Mercurial > hg > nginx
annotate src/stream/ngx_stream_upstream_zone_module.c @ 6435:d1c791479bbb
Stream: post first read events from client and upstream.
The main proxy function ngx_stream_proxy_process() can terminate the stream
session. The code, following it, should check its return code to make sure the
session still exists. This happens in client and upstream initialization
functions. Swapping ngx_stream_proxy_process() call with the code, that
follows it, leaves the same problem vice versa.
In future ngx_stream_proxy_process() will call ngx_stream_proxy_next_upstream()
making it too complicated to know if stream session still exists after this
call.
Now ngx_stream_proxy_process() is called from posted event handlers in both
places with no code following it. The posted event is automatically removed
once session is terminated.
| author | Roman Arutyunyan <arut@nginx.com> |
|---|---|
| date | Tue, 15 Mar 2016 15:55:23 +0300 |
| parents | 341e4303d25b |
| children | 2f41d383c9c7 |
| 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, /* postconfiguration */ |
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36 |
| 6115 | 37 NULL, /* create main configuration */ |
| 38 NULL, /* init main configuration */ | |
| 39 | |
| 40 NULL, /* create server configuration */ | |
| 41 NULL, /* merge server configuration */ | |
| 42 }; | |
| 43 | |
| 44 | |
| 45 ngx_module_t ngx_stream_upstream_zone_module = { | |
| 46 NGX_MODULE_V1, | |
| 47 &ngx_stream_upstream_zone_module_ctx, /* module context */ | |
| 48 ngx_stream_upstream_zone_commands, /* module directives */ | |
| 49 NGX_STREAM_MODULE, /* module type */ | |
| 50 NULL, /* init master */ | |
| 51 NULL, /* init module */ | |
| 52 NULL, /* init process */ | |
| 53 NULL, /* init thread */ | |
| 54 NULL, /* exit thread */ | |
| 55 NULL, /* exit process */ | |
| 56 NULL, /* exit master */ | |
| 57 NGX_MODULE_V1_PADDING | |
| 58 }; | |
| 59 | |
| 60 | |
| 61 static char * | |
| 62 ngx_stream_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 63 { | |
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64 ssize_t size; |
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65 ngx_str_t *value; |
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66 ngx_stream_upstream_srv_conf_t *uscf; |
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67 ngx_stream_upstream_main_conf_t *umcf; |
| 6115 | 68 |
| 69 uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module); | |
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70 umcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_upstream_module); |
| 6115 | 71 |
| 72 value = cf->args->elts; | |
| 73 | |
| 74 if (!value[1].len) { | |
| 75 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 76 "invalid zone name \"%V\"", &value[1]); | |
| 77 return NGX_CONF_ERROR; | |
| 78 } | |
| 79 | |
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80 if (cf->args->nelts == 3) { |
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81 size = ngx_parse_size(&value[2]); |
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82 |
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83 if (size == NGX_ERROR) { |
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84 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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85 "invalid zone size \"%V\"", &value[2]); |
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86 return NGX_CONF_ERROR; |
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87 } |
| 6115 | 88 |
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89 if (size < (ssize_t) (8 * ngx_pagesize)) { |
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90 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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91 "zone \"%V\" is too small", &value[1]); |
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92 return NGX_CONF_ERROR; |
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93 } |
| 6115 | 94 |
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95 } else { |
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96 size = 0; |
| 6115 | 97 } |
| 98 | |
| 99 uscf->shm_zone = ngx_shared_memory_add(cf, &value[1], size, | |
| 100 &ngx_stream_upstream_module); | |
| 101 if (uscf->shm_zone == NULL) { | |
| 102 return NGX_CONF_ERROR; | |
| 103 } | |
| 104 | |
| 105 uscf->shm_zone->init = ngx_stream_upstream_init_zone; | |
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106 uscf->shm_zone->data = umcf; |
| 6115 | 107 |
| 108 uscf->shm_zone->noreuse = 1; | |
| 109 | |
| 110 return NGX_CONF_OK; | |
| 111 } | |
| 112 | |
| 113 | |
| 114 static ngx_int_t | |
| 115 ngx_stream_upstream_init_zone(ngx_shm_zone_t *shm_zone, void *data) | |
| 116 { | |
| 117 size_t len; | |
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118 ngx_uint_t i; |
| 6115 | 119 ngx_slab_pool_t *shpool; |
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120 ngx_stream_upstream_rr_peers_t *peers, **peersp; |
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121 ngx_stream_upstream_srv_conf_t *uscf, **uscfp; |
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122 ngx_stream_upstream_main_conf_t *umcf; |
| 6115 | 123 |
| 124 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; | |
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125 umcf = shm_zone->data; |
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126 uscfp = umcf->upstreams.elts; |
| 6115 | 127 |
| 128 if (shm_zone->shm.exists) { | |
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129 peers = shpool->data; |
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130 |
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131 for (i = 0; i < umcf->upstreams.nelts; i++) { |
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132 uscf = uscfp[i]; |
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133 |
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134 if (uscf->shm_zone != shm_zone) { |
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135 continue; |
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136 } |
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137 |
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138 uscf->peer.data = peers; |
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139 peers = peers->zone_next; |
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140 } |
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141 |
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142 return NGX_OK; |
| 6115 | 143 } |
| 144 | |
| 145 len = sizeof(" in upstream zone \"\"") + shm_zone->shm.name.len; | |
| 146 | |
| 147 shpool->log_ctx = ngx_slab_alloc(shpool, len); | |
| 148 if (shpool->log_ctx == NULL) { | |
| 149 return NGX_ERROR; | |
| 150 } | |
| 151 | |
| 152 ngx_sprintf(shpool->log_ctx, " in upstream zone \"%V\"%Z", | |
| 153 &shm_zone->shm.name); | |
| 154 | |
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155 |
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156 /* copy peers to shared memory */ |
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157 |
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158 peersp = (ngx_stream_upstream_rr_peers_t **) (void *) &shpool->data; |
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159 |
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160 for (i = 0; i < umcf->upstreams.nelts; i++) { |
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161 uscf = uscfp[i]; |
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162 |
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163 if (uscf->shm_zone != shm_zone) { |
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164 continue; |
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165 } |
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166 |
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167 peers = ngx_stream_upstream_zone_copy_peers(shpool, uscf); |
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168 if (peers == NULL) { |
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169 return NGX_ERROR; |
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170 } |
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171 |
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172 *peersp = peers; |
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173 peersp = &peers->zone_next; |
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174 } |
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175 |
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176 return NGX_OK; |
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177 } |
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178 |
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179 |
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180 static ngx_stream_upstream_rr_peers_t * |
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181 ngx_stream_upstream_zone_copy_peers(ngx_slab_pool_t *shpool, |
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182 ngx_stream_upstream_srv_conf_t *uscf) |
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183 { |
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184 ngx_stream_upstream_rr_peer_t *peer, **peerp; |
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185 ngx_stream_upstream_rr_peers_t *peers, *backup; |
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186 |
| 6115 | 187 peers = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t)); |
| 188 if (peers == NULL) { | |
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189 return NULL; |
| 6115 | 190 } |
| 191 | |
| 192 ngx_memcpy(peers, uscf->peer.data, sizeof(ngx_stream_upstream_rr_peers_t)); | |
| 193 | |
| 194 peers->shpool = shpool; | |
| 195 | |
| 196 for (peerp = &peers->peer; *peerp; peerp = &peer->next) { | |
| 197 /* pool is unlocked */ | |
| 198 peer = ngx_slab_calloc_locked(shpool, | |
| 199 sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 200 if (peer == NULL) { | |
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201 return NULL; |
| 6115 | 202 } |
| 203 | |
| 204 ngx_memcpy(peer, *peerp, sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 205 | |
| 206 *peerp = peer; | |
| 207 } | |
| 208 | |
| 209 if (peers->next == NULL) { | |
| 210 goto done; | |
| 211 } | |
| 212 | |
| 213 backup = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t)); | |
| 214 if (backup == NULL) { | |
|
6198
311d232ad803
Upstream: fixed shared upstreams on win32.
Ruslan Ermilov <ru@nginx.com>
parents:
6174
diff
changeset
|
215 return NULL; |
| 6115 | 216 } |
| 217 | |
| 218 ngx_memcpy(backup, peers->next, sizeof(ngx_stream_upstream_rr_peers_t)); | |
| 219 | |
| 220 backup->shpool = shpool; | |
| 221 | |
| 222 for (peerp = &backup->peer; *peerp; peerp = &peer->next) { | |
| 223 /* pool is unlocked */ | |
| 224 peer = ngx_slab_calloc_locked(shpool, | |
| 225 sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 226 if (peer == NULL) { | |
|
6198
311d232ad803
Upstream: fixed shared upstreams on win32.
Ruslan Ermilov <ru@nginx.com>
parents:
6174
diff
changeset
|
227 return NULL; |
| 6115 | 228 } |
| 229 | |
| 230 ngx_memcpy(peer, *peerp, sizeof(ngx_stream_upstream_rr_peer_t)); | |
| 231 | |
| 232 *peerp = peer; | |
| 233 } | |
| 234 | |
| 235 peers->next = backup; | |
| 236 | |
| 237 done: | |
| 238 | |
| 239 uscf->peer.data = peers; | |
| 240 | |
|
6198
311d232ad803
Upstream: fixed shared upstreams on win32.
Ruslan Ermilov <ru@nginx.com>
parents:
6174
diff
changeset
|
241 return peers; |
| 6115 | 242 } |