Mercurial > hg > nginx
annotate src/http/modules/ngx_http_upstream_ip_hash_module.c @ 2512:2e91aecb9e57
a prelimiary IPv6 support, HTTP listen
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sat, 21 Feb 2009 07:02:02 +0000 |
| parents | acb1f441e7b2 |
| children | 4fc91bae6f83 4919fb357a5d |
| rev | line source |
|---|---|
| 884 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4 */ | |
| 5 | |
| 6 | |
| 7 #include <ngx_config.h> | |
| 8 #include <ngx_core.h> | |
| 9 #include <ngx_http.h> | |
| 10 | |
| 11 | |
| 12 typedef struct { | |
| 13 /* the round robin data must be first */ | |
| 14 ngx_http_upstream_rr_peer_data_t rrp; | |
| 15 | |
| 16 ngx_uint_t hash; | |
| 17 | |
| 18 u_char addr[3]; | |
| 19 | |
| 20 u_char tries; | |
| 21 | |
| 22 ngx_event_get_peer_pt get_rr_peer; | |
| 23 } ngx_http_upstream_ip_hash_peer_data_t; | |
| 24 | |
| 25 | |
| 26 static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, | |
| 27 ngx_http_upstream_srv_conf_t *us); | |
| 28 static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, | |
| 29 void *data); | |
| 30 static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 31 void *conf); | |
| 32 | |
| 33 | |
| 34 static ngx_command_t ngx_http_upstream_ip_hash_commands[] = { | |
| 35 | |
| 36 { ngx_string("ip_hash"), | |
| 37 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS, | |
| 38 ngx_http_upstream_ip_hash, | |
| 39 0, | |
| 40 0, | |
| 41 NULL }, | |
| 42 | |
| 43 ngx_null_command | |
| 44 }; | |
| 45 | |
| 46 | |
| 47 static ngx_http_module_t ngx_http_upstream_ip_hash_module_ctx = { | |
| 48 NULL, /* preconfiguration */ | |
| 49 NULL, /* postconfiguration */ | |
| 50 | |
| 51 NULL, /* create main configuration */ | |
| 52 NULL, /* init main configuration */ | |
| 53 | |
| 54 NULL, /* create server configuration */ | |
| 55 NULL, /* merge server configuration */ | |
| 56 | |
| 57 NULL, /* create location configuration */ | |
| 58 NULL /* merge location configuration */ | |
| 59 }; | |
| 60 | |
| 61 | |
| 62 ngx_module_t ngx_http_upstream_ip_hash_module = { | |
| 63 NGX_MODULE_V1, | |
| 64 &ngx_http_upstream_ip_hash_module_ctx, /* module context */ | |
| 65 ngx_http_upstream_ip_hash_commands, /* module directives */ | |
| 66 NGX_HTTP_MODULE, /* module type */ | |
| 67 NULL, /* init master */ | |
| 68 NULL, /* init module */ | |
| 69 NULL, /* init process */ | |
| 70 NULL, /* init thread */ | |
| 71 NULL, /* exit thread */ | |
| 72 NULL, /* exit process */ | |
| 73 NULL, /* exit master */ | |
| 74 NGX_MODULE_V1_PADDING | |
| 75 }; | |
| 76 | |
| 77 | |
| 78 ngx_int_t | |
| 79 ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us) | |
| 80 { | |
| 81 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) { | |
| 82 return NGX_ERROR; | |
| 83 } | |
| 84 | |
| 85 us->peer.init = ngx_http_upstream_init_ip_hash_peer; | |
| 86 | |
| 87 return NGX_OK; | |
| 88 } | |
| 89 | |
| 90 | |
| 91 static ngx_int_t | |
| 92 ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, | |
| 93 ngx_http_upstream_srv_conf_t *us) | |
| 94 { | |
|
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ip_hash used wrong byte order
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95 u_char *p; |
| 884 | 96 struct sockaddr_in *sin; |
| 97 ngx_http_upstream_ip_hash_peer_data_t *iphp; | |
| 98 | |
| 99 iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t)); | |
| 100 if (iphp == NULL) { | |
| 101 return NGX_ERROR; | |
| 102 } | |
| 103 | |
| 104 r->upstream->peer.data = &iphp->rrp; | |
| 105 | |
| 106 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) { | |
| 107 return NGX_ERROR; | |
| 108 } | |
| 109 | |
| 110 r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer; | |
| 111 | |
| 112 /* AF_INET only */ | |
|
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113 |
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114 if (r->connection->sockaddr->sa_family == AF_INET) { |
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115 |
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116 sin = (struct sockaddr_in *) r->connection->sockaddr; |
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parents:
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117 p = (u_char *) &sin->sin_addr.s_addr; |
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118 iphp->addr[0] = p[0]; |
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a prelimiary IPv6 support, HTTP listen
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parents:
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119 iphp->addr[1] = p[1]; |
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a prelimiary IPv6 support, HTTP listen
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parents:
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120 iphp->addr[2] = p[2]; |
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parents:
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121 |
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a prelimiary IPv6 support, HTTP listen
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122 } else { |
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a prelimiary IPv6 support, HTTP listen
Igor Sysoev <igor@sysoev.ru>
parents:
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123 iphp->addr[0] = 0; |
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a prelimiary IPv6 support, HTTP listen
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parents:
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changeset
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124 iphp->addr[1] = 0; |
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a prelimiary IPv6 support, HTTP listen
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parents:
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125 iphp->addr[2] = 0; |
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a prelimiary IPv6 support, HTTP listen
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parents:
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changeset
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126 } |
| 884 | 127 |
| 128 iphp->hash = 89; | |
| 129 iphp->tries = 0; | |
| 130 iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer; | |
| 131 | |
| 132 return NGX_OK; | |
| 133 } | |
| 134 | |
| 135 | |
| 136 static ngx_int_t | |
| 137 ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data) | |
| 138 { | |
| 139 ngx_http_upstream_ip_hash_peer_data_t *iphp = data; | |
| 140 | |
| 141 time_t now; | |
| 142 uintptr_t m; | |
| 143 ngx_uint_t i, n, p, hash; | |
| 144 ngx_http_upstream_rr_peer_t *peer; | |
| 145 | |
| 146 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 147 "get ip hash peer, try: %ui", pc->tries); | |
| 148 | |
| 149 /* TODO: cached */ | |
| 150 | |
|
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update ip_hash to "backup" option
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151 if (iphp->tries > 20 || iphp->rrp.peers->single) { |
| 884 | 152 return iphp->get_rr_peer(pc, &iphp->rrp); |
| 153 } | |
| 154 | |
| 155 now = ngx_time(); | |
| 156 | |
| 157 pc->cached = 0; | |
| 158 pc->connection = NULL; | |
| 159 | |
| 160 hash = iphp->hash; | |
| 161 | |
| 162 for ( ;; ) { | |
| 163 | |
| 164 for (i = 0; i < 3; i++) { | |
| 165 hash = (hash * 113 + iphp->addr[i]) % 6271; | |
| 166 } | |
| 167 | |
| 168 p = hash % iphp->rrp.peers->number; | |
| 169 | |
| 170 n = p / (8 * sizeof(uintptr_t)); | |
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fix ip_hash on 64-bit platform
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171 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); |
| 884 | 172 |
| 173 if (!(iphp->rrp.tried[n] & m)) { | |
| 174 | |
| 175 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 176 "get ip hash peer, hash: %ui %04XA", p, m); | |
| 177 | |
| 178 peer = &iphp->rrp.peers->peer[p]; | |
| 179 | |
| 180 /* ngx_lock_mutex(iphp->rrp.peers->mutex); */ | |
| 181 | |
| 182 if (!peer->down) { | |
| 183 | |
| 1025 | 184 if (peer->max_fails == 0 || peer->fails < peer->max_fails) { |
| 185 break; | |
| 186 } | |
| 884 | 187 |
| 1025 | 188 if (now - peer->accessed > peer->fail_timeout) { |
| 189 peer->fails = 0; | |
| 190 break; | |
| 191 } | |
| 1129 | 192 } |
| 884 | 193 |
| 1129 | 194 iphp->rrp.tried[n] |= m; |
| 884 | 195 |
| 196 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */ | |
| 197 | |
| 198 pc->tries--; | |
| 199 } | |
| 200 | |
| 201 if (++iphp->tries >= 20) { | |
| 202 return iphp->get_rr_peer(pc, &iphp->rrp); | |
| 203 } | |
| 204 } | |
| 205 | |
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206 iphp->rrp.current = p; |
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b23a80f9a7b8
set current peer to use it in ngx_http_upstream_free_round_robin_peer()
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parents:
1416
diff
changeset
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207 |
| 884 | 208 pc->sockaddr = peer->sockaddr; |
| 209 pc->socklen = peer->socklen; | |
| 210 pc->name = &peer->name; | |
| 211 | |
| 212 /* ngx_unlock_mutex(iphp->rrp.peers->mutex); */ | |
| 213 | |
| 214 iphp->rrp.tried[n] |= m; | |
| 215 iphp->hash = hash; | |
| 216 | |
| 217 return NGX_OK; | |
| 218 } | |
| 219 | |
| 220 | |
| 221 static char * | |
| 222 ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 223 { | |
| 224 ngx_http_upstream_srv_conf_t *uscf; | |
| 225 | |
| 226 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module); | |
| 227 | |
| 228 uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash; | |
| 229 | |
| 230 uscf->flags = NGX_HTTP_UPSTREAM_CREATE | |
| 231 |NGX_HTTP_UPSTREAM_MAX_FAILS | |
| 232 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT | |
| 233 |NGX_HTTP_UPSTREAM_DOWN; | |
| 234 | |
| 235 return NGX_CONF_OK; | |
| 236 } |