Mercurial > hg > nginx
annotate src/stream/ngx_stream_upstream_zone_module.c @ 6694:ea9dfe2f62e7
Stream: preread phase.
In this phase, head of a stream is read and analysed before proceeding to the
content phase. Amount of data read is controlled by the module implementing
the phase, but not more than defined by the "preread_buffer_size" directive.
The time spent on processing preread is controlled by the "preread_timeout"
directive.
The typical preread phase module will parse the beginning of a stream and set
variable that may be used by the content phase, for example to make routing
decision.
| author | Vladimir Homutov <vl@nginx.com> |
|---|---|
| date | Thu, 15 Sep 2016 14:56:02 +0300 |
| parents | 8ed51b02f655 |
| children | 1eb753aa8e5e |
| rev | line source |
|---|---|
| 6115 | 1 |
| 2 /* | |
| 3 * Copyright (C) Ruslan Ermilov | |
| 4 * Copyright (C) Nginx, Inc. | |
| 5 */ | |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_stream.h> | |
| 11 | |
| 12 | |
| 13 static char *ngx_stream_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 14 void *conf); | |
| 15 static ngx_int_t ngx_stream_upstream_init_zone(ngx_shm_zone_t *shm_zone, | |
| 16 void *data); | |
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17 static ngx_stream_upstream_rr_peers_t *ngx_stream_upstream_zone_copy_peers( |
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18 ngx_slab_pool_t *shpool, ngx_stream_upstream_srv_conf_t *uscf); |
| 6115 | 19 |
| 20 | |
| 21 static ngx_command_t ngx_stream_upstream_zone_commands[] = { | |
| 22 | |
| 23 { ngx_string("zone"), | |
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24 NGX_STREAM_UPS_CONF|NGX_CONF_TAKE12, |
| 6115 | 25 ngx_stream_upstream_zone, |
| 26 0, | |
| 27 0, | |
| 28 NULL }, | |
| 29 | |
| 30 ngx_null_command | |
| 31 }; | |
| 32 | |
| 33 | |
| 34 static ngx_stream_module_t ngx_stream_upstream_zone_module_ctx = { | |
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35 NULL, /* preconfiguration */ |
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36 NULL, /* postconfiguration */ |
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37 |
| 6115 | 38 NULL, /* create main configuration */ |
| 39 NULL, /* init main configuration */ | |
| 40 | |
| 41 NULL, /* create server configuration */ | |
| 6629 | 42 NULL /* merge server configuration */ |
| 6115 | 43 }; |
| 44 | |
| 45 | |
| 46 ngx_module_t ngx_stream_upstream_zone_module = { | |
| 47 NGX_MODULE_V1, | |
| 48 &ngx_stream_upstream_zone_module_ctx, /* module context */ | |
| 49 ngx_stream_upstream_zone_commands, /* module directives */ | |
| 50 NGX_STREAM_MODULE, /* module type */ | |
| 51 NULL, /* init master */ | |
| 52 NULL, /* init module */ | |
| 53 NULL, /* init process */ | |
| 54 NULL, /* init thread */ | |
| 55 NULL, /* exit thread */ | |
| 56 NULL, /* exit process */ | |
| 57 NULL, /* exit master */ | |
| 58 NGX_MODULE_V1_PADDING | |
| 59 }; | |
| 60 | |
| 61 | |
| 62 static char * | |
| 63 ngx_stream_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 64 { | |
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65 ssize_t size; |
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66 ngx_str_t *value; |
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67 ngx_stream_upstream_srv_conf_t *uscf; |
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68 ngx_stream_upstream_main_conf_t *umcf; |
| 6115 | 69 |
| 70 uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module); | |
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71 umcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_upstream_module); |
| 6115 | 72 |
| 73 value = cf->args->elts; | |
| 74 | |
| 75 if (!value[1].len) { | |
| 76 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 77 "invalid zone name \"%V\"", &value[1]); | |
| 78 return NGX_CONF_ERROR; | |
| 79 } | |
| 80 | |
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81 if (cf->args->nelts == 3) { |
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82 size = ngx_parse_size(&value[2]); |
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83 |
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84 if (size == NGX_ERROR) { |
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85 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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86 "invalid zone size \"%V\"", &value[2]); |
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87 return NGX_CONF_ERROR; |
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88 } |
| 6115 | 89 |
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90 if (size < (ssize_t) (8 * ngx_pagesize)) { |
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91 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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92 "zone \"%V\" is too small", &value[1]); |
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93 return NGX_CONF_ERROR; |
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94 } |
| 6115 | 95 |
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96 } else { |
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97 size = 0; |
| 6115 | 98 } |
| 99 | |
| 100 uscf->shm_zone = ngx_shared_memory_add(cf, &value[1], size, | |
| 101 &ngx_stream_upstream_module); | |
| 102 if (uscf->shm_zone == NULL) { | |
| 103 return NGX_CONF_ERROR; | |
| 104 } | |
| 105 | |
| 106 uscf->shm_zone->init = ngx_stream_upstream_init_zone; | |
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107 uscf->shm_zone->data = umcf; |
| 6115 | 108 |
| 109 uscf->shm_zone->noreuse = 1; | |
| 110 | |
| 111 return NGX_CONF_OK; | |
| 112 } | |
| 113 | |
| 114 | |
| 115 static ngx_int_t | |
| 116 ngx_stream_upstream_init_zone(ngx_shm_zone_t *shm_zone, void *data) | |
| 117 { | |
| 118 size_t len; | |
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119 ngx_uint_t i; |
| 6115 | 120 ngx_slab_pool_t *shpool; |
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121 ngx_stream_upstream_rr_peers_t *peers, **peersp; |
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122 ngx_stream_upstream_srv_conf_t *uscf, **uscfp; |
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123 ngx_stream_upstream_main_conf_t *umcf; |
| 6115 | 124 |
| 125 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; | |
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126 umcf = shm_zone->data; |
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127 uscfp = umcf->upstreams.elts; |
| 6115 | 128 |
| 129 if (shm_zone->shm.exists) { | |
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130 peers = shpool->data; |
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131 |
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132 for (i = 0; i < umcf->upstreams.nelts; i++) { |
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133 uscf = uscfp[i]; |
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134 |
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135 if (uscf->shm_zone != shm_zone) { |
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136 continue; |
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137 } |
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138 |
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139 uscf->peer.data = peers; |
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140 peers = peers->zone_next; |
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141 } |
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142 |
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143 return NGX_OK; |
| 6115 | 144 } |
| 145 | |
| 146 len = sizeof(" in upstream zone \"\"") + shm_zone->shm.name.len; | |
| 147 | |
| 148 shpool->log_ctx = ngx_slab_alloc(shpool, len); | |
| 149 if (shpool->log_ctx == NULL) { | |
| 150 return NGX_ERROR; | |
| 151 } | |
| 152 | |
| 153 ngx_sprintf(shpool->log_ctx, " in upstream zone \"%V\"%Z", | |
| 154 &shm_zone->shm.name); | |
| 155 | |
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156 |
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157 /* copy peers to shared memory */ |
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158 |
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159 peersp = (ngx_stream_upstream_rr_peers_t **) (void *) &shpool->data; |
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160 |
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161 for (i = 0; i < umcf->upstreams.nelts; i++) { |
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162 uscf = uscfp[i]; |
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163 |
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164 if (uscf->shm_zone != shm_zone) { |
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165 continue; |
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166 } |
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167 |
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168 peers = ngx_stream_upstream_zone_copy_peers(shpool, uscf); |
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169 if (peers == NULL) { |
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170 return NGX_ERROR; |
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171 } |
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172 |
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173 *peersp = peers; |
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174 peersp = &peers->zone_next; |
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175 } |
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176 |
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177 return NGX_OK; |
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178 } |
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179 |
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180 |
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181 static ngx_stream_upstream_rr_peers_t * |
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182 ngx_stream_upstream_zone_copy_peers(ngx_slab_pool_t *shpool, |
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183 ngx_stream_upstream_srv_conf_t *uscf) |
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184 { |
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185 ngx_stream_upstream_rr_peer_t *peer, **peerp; |
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186 ngx_stream_upstream_rr_peers_t *peers, *backup; |
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187 |
| 6115 | 188 peers = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t)); |
| 189 if (peers == NULL) { | |
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190 return NULL; |
| 6115 | 191 } |
| 192 | |
| 193 ngx_memcpy(peers, uscf->peer.data, sizeof(ngx_stream_upstream_rr_peers_t)); | |
| 194 | |
| 195 peers->shpool = shpool; | |
| 196 | |
| 197 for (peerp = &peers->peer; *peerp; peerp = &peer->next) { | |
| 198 /* pool is unlocked */ | |
| 199 peer = ngx_slab_calloc_locked(shpool, | |
| 200 sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 201 if (peer == NULL) { | |
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202 return NULL; |
| 6115 | 203 } |
| 204 | |
| 205 ngx_memcpy(peer, *peerp, sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 206 | |
| 207 *peerp = peer; | |
| 208 } | |
| 209 | |
| 210 if (peers->next == NULL) { | |
| 211 goto done; | |
| 212 } | |
| 213 | |
| 214 backup = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t)); | |
| 215 if (backup == NULL) { | |
|
6198
311d232ad803
Upstream: fixed shared upstreams on win32.
Ruslan Ermilov <ru@nginx.com>
parents:
6174
diff
changeset
|
216 return NULL; |
| 6115 | 217 } |
| 218 | |
| 219 ngx_memcpy(backup, peers->next, sizeof(ngx_stream_upstream_rr_peers_t)); | |
| 220 | |
| 221 backup->shpool = shpool; | |
| 222 | |
| 223 for (peerp = &backup->peer; *peerp; peerp = &peer->next) { | |
| 224 /* pool is unlocked */ | |
| 225 peer = ngx_slab_calloc_locked(shpool, | |
| 226 sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 227 if (peer == NULL) { | |
|
6198
311d232ad803
Upstream: fixed shared upstreams on win32.
Ruslan Ermilov <ru@nginx.com>
parents:
6174
diff
changeset
|
228 return NULL; |
| 6115 | 229 } |
| 230 | |
| 231 ngx_memcpy(peer, *peerp, sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 232 | |
| 233 *peerp = peer; | |
| 234 } | |
| 235 | |
| 236 peers->next = backup; | |
| 237 | |
| 238 done: | |
| 239 | |
| 240 uscf->peer.data = peers; | |
| 241 | |
|
6198
311d232ad803
Upstream: fixed shared upstreams on win32.
Ruslan Ermilov <ru@nginx.com>
parents:
6174
diff
changeset
|
242 return peers; |
| 6115 | 243 } |