Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 5204:a64c8a5da336
PCRE: retain input pattern for all regular expressions.
Previously, input pattern was kept only for regular expressions
with named captures, which resulted in error log entries without
input pattern for PCRE errors that occured while processing
regular expressions without them.
Signed-off-by: Piotr Sikora <piotr@cloudflare.com>
| author | Piotr Sikora <piotr@cloudflare.com> |
|---|---|
| date | Thu, 02 May 2013 03:26:36 -0700 |
| parents | fc595eeb6c54 |
| children | 5483d9e77b32 |
| rev | line source |
|---|---|
| 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; | |
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56 ngx_uint_t status_code; |
| 2294 | 57 } ngx_http_limit_req_conf_t; |
| 980 | 58 |
| 59 | |
| 2294 | 60 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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61 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, |
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62 ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep, |
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63 ngx_uint_t account); |
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64 static ngx_msec_t ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, |
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65 ngx_uint_t n, ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit); |
| 2294 | 66 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
| 67 ngx_uint_t n); | |
| 980 | 68 |
| 2294 | 69 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
| 70 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
| 980 | 71 void *child); |
| 2294 | 72 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 73 void *conf); |
| 2294 | 74 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 75 void *conf); |
| 2294 | 76 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
| 980 | 77 |
| 78 | |
| 3185 | 79 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = { |
| 80 { ngx_string("info"), NGX_LOG_INFO }, | |
| 81 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
| 82 { ngx_string("warn"), NGX_LOG_WARN }, | |
| 83 { ngx_string("error"), NGX_LOG_ERR }, | |
| 84 { ngx_null_string, 0 } | |
| 85 }; | |
| 86 | |
| 87 | |
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88 static ngx_conf_num_bounds_t ngx_http_limit_req_status_bounds = { |
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89 ngx_conf_check_num_bounds, 400, 599 |
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90 }; |
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91 |
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92 |
| 2294 | 93 static ngx_command_t ngx_http_limit_req_commands[] = { |
| 980 | 94 |
| 2294 | 95 { ngx_string("limit_req_zone"), |
| 987 | 96 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
| 2294 | 97 ngx_http_limit_req_zone, |
| 980 | 98 0, |
| 99 0, | |
| 100 NULL }, | |
| 101 | |
| 2294 | 102 { ngx_string("limit_req"), |
| 103 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
| 104 ngx_http_limit_req, | |
| 980 | 105 NGX_HTTP_LOC_CONF_OFFSET, |
| 106 0, | |
| 107 NULL }, | |
| 108 | |
| 3185 | 109 { ngx_string("limit_req_log_level"), |
| 110 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
| 111 ngx_conf_set_enum_slot, | |
| 112 NGX_HTTP_LOC_CONF_OFFSET, | |
| 113 offsetof(ngx_http_limit_req_conf_t, limit_log_level), | |
| 114 &ngx_http_limit_req_log_levels }, | |
| 115 | |
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116 { ngx_string("limit_req_status"), |
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117 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, |
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118 ngx_conf_set_num_slot, |
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119 NGX_HTTP_LOC_CONF_OFFSET, |
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120 offsetof(ngx_http_limit_req_conf_t, status_code), |
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121 &ngx_http_limit_req_status_bounds }, |
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122 |
| 980 | 123 ngx_null_command |
| 124 }; | |
| 125 | |
| 126 | |
| 2294 | 127 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
| 980 | 128 NULL, /* preconfiguration */ |
| 2294 | 129 ngx_http_limit_req_init, /* postconfiguration */ |
| 980 | 130 |
| 131 NULL, /* create main configuration */ | |
| 132 NULL, /* init main configuration */ | |
| 133 | |
| 134 NULL, /* create server configuration */ | |
| 135 NULL, /* merge server configuration */ | |
| 136 | |
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137 ngx_http_limit_req_create_conf, /* create location configuration */ |
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138 ngx_http_limit_req_merge_conf /* merge location configuration */ |
| 980 | 139 }; |
| 140 | |
| 141 | |
| 2294 | 142 ngx_module_t ngx_http_limit_req_module = { |
| 980 | 143 NGX_MODULE_V1, |
| 2294 | 144 &ngx_http_limit_req_module_ctx, /* module context */ |
| 145 ngx_http_limit_req_commands, /* module directives */ | |
| 980 | 146 NGX_HTTP_MODULE, /* module type */ |
| 147 NULL, /* init master */ | |
| 148 NULL, /* init module */ | |
| 149 NULL, /* init process */ | |
| 150 NULL, /* init thread */ | |
| 151 NULL, /* exit thread */ | |
| 152 NULL, /* exit process */ | |
| 153 NULL, /* exit master */ | |
| 154 NGX_MODULE_V1_PADDING | |
| 155 }; | |
| 156 | |
| 157 | |
| 158 static ngx_int_t | |
| 2294 | 159 ngx_http_limit_req_handler(ngx_http_request_t *r) |
| 980 | 160 { |
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161 size_t len; |
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162 uint32_t hash; |
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163 ngx_int_t rc; |
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164 ngx_uint_t n, excess; |
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165 ngx_msec_t delay; |
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166 ngx_http_variable_value_t *vv; |
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167 ngx_http_limit_req_ctx_t *ctx; |
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168 ngx_http_limit_req_conf_t *lrcf; |
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169 ngx_http_limit_req_limit_t *limit, *limits; |
| 980 | 170 |
| 2294 | 171 if (r->main->limit_req_set) { |
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172 return NGX_DECLINED; |
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173 } |
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174 |
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175 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
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176 limits = lrcf->limits.elts; |
| 980 | 177 |
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178 excess = 0; |
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179 |
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180 rc = NGX_DECLINED; |
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181 |
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182 #if (NGX_SUPPRESS_WARN) |
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183 limit = NULL; |
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184 #endif |
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185 |
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186 for (n = 0; n < lrcf->limits.nelts; n++) { |
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187 |
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188 limit = &limits[n]; |
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189 |
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190 ctx = limit->shm_zone->data; |
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191 |
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192 vv = ngx_http_get_indexed_variable(r, ctx->index); |
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193 |
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194 if (vv == NULL || vv->not_found) { |
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195 continue; |
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196 } |
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197 |
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198 len = vv->len; |
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199 |
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200 if (len == 0) { |
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201 continue; |
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202 } |
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203 |
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204 if (len > 65535) { |
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205 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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206 "the value of the \"%V\" variable " |
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207 "is more than 65535 bytes: \"%v\"", |
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208 &ctx->var, vv); |
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209 continue; |
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210 } |
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211 |
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212 hash = ngx_crc32_short(vv->data, len); |
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213 |
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214 ngx_shmtx_lock(&ctx->shpool->mutex); |
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215 |
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216 rc = ngx_http_limit_req_lookup(limit, hash, vv->data, len, &excess, |
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217 (n == lrcf->limits.nelts - 1)); |
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218 |
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219 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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220 |
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221 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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222 "limit_req[%ui]: %i %ui.%03ui", |
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223 n, rc, excess / 1000, excess % 1000); |
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224 |
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225 if (rc != NGX_AGAIN) { |
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226 break; |
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227 } |
| 980 | 228 } |
| 229 | |
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230 if (rc == NGX_DECLINED) { |
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231 return NGX_DECLINED; |
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232 } |
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233 |
| 2294 | 234 r->main->limit_req_set = 1; |
| 980 | 235 |
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236 if (rc == NGX_BUSY || rc == NGX_ERROR) { |
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237 |
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238 if (rc == NGX_BUSY) { |
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239 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, |
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240 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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241 excess / 1000, excess % 1000, |
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242 &limit->shm_zone->shm.name); |
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243 } |
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244 |
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245 while (n--) { |
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246 ctx = limits[n].shm_zone->data; |
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247 |
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248 if (ctx->node == NULL) { |
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249 continue; |
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250 } |
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251 |
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252 ngx_shmtx_lock(&ctx->shpool->mutex); |
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253 |
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254 ctx->node->count--; |
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255 |
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256 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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257 |
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258 ctx->node = NULL; |
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259 } |
| 980 | 260 |
|
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261 return lrcf->status_code; |
| 980 | 262 } |
| 263 | |
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264 /* rc == NGX_AGAIN || rc == NGX_OK */ |
|
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265 |
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266 if (rc == NGX_AGAIN) { |
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267 excess = 0; |
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268 } |
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269 |
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270 delay = ngx_http_limit_req_account(limits, n, &excess, &limit); |
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271 |
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272 if (!delay) { |
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273 return NGX_DECLINED; |
| 2294 | 274 } |
| 275 | |
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276 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, |
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277 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
|
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278 excess / 1000, excess % 1000, &limit->shm_zone->shm.name); |
| 2294 | 279 |
|
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280 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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281 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
| 2294 | 282 } |
| 283 | |
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284 r->read_event_handler = ngx_http_test_reading; |
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285 r->write_event_handler = ngx_http_limit_req_delay; |
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286 ngx_add_timer(r->connection->write, delay); |
| 2294 | 287 |
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288 return NGX_AGAIN; |
| 980 | 289 } |
| 290 | |
| 291 | |
| 292 static void | |
| 2294 | 293 ngx_http_limit_req_delay(ngx_http_request_t *r) |
| 294 { | |
|
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295 ngx_event_t *wev; |
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296 |
| 2294 | 297 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 2973 | 298 "limit_req delay"); |
| 2294 | 299 |
|
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300 wev = r->connection->write; |
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301 |
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302 if (!wev->timedout) { |
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303 |
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304 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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305 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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306 } |
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307 |
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308 return; |
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309 } |
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310 |
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311 wev->timedout = 0; |
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312 |
| 2294 | 313 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
| 314 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| 315 return; | |
| 316 } | |
| 317 | |
| 318 r->read_event_handler = ngx_http_block_reading; | |
| 319 r->write_event_handler = ngx_http_core_run_phases; | |
| 320 | |
| 321 ngx_http_core_run_phases(r); | |
| 322 } | |
| 323 | |
| 324 | |
| 325 static void | |
| 326 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
|
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327 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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328 { |
| 2294 | 329 ngx_rbtree_node_t **p; |
|
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330 ngx_http_limit_req_node_t *lrn, *lrnt; |
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331 |
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332 for ( ;; ) { |
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333 |
|
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334 if (node->key < temp->key) { |
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335 |
|
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336 p = &temp->left; |
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337 |
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338 } else if (node->key > temp->key) { |
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339 |
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340 p = &temp->right; |
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341 |
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342 } else { /* node->key == temp->key */ |
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343 |
|
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344 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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345 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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346 |
|
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347 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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348 ? &temp->left : &temp->right; |
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349 } |
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350 |
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351 if (*p == sentinel) { |
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352 break; |
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353 } |
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354 |
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355 temp = *p; |
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356 } |
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357 |
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358 *p = node; |
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359 node->parent = temp; |
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360 node->left = sentinel; |
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361 node->right = sentinel; |
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362 ngx_rbt_red(node); |
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363 } |
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364 |
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365 |
| 2294 | 366 static ngx_int_t |
|
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367 ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, ngx_uint_t hash, |
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368 u_char *data, size_t len, ngx_uint_t *ep, ngx_uint_t account) |
| 980 | 369 { |
|
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370 size_t size; |
| 2313 | 371 ngx_int_t rc, excess; |
| 2294 | 372 ngx_time_t *tp; |
| 373 ngx_msec_t now; | |
| 374 ngx_msec_int_t ms; | |
| 375 ngx_rbtree_node_t *node, *sentinel; | |
| 376 ngx_http_limit_req_ctx_t *ctx; | |
|
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|
377 ngx_http_limit_req_node_t *lr; |
| 2294 | 378 |
|
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379 tp = ngx_timeofday(); |
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380 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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381 |
|
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|
382 ctx = limit->shm_zone->data; |
| 2294 | 383 |
|
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|
384 node = ctx->sh->rbtree.root; |
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|
385 sentinel = ctx->sh->rbtree.sentinel; |
| 980 | 386 |
| 2294 | 387 while (node != sentinel) { |
| 388 | |
| 389 if (hash < node->key) { | |
| 390 node = node->left; | |
| 391 continue; | |
| 392 } | |
| 393 | |
| 394 if (hash > node->key) { | |
| 395 node = node->right; | |
| 396 continue; | |
| 397 } | |
| 398 | |
| 399 /* hash == node->key */ | |
| 400 | |
|
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|
401 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 2294 | 402 |
|
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|
403 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
| 3191 | 404 |
|
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|
405 if (rc == 0) { |
|
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|
406 ngx_queue_remove(&lr->queue); |
|
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|
407 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
|
3183
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|
408 |
|
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409 ms = (ngx_msec_int_t) (now - lr->last); |
| 980 | 410 |
|
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|
411 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
|
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|
412 |
|
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|
413 if (excess < 0) { |
|
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|
414 excess = 0; |
| 2294 | 415 } |
| 416 | |
|
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|
417 *ep = excess; |
|
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|
418 |
|
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|
419 if ((ngx_uint_t) excess > limit->burst) { |
|
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|
420 return NGX_BUSY; |
|
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|
421 } |
| 2294 | 422 |
|
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|
423 if (account) { |
|
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|
424 lr->excess = excess; |
|
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|
425 lr->last = now; |
|
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|
426 return NGX_OK; |
|
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|
427 } |
| 2294 | 428 |
|
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|
429 lr->count++; |
|
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|
430 |
|
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|
431 ctx->node = lr; |
|
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|
432 |
|
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|
433 return NGX_AGAIN; |
|
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|
434 } |
|
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changeset
|
435 |
|
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|
436 node = (rc < 0) ? node->left : node->right; |
| 980 | 437 } |
| 438 | |
|
3779
57aecfdcac3d
an excess was logged as 0.000 if requests were limited without delay:
Igor Sysoev <igor@sysoev.ru>
parents:
3525
diff
changeset
|
439 *ep = 0; |
| 2294 | 440 |
|
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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parents:
4417
diff
changeset
|
441 size = offsetof(ngx_rbtree_node_t, color) |
|
aac79fc948cc
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parents:
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changeset
|
442 + offsetof(ngx_http_limit_req_node_t, data) |
|
aac79fc948cc
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changeset
|
443 + len; |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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parents:
4417
diff
changeset
|
444 |
|
4419
7084faa7a4b4
Limit req: number of cleanup calls reduced.
Valentin Bartenev <vbart@nginx.com>
parents:
4418
diff
changeset
|
445 ngx_http_limit_req_expire(ctx, 1); |
|
7084faa7a4b4
Limit req: number of cleanup calls reduced.
Valentin Bartenev <vbart@nginx.com>
parents:
4418
diff
changeset
|
446 |
|
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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parents:
4417
diff
changeset
|
447 node = ngx_slab_alloc_locked(ctx->shpool, size); |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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4417
diff
changeset
|
448 |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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4417
diff
changeset
|
449 if (node == NULL) { |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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4417
diff
changeset
|
450 ngx_http_limit_req_expire(ctx, 0); |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
451 |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
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4417
diff
changeset
|
452 node = ngx_slab_alloc_locked(ctx->shpool, size); |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
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parents:
4417
diff
changeset
|
453 if (node == NULL) { |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
454 return NGX_ERROR; |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
455 } |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
456 } |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
457 |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
458 node->key = hash; |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
459 |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
460 lr = (ngx_http_limit_req_node_t *) &node->color; |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
461 |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
462 lr->len = (u_char) len; |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
463 lr->excess = 0; |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
464 |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
465 ngx_memcpy(lr->data, data, len); |
|
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
466 |
|
4832
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
467 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
|
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
468 |
|
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
469 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
|
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
470 |
|
4420
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
471 if (account) { |
|
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
472 lr->last = now; |
|
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
473 lr->count = 0; |
|
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
474 return NGX_OK; |
|
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
475 } |
|
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476 |
|
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477 lr->last = 0; |
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478 lr->count = 1; |
|
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479 |
|
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480 ctx->node = lr; |
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481 |
|
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482 return NGX_AGAIN; |
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483 } |
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|
484 |
|
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|
485 |
|
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486 static ngx_msec_t |
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487 ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, ngx_uint_t n, |
|
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488 ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit) |
|
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489 { |
|
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490 ngx_int_t excess; |
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491 ngx_time_t *tp; |
|
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492 ngx_msec_t now, delay, max_delay; |
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493 ngx_msec_int_t ms; |
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494 ngx_http_limit_req_ctx_t *ctx; |
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495 ngx_http_limit_req_node_t *lr; |
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496 |
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497 excess = *ep; |
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|
498 |
|
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499 if (excess == 0 || (*limit)->nodelay) { |
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500 max_delay = 0; |
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501 |
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502 } else { |
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503 ctx = (*limit)->shm_zone->data; |
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504 max_delay = excess * 1000 / ctx->rate; |
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505 } |
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|
506 |
|
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507 while (n--) { |
|
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508 ctx = limits[n].shm_zone->data; |
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509 lr = ctx->node; |
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|
510 |
|
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511 if (lr == NULL) { |
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512 continue; |
|
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513 } |
|
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|
514 |
|
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515 ngx_shmtx_lock(&ctx->shpool->mutex); |
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|
516 |
|
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517 tp = ngx_timeofday(); |
|
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518 |
|
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519 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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520 ms = (ngx_msec_int_t) (now - lr->last); |
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521 |
|
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522 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
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523 |
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524 if (excess < 0) { |
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525 excess = 0; |
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526 } |
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527 |
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528 lr->last = now; |
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529 lr->excess = excess; |
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530 lr->count--; |
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|
531 |
|
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532 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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|
533 |
|
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|
534 ctx->node = NULL; |
|
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|
535 |
|
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|
536 if (limits[n].nodelay) { |
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|
537 continue; |
|
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|
538 } |
|
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|
539 |
|
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|
540 delay = excess * 1000 / ctx->rate; |
|
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|
541 |
|
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|
542 if (delay > max_delay) { |
|
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|
543 max_delay = delay; |
|
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|
544 *ep = excess; |
|
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|
545 *limit = &limits[n]; |
|
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|
546 } |
|
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|
547 } |
|
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|
548 |
|
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|
549 return max_delay; |
| 2294 | 550 } |
| 551 | |
| 552 | |
| 553 static void | |
| 554 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
| 555 { | |
| 2313 | 556 ngx_int_t excess; |
| 2294 | 557 ngx_time_t *tp; |
| 558 ngx_msec_t now; | |
| 559 ngx_queue_t *q; | |
| 560 ngx_msec_int_t ms; | |
| 561 ngx_rbtree_node_t *node; | |
|
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|
562 ngx_http_limit_req_node_t *lr; |
| 2294 | 563 |
| 564 tp = ngx_timeofday(); | |
| 565 | |
| 566 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
| 567 | |
| 568 /* | |
| 569 * n == 1 deletes one or two zero rate entries | |
| 570 * n == 0 deletes oldest entry by force | |
| 571 * and one or two zero rate entries | |
| 572 */ | |
| 573 | |
| 574 while (n < 3) { | |
| 575 | |
|
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576 if (ngx_queue_empty(&ctx->sh->queue)) { |
| 2294 | 577 return; |
| 578 } | |
| 579 | |
|
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580 q = ngx_queue_last(&ctx->sh->queue); |
| 2294 | 581 |
|
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|
582 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
| 2294 | 583 |
|
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|
584 if (lr->count) { |
|
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|
585 |
|
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|
586 /* |
|
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|
587 * There is not much sense in looking further, |
|
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|
588 * because we bump nodes on the lookup stage. |
|
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|
589 */ |
|
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|
590 |
|
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|
591 return; |
|
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|
592 } |
|
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|
593 |
| 2294 | 594 if (n++ != 0) { |
| 595 | |
|
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|
596 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 597 ms = ngx_abs(ms); |
| 598 | |
| 599 if (ms < 60000) { | |
| 600 return; | |
| 601 } | |
| 602 | |
|
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|
603 excess = lr->excess - ctx->rate * ms / 1000; |
| 2294 | 604 |
| 2313 | 605 if (excess > 0) { |
| 2294 | 606 return; |
| 607 } | |
| 608 } | |
| 609 | |
| 610 ngx_queue_remove(q); | |
| 611 | |
| 612 node = (ngx_rbtree_node_t *) | |
|
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|
613 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
| 2294 | 614 |
|
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|
615 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
| 2294 | 616 |
| 617 ngx_slab_free_locked(ctx->shpool, node); | |
| 618 } | |
| 980 | 619 } |
| 620 | |
| 621 | |
| 622 static ngx_int_t | |
| 2294 | 623 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 624 { |
| 2294 | 625 ngx_http_limit_req_ctx_t *octx = data; |
|
993
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changeset
|
626 |
|
2611
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improve ngx_slab_alloc() error logging
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diff
changeset
|
627 size_t len; |
| 2294 | 628 ngx_http_limit_req_ctx_t *ctx; |
| 980 | 629 |
|
993
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|
630 ctx = shm_zone->data; |
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|
631 |
|
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changeset
|
632 if (octx) { |
|
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diff
changeset
|
633 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
|
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changeset
|
634 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 2294 | 635 "limit_req \"%V\" uses the \"%V\" variable " |
|
993
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|
636 "while previously it used the \"%V\" variable", |
|
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637 &shm_zone->shm.name, &ctx->var, &octx->var); |
|
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638 return NGX_ERROR; |
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639 } |
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640 |
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641 ctx->sh = octx->sh; |
| 2294 | 642 ctx->shpool = octx->shpool; |
|
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643 |
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644 return NGX_OK; |
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645 } |
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646 |
| 2294 | 647 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 980 | 648 |
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649 if (shm_zone->shm.exists) { |
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650 ctx->sh = ctx->shpool->data; |
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651 |
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652 return NGX_OK; |
| 980 | 653 } |
| 654 | |
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655 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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656 if (ctx->sh == NULL) { |
| 980 | 657 return NGX_ERROR; |
| 658 } | |
| 659 | |
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660 ctx->shpool->data = ctx->sh; |
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661 |
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662 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
| 2294 | 663 ngx_http_limit_req_rbtree_insert_value); |
| 664 | |
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665 ngx_queue_init(&ctx->sh->queue); |
| 980 | 666 |
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667 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
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668 |
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669 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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670 if (ctx->shpool->log_ctx == NULL) { |
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671 return NGX_ERROR; |
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672 } |
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673 |
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674 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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675 &shm_zone->shm.name); |
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676 |
| 980 | 677 return NGX_OK; |
| 678 } | |
| 679 | |
| 680 | |
| 681 static void * | |
| 2294 | 682 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
| 980 | 683 { |
| 2294 | 684 ngx_http_limit_req_conf_t *conf; |
| 980 | 685 |
| 2294 | 686 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
| 980 | 687 if (conf == NULL) { |
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688 return NULL; |
| 980 | 689 } |
| 690 | |
| 691 /* | |
| 692 * set by ngx_pcalloc(): | |
| 693 * | |
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694 * conf->limits.elts = NULL; |
| 980 | 695 */ |
| 696 | |
| 3185 | 697 conf->limit_log_level = NGX_CONF_UNSET_UINT; |
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698 conf->status_code = NGX_CONF_UNSET_UINT; |
| 3185 | 699 |
| 980 | 700 return conf; |
| 701 } | |
| 702 | |
| 703 | |
| 704 static char * | |
| 2294 | 705 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
| 980 | 706 { |
| 2294 | 707 ngx_http_limit_req_conf_t *prev = parent; |
| 708 ngx_http_limit_req_conf_t *conf = child; | |
| 980 | 709 |
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710 if (conf->limits.elts == NULL) { |
|
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|
711 conf->limits = prev->limits; |
| 980 | 712 } |
| 713 | |
| 3185 | 714 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, |
| 715 NGX_LOG_ERR); | |
| 716 | |
| 717 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ? | |
| 718 NGX_LOG_INFO : conf->limit_log_level + 1; | |
| 719 | |
|
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720 ngx_conf_merge_uint_value(conf->status_code, prev->status_code, |
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721 NGX_HTTP_SERVICE_UNAVAILABLE); |
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722 |
| 980 | 723 return NGX_CONF_OK; |
| 724 } | |
| 725 | |
| 726 | |
| 727 static char * | |
| 2294 | 728 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 729 { |
| 2294 | 730 u_char *p; |
|
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Limit req: improved error handling when parsing "zone" parameter of
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|
731 size_t len; |
|
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Limit req: improved error handling when parsing "zone" parameter of
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diff
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|
732 ssize_t size; |
| 2294 | 733 ngx_str_t *value, name, s; |
| 734 ngx_int_t rate, scale; | |
| 735 ngx_uint_t i; | |
| 736 ngx_shm_zone_t *shm_zone; | |
| 737 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 738 |
| 739 value = cf->args->elts; | |
| 740 | |
| 2294 | 741 ctx = NULL; |
| 742 size = 0; | |
| 743 rate = 1; | |
| 744 scale = 1; | |
| 745 name.len = 0; | |
| 746 | |
| 747 for (i = 1; i < cf->args->nelts; i++) { | |
| 748 | |
| 749 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 750 | |
| 751 name.data = value[i].data + 5; | |
| 752 | |
| 753 p = (u_char *) ngx_strchr(name.data, ':'); | |
| 754 | |
|
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|
755 if (p == NULL) { |
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|
756 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
|
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|
757 "invalid zone size \"%V\"", &value[i]); |
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|
758 return NGX_CONF_ERROR; |
| 2294 | 759 } |
| 760 | |
|
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761 name.len = p - name.data; |
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|
762 |
|
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763 s.data = p + 1; |
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|
764 s.len = value[i].data + value[i].len - s.data; |
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|
765 |
|
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|
766 size = ngx_parse_size(&s); |
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|
767 |
|
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|
768 if (size == NGX_ERROR) { |
|
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|
769 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
|
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|
770 "invalid zone size \"%V\"", &value[i]); |
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|
771 return NGX_CONF_ERROR; |
|
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|
772 } |
|
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|
773 |
|
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changeset
|
774 if (size < (ssize_t) (8 * ngx_pagesize)) { |
|
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|
775 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
|
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|
776 "zone \"%V\" is too small", &value[i]); |
|
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|
777 return NGX_CONF_ERROR; |
|
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|
778 } |
|
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|
779 |
|
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diff
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|
780 continue; |
| 2294 | 781 } |
| 782 | |
| 783 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
| 784 | |
| 785 len = value[i].len; | |
| 786 p = value[i].data + len - 3; | |
| 987 | 787 |
| 2294 | 788 if (ngx_strncmp(p, "r/s", 3) == 0) { |
| 789 scale = 1; | |
| 790 len -= 3; | |
| 791 | |
| 792 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
| 793 scale = 60; | |
| 794 len -= 3; | |
| 795 } | |
| 796 | |
| 797 rate = ngx_atoi(value[i].data + 5, len - 5); | |
|
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Limit req: rate should be non-zero.
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diff
changeset
|
798 if (rate <= 0) { |
| 2294 | 799 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 800 "invalid rate \"%V\"", &value[i]); | |
| 801 return NGX_CONF_ERROR; | |
| 802 } | |
| 803 | |
| 804 continue; | |
| 805 } | |
| 806 | |
| 807 if (value[i].data[0] == '$') { | |
| 987 | 808 |
| 2294 | 809 value[i].len--; |
| 810 value[i].data++; | |
| 811 | |
| 812 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
| 813 if (ctx == NULL) { | |
| 814 return NGX_CONF_ERROR; | |
| 815 } | |
| 816 | |
| 817 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
| 818 if (ctx->index == NGX_ERROR) { | |
| 819 return NGX_CONF_ERROR; | |
| 820 } | |
| 821 | |
| 822 ctx->var = value[i]; | |
| 823 | |
| 824 continue; | |
| 825 } | |
| 826 | |
| 827 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 828 "invalid parameter \"%V\"", &value[i]); | |
| 987 | 829 return NGX_CONF_ERROR; |
| 830 } | |
| 831 | |
|
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|
832 if (name.len == 0) { |
| 2294 | 833 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 834 "\"%V\" must have \"zone\" parameter", | |
| 835 &cmd->name); | |
| 987 | 836 return NGX_CONF_ERROR; |
| 837 } | |
| 838 | |
| 2294 | 839 if (ctx == NULL) { |
| 980 | 840 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
|
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Limit req: error messages fixed.
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changeset
|
841 "no variable is defined for %V \"%V\"", |
|
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Limit req: error messages fixed.
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diff
changeset
|
842 &cmd->name, &name); |
| 980 | 843 return NGX_CONF_ERROR; |
| 844 } | |
| 845 | |
| 2313 | 846 ctx->rate = rate * 1000 / scale; |
| 980 | 847 |
| 2294 | 848 shm_zone = ngx_shared_memory_add(cf, &name, size, |
| 849 &ngx_http_limit_req_module); | |
| 980 | 850 if (shm_zone == NULL) { |
| 851 return NGX_CONF_ERROR; | |
| 852 } | |
| 853 | |
| 987 | 854 if (shm_zone->data) { |
| 855 ctx = shm_zone->data; | |
| 856 | |
| 857 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
|
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|
858 "%V \"%V\" is already bound to variable \"%V\"", |
|
8156a9bfc044
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|
859 &cmd->name, &name, &ctx->var); |
| 987 | 860 return NGX_CONF_ERROR; |
| 861 } | |
| 862 | |
| 2294 | 863 shm_zone->init = ngx_http_limit_req_init_zone; |
| 987 | 864 shm_zone->data = ctx; |
| 980 | 865 |
| 866 return NGX_CONF_OK; | |
| 867 } | |
| 868 | |
| 869 | |
| 870 static char * | |
| 2294 | 871 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 872 { |
|
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7b11f9a1bfe1
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2313
diff
changeset
|
873 ngx_http_limit_req_conf_t *lrcf = conf; |
| 980 | 874 |
|
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Limit req: support for multiple "limit_req" limits.
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|
875 ngx_int_t burst; |
|
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|
876 ngx_str_t *value, s; |
|
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|
877 ngx_uint_t i, nodelay; |
|
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|
878 ngx_shm_zone_t *shm_zone; |
|
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879 ngx_http_limit_req_limit_t *limit, *limits; |
| 980 | 880 |
| 881 value = cf->args->elts; | |
| 882 | |
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883 shm_zone = NULL; |
| 2294 | 884 burst = 0; |
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885 nodelay = 0; |
| 2294 | 886 |
| 887 for (i = 1; i < cf->args->nelts; i++) { | |
| 888 | |
| 889 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 890 | |
| 891 s.len = value[i].len - 5; | |
| 892 s.data = value[i].data + 5; | |
| 893 | |
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894 shm_zone = ngx_shared_memory_add(cf, &s, 0, |
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895 &ngx_http_limit_req_module); |
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896 if (shm_zone == NULL) { |
| 2294 | 897 return NGX_CONF_ERROR; |
| 898 } | |
| 899 | |
| 900 continue; | |
| 901 } | |
| 902 | |
| 903 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
| 904 | |
|
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905 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
| 2294 | 906 if (burst <= 0) { |
| 907 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 908 "invalid burst rate \"%V\"", &value[i]); | |
| 909 return NGX_CONF_ERROR; | |
| 910 } | |
| 911 | |
| 912 continue; | |
| 913 } | |
| 914 | |
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915 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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916 nodelay = 1; |
| 2294 | 917 continue; |
| 918 } | |
| 919 | |
| 920 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 921 "invalid parameter \"%V\"", &value[i]); | |
| 980 | 922 return NGX_CONF_ERROR; |
| 923 } | |
| 924 | |
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925 if (shm_zone == NULL) { |
| 980 | 926 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 927 "\"%V\" must have \"zone\" parameter", |
| 928 &cmd->name); | |
| 980 | 929 return NGX_CONF_ERROR; |
| 930 } | |
| 931 | |
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932 if (shm_zone->data == NULL) { |
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933 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 934 "unknown limit_req_zone \"%V\"", |
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935 &shm_zone->shm.name); |
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936 return NGX_CONF_ERROR; |
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937 } |
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938 |
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939 limits = lrcf->limits.elts; |
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940 |
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941 if (limits == NULL) { |
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942 if (ngx_array_init(&lrcf->limits, cf->pool, 1, |
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943 sizeof(ngx_http_limit_req_limit_t)) |
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944 != NGX_OK) |
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945 { |
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946 return NGX_CONF_ERROR; |
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947 } |
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948 } |
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949 |
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950 for (i = 0; i < lrcf->limits.nelts; i++) { |
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951 if (shm_zone == limits[i].shm_zone) { |
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952 return "is duplicate"; |
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953 } |
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954 } |
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955 |
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956 limit = ngx_array_push(&lrcf->limits); |
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957 if (limit == NULL) { |
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958 return NGX_CONF_ERROR; |
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959 } |
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960 |
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|
961 limit->shm_zone = shm_zone; |
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962 limit->burst = burst * 1000; |
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963 limit->nodelay = nodelay; |
| 980 | 964 |
| 965 return NGX_CONF_OK; | |
| 966 } | |
| 967 | |
| 968 | |
| 969 static ngx_int_t | |
| 2294 | 970 ngx_http_limit_req_init(ngx_conf_t *cf) |
| 980 | 971 { |
| 972 ngx_http_handler_pt *h; | |
| 973 ngx_http_core_main_conf_t *cmcf; | |
| 974 | |
| 975 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 976 | |
| 977 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 978 if (h == NULL) { | |
| 979 return NGX_ERROR; | |
| 980 } | |
| 981 | |
| 2294 | 982 *h = ngx_http_limit_req_handler; |
| 980 | 983 |
| 984 return NGX_OK; | |
| 985 } |