Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 4467:85a1570ce960
Removed r->cache/r->cached dependencies in range filter.
This is a layering violation, use correct offset calculations instead.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 13 Feb 2012 15:20:49 +0000 |
parents | aacd7356c197 |
children | 95ab6658654a |
rev | line source |
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980 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
980 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
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14 u_char color; |
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15 u_char dummy; |
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16 u_short len; |
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17 ngx_queue_t queue; |
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18 ngx_msec_t last; |
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19 /* integer value, 1 corresponds to 0.001 r/s */ |
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20 ngx_uint_t excess; |
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21 ngx_uint_t count; |
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22 u_char data[1]; |
2294 | 23 } ngx_http_limit_req_node_t; |
980 | 24 |
25 | |
26 typedef struct { | |
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27 ngx_rbtree_t rbtree; |
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28 ngx_rbtree_node_t sentinel; |
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29 ngx_queue_t queue; |
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30 } ngx_http_limit_req_shctx_t; |
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31 |
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32 |
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33 typedef struct { |
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34 ngx_http_limit_req_shctx_t *sh; |
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35 ngx_slab_pool_t *shpool; |
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36 /* integer value, 1 corresponds to 0.001 r/s */ |
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37 ngx_uint_t rate; |
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38 ngx_int_t index; |
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39 ngx_str_t var; |
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40 ngx_http_limit_req_node_t *node; |
2294 | 41 } ngx_http_limit_req_ctx_t; |
987 | 42 |
43 | |
44 typedef struct { | |
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45 ngx_shm_zone_t *shm_zone; |
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46 /* integer value, 1 corresponds to 0.001 r/s */ |
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47 ngx_uint_t burst; |
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48 ngx_uint_t nodelay; /* unsigned nodelay:1 */ |
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49 } ngx_http_limit_req_limit_t; |
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50 |
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51 |
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52 typedef struct { |
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53 ngx_array_t limits; |
3185 | 54 ngx_uint_t limit_log_level; |
55 ngx_uint_t delay_log_level; | |
2294 | 56 } ngx_http_limit_req_conf_t; |
980 | 57 |
58 | |
2294 | 59 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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60 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, |
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61 ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep, |
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62 ngx_uint_t account); |
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63 static ngx_msec_t ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, |
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64 ngx_uint_t n, ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit); |
2294 | 65 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
66 ngx_uint_t n); | |
980 | 67 |
2294 | 68 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
69 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
980 | 70 void *child); |
2294 | 71 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
980 | 72 void *conf); |
2294 | 73 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
980 | 74 void *conf); |
2294 | 75 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
980 | 76 |
77 | |
3185 | 78 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = { |
79 { ngx_string("info"), NGX_LOG_INFO }, | |
80 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
81 { ngx_string("warn"), NGX_LOG_WARN }, | |
82 { ngx_string("error"), NGX_LOG_ERR }, | |
83 { ngx_null_string, 0 } | |
84 }; | |
85 | |
86 | |
2294 | 87 static ngx_command_t ngx_http_limit_req_commands[] = { |
980 | 88 |
2294 | 89 { ngx_string("limit_req_zone"), |
987 | 90 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
2294 | 91 ngx_http_limit_req_zone, |
980 | 92 0, |
93 0, | |
94 NULL }, | |
95 | |
2294 | 96 { ngx_string("limit_req"), |
97 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
98 ngx_http_limit_req, | |
980 | 99 NGX_HTTP_LOC_CONF_OFFSET, |
100 0, | |
101 NULL }, | |
102 | |
3185 | 103 { ngx_string("limit_req_log_level"), |
104 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
105 ngx_conf_set_enum_slot, | |
106 NGX_HTTP_LOC_CONF_OFFSET, | |
107 offsetof(ngx_http_limit_req_conf_t, limit_log_level), | |
108 &ngx_http_limit_req_log_levels }, | |
109 | |
980 | 110 ngx_null_command |
111 }; | |
112 | |
113 | |
2294 | 114 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
980 | 115 NULL, /* preconfiguration */ |
2294 | 116 ngx_http_limit_req_init, /* postconfiguration */ |
980 | 117 |
118 NULL, /* create main configuration */ | |
119 NULL, /* init main configuration */ | |
120 | |
121 NULL, /* create server configuration */ | |
122 NULL, /* merge server configuration */ | |
123 | |
2294 | 124 ngx_http_limit_req_create_conf, /* create location configration */ |
125 ngx_http_limit_req_merge_conf /* merge location configration */ | |
980 | 126 }; |
127 | |
128 | |
2294 | 129 ngx_module_t ngx_http_limit_req_module = { |
980 | 130 NGX_MODULE_V1, |
2294 | 131 &ngx_http_limit_req_module_ctx, /* module context */ |
132 ngx_http_limit_req_commands, /* module directives */ | |
980 | 133 NGX_HTTP_MODULE, /* module type */ |
134 NULL, /* init master */ | |
135 NULL, /* init module */ | |
136 NULL, /* init process */ | |
137 NULL, /* init thread */ | |
138 NULL, /* exit thread */ | |
139 NULL, /* exit process */ | |
140 NULL, /* exit master */ | |
141 NGX_MODULE_V1_PADDING | |
142 }; | |
143 | |
144 | |
145 static ngx_int_t | |
2294 | 146 ngx_http_limit_req_handler(ngx_http_request_t *r) |
980 | 147 { |
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148 size_t len; |
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149 uint32_t hash; |
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150 ngx_int_t rc; |
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151 ngx_uint_t n, excess; |
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152 ngx_msec_t delay; |
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153 ngx_http_variable_value_t *vv; |
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154 ngx_http_limit_req_ctx_t *ctx; |
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155 ngx_http_limit_req_conf_t *lrcf; |
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156 ngx_http_limit_req_limit_t *limit, *limits; |
980 | 157 |
2294 | 158 if (r->main->limit_req_set) { |
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159 return NGX_DECLINED; |
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160 } |
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161 |
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162 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
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163 limits = lrcf->limits.elts; |
980 | 164 |
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165 excess = 0; |
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166 |
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167 rc = NGX_DECLINED; |
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168 |
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169 #if (NGX_SUPPRESS_WARN) |
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170 limit = NULL; |
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171 #endif |
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172 |
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173 for (n = 0; n < lrcf->limits.nelts; n++) { |
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174 |
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175 limit = &limits[n]; |
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176 |
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177 ctx = limit->shm_zone->data; |
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178 |
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179 vv = ngx_http_get_indexed_variable(r, ctx->index); |
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180 |
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181 if (vv == NULL || vv->not_found) { |
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182 continue; |
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183 } |
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184 |
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185 len = vv->len; |
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186 |
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187 if (len == 0) { |
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188 continue; |
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189 } |
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190 |
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191 if (len > 65535) { |
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192 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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193 "the value of the \"%V\" variable " |
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194 "is more than 65535 bytes: \"%v\"", |
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195 &ctx->var, vv); |
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196 continue; |
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197 } |
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198 |
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199 hash = ngx_crc32_short(vv->data, len); |
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200 |
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201 ngx_shmtx_lock(&ctx->shpool->mutex); |
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202 |
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203 rc = ngx_http_limit_req_lookup(limit, hash, vv->data, len, &excess, |
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204 (n == lrcf->limits.nelts - 1)); |
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205 |
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206 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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207 |
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208 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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209 "limit_req[%ui]: %i %ui.%03ui", |
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210 n, rc, excess / 1000, excess % 1000); |
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211 |
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212 if (rc != NGX_AGAIN) { |
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213 break; |
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214 } |
980 | 215 } |
216 | |
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217 if (rc == NGX_DECLINED) { |
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218 return NGX_DECLINED; |
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219 } |
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220 |
2294 | 221 r->main->limit_req_set = 1; |
980 | 222 |
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223 if (rc == NGX_BUSY || rc == NGX_ERROR) { |
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224 |
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225 if (rc == NGX_BUSY) { |
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226 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, |
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227 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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228 excess / 1000, excess % 1000, |
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229 &limit->shm_zone->shm.name); |
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230 } |
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231 |
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232 while (n--) { |
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233 ctx = limits[n].shm_zone->data; |
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234 |
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235 if (ctx->node == NULL) { |
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236 continue; |
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237 } |
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238 |
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239 ngx_shmtx_lock(&ctx->shpool->mutex); |
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240 |
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241 ctx->node->count--; |
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242 |
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243 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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244 |
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245 ctx->node = NULL; |
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246 } |
980 | 247 |
248 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
249 } | |
250 | |
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251 /* rc == NGX_AGAIN || rc == NGX_OK */ |
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252 |
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253 if (rc == NGX_AGAIN) { |
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254 excess = 0; |
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255 } |
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256 |
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257 delay = ngx_http_limit_req_account(limits, n, &excess, &limit); |
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258 |
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259 if (!delay) { |
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260 return NGX_DECLINED; |
2294 | 261 } |
262 | |
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263 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, |
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264 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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265 excess / 1000, excess % 1000, &limit->shm_zone->shm.name); |
2294 | 266 |
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267 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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268 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
2294 | 269 } |
270 | |
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271 r->read_event_handler = ngx_http_test_reading; |
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272 r->write_event_handler = ngx_http_limit_req_delay; |
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273 ngx_add_timer(r->connection->write, delay); |
2294 | 274 |
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275 return NGX_AGAIN; |
980 | 276 } |
277 | |
278 | |
279 static void | |
2294 | 280 ngx_http_limit_req_delay(ngx_http_request_t *r) |
281 { | |
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282 ngx_event_t *wev; |
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283 |
2294 | 284 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
2973 | 285 "limit_req delay"); |
2294 | 286 |
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287 wev = r->connection->write; |
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288 |
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289 if (!wev->timedout) { |
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290 |
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291 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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292 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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293 } |
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294 |
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295 return; |
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296 } |
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297 |
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298 wev->timedout = 0; |
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299 |
2294 | 300 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
301 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
302 return; | |
303 } | |
304 | |
305 r->read_event_handler = ngx_http_block_reading; | |
306 r->write_event_handler = ngx_http_core_run_phases; | |
307 | |
308 ngx_http_core_run_phases(r); | |
309 } | |
310 | |
311 | |
312 static void | |
313 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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314 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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315 { |
2294 | 316 ngx_rbtree_node_t **p; |
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317 ngx_http_limit_req_node_t *lrn, *lrnt; |
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318 |
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319 for ( ;; ) { |
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320 |
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321 if (node->key < temp->key) { |
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322 |
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323 p = &temp->left; |
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324 |
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325 } else if (node->key > temp->key) { |
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326 |
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327 p = &temp->right; |
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328 |
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329 } else { /* node->key == temp->key */ |
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330 |
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331 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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332 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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333 |
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334 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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335 ? &temp->left : &temp->right; |
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336 } |
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337 |
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338 if (*p == sentinel) { |
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339 break; |
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340 } |
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341 |
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342 temp = *p; |
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343 } |
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344 |
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345 *p = node; |
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346 node->parent = temp; |
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347 node->left = sentinel; |
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348 node->right = sentinel; |
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349 ngx_rbt_red(node); |
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350 } |
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351 |
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352 |
2294 | 353 static ngx_int_t |
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354 ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, ngx_uint_t hash, |
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355 u_char *data, size_t len, ngx_uint_t *ep, ngx_uint_t account) |
980 | 356 { |
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357 size_t size; |
2313 | 358 ngx_int_t rc, excess; |
2294 | 359 ngx_time_t *tp; |
360 ngx_msec_t now; | |
361 ngx_msec_int_t ms; | |
362 ngx_rbtree_node_t *node, *sentinel; | |
363 ngx_http_limit_req_ctx_t *ctx; | |
2374
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364 ngx_http_limit_req_node_t *lr; |
2294 | 365 |
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366 tp = ngx_timeofday(); |
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367 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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368 |
4420
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369 ctx = limit->shm_zone->data; |
2294 | 370 |
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|
371 node = ctx->sh->rbtree.root; |
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|
372 sentinel = ctx->sh->rbtree.sentinel; |
980 | 373 |
2294 | 374 while (node != sentinel) { |
375 | |
376 if (hash < node->key) { | |
377 node = node->left; | |
378 continue; | |
379 } | |
380 | |
381 if (hash > node->key) { | |
382 node = node->right; | |
383 continue; | |
384 } | |
385 | |
386 /* hash == node->key */ | |
387 | |
388 do { | |
2374
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389 lr = (ngx_http_limit_req_node_t *) &node->color; |
980 | 390 |
2374
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|
391 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
2294 | 392 |
393 if (rc == 0) { | |
3779
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394 ngx_queue_remove(&lr->queue); |
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395 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
2294 | 396 |
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397 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 398 |
2374
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399 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
2294 | 400 |
3191 | 401 if (excess < 0) { |
402 excess = 0; | |
403 } | |
404 | |
3779
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405 *ep = excess; |
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406 |
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407 if ((ngx_uint_t) excess > limit->burst) { |
3183
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make limit_req to conform to the leaky bucket algorithm
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408 return NGX_BUSY; |
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409 } |
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410 |
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411 if (account) { |
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412 lr->excess = excess; |
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413 lr->last = now; |
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414 return NGX_OK; |
2294 | 415 } |
980 | 416 |
4420
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417 lr->count++; |
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418 |
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419 ctx->node = lr; |
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Limit req: support for multiple "limit_req" limits.
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420 |
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Limit req: support for multiple "limit_req" limits.
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|
421 return NGX_AGAIN; |
2294 | 422 } |
423 | |
424 node = (rc < 0) ? node->left : node->right; | |
425 | |
426 } while (node != sentinel && hash == node->key); | |
427 | |
428 break; | |
980 | 429 } |
430 | |
3779
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431 *ep = 0; |
2294 | 432 |
4418
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433 size = offsetof(ngx_rbtree_node_t, color) |
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434 + offsetof(ngx_http_limit_req_node_t, data) |
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435 + len; |
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|
436 |
4419
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Limit req: number of cleanup calls reduced.
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|
437 ngx_http_limit_req_expire(ctx, 1); |
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Limit req: number of cleanup calls reduced.
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|
438 |
4418
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439 node = ngx_slab_alloc_locked(ctx->shpool, size); |
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440 |
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|
441 if (node == NULL) { |
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|
442 ngx_http_limit_req_expire(ctx, 0); |
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|
443 |
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|
444 node = ngx_slab_alloc_locked(ctx->shpool, size); |
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|
445 if (node == NULL) { |
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|
446 return NGX_ERROR; |
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Limit req: allocation and initialization of a new node moved to the lookup
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|
447 } |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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|
448 } |
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Limit req: allocation and initialization of a new node moved to the lookup
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changeset
|
449 |
aac79fc948cc
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|
450 node->key = hash; |
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|
451 |
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|
452 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
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|
453 |
aac79fc948cc
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|
454 lr = (ngx_http_limit_req_node_t *) &node->color; |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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|
455 |
aac79fc948cc
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|
456 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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changeset
|
457 |
aac79fc948cc
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changeset
|
458 lr->len = (u_char) len; |
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Limit req: allocation and initialization of a new node moved to the lookup
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|
459 lr->excess = 0; |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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changeset
|
460 |
aac79fc948cc
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changeset
|
461 ngx_memcpy(lr->data, data, len); |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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changeset
|
462 |
4420
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Limit req: support for multiple "limit_req" limits.
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changeset
|
463 if (account) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
464 lr->last = now; |
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Limit req: support for multiple "limit_req" limits.
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|
465 lr->count = 0; |
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|
466 return NGX_OK; |
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Limit req: support for multiple "limit_req" limits.
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|
467 } |
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Limit req: support for multiple "limit_req" limits.
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changeset
|
468 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
469 lr->last = 0; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
470 lr->count = 1; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
471 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
472 ctx->node = lr; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
473 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
474 return NGX_AGAIN; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
475 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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4419
diff
changeset
|
476 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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4419
diff
changeset
|
477 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
478 static ngx_msec_t |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
479 ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, ngx_uint_t n, |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
480 ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit) |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
481 { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
482 ngx_int_t excess; |
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Limit req: support for multiple "limit_req" limits.
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changeset
|
483 ngx_time_t *tp; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
484 ngx_msec_t now, delay, max_delay; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
485 ngx_msec_int_t ms; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
486 ngx_http_limit_req_ctx_t *ctx; |
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Limit req: support for multiple "limit_req" limits.
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|
487 ngx_http_limit_req_node_t *lr; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
488 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
489 excess = *ep; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
490 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
491 if (excess == 0 || (*limit)->nodelay) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
492 max_delay = 0; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
493 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
494 } else { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
495 ctx = (*limit)->shm_zone->data; |
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Limit req: support for multiple "limit_req" limits.
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changeset
|
496 max_delay = excess * 1000 / ctx->rate; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
497 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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parents:
4419
diff
changeset
|
498 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
499 while (n--) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
500 ctx = limits[n].shm_zone->data; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
501 lr = ctx->node; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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4419
diff
changeset
|
502 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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4419
diff
changeset
|
503 if (lr == NULL) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
504 continue; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
505 } |
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506 |
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507 ngx_shmtx_lock(&ctx->shpool->mutex); |
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508 |
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509 tp = ngx_timeofday(); |
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510 |
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511 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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512 ms = (ngx_msec_int_t) (now - lr->last); |
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513 |
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514 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
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515 |
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516 if (excess < 0) { |
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517 excess = 0; |
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518 } |
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519 |
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520 lr->last = now; |
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521 lr->excess = excess; |
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522 lr->count--; |
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523 |
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524 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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525 |
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526 ctx->node = NULL; |
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527 |
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528 if (limits[n].nodelay) { |
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529 continue; |
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530 } |
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531 |
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532 delay = excess * 1000 / ctx->rate; |
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533 |
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534 if (delay > max_delay) { |
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535 max_delay = delay; |
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536 *ep = excess; |
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537 *limit = &limits[n]; |
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538 } |
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539 } |
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540 |
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541 return max_delay; |
2294 | 542 } |
543 | |
544 | |
545 static void | |
546 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
547 { | |
2313 | 548 ngx_int_t excess; |
2294 | 549 ngx_time_t *tp; |
550 ngx_msec_t now; | |
551 ngx_queue_t *q; | |
552 ngx_msec_int_t ms; | |
553 ngx_rbtree_node_t *node; | |
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554 ngx_http_limit_req_node_t *lr; |
2294 | 555 |
556 tp = ngx_timeofday(); | |
557 | |
558 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
559 | |
560 /* | |
561 * n == 1 deletes one or two zero rate entries | |
562 * n == 0 deletes oldest entry by force | |
563 * and one or two zero rate entries | |
564 */ | |
565 | |
566 while (n < 3) { | |
567 | |
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568 if (ngx_queue_empty(&ctx->sh->queue)) { |
2294 | 569 return; |
570 } | |
571 | |
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572 q = ngx_queue_last(&ctx->sh->queue); |
2294 | 573 |
2374
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574 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
2294 | 575 |
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576 if (lr->count) { |
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577 |
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578 /* |
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579 * There is not much sense in looking further, |
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580 * because we bump nodes on the lookup stage. |
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581 */ |
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582 |
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583 return; |
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584 } |
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585 |
2294 | 586 if (n++ != 0) { |
587 | |
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588 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 589 ms = ngx_abs(ms); |
590 | |
591 if (ms < 60000) { | |
592 return; | |
593 } | |
594 | |
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595 excess = lr->excess - ctx->rate * ms / 1000; |
2294 | 596 |
2313 | 597 if (excess > 0) { |
2294 | 598 return; |
599 } | |
600 } | |
601 | |
602 ngx_queue_remove(q); | |
603 | |
604 node = (ngx_rbtree_node_t *) | |
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605 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
2294 | 606 |
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607 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
2294 | 608 |
609 ngx_slab_free_locked(ctx->shpool, node); | |
610 } | |
980 | 611 } |
612 | |
613 | |
614 static ngx_int_t | |
2294 | 615 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 616 { |
2294 | 617 ngx_http_limit_req_ctx_t *octx = data; |
993
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618 |
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619 size_t len; |
2294 | 620 ngx_http_limit_req_ctx_t *ctx; |
980 | 621 |
993
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622 ctx = shm_zone->data; |
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623 |
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624 if (octx) { |
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625 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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626 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
2294 | 627 "limit_req \"%V\" uses the \"%V\" variable " |
993
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628 "while previously it used the \"%V\" variable", |
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629 &shm_zone->shm.name, &ctx->var, &octx->var); |
993
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630 return NGX_ERROR; |
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631 } |
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632 |
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633 ctx->sh = octx->sh; |
2294 | 634 ctx->shpool = octx->shpool; |
993
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635 |
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636 return NGX_OK; |
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637 } |
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638 |
2294 | 639 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
980 | 640 |
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641 if (shm_zone->shm.exists) { |
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642 ctx->sh = ctx->shpool->data; |
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643 |
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644 return NGX_OK; |
980 | 645 } |
646 | |
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647 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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648 if (ctx->sh == NULL) { |
980 | 649 return NGX_ERROR; |
650 } | |
651 | |
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652 ctx->shpool->data = ctx->sh; |
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653 |
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654 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
2294 | 655 ngx_http_limit_req_rbtree_insert_value); |
656 | |
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657 ngx_queue_init(&ctx->sh->queue); |
980 | 658 |
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659 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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660 |
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661 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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662 if (ctx->shpool->log_ctx == NULL) { |
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663 return NGX_ERROR; |
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664 } |
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665 |
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666 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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667 &shm_zone->shm.name); |
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668 |
980 | 669 return NGX_OK; |
670 } | |
671 | |
672 | |
673 static void * | |
2294 | 674 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
980 | 675 { |
2294 | 676 ngx_http_limit_req_conf_t *conf; |
980 | 677 |
2294 | 678 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
980 | 679 if (conf == NULL) { |
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680 return NULL; |
980 | 681 } |
682 | |
683 /* | |
684 * set by ngx_pcalloc(): | |
685 * | |
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686 * conf->limits.elts = NULL; |
980 | 687 */ |
688 | |
3185 | 689 conf->limit_log_level = NGX_CONF_UNSET_UINT; |
690 | |
980 | 691 return conf; |
692 } | |
693 | |
694 | |
695 static char * | |
2294 | 696 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
980 | 697 { |
2294 | 698 ngx_http_limit_req_conf_t *prev = parent; |
699 ngx_http_limit_req_conf_t *conf = child; | |
980 | 700 |
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701 if (conf->limits.elts == NULL) { |
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702 conf->limits = prev->limits; |
980 | 703 } |
704 | |
3185 | 705 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, |
706 NGX_LOG_ERR); | |
707 | |
708 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ? | |
709 NGX_LOG_INFO : conf->limit_log_level + 1; | |
710 | |
980 | 711 return NGX_CONF_OK; |
712 } | |
713 | |
714 | |
715 static char * | |
2294 | 716 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 717 { |
2294 | 718 u_char *p; |
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719 size_t len; |
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720 ssize_t size; |
2294 | 721 ngx_str_t *value, name, s; |
722 ngx_int_t rate, scale; | |
723 ngx_uint_t i; | |
724 ngx_shm_zone_t *shm_zone; | |
725 ngx_http_limit_req_ctx_t *ctx; | |
980 | 726 |
727 value = cf->args->elts; | |
728 | |
2294 | 729 ctx = NULL; |
730 size = 0; | |
731 rate = 1; | |
732 scale = 1; | |
733 name.len = 0; | |
734 | |
735 for (i = 1; i < cf->args->nelts; i++) { | |
736 | |
737 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
738 | |
739 name.data = value[i].data + 5; | |
740 | |
741 p = (u_char *) ngx_strchr(name.data, ':'); | |
742 | |
4417
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743 if (p == NULL) { |
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744 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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745 "invalid zone size \"%V\"", &value[i]); |
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746 return NGX_CONF_ERROR; |
2294 | 747 } |
748 | |
4417
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749 name.len = p - name.data; |
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750 |
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751 s.data = p + 1; |
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752 s.len = value[i].data + value[i].len - s.data; |
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753 |
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754 size = ngx_parse_size(&s); |
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755 |
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756 if (size == NGX_ERROR) { |
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757 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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758 "invalid zone size \"%V\"", &value[i]); |
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759 return NGX_CONF_ERROR; |
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760 } |
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761 |
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762 if (size < (ssize_t) (8 * ngx_pagesize)) { |
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763 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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764 "zone \"%V\" is too small", &value[i]); |
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765 return NGX_CONF_ERROR; |
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766 } |
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767 |
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|
768 continue; |
2294 | 769 } |
770 | |
771 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
772 | |
773 len = value[i].len; | |
774 p = value[i].data + len - 3; | |
987 | 775 |
2294 | 776 if (ngx_strncmp(p, "r/s", 3) == 0) { |
777 scale = 1; | |
778 len -= 3; | |
779 | |
780 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
781 scale = 60; | |
782 len -= 3; | |
783 } | |
784 | |
785 rate = ngx_atoi(value[i].data + 5, len - 5); | |
786 if (rate <= NGX_ERROR) { | |
787 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
788 "invalid rate \"%V\"", &value[i]); | |
789 return NGX_CONF_ERROR; | |
790 } | |
791 | |
792 continue; | |
793 } | |
794 | |
795 if (value[i].data[0] == '$') { | |
987 | 796 |
2294 | 797 value[i].len--; |
798 value[i].data++; | |
799 | |
800 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
801 if (ctx == NULL) { | |
802 return NGX_CONF_ERROR; | |
803 } | |
804 | |
805 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
806 if (ctx->index == NGX_ERROR) { | |
807 return NGX_CONF_ERROR; | |
808 } | |
809 | |
810 ctx->var = value[i]; | |
811 | |
812 continue; | |
813 } | |
814 | |
815 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
816 "invalid parameter \"%V\"", &value[i]); | |
987 | 817 return NGX_CONF_ERROR; |
818 } | |
819 | |
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820 if (name.len == 0) { |
2294 | 821 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
822 "\"%V\" must have \"zone\" parameter", | |
823 &cmd->name); | |
987 | 824 return NGX_CONF_ERROR; |
825 } | |
826 | |
2294 | 827 if (ctx == NULL) { |
980 | 828 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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829 "no variable is defined for %V \"%V\"", |
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830 &cmd->name, &name); |
980 | 831 return NGX_CONF_ERROR; |
832 } | |
833 | |
2313 | 834 ctx->rate = rate * 1000 / scale; |
980 | 835 |
2294 | 836 shm_zone = ngx_shared_memory_add(cf, &name, size, |
837 &ngx_http_limit_req_module); | |
980 | 838 if (shm_zone == NULL) { |
839 return NGX_CONF_ERROR; | |
840 } | |
841 | |
987 | 842 if (shm_zone->data) { |
843 ctx = shm_zone->data; | |
844 | |
845 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
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diff
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|
846 "%V \"%V\" is already bound to variable \"%V\"", |
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Limit req: error messages fixed.
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|
847 &cmd->name, &name, &ctx->var); |
987 | 848 return NGX_CONF_ERROR; |
849 } | |
850 | |
2294 | 851 shm_zone->init = ngx_http_limit_req_init_zone; |
987 | 852 shm_zone->data = ctx; |
980 | 853 |
854 return NGX_CONF_OK; | |
855 } | |
856 | |
857 | |
858 static char * | |
2294 | 859 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 860 { |
2374
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2313
diff
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|
861 ngx_http_limit_req_conf_t *lrcf = conf; |
980 | 862 |
4420
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863 ngx_int_t burst; |
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864 ngx_str_t *value, s; |
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865 ngx_uint_t i, nodelay; |
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866 ngx_shm_zone_t *shm_zone; |
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867 ngx_http_limit_req_limit_t *limit, *limits; |
980 | 868 |
869 value = cf->args->elts; | |
870 | |
4420
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|
871 shm_zone = NULL; |
2294 | 872 burst = 0; |
4420
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|
873 nodelay = 0; |
2294 | 874 |
875 for (i = 1; i < cf->args->nelts; i++) { | |
876 | |
877 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
878 | |
879 s.len = value[i].len - 5; | |
880 s.data = value[i].data + 5; | |
881 | |
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|
882 shm_zone = ngx_shared_memory_add(cf, &s, 0, |
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Limit req: support for multiple "limit_req" limits.
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|
883 &ngx_http_limit_req_module); |
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|
884 if (shm_zone == NULL) { |
2294 | 885 return NGX_CONF_ERROR; |
886 } | |
887 | |
888 continue; | |
889 } | |
890 | |
891 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
892 | |
2300
159136c9808d
*) correct leaky bucket implementation
Igor Sysoev <igor@sysoev.ru>
parents:
2294
diff
changeset
|
893 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
2294 | 894 if (burst <= 0) { |
895 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
896 "invalid burst rate \"%V\"", &value[i]); | |
897 return NGX_CONF_ERROR; | |
898 } | |
899 | |
900 continue; | |
901 } | |
902 | |
2300
159136c9808d
*) correct leaky bucket implementation
Igor Sysoev <igor@sysoev.ru>
parents:
2294
diff
changeset
|
903 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
4420
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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parents:
4419
diff
changeset
|
904 nodelay = 1; |
2294 | 905 continue; |
906 } | |
907 | |
908 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
909 "invalid parameter \"%V\"", &value[i]); | |
980 | 910 return NGX_CONF_ERROR; |
911 } | |
912 | |
4420
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Limit req: support for multiple "limit_req" limits.
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|
913 if (shm_zone == NULL) { |
980 | 914 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 915 "\"%V\" must have \"zone\" parameter", |
916 &cmd->name); | |
980 | 917 return NGX_CONF_ERROR; |
918 } | |
919 | |
4420
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Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
920 if (shm_zone->data == NULL) { |
1011
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
921 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 922 "unknown limit_req_zone \"%V\"", |
4420
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Limit req: support for multiple "limit_req" limits.
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changeset
|
923 &shm_zone->shm.name); |
1011
19118c44303f
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1002
diff
changeset
|
924 return NGX_CONF_ERROR; |
19118c44303f
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diff
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|
925 } |
19118c44303f
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diff
changeset
|
926 |
4420
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|
927 limits = lrcf->limits.elts; |
9ce48f9eb85b
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4419
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|
928 |
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|
929 if (limits == NULL) { |
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Limit req: support for multiple "limit_req" limits.
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930 if (ngx_array_init(&lrcf->limits, cf->pool, 1, |
9ce48f9eb85b
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diff
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|
931 sizeof(ngx_http_limit_req_limit_t)) |
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4419
diff
changeset
|
932 != NGX_OK) |
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|
933 { |
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|
934 return NGX_CONF_ERROR; |
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Limit req: support for multiple "limit_req" limits.
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|
935 } |
9ce48f9eb85b
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|
936 } |
9ce48f9eb85b
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diff
changeset
|
937 |
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Limit req: support for multiple "limit_req" limits.
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|
938 for (i = 0; i < lrcf->limits.nelts; i++) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
939 if (shm_zone == limits[i].shm_zone) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
940 return "is duplicate"; |
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Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
941 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
942 } |
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4419
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|
943 |
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Limit req: support for multiple "limit_req" limits.
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4419
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|
944 limit = ngx_array_push(&lrcf->limits); |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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|
945 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
946 limit->shm_zone = shm_zone; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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4419
diff
changeset
|
947 limit->burst = burst * 1000; |
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parents:
4419
diff
changeset
|
948 limit->nodelay = nodelay; |
980 | 949 |
950 return NGX_CONF_OK; | |
951 } | |
952 | |
953 | |
954 static ngx_int_t | |
2294 | 955 ngx_http_limit_req_init(ngx_conf_t *cf) |
980 | 956 { |
957 ngx_http_handler_pt *h; | |
958 ngx_http_core_main_conf_t *cmcf; | |
959 | |
960 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
961 | |
962 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
963 if (h == NULL) { | |
964 return NGX_ERROR; | |
965 } | |
966 | |
2294 | 967 *h = ngx_http_limit_req_handler; |
980 | 968 |
969 return NGX_OK; | |
970 } |