Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_limit_req_module.c @ 4420:9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Mon, 30 Jan 2012 10:17:56 +0000 |
parents | 7084faa7a4b4 |
children | aacd7356c197 |
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 for (n = 0; n < lrcf->limits.nelts; n++) { |
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170 |
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171 limit = &limits[n]; |
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172 |
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173 ctx = limit->shm_zone->data; |
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174 |
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175 vv = ngx_http_get_indexed_variable(r, ctx->index); |
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176 |
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177 if (vv == NULL || vv->not_found) { |
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178 continue; |
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179 } |
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180 |
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181 len = vv->len; |
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182 |
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183 if (len == 0) { |
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184 continue; |
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185 } |
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186 |
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187 if (len > 65535) { |
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188 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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189 "the value of the \"%V\" variable " |
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190 "is more than 65535 bytes: \"%v\"", |
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191 &ctx->var, vv); |
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192 continue; |
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193 } |
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194 |
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195 hash = ngx_crc32_short(vv->data, len); |
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196 |
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197 ngx_shmtx_lock(&ctx->shpool->mutex); |
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198 |
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199 rc = ngx_http_limit_req_lookup(limit, hash, vv->data, len, &excess, |
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200 (n == lrcf->limits.nelts - 1)); |
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201 |
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202 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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203 |
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204 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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205 "limit_req[%ui]: %i %ui.%03ui", |
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206 n, rc, excess / 1000, excess % 1000); |
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207 |
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208 if (rc != NGX_AGAIN) { |
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209 break; |
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210 } |
980 | 211 } |
212 | |
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213 if (rc == NGX_DECLINED) { |
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214 return NGX_DECLINED; |
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215 } |
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216 |
2294 | 217 r->main->limit_req_set = 1; |
980 | 218 |
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219 if (rc == NGX_BUSY || rc == NGX_ERROR) { |
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220 |
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221 if (rc == NGX_BUSY) { |
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222 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, |
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223 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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224 excess / 1000, excess % 1000, |
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225 &limit->shm_zone->shm.name); |
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226 } |
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227 |
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228 while (n--) { |
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229 ctx = limits[n].shm_zone->data; |
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230 |
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231 if (ctx->node == NULL) { |
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232 continue; |
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233 } |
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234 |
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235 ngx_shmtx_lock(&ctx->shpool->mutex); |
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236 |
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237 ctx->node->count--; |
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238 |
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239 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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240 |
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241 ctx->node = NULL; |
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242 } |
980 | 243 |
244 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
245 } | |
246 | |
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247 /* rc == NGX_AGAIN || rc == NGX_OK */ |
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248 |
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249 if (rc == NGX_AGAIN) { |
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250 excess = 0; |
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251 } |
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252 |
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253 delay = ngx_http_limit_req_account(limits, n, &excess, &limit); |
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254 |
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255 if (!delay) { |
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256 return NGX_DECLINED; |
2294 | 257 } |
258 | |
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259 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, |
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260 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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261 excess / 1000, excess % 1000, &limit->shm_zone->shm.name); |
2294 | 262 |
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263 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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264 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
2294 | 265 } |
266 | |
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267 r->read_event_handler = ngx_http_test_reading; |
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268 r->write_event_handler = ngx_http_limit_req_delay; |
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269 ngx_add_timer(r->connection->write, delay); |
2294 | 270 |
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271 return NGX_AGAIN; |
980 | 272 } |
273 | |
274 | |
275 static void | |
2294 | 276 ngx_http_limit_req_delay(ngx_http_request_t *r) |
277 { | |
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278 ngx_event_t *wev; |
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279 |
2294 | 280 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
2973 | 281 "limit_req delay"); |
2294 | 282 |
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283 wev = r->connection->write; |
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284 |
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285 if (!wev->timedout) { |
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286 |
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287 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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288 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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289 } |
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290 |
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291 return; |
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292 } |
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293 |
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294 wev->timedout = 0; |
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295 |
2294 | 296 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
297 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
298 return; | |
299 } | |
300 | |
301 r->read_event_handler = ngx_http_block_reading; | |
302 r->write_event_handler = ngx_http_core_run_phases; | |
303 | |
304 ngx_http_core_run_phases(r); | |
305 } | |
306 | |
307 | |
308 static void | |
309 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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310 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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311 { |
2294 | 312 ngx_rbtree_node_t **p; |
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313 ngx_http_limit_req_node_t *lrn, *lrnt; |
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314 |
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315 for ( ;; ) { |
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316 |
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317 if (node->key < temp->key) { |
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318 |
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319 p = &temp->left; |
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320 |
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321 } else if (node->key > temp->key) { |
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322 |
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323 p = &temp->right; |
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324 |
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325 } else { /* node->key == temp->key */ |
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326 |
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327 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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328 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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329 |
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330 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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331 ? &temp->left : &temp->right; |
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332 } |
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333 |
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334 if (*p == sentinel) { |
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335 break; |
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336 } |
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337 |
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338 temp = *p; |
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339 } |
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340 |
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341 *p = node; |
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342 node->parent = temp; |
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343 node->left = sentinel; |
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344 node->right = sentinel; |
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345 ngx_rbt_red(node); |
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346 } |
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347 |
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348 |
2294 | 349 static ngx_int_t |
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350 ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, ngx_uint_t hash, |
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351 u_char *data, size_t len, ngx_uint_t *ep, ngx_uint_t account) |
980 | 352 { |
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353 size_t size; |
2313 | 354 ngx_int_t rc, excess; |
2294 | 355 ngx_time_t *tp; |
356 ngx_msec_t now; | |
357 ngx_msec_int_t ms; | |
358 ngx_rbtree_node_t *node, *sentinel; | |
359 ngx_http_limit_req_ctx_t *ctx; | |
2374
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|
360 ngx_http_limit_req_node_t *lr; |
2294 | 361 |
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362 tp = ngx_timeofday(); |
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363 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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364 |
4420
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365 ctx = limit->shm_zone->data; |
2294 | 366 |
2720
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367 node = ctx->sh->rbtree.root; |
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368 sentinel = ctx->sh->rbtree.sentinel; |
980 | 369 |
2294 | 370 while (node != sentinel) { |
371 | |
372 if (hash < node->key) { | |
373 node = node->left; | |
374 continue; | |
375 } | |
376 | |
377 if (hash > node->key) { | |
378 node = node->right; | |
379 continue; | |
380 } | |
381 | |
382 /* hash == node->key */ | |
383 | |
384 do { | |
2374
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|
385 lr = (ngx_http_limit_req_node_t *) &node->color; |
980 | 386 |
2374
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387 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
2294 | 388 |
389 if (rc == 0) { | |
3779
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390 ngx_queue_remove(&lr->queue); |
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391 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
2294 | 392 |
2374
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393 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 394 |
2374
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395 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
2294 | 396 |
3191 | 397 if (excess < 0) { |
398 excess = 0; | |
399 } | |
400 | |
3779
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401 *ep = excess; |
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402 |
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403 if ((ngx_uint_t) excess > limit->burst) { |
3183
b87542338ac3
make limit_req to conform to the leaky bucket algorithm
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404 return NGX_BUSY; |
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405 } |
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406 |
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407 if (account) { |
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408 lr->excess = excess; |
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409 lr->last = now; |
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410 return NGX_OK; |
2294 | 411 } |
980 | 412 |
4420
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413 lr->count++; |
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Limit req: support for multiple "limit_req" limits.
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414 |
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415 ctx->node = lr; |
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416 |
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417 return NGX_AGAIN; |
2294 | 418 } |
419 | |
420 node = (rc < 0) ? node->left : node->right; | |
421 | |
422 } while (node != sentinel && hash == node->key); | |
423 | |
424 break; | |
980 | 425 } |
426 | |
3779
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427 *ep = 0; |
2294 | 428 |
4418
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429 size = offsetof(ngx_rbtree_node_t, color) |
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430 + offsetof(ngx_http_limit_req_node_t, data) |
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431 + len; |
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432 |
4419
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Limit req: number of cleanup calls reduced.
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|
433 ngx_http_limit_req_expire(ctx, 1); |
7084faa7a4b4
Limit req: number of cleanup calls reduced.
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|
434 |
4418
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435 node = ngx_slab_alloc_locked(ctx->shpool, size); |
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436 |
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437 if (node == NULL) { |
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|
438 ngx_http_limit_req_expire(ctx, 0); |
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|
439 |
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|
440 node = ngx_slab_alloc_locked(ctx->shpool, size); |
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441 if (node == NULL) { |
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442 return NGX_ERROR; |
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|
443 } |
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|
444 } |
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|
445 |
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|
446 node->key = hash; |
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|
447 |
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448 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
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449 |
aac79fc948cc
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|
450 lr = (ngx_http_limit_req_node_t *) &node->color; |
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451 |
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452 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
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|
453 |
aac79fc948cc
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|
454 lr->len = (u_char) len; |
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455 lr->excess = 0; |
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|
456 |
aac79fc948cc
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|
457 ngx_memcpy(lr->data, data, len); |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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|
458 |
4420
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|
459 if (account) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
460 lr->last = now; |
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Limit req: support for multiple "limit_req" limits.
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|
461 lr->count = 0; |
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462 return NGX_OK; |
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Limit req: support for multiple "limit_req" limits.
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|
463 } |
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Limit req: support for multiple "limit_req" limits.
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|
464 |
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|
465 lr->last = 0; |
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|
466 lr->count = 1; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
467 |
9ce48f9eb85b
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|
468 ctx->node = lr; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
469 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
470 return NGX_AGAIN; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
471 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
472 |
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 static ngx_msec_t |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
475 ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, ngx_uint_t n, |
9ce48f9eb85b
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476 ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit) |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
477 { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
478 ngx_int_t excess; |
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|
479 ngx_time_t *tp; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
480 ngx_msec_t now, delay, max_delay; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
481 ngx_msec_int_t ms; |
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|
482 ngx_http_limit_req_ctx_t *ctx; |
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|
483 ngx_http_limit_req_node_t *lr; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
484 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
485 excess = *ep; |
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Limit req: support for multiple "limit_req" limits.
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|
486 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
487 if (excess == 0 || (*limit)->nodelay) { |
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Limit req: support for multiple "limit_req" limits.
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|
488 max_delay = 0; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
489 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
490 } else { |
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Limit req: support for multiple "limit_req" limits.
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|
491 ctx = (*limit)->shm_zone->data; |
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Limit req: support for multiple "limit_req" limits.
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|
492 max_delay = excess * 1000 / ctx->rate; |
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Limit req: support for multiple "limit_req" limits.
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|
493 } |
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Limit req: support for multiple "limit_req" limits.
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|
494 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
495 while (n--) { |
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Limit req: support for multiple "limit_req" limits.
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|
496 ctx = limits[n].shm_zone->data; |
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Limit req: support for multiple "limit_req" limits.
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|
497 lr = ctx->node; |
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Limit req: support for multiple "limit_req" limits.
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changeset
|
498 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
499 if (lr == NULL) { |
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Limit req: support for multiple "limit_req" limits.
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|
500 continue; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
501 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
502 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
503 ngx_shmtx_lock(&ctx->shpool->mutex); |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
504 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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505 tp = ngx_timeofday(); |
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506 |
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507 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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508 ms = (ngx_msec_int_t) (now - lr->last); |
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509 |
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510 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
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511 |
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512 if (excess < 0) { |
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513 excess = 0; |
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514 } |
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515 |
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516 lr->last = now; |
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517 lr->excess = excess; |
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518 lr->count--; |
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519 |
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520 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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521 |
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522 ctx->node = NULL; |
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523 |
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524 if (limits[n].nodelay) { |
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525 continue; |
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526 } |
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527 |
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528 delay = excess * 1000 / ctx->rate; |
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529 |
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530 if (delay > max_delay) { |
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531 max_delay = delay; |
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532 *ep = excess; |
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533 *limit = &limits[n]; |
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534 } |
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535 } |
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536 |
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537 return max_delay; |
2294 | 538 } |
539 | |
540 | |
541 static void | |
542 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
543 { | |
2313 | 544 ngx_int_t excess; |
2294 | 545 ngx_time_t *tp; |
546 ngx_msec_t now; | |
547 ngx_queue_t *q; | |
548 ngx_msec_int_t ms; | |
549 ngx_rbtree_node_t *node; | |
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550 ngx_http_limit_req_node_t *lr; |
2294 | 551 |
552 tp = ngx_timeofday(); | |
553 | |
554 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
555 | |
556 /* | |
557 * n == 1 deletes one or two zero rate entries | |
558 * n == 0 deletes oldest entry by force | |
559 * and one or two zero rate entries | |
560 */ | |
561 | |
562 while (n < 3) { | |
563 | |
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564 if (ngx_queue_empty(&ctx->sh->queue)) { |
2294 | 565 return; |
566 } | |
567 | |
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568 q = ngx_queue_last(&ctx->sh->queue); |
2294 | 569 |
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570 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
2294 | 571 |
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572 if (lr->count) { |
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573 |
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574 /* |
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575 * There is not much sense in looking further, |
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576 * because we bump nodes on the lookup stage. |
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577 */ |
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578 |
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579 return; |
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580 } |
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581 |
2294 | 582 if (n++ != 0) { |
583 | |
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584 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 585 ms = ngx_abs(ms); |
586 | |
587 if (ms < 60000) { | |
588 return; | |
589 } | |
590 | |
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591 excess = lr->excess - ctx->rate * ms / 1000; |
2294 | 592 |
2313 | 593 if (excess > 0) { |
2294 | 594 return; |
595 } | |
596 } | |
597 | |
598 ngx_queue_remove(q); | |
599 | |
600 node = (ngx_rbtree_node_t *) | |
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601 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
2294 | 602 |
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603 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
2294 | 604 |
605 ngx_slab_free_locked(ctx->shpool, node); | |
606 } | |
980 | 607 } |
608 | |
609 | |
610 static ngx_int_t | |
2294 | 611 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 612 { |
2294 | 613 ngx_http_limit_req_ctx_t *octx = data; |
993
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614 |
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615 size_t len; |
2294 | 616 ngx_http_limit_req_ctx_t *ctx; |
980 | 617 |
993
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618 ctx = shm_zone->data; |
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619 |
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620 if (octx) { |
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621 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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622 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
2294 | 623 "limit_req \"%V\" uses the \"%V\" variable " |
993
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624 "while previously it used the \"%V\" variable", |
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625 &shm_zone->shm.name, &ctx->var, &octx->var); |
993
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626 return NGX_ERROR; |
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627 } |
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628 |
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629 ctx->sh = octx->sh; |
2294 | 630 ctx->shpool = octx->shpool; |
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631 |
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632 return NGX_OK; |
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633 } |
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634 |
2294 | 635 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
980 | 636 |
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637 if (shm_zone->shm.exists) { |
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638 ctx->sh = ctx->shpool->data; |
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639 |
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640 return NGX_OK; |
980 | 641 } |
642 | |
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643 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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644 if (ctx->sh == NULL) { |
980 | 645 return NGX_ERROR; |
646 } | |
647 | |
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648 ctx->shpool->data = ctx->sh; |
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649 |
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650 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
2294 | 651 ngx_http_limit_req_rbtree_insert_value); |
652 | |
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653 ngx_queue_init(&ctx->sh->queue); |
980 | 654 |
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655 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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656 |
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657 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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658 if (ctx->shpool->log_ctx == NULL) { |
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659 return NGX_ERROR; |
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660 } |
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661 |
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662 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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663 &shm_zone->shm.name); |
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664 |
980 | 665 return NGX_OK; |
666 } | |
667 | |
668 | |
669 static void * | |
2294 | 670 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
980 | 671 { |
2294 | 672 ngx_http_limit_req_conf_t *conf; |
980 | 673 |
2294 | 674 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
980 | 675 if (conf == NULL) { |
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676 return NULL; |
980 | 677 } |
678 | |
679 /* | |
680 * set by ngx_pcalloc(): | |
681 * | |
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682 * conf->limits.elts = NULL; |
980 | 683 */ |
684 | |
3185 | 685 conf->limit_log_level = NGX_CONF_UNSET_UINT; |
686 | |
980 | 687 return conf; |
688 } | |
689 | |
690 | |
691 static char * | |
2294 | 692 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
980 | 693 { |
2294 | 694 ngx_http_limit_req_conf_t *prev = parent; |
695 ngx_http_limit_req_conf_t *conf = child; | |
980 | 696 |
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697 if (conf->limits.elts == NULL) { |
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698 conf->limits = prev->limits; |
980 | 699 } |
700 | |
3185 | 701 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, |
702 NGX_LOG_ERR); | |
703 | |
704 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ? | |
705 NGX_LOG_INFO : conf->limit_log_level + 1; | |
706 | |
980 | 707 return NGX_CONF_OK; |
708 } | |
709 | |
710 | |
711 static char * | |
2294 | 712 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 713 { |
2294 | 714 u_char *p; |
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715 size_t len; |
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|
716 ssize_t size; |
2294 | 717 ngx_str_t *value, name, s; |
718 ngx_int_t rate, scale; | |
719 ngx_uint_t i; | |
720 ngx_shm_zone_t *shm_zone; | |
721 ngx_http_limit_req_ctx_t *ctx; | |
980 | 722 |
723 value = cf->args->elts; | |
724 | |
2294 | 725 ctx = NULL; |
726 size = 0; | |
727 rate = 1; | |
728 scale = 1; | |
729 name.len = 0; | |
730 | |
731 for (i = 1; i < cf->args->nelts; i++) { | |
732 | |
733 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
734 | |
735 name.data = value[i].data + 5; | |
736 | |
737 p = (u_char *) ngx_strchr(name.data, ':'); | |
738 | |
4417
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Limit req: improved error handling when parsing "zone" parameter of
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diff
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|
739 if (p == NULL) { |
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740 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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741 "invalid zone size \"%V\"", &value[i]); |
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|
742 return NGX_CONF_ERROR; |
2294 | 743 } |
744 | |
4417
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745 name.len = p - name.data; |
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746 |
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747 s.data = p + 1; |
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748 s.len = value[i].data + value[i].len - s.data; |
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749 |
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750 size = ngx_parse_size(&s); |
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751 |
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752 if (size == NGX_ERROR) { |
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753 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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754 "invalid zone size \"%V\"", &value[i]); |
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755 return NGX_CONF_ERROR; |
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|
756 } |
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757 |
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758 if (size < (ssize_t) (8 * ngx_pagesize)) { |
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759 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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Limit req: improved error handling when parsing "zone" parameter of
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changeset
|
760 "zone \"%V\" is too small", &value[i]); |
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|
761 return NGX_CONF_ERROR; |
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762 } |
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Valentin Bartenev <vbart@nginx.com>
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763 |
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Valentin Bartenev <vbart@nginx.com>
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|
764 continue; |
2294 | 765 } |
766 | |
767 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
768 | |
769 len = value[i].len; | |
770 p = value[i].data + len - 3; | |
987 | 771 |
2294 | 772 if (ngx_strncmp(p, "r/s", 3) == 0) { |
773 scale = 1; | |
774 len -= 3; | |
775 | |
776 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
777 scale = 60; | |
778 len -= 3; | |
779 } | |
780 | |
781 rate = ngx_atoi(value[i].data + 5, len - 5); | |
782 if (rate <= NGX_ERROR) { | |
783 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
784 "invalid rate \"%V\"", &value[i]); | |
785 return NGX_CONF_ERROR; | |
786 } | |
787 | |
788 continue; | |
789 } | |
790 | |
791 if (value[i].data[0] == '$') { | |
987 | 792 |
2294 | 793 value[i].len--; |
794 value[i].data++; | |
795 | |
796 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
797 if (ctx == NULL) { | |
798 return NGX_CONF_ERROR; | |
799 } | |
800 | |
801 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
802 if (ctx->index == NGX_ERROR) { | |
803 return NGX_CONF_ERROR; | |
804 } | |
805 | |
806 ctx->var = value[i]; | |
807 | |
808 continue; | |
809 } | |
810 | |
811 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
812 "invalid parameter \"%V\"", &value[i]); | |
987 | 813 return NGX_CONF_ERROR; |
814 } | |
815 | |
4417
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816 if (name.len == 0) { |
2294 | 817 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
818 "\"%V\" must have \"zone\" parameter", | |
819 &cmd->name); | |
987 | 820 return NGX_CONF_ERROR; |
821 } | |
822 | |
2294 | 823 if (ctx == NULL) { |
980 | 824 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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825 "no variable is defined for %V \"%V\"", |
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|
826 &cmd->name, &name); |
980 | 827 return NGX_CONF_ERROR; |
828 } | |
829 | |
2313 | 830 ctx->rate = rate * 1000 / scale; |
980 | 831 |
2294 | 832 shm_zone = ngx_shared_memory_add(cf, &name, size, |
833 &ngx_http_limit_req_module); | |
980 | 834 if (shm_zone == NULL) { |
835 return NGX_CONF_ERROR; | |
836 } | |
837 | |
987 | 838 if (shm_zone->data) { |
839 ctx = shm_zone->data; | |
840 | |
841 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
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842 "%V \"%V\" is already bound to variable \"%V\"", |
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|
843 &cmd->name, &name, &ctx->var); |
987 | 844 return NGX_CONF_ERROR; |
845 } | |
846 | |
2294 | 847 shm_zone->init = ngx_http_limit_req_init_zone; |
987 | 848 shm_zone->data = ctx; |
980 | 849 |
850 return NGX_CONF_OK; | |
851 } | |
852 | |
853 | |
854 static char * | |
2294 | 855 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 856 { |
2374
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|
857 ngx_http_limit_req_conf_t *lrcf = conf; |
980 | 858 |
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859 ngx_int_t burst; |
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|
860 ngx_str_t *value, s; |
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861 ngx_uint_t i, nodelay; |
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862 ngx_shm_zone_t *shm_zone; |
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|
863 ngx_http_limit_req_limit_t *limit, *limits; |
980 | 864 |
865 value = cf->args->elts; | |
866 | |
4420
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|
867 shm_zone = NULL; |
2294 | 868 burst = 0; |
4420
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|
869 nodelay = 0; |
2294 | 870 |
871 for (i = 1; i < cf->args->nelts; i++) { | |
872 | |
873 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
874 | |
875 s.len = value[i].len - 5; | |
876 s.data = value[i].data + 5; | |
877 | |
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|
878 shm_zone = ngx_shared_memory_add(cf, &s, 0, |
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|
879 &ngx_http_limit_req_module); |
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diff
changeset
|
880 if (shm_zone == NULL) { |
2294 | 881 return NGX_CONF_ERROR; |
882 } | |
883 | |
884 continue; | |
885 } | |
886 | |
887 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
888 | |
2300
159136c9808d
*) correct leaky bucket implementation
Igor Sysoev <igor@sysoev.ru>
parents:
2294
diff
changeset
|
889 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
2294 | 890 if (burst <= 0) { |
891 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
892 "invalid burst rate \"%V\"", &value[i]); | |
893 return NGX_CONF_ERROR; | |
894 } | |
895 | |
896 continue; | |
897 } | |
898 | |
2300
159136c9808d
*) correct leaky bucket implementation
Igor Sysoev <igor@sysoev.ru>
parents:
2294
diff
changeset
|
899 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
4420
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Limit req: support for multiple "limit_req" limits.
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diff
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|
900 nodelay = 1; |
2294 | 901 continue; |
902 } | |
903 | |
904 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
905 "invalid parameter \"%V\"", &value[i]); | |
980 | 906 return NGX_CONF_ERROR; |
907 } | |
908 | |
4420
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|
909 if (shm_zone == NULL) { |
980 | 910 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 911 "\"%V\" must have \"zone\" parameter", |
912 &cmd->name); | |
980 | 913 return NGX_CONF_ERROR; |
914 } | |
915 | |
4420
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Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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changeset
|
916 if (shm_zone->data == NULL) { |
1011
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
917 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 918 "unknown limit_req_zone \"%V\"", |
4420
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
919 &shm_zone->shm.name); |
1011
19118c44303f
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Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
920 return NGX_CONF_ERROR; |
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
921 } |
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
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1002
diff
changeset
|
922 |
4420
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Limit req: support for multiple "limit_req" limits.
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|
923 limits = lrcf->limits.elts; |
9ce48f9eb85b
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diff
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|
924 |
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Limit req: support for multiple "limit_req" limits.
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|
925 if (limits == NULL) { |
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|
926 if (ngx_array_init(&lrcf->limits, cf->pool, 1, |
9ce48f9eb85b
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diff
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|
927 sizeof(ngx_http_limit_req_limit_t)) |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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|
928 != NGX_OK) |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
929 { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
930 return NGX_CONF_ERROR; |
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|
931 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
932 } |
9ce48f9eb85b
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|
933 |
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changeset
|
934 for (i = 0; i < lrcf->limits.nelts; i++) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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diff
changeset
|
935 if (shm_zone == limits[i].shm_zone) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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4419
diff
changeset
|
936 return "is duplicate"; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
937 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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parents:
4419
diff
changeset
|
938 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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4419
diff
changeset
|
939 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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4419
diff
changeset
|
940 limit = ngx_array_push(&lrcf->limits); |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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|
941 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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changeset
|
942 limit->shm_zone = shm_zone; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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parents:
4419
diff
changeset
|
943 limit->burst = burst * 1000; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
944 limit->nodelay = nodelay; |
980 | 945 |
946 return NGX_CONF_OK; | |
947 } | |
948 | |
949 | |
950 static ngx_int_t | |
2294 | 951 ngx_http_limit_req_init(ngx_conf_t *cf) |
980 | 952 { |
953 ngx_http_handler_pt *h; | |
954 ngx_http_core_main_conf_t *cmcf; | |
955 | |
956 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
957 | |
958 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
959 if (h == NULL) { | |
960 return NGX_ERROR; | |
961 } | |
962 | |
2294 | 963 *h = ngx_http_limit_req_handler; |
980 | 964 |
965 return NGX_OK; | |
966 } |