Mercurial > hg > nginx
annotate src/http/modules/ngx_http_upstream_ip_hash_module.c @ 4412:d620f497c50f
Copyright updated.
| author | Maxim Konovalov <maxim@nginx.com> |
|---|---|
| date | Wed, 18 Jan 2012 15:07:43 +0000 |
| parents | 4fc91bae6f83 |
| children | 382c523d253a 0141b4aec0e4 |
| rev | line source |
|---|---|
| 884 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 884 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_http.h> | |
| 11 | |
| 12 | |
| 13 typedef struct { | |
| 14 /* the round robin data must be first */ | |
| 15 ngx_http_upstream_rr_peer_data_t rrp; | |
| 16 | |
| 17 ngx_uint_t hash; | |
| 18 | |
| 19 u_char addr[3]; | |
| 20 | |
| 21 u_char tries; | |
| 22 | |
| 23 ngx_event_get_peer_pt get_rr_peer; | |
| 24 } ngx_http_upstream_ip_hash_peer_data_t; | |
| 25 | |
| 26 | |
| 27 static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, | |
| 28 ngx_http_upstream_srv_conf_t *us); | |
| 29 static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, | |
| 30 void *data); | |
| 31 static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 32 void *conf); | |
| 33 | |
| 34 | |
| 35 static ngx_command_t ngx_http_upstream_ip_hash_commands[] = { | |
| 36 | |
| 37 { ngx_string("ip_hash"), | |
| 38 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS, | |
| 39 ngx_http_upstream_ip_hash, | |
| 40 0, | |
| 41 0, | |
| 42 NULL }, | |
| 43 | |
| 44 ngx_null_command | |
| 45 }; | |
| 46 | |
| 47 | |
| 48 static ngx_http_module_t ngx_http_upstream_ip_hash_module_ctx = { | |
| 49 NULL, /* preconfiguration */ | |
| 50 NULL, /* postconfiguration */ | |
| 51 | |
| 52 NULL, /* create main configuration */ | |
| 53 NULL, /* init main configuration */ | |
| 54 | |
| 55 NULL, /* create server configuration */ | |
| 56 NULL, /* merge server configuration */ | |
| 57 | |
| 58 NULL, /* create location configuration */ | |
| 59 NULL /* merge location configuration */ | |
| 60 }; | |
| 61 | |
| 62 | |
| 63 ngx_module_t ngx_http_upstream_ip_hash_module = { | |
| 64 NGX_MODULE_V1, | |
| 65 &ngx_http_upstream_ip_hash_module_ctx, /* module context */ | |
| 66 ngx_http_upstream_ip_hash_commands, /* module directives */ | |
| 67 NGX_HTTP_MODULE, /* module type */ | |
| 68 NULL, /* init master */ | |
| 69 NULL, /* init module */ | |
| 70 NULL, /* init process */ | |
| 71 NULL, /* init thread */ | |
| 72 NULL, /* exit thread */ | |
| 73 NULL, /* exit process */ | |
| 74 NULL, /* exit master */ | |
| 75 NGX_MODULE_V1_PADDING | |
| 76 }; | |
| 77 | |
| 78 | |
| 79 ngx_int_t | |
| 80 ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us) | |
| 81 { | |
| 82 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) { | |
| 83 return NGX_ERROR; | |
| 84 } | |
| 85 | |
| 86 us->peer.init = ngx_http_upstream_init_ip_hash_peer; | |
| 87 | |
| 88 return NGX_OK; | |
| 89 } | |
| 90 | |
| 91 | |
| 92 static ngx_int_t | |
| 93 ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, | |
| 94 ngx_http_upstream_srv_conf_t *us) | |
| 95 { | |
|
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96 u_char *p; |
| 884 | 97 struct sockaddr_in *sin; |
| 98 ngx_http_upstream_ip_hash_peer_data_t *iphp; | |
| 99 | |
| 100 iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t)); | |
| 101 if (iphp == NULL) { | |
| 102 return NGX_ERROR; | |
| 103 } | |
| 104 | |
| 105 r->upstream->peer.data = &iphp->rrp; | |
| 106 | |
| 107 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) { | |
| 108 return NGX_ERROR; | |
| 109 } | |
| 110 | |
| 111 r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer; | |
| 112 | |
| 113 /* AF_INET only */ | |
|
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114 |
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115 if (r->connection->sockaddr->sa_family == AF_INET) { |
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116 |
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117 sin = (struct sockaddr_in *) r->connection->sockaddr; |
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118 p = (u_char *) &sin->sin_addr.s_addr; |
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119 iphp->addr[0] = p[0]; |
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120 iphp->addr[1] = p[1]; |
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121 iphp->addr[2] = p[2]; |
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122 |
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123 } else { |
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124 iphp->addr[0] = 0; |
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125 iphp->addr[1] = 0; |
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126 iphp->addr[2] = 0; |
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127 } |
| 884 | 128 |
| 129 iphp->hash = 89; | |
| 130 iphp->tries = 0; | |
| 131 iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer; | |
| 132 | |
| 133 return NGX_OK; | |
| 134 } | |
| 135 | |
| 136 | |
| 137 static ngx_int_t | |
| 138 ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data) | |
| 139 { | |
| 140 ngx_http_upstream_ip_hash_peer_data_t *iphp = data; | |
| 141 | |
| 142 time_t now; | |
| 143 uintptr_t m; | |
| 144 ngx_uint_t i, n, p, hash; | |
| 145 ngx_http_upstream_rr_peer_t *peer; | |
| 146 | |
| 147 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 148 "get ip hash peer, try: %ui", pc->tries); | |
| 149 | |
| 150 /* TODO: cached */ | |
| 151 | |
|
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152 if (iphp->tries > 20 || iphp->rrp.peers->single) { |
| 884 | 153 return iphp->get_rr_peer(pc, &iphp->rrp); |
| 154 } | |
| 155 | |
| 156 now = ngx_time(); | |
| 157 | |
| 158 pc->cached = 0; | |
| 159 pc->connection = NULL; | |
| 160 | |
| 161 hash = iphp->hash; | |
| 162 | |
| 163 for ( ;; ) { | |
| 164 | |
| 165 for (i = 0; i < 3; i++) { | |
| 166 hash = (hash * 113 + iphp->addr[i]) % 6271; | |
| 167 } | |
| 168 | |
| 169 p = hash % iphp->rrp.peers->number; | |
| 170 | |
| 171 n = p / (8 * sizeof(uintptr_t)); | |
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172 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); |
| 884 | 173 |
| 174 if (!(iphp->rrp.tried[n] & m)) { | |
| 175 | |
| 176 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 177 "get ip hash peer, hash: %ui %04XA", p, m); | |
| 178 | |
| 179 peer = &iphp->rrp.peers->peer[p]; | |
| 180 | |
| 181 /* ngx_lock_mutex(iphp->rrp.peers->mutex); */ | |
| 182 | |
| 183 if (!peer->down) { | |
| 184 | |
| 1025 | 185 if (peer->max_fails == 0 || peer->fails < peer->max_fails) { |
| 186 break; | |
| 187 } | |
| 884 | 188 |
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189 if (now - peer->checked > peer->fail_timeout) { |
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190 peer->checked = now; |
| 1025 | 191 break; |
| 192 } | |
| 1129 | 193 } |
| 884 | 194 |
| 1129 | 195 iphp->rrp.tried[n] |= m; |
| 884 | 196 |
| 197 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */ | |
| 198 | |
| 199 pc->tries--; | |
| 200 } | |
| 201 | |
| 202 if (++iphp->tries >= 20) { | |
| 203 return iphp->get_rr_peer(pc, &iphp->rrp); | |
| 204 } | |
| 205 } | |
| 206 | |
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207 iphp->rrp.current = p; |
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208 |
| 884 | 209 pc->sockaddr = peer->sockaddr; |
| 210 pc->socklen = peer->socklen; | |
| 211 pc->name = &peer->name; | |
| 212 | |
| 213 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */ | |
| 214 | |
| 215 iphp->rrp.tried[n] |= m; | |
| 216 iphp->hash = hash; | |
| 217 | |
| 218 return NGX_OK; | |
| 219 } | |
| 220 | |
| 221 | |
| 222 static char * | |
| 223 ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 224 { | |
| 225 ngx_http_upstream_srv_conf_t *uscf; | |
| 226 | |
| 227 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module); | |
| 228 | |
| 229 uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash; | |
| 230 | |
| 231 uscf->flags = NGX_HTTP_UPSTREAM_CREATE | |
| 232 |NGX_HTTP_UPSTREAM_MAX_FAILS | |
| 233 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT | |
| 234 |NGX_HTTP_UPSTREAM_DOWN; | |
| 235 | |
| 236 return NGX_CONF_OK; | |
| 237 } |