Mercurial > hg > nginx
annotate src/http/modules/ngx_http_split_clients_module.c @ 4450:4919fb357a5d stable-1.0
Merge of r4406, r4413: copyrights updated.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Sun, 05 Feb 2012 20:02:59 +0000 |
| parents | eccd0b66a4ab |
| children | ae63013cbffa |
| rev | line source |
|---|---|
| 3513 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
|
4450
4919fb357a5d
Merge of r4406, r4413: copyrights updated.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3918
diff
changeset
|
4 * Copyright (C) Nginx, Inc. |
| 3513 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_http.h> | |
| 11 | |
| 12 | |
| 13 typedef struct { | |
| 14 uint32_t percent; | |
| 15 ngx_http_variable_value_t value; | |
| 16 } ngx_http_split_clients_part_t; | |
| 17 | |
| 18 | |
| 19 typedef struct { | |
| 20 ngx_http_complex_value_t value; | |
| 21 ngx_array_t parts; | |
| 22 } ngx_http_split_clients_ctx_t; | |
| 23 | |
| 24 | |
| 25 static char *ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 26 void *conf); | |
| 27 static char *ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, | |
| 28 void *conf); | |
| 29 | |
| 30 static ngx_command_t ngx_http_split_clients_commands[] = { | |
| 31 | |
| 32 { ngx_string("split_clients"), | |
| 33 NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2, | |
| 34 ngx_conf_split_clients_block, | |
| 35 NGX_HTTP_MAIN_CONF_OFFSET, | |
| 36 0, | |
| 37 NULL }, | |
| 38 | |
| 39 ngx_null_command | |
| 40 }; | |
| 41 | |
| 42 | |
| 43 static ngx_http_module_t ngx_http_split_clients_module_ctx = { | |
| 44 NULL, /* preconfiguration */ | |
| 45 NULL, /* postconfiguration */ | |
| 46 | |
| 47 NULL, /* create main configuration */ | |
| 48 NULL, /* init main configuration */ | |
| 49 | |
| 50 NULL, /* create server configuration */ | |
| 51 NULL, /* merge server configuration */ | |
| 52 | |
| 53 NULL, /* create location configuration */ | |
| 54 NULL /* merge location configuration */ | |
| 55 }; | |
| 56 | |
| 57 | |
| 58 ngx_module_t ngx_http_split_clients_module = { | |
| 59 NGX_MODULE_V1, | |
| 60 &ngx_http_split_clients_module_ctx, /* module context */ | |
| 61 ngx_http_split_clients_commands, /* module directives */ | |
| 62 NGX_HTTP_MODULE, /* module type */ | |
| 63 NULL, /* init master */ | |
| 64 NULL, /* init module */ | |
| 65 NULL, /* init process */ | |
| 66 NULL, /* init thread */ | |
| 67 NULL, /* exit thread */ | |
| 68 NULL, /* exit process */ | |
| 69 NULL, /* exit master */ | |
| 70 NGX_MODULE_V1_PADDING | |
| 71 }; | |
| 72 | |
| 73 | |
| 74 static ngx_int_t | |
| 75 ngx_http_split_clients_variable(ngx_http_request_t *r, | |
| 76 ngx_http_variable_value_t *v, uintptr_t data) | |
| 77 { | |
| 78 ngx_http_split_clients_ctx_t *ctx = (ngx_http_split_clients_ctx_t *) data; | |
| 79 | |
| 80 uint32_t hash; | |
| 81 ngx_str_t val; | |
| 82 ngx_uint_t i; | |
| 83 ngx_http_split_clients_part_t *part; | |
| 84 | |
| 85 *v = ngx_http_variable_null_value; | |
| 86 | |
| 87 if (ngx_http_complex_value(r, &ctx->value, &val) != NGX_OK) { | |
| 88 return NGX_OK; | |
| 89 } | |
| 90 | |
|
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use MurmurHash2 for split_clients, because
Igor Sysoev <igor@sysoev.ru>
parents:
3607
diff
changeset
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91 hash = ngx_murmur_hash2(val.data, val.len); |
| 3513 | 92 |
| 93 part = ctx->parts.elts; | |
| 94 | |
| 95 for (i = 0; i < ctx->parts.nelts; i++) { | |
| 96 | |
| 97 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 3918 | 98 "http split: %uD %uD", hash, part[i].percent); |
| 3513 | 99 |
| 100 if (hash < part[i].percent) { | |
| 101 *v = part[i].value; | |
| 102 return NGX_OK; | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 return NGX_OK; | |
| 107 } | |
| 108 | |
| 109 | |
| 110 static char * | |
| 111 ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 112 { | |
| 113 char *rv; | |
| 114 ngx_str_t *value, name; | |
| 115 ngx_uint_t i, sum, last; | |
| 116 ngx_conf_t save; | |
| 117 ngx_http_variable_t *var; | |
| 118 ngx_http_split_clients_ctx_t *ctx; | |
| 119 ngx_http_split_clients_part_t *part; | |
| 120 ngx_http_compile_complex_value_t ccv; | |
| 121 | |
| 122 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_split_clients_ctx_t)); | |
| 123 if (ctx == NULL) { | |
| 124 return NGX_CONF_ERROR; | |
| 125 } | |
| 126 | |
| 127 value = cf->args->elts; | |
| 128 | |
| 129 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); | |
| 130 | |
| 131 ccv.cf = cf; | |
| 132 ccv.value = &value[1]; | |
| 133 ccv.complex_value = &ctx->value; | |
| 134 | |
| 135 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { | |
| 136 return NGX_CONF_ERROR; | |
| 137 } | |
| 138 | |
| 139 name = value[2]; | |
| 140 name.len--; | |
| 141 name.data++; | |
| 142 | |
| 143 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGEABLE); | |
| 144 if (var == NULL) { | |
| 145 return NGX_CONF_ERROR; | |
| 146 } | |
| 147 | |
| 148 var->get_handler = ngx_http_split_clients_variable; | |
| 149 var->data = (uintptr_t) ctx; | |
| 150 | |
| 151 if (ngx_array_init(&ctx->parts, cf->pool, 2, | |
| 152 sizeof(ngx_http_split_clients_part_t)) | |
| 153 != NGX_OK) | |
| 154 { | |
| 155 return NGX_CONF_ERROR; | |
| 156 } | |
| 157 | |
| 158 save = *cf; | |
| 159 cf->ctx = ctx; | |
| 160 cf->handler = ngx_http_split_clients; | |
| 161 cf->handler_conf = conf; | |
| 162 | |
| 163 rv = ngx_conf_parse(cf, NULL); | |
| 164 | |
| 165 *cf = save; | |
| 166 | |
|
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do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
|
167 if (rv != NGX_CONF_OK) { |
|
8bff43217171
do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
|
168 return rv; |
|
8bff43217171
do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
|
169 } |
|
8bff43217171
do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
|
170 |
| 3513 | 171 sum = 0; |
| 172 last = 0; | |
| 173 part = ctx->parts.elts; | |
| 174 | |
| 175 for (i = 0; i < ctx->parts.nelts; i++) { | |
| 176 sum = part[i].percent ? sum + part[i].percent : 10000; | |
| 177 if (sum > 10000) { | |
| 178 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 179 "percent sum is more than 100%%"); | |
| 180 return NGX_CONF_ERROR; | |
| 181 } | |
| 182 | |
| 183 if (part[i].percent) { | |
| 184 part[i].percent = (uint32_t) | |
| 185 (last + 0xffffffff / 10000 * part[i].percent); | |
| 186 } else { | |
| 187 part[i].percent = 0xffffffff; | |
| 188 } | |
| 189 | |
| 190 last = part[i].percent; | |
| 191 } | |
| 192 | |
| 193 return rv; | |
| 194 } | |
| 195 | |
| 196 | |
| 197 static char * | |
| 198 ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, void *conf) | |
| 199 { | |
| 200 ngx_int_t n; | |
| 201 ngx_str_t *value; | |
| 202 ngx_http_split_clients_ctx_t *ctx; | |
| 203 ngx_http_split_clients_part_t *part; | |
| 204 | |
| 205 ctx = cf->ctx; | |
| 206 value = cf->args->elts; | |
| 207 | |
| 208 part = ngx_array_push(&ctx->parts); | |
| 209 if (part == NULL) { | |
| 210 return NGX_CONF_ERROR; | |
| 211 } | |
| 212 | |
| 213 if (value[0].len == 1 && value[0].data[0] == '*') { | |
| 214 part->percent = 0; | |
| 215 | |
| 216 } else { | |
| 217 if (value[0].data[value[0].len - 1] != '%') { | |
| 218 goto invalid; | |
| 219 } | |
| 220 | |
| 221 n = ngx_atofp(value[0].data, value[0].len - 1, 2); | |
| 222 if (n == NGX_ERROR || n == 0) { | |
| 223 goto invalid; | |
| 224 } | |
| 225 | |
| 226 part->percent = (uint32_t) n; | |
| 227 } | |
| 228 | |
| 229 part->value.len = value[1].len; | |
| 230 part->value.valid = 1; | |
| 231 part->value.no_cacheable = 0; | |
| 232 part->value.not_found = 0; | |
| 233 part->value.data = value[1].data; | |
| 234 | |
| 235 return NGX_CONF_OK; | |
| 236 | |
| 237 invalid: | |
| 238 | |
| 239 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 240 "invalid percent value \"%V\"", &value[0]); | |
| 241 return NGX_CONF_ERROR; | |
| 242 } |