
| 398 | |
| 399 | |
| 400 static void | |
| 401 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
| 402 { | |
| 2313 | 403 ngx_int_t excess; |
| 2294 | 404 ngx_time_t *tp; |
| 405 ngx_msec_t now; | |
| 406 ngx_queue_t *q; | |
| 407 ngx_msec_int_t ms; | |
| 408 ngx_rbtree_node_t *node; | |
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409 ngx_http_limit_req_node_t *lr; |
| 2294 | 410 |
| 411 tp = ngx_timeofday(); | |
| 412 | |
| 413 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
| 414 | |
| 415 /* | |
| 416 * n == 1 deletes one or two zero rate entries | |
| 417 * n == 0 deletes oldest entry by force | |
| 418 * and one or two zero rate entries | |
| 419 */ | |
| 420 | |
| 421 while (n < 3) { | |
| 422 | |
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423 if (ngx_queue_empty(&ctx->sh->queue)) { |
| 2294 | 424 return; |
| 425 } | |
| 426 | |
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427 q = ngx_queue_last(&ctx->sh->queue); |
| 2294 | 428 |
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429 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
| 2294 | 430 |
| 431 if (n++ != 0) { | |
| 432 | |
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433 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 434 ms = ngx_abs(ms); |
| 435 | |
| 436 if (ms < 60000) { | |
| 437 return; | |
| 438 } | |
| 439 | |
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440 excess = lr->excess - ctx->rate * ms / 1000; |
| 2294 | 441 |
| 2313 | 442 if (excess > 0) { |
| 2294 | 443 return; |
| 444 } | |
| 445 } | |
| 446 | |
| 447 ngx_queue_remove(q); | |
| 448 | |
| 449 node = (ngx_rbtree_node_t *) | |
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450 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
| 2294 | 451 |
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452 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
| 2294 | 453 |
| 454 ngx_slab_free_locked(ctx->shpool, node); | |
| 455 } | |
| 980 | 456 } |
| 457 | |
| 458 | |
| 459 static ngx_int_t | |
| 2294 | 460 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 461 { |
| 2294 | 462 ngx_http_limit_req_ctx_t *octx = data; |
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463 |
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464 size_t len; |
| 2294 | 465 ngx_http_limit_req_ctx_t *ctx; |
| 980 | 466 |
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467 ctx = shm_zone->data; |
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468 |
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469 if (octx) { |
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470 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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471 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 2294 | 472 "limit_req \"%V\" uses the \"%V\" variable " |
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473 "while previously it used the \"%V\" variable", |
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474 &shm_zone->shm.name, &ctx->var, &octx->var); |
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475 return NGX_ERROR; |
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476 } |
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477 |
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478 ctx->sh = octx->sh; |
| 2294 | 479 ctx->shpool = octx->shpool; |
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480 |
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481 return NGX_OK; |
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482 } |
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483 |
| 2294 | 484 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 980 | 485 |
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486 if (shm_zone->shm.exists) { |
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487 ctx->sh = ctx->shpool->data; |
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488 |
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489 return NGX_OK; |
| 980 | 490 } |
| 491 | |
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492 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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493 if (ctx->sh == NULL) { |
| 980 | 494 return NGX_ERROR; |
| 495 } | |
| 496 | |
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497 ctx->shpool->data = ctx->sh; |
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498 |
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499 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
| 2294 | 500 ngx_http_limit_req_rbtree_insert_value); |
| 501 | |
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502 ngx_queue_init(&ctx->sh->queue); |
| 980 | 503 |
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504 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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505 |
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506 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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507 if (ctx->shpool->log_ctx == NULL) { |
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508 return NGX_ERROR; |
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509 } |
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510 |
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511 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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512 &shm_zone->shm.name); |
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513 |
| 980 | 514 return NGX_OK; |
| 515 } | |
| 516 | |
| 517 | |
| 518 static void * | |
| 2294 | 519 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
| 980 | 520 { |
| 2294 | 521 ngx_http_limit_req_conf_t *conf; |
| 980 | 522 |
| 2294 | 523 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
| 980 | 524 if (conf == NULL) { |
| 525 return NGX_CONF_ERROR; | |
| 526 } | |
| 527 | |
| 528 /* | |
| 529 * set by ngx_pcalloc(): | |
| 530 * | |
| 531 * conf->shm_zone = NULL; | |
| 2375 | 532 * conf->burst = 0; |
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533 * conf->nodelay = 0; |
| 980 | 534 */ |
| 535 | |
| 536 return conf; | |
| 537 } | |
| 538 | |
| 539 | |
| 540 static char * | |
| 2294 | 541 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
| 980 | 542 { |
| 2294 | 543 ngx_http_limit_req_conf_t *prev = parent; |
| 544 ngx_http_limit_req_conf_t *conf = child; | |
| 980 | 545 |
| 546 if (conf->shm_zone == NULL) { | |
| 547 *conf = *prev; | |
| 548 } | |
| 549 | |
| 550 return NGX_CONF_OK; | |
| 551 } | |
| 552 | |
| 553 | |
| 554 static char * | |
| 2294 | 555 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 556 { |
| 2294 | 557 u_char *p; |
| 558 size_t size, len; | |
| 559 ngx_str_t *value, name, s; | |
| 560 ngx_int_t rate, scale; | |
| 561 ngx_uint_t i; | |
| 562 ngx_shm_zone_t *shm_zone; | |
| 563 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 564 |
| 565 value = cf->args->elts; | |
| 566 | |
| 2294 | 567 ctx = NULL; |
| 568 size = 0; | |
| 569 rate = 1; | |
| 570 scale = 1; | |
| 571 name.len = 0; | |
| 572 | |
| 573 for (i = 1; i < cf->args->nelts; i++) { | |
| 574 | |
| 575 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 576 | |
| 577 name.data = value[i].data + 5; | |
| 578 | |
| 579 p = (u_char *) ngx_strchr(name.data, ':'); | |
| 580 | |
| 581 if (p) { | |
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582 *p = '\0'; |
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583 |
| 2294 | 584 name.len = p - name.data; |
| 585 | |
| 586 p++; | |
| 587 | |
| 588 s.len = value[i].data + value[i].len - p; | |
| 589 s.data = p; | |
| 590 | |
| 591 size = ngx_parse_size(&s); | |
| 592 if (size > 8191) { | |
| 593 continue; | |
| 594 } | |
| 595 } | |
| 596 | |
| 597 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 598 "invalid zone size \"%V\"", &value[i]); | |
| 599 return NGX_CONF_ERROR; | |
| 600 } | |
| 601 | |
| 602 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
| 603 | |
| 604 len = value[i].len; | |
| 605 p = value[i].data + len - 3; | |
| 987 | 606 |
| 2294 | 607 if (ngx_strncmp(p, "r/s", 3) == 0) { |
| 608 scale = 1; | |
| 609 len -= 3; | |
| 610 | |
| 611 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
| 612 scale = 60; | |
| 613 len -= 3; | |
| 614 } | |
| 615 | |
| 616 rate = ngx_atoi(value[i].data + 5, len - 5); | |
| 617 if (rate <= NGX_ERROR) { | |
| 618 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 619 "invalid rate \"%V\"", &value[i]); | |
| 620 return NGX_CONF_ERROR; | |
| 621 } | |
| 622 | |
| 623 continue; | |
| 624 } | |
| 625 | |
| 626 if (value[i].data[0] == '$') { | |
| 987 | 627 |
| 2294 | 628 value[i].len--; |
| 629 value[i].data++; | |
| 630 | |
| 631 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
| 632 if (ctx == NULL) { | |
| 633 return NGX_CONF_ERROR; | |
| 634 } | |
| 635 | |
| 636 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
| 637 if (ctx->index == NGX_ERROR) { | |
| 638 return NGX_CONF_ERROR; | |
| 639 } | |
| 640 | |
| 641 ctx->var = value[i]; | |
| 642 | |
| 643 continue; | |
| 644 } | |
| 645 | |
| 646 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 647 "invalid parameter \"%V\"", &value[i]); | |
| 987 | 648 return NGX_CONF_ERROR; |
| 649 } | |
| 650 | |
| 2294 | 651 if (name.len == 0 || size == 0) { |
| 652 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 653 "\"%V\" must have \"zone\" parameter", | |
| 654 &cmd->name); | |
| 987 | 655 return NGX_CONF_ERROR; |
| 656 } | |
| 657 | |
| 2294 | 658 if (ctx == NULL) { |
| 980 | 659 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 660 "no variable is defined for limit_req_zone \"%V\"", |
| 661 &cmd->name); | |
| 980 | 662 return NGX_CONF_ERROR; |
| 663 } | |
| 664 | |
| 2313 | 665 ctx->rate = rate * 1000 / scale; |
| 980 | 666 |
| 2294 | 667 shm_zone = ngx_shared_memory_add(cf, &name, size, |
| 668 &ngx_http_limit_req_module); | |
| 980 | 669 if (shm_zone == NULL) { |
| 670 return NGX_CONF_ERROR; | |
| 671 } | |
| 672 | |
| 987 | 673 if (shm_zone->data) { |
| 674 ctx = shm_zone->data; | |
| 675 | |
| 676 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 2294 | 677 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
| 678 &value[1], &ctx->var); | |
| 987 | 679 return NGX_CONF_ERROR; |
| 680 } | |
| 681 | |
| 2294 | 682 shm_zone->init = ngx_http_limit_req_init_zone; |
| 987 | 683 shm_zone->data = ctx; |
| 980 | 684 |
| 685 return NGX_CONF_OK; | |
| 686 } | |
| 687 | |
| 688 | |
| 689 static char * | |
| 2294 | 690 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 691 { |
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692 ngx_http_limit_req_conf_t *lrcf = conf; |
| 980 | 693 |
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694 ngx_int_t burst; |
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695 ngx_str_t *value, s; |
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696 ngx_uint_t i; |
| 2294 | 697 |
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698 if (lrcf->shm_zone) { |
| 2294 | 699 return "is duplicate"; |
| 700 } | |
| 980 | 701 |
| 702 value = cf->args->elts; | |
| 703 | |
| 2294 | 704 burst = 0; |
| 705 | |
| 706 for (i = 1; i < cf->args->nelts; i++) { | |
| 707 | |
| 708 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 709 | |
| 710 s.len = value[i].len - 5; | |
| 711 s.data = value[i].data + 5; | |
| 712 | |
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713 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
| 2294 | 714 &ngx_http_limit_req_module); |
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715 if (lrcf->shm_zone == NULL) { |
| 2294 | 716 return NGX_CONF_ERROR; |
| 717 } | |
| 718 | |
| 719 continue; | |
| 720 } | |
| 721 | |
| 722 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
| 723 | |
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724 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
| 2294 | 725 if (burst <= 0) { |
| 726 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 727 "invalid burst rate \"%V\"", &value[i]); | |
| 728 return NGX_CONF_ERROR; | |
| 729 } | |
| 730 | |
| 731 continue; | |
| 732 } | |
| 733 | |
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734 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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735 lrcf->nodelay = 1; |
| 2294 | 736 continue; |
| 737 } | |
| 738 | |
| 739 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 740 "invalid parameter \"%V\"", &value[i]); | |
| 980 | 741 return NGX_CONF_ERROR; |
| 742 } | |
| 743 | |
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744 if (lrcf->shm_zone == NULL) { |
| 980 | 745 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 746 "\"%V\" must have \"zone\" parameter", |
| 747 &cmd->name); | |
| 980 | 748 return NGX_CONF_ERROR; |
| 749 } | |
| 750 | |
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751 if (lrcf->shm_zone->data == NULL) { |
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752 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 753 "unknown limit_req_zone \"%V\"", |
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754 &lrcf->shm_zone->shm.name); |
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755 return NGX_CONF_ERROR; |
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756 } |
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757 |
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758 lrcf->burst = burst * 1000; |
| 980 | 759 |
| 760 return NGX_CONF_OK; | |
| 761 } | |
| 762 | |
| 763 | |
| 764 static ngx_int_t | |
| 2294 | 765 ngx_http_limit_req_init(ngx_conf_t *cf) |
| 980 | 766 { |
| 767 ngx_http_handler_pt *h; | |
| 768 ngx_http_core_main_conf_t *cmcf; | |
| 769 | |
| 770 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 771 | |
| 772 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 773 if (h == NULL) { | |
| 774 return NGX_ERROR; | |
| 775 } | |
| 776 | |
| 2294 | 777 *h = ngx_http_limit_req_handler; |
| 980 | 778 |
| 779 return NGX_OK; | |
| 780 } |