Mercurial > hg > nginx
annotate src/http/ngx_http_upstream_round_robin.c @ 4010:74a93d3fdd85
Fixing cpu hog with all upstream servers marked "down".
The following configuration causes nginx to hog cpu due to infinite loop
in ngx_http_upstream_get_peer():
upstream backend {
server 127.0.0.1:8080 down;
server 127.0.0.1:8080 down;
}
server {
...
location / {
proxy_pass http://backend;
}
}
Make sure we don't loop infinitely in ngx_http_upstream_get_peer() but stop
after resetting peer weights once.
Return 0 if we are stuck. This is guaranteed to work as peer 0 always exists,
and eventually ngx_http_upstream_get_round_robin_peer() will do the right
thing falling back to backup servers or returning NGX_BUSY.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Thu, 18 Aug 2011 16:52:38 +0000 |
| parents | ff127ba3b091 |
| children | 9d4cbb09ae8b |
| 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 | |
|
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12 static ngx_int_t ngx_http_upstream_cmp_servers(const void *one, |
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13 const void *two); |
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14 static ngx_uint_t |
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15 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers); |
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16 |
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17 #if (NGX_HTTP_SSL) |
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18 |
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19 static ngx_int_t ngx_http_upstream_empty_set_session(ngx_peer_connection_t *pc, |
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20 void *data); |
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21 static void ngx_http_upstream_empty_save_session(ngx_peer_connection_t *pc, |
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22 void *data); |
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23 |
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24 #endif |
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25 |
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26 |
| 884 | 27 ngx_int_t |
| 28 ngx_http_upstream_init_round_robin(ngx_conf_t *cf, | |
| 29 ngx_http_upstream_srv_conf_t *us) | |
| 30 { | |
| 31 ngx_url_t u; | |
| 32 ngx_uint_t i, j, n; | |
| 33 ngx_http_upstream_server_t *server; | |
| 1378 | 34 ngx_http_upstream_rr_peers_t *peers, *backup; |
| 884 | 35 |
| 36 us->peer.init = ngx_http_upstream_init_round_robin_peer; | |
| 37 | |
| 38 if (us->servers) { | |
| 39 server = us->servers->elts; | |
| 40 | |
| 1378 | 41 n = 0; |
| 42 | |
| 884 | 43 for (i = 0; i < us->servers->nelts; i++) { |
| 1378 | 44 if (server[i].backup) { |
| 45 continue; | |
| 46 } | |
| 47 | |
| 884 | 48 n += server[i].naddrs; |
| 49 } | |
| 50 | |
| 51 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
| 52 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
| 53 if (peers == NULL) { | |
| 54 return NGX_ERROR; | |
| 55 } | |
| 56 | |
| 1378 | 57 peers->single = (n == 1); |
| 884 | 58 peers->number = n; |
| 59 peers->name = &us->host; | |
| 60 | |
| 61 n = 0; | |
| 62 | |
| 63 for (i = 0; i < us->servers->nelts; i++) { | |
| 64 for (j = 0; j < server[i].naddrs; j++) { | |
| 1378 | 65 if (server[i].backup) { |
| 66 continue; | |
| 67 } | |
| 68 | |
| 884 | 69 peers->peer[n].sockaddr = server[i].addrs[j].sockaddr; |
| 70 peers->peer[n].socklen = server[i].addrs[j].socklen; | |
| 71 peers->peer[n].name = server[i].addrs[j].name; | |
| 72 peers->peer[n].max_fails = server[i].max_fails; | |
| 73 peers->peer[n].fail_timeout = server[i].fail_timeout; | |
| 74 peers->peer[n].down = server[i].down; | |
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75 peers->peer[n].weight = server[i].down ? 0 : server[i].weight; |
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76 peers->peer[n].current_weight = peers->peer[n].weight; |
| 884 | 77 n++; |
| 78 } | |
| 79 } | |
| 80 | |
| 81 us->peer.data = peers; | |
| 82 | |
| 1379 | 83 ngx_sort(&peers->peer[0], (size_t) n, |
| 84 sizeof(ngx_http_upstream_rr_peer_t), | |
| 85 ngx_http_upstream_cmp_servers); | |
| 86 | |
| 1378 | 87 /* backup servers */ |
| 88 | |
| 89 n = 0; | |
| 90 | |
| 91 for (i = 0; i < us->servers->nelts; i++) { | |
| 92 if (!server[i].backup) { | |
| 93 continue; | |
| 94 } | |
| 95 | |
| 96 n += server[i].naddrs; | |
| 97 } | |
| 98 | |
| 99 if (n == 0) { | |
| 100 return NGX_OK; | |
| 101 } | |
| 102 | |
| 103 backup = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
| 104 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
| 105 if (backup == NULL) { | |
| 106 return NGX_ERROR; | |
| 107 } | |
| 108 | |
| 109 peers->single = 0; | |
| 110 backup->single = 0; | |
| 111 backup->number = n; | |
| 112 backup->name = &us->host; | |
| 113 | |
| 114 n = 0; | |
| 115 | |
| 116 for (i = 0; i < us->servers->nelts; i++) { | |
| 117 for (j = 0; j < server[i].naddrs; j++) { | |
| 118 if (!server[i].backup) { | |
| 119 continue; | |
| 120 } | |
| 121 | |
| 122 backup->peer[n].sockaddr = server[i].addrs[j].sockaddr; | |
| 123 backup->peer[n].socklen = server[i].addrs[j].socklen; | |
| 124 backup->peer[n].name = server[i].addrs[j].name; | |
| 125 backup->peer[n].weight = server[i].weight; | |
| 126 backup->peer[n].current_weight = server[i].weight; | |
| 127 backup->peer[n].max_fails = server[i].max_fails; | |
| 128 backup->peer[n].fail_timeout = server[i].fail_timeout; | |
| 129 backup->peer[n].down = server[i].down; | |
| 130 n++; | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 peers->next = backup; | |
| 135 | |
| 1379 | 136 ngx_sort(&backup->peer[0], (size_t) n, |
| 137 sizeof(ngx_http_upstream_rr_peer_t), | |
| 138 ngx_http_upstream_cmp_servers); | |
| 139 | |
| 884 | 140 return NGX_OK; |
| 141 } | |
| 142 | |
| 143 | |
| 144 /* an upstream implicitly defined by proxy_pass, etc. */ | |
| 145 | |
| 906 | 146 if (us->port == 0 && us->default_port == 0) { |
| 147 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
| 148 "no port in upstream \"%V\" in %s:%ui", | |
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149 &us->host, us->file_name, us->line); |
| 906 | 150 return NGX_ERROR; |
| 151 } | |
| 152 | |
| 884 | 153 ngx_memzero(&u, sizeof(ngx_url_t)); |
| 154 | |
| 155 u.host = us->host; | |
| 916 | 156 u.port = (in_port_t) (us->port ? us->port : us->default_port); |
| 884 | 157 |
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158 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { |
| 884 | 159 if (u.err) { |
| 160 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
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161 "%s in upstream \"%V\" in %s:%ui", |
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162 u.err, &us->host, us->file_name, us->line); |
| 884 | 163 } |
| 164 | |
| 165 return NGX_ERROR; | |
| 166 } | |
| 167 | |
| 168 n = u.naddrs; | |
| 169 | |
| 170 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
| 171 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
| 172 if (peers == NULL) { | |
| 173 return NGX_ERROR; | |
| 174 } | |
| 175 | |
| 1378 | 176 peers->single = (n == 1); |
| 884 | 177 peers->number = n; |
| 178 peers->name = &us->host; | |
| 179 | |
| 180 for (i = 0; i < u.naddrs; i++) { | |
| 1564 | 181 peers->peer[i].sockaddr = u.addrs[i].sockaddr; |
| 182 peers->peer[i].socklen = u.addrs[i].socklen; | |
| 183 peers->peer[i].name = u.addrs[i].name; | |
| 184 peers->peer[i].weight = 1; | |
| 185 peers->peer[i].current_weight = 1; | |
| 186 peers->peer[i].max_fails = 1; | |
| 187 peers->peer[i].fail_timeout = 10; | |
| 884 | 188 } |
| 189 | |
| 190 us->peer.data = peers; | |
| 191 | |
| 1378 | 192 /* implicitly defined upstream has no backup servers */ |
| 193 | |
| 884 | 194 return NGX_OK; |
| 195 } | |
| 196 | |
| 197 | |
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198 static ngx_int_t |
| 1379 | 199 ngx_http_upstream_cmp_servers(const void *one, const void *two) |
| 200 { | |
| 201 ngx_http_upstream_rr_peer_t *first, *second; | |
| 202 | |
| 203 first = (ngx_http_upstream_rr_peer_t *) one; | |
| 204 second = (ngx_http_upstream_rr_peer_t *) two; | |
| 205 | |
| 206 return (first->weight < second->weight); | |
| 207 } | |
| 208 | |
| 209 | |
| 884 | 210 ngx_int_t |
| 211 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r, | |
| 212 ngx_http_upstream_srv_conf_t *us) | |
| 213 { | |
| 214 ngx_uint_t n; | |
| 215 ngx_http_upstream_rr_peer_data_t *rrp; | |
| 216 | |
| 217 rrp = r->upstream->peer.data; | |
| 218 | |
| 219 if (rrp == NULL) { | |
| 220 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); | |
| 221 if (rrp == NULL) { | |
| 222 return NGX_ERROR; | |
| 223 } | |
| 224 | |
| 225 r->upstream->peer.data = rrp; | |
| 226 } | |
| 227 | |
| 228 rrp->peers = us->peer.data; | |
| 229 rrp->current = 0; | |
| 230 | |
| 231 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) { | |
| 232 rrp->tried = &rrp->data; | |
| 233 rrp->data = 0; | |
| 234 | |
| 235 } else { | |
| 236 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) | |
| 237 / (8 * sizeof(uintptr_t)); | |
| 238 | |
| 239 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); | |
| 240 if (rrp->tried == NULL) { | |
| 241 return NGX_ERROR; | |
| 242 } | |
| 243 } | |
| 244 | |
| 245 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; | |
| 246 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; | |
| 247 r->upstream->peer.tries = rrp->peers->number; | |
| 248 #if (NGX_HTTP_SSL) | |
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249 r->upstream->peer.set_session = |
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250 ngx_http_upstream_set_round_robin_peer_session; |
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251 r->upstream->peer.save_session = |
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252 ngx_http_upstream_save_round_robin_peer_session; |
| 884 | 253 #endif |
| 254 | |
| 255 return NGX_OK; | |
| 256 } | |
| 257 | |
| 258 | |
| 259 ngx_int_t | |
| 1658 | 260 ngx_http_upstream_create_round_robin_peer(ngx_http_request_t *r, |
| 261 ngx_http_upstream_resolved_t *ur) | |
| 262 { | |
| 263 u_char *p; | |
| 264 size_t len; | |
| 265 ngx_uint_t i, n; | |
| 266 struct sockaddr_in *sin; | |
| 267 ngx_http_upstream_rr_peers_t *peers; | |
| 268 ngx_http_upstream_rr_peer_data_t *rrp; | |
| 269 | |
| 270 rrp = r->upstream->peer.data; | |
| 271 | |
| 272 if (rrp == NULL) { | |
| 273 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); | |
| 274 if (rrp == NULL) { | |
| 275 return NGX_ERROR; | |
| 276 } | |
| 277 | |
| 278 r->upstream->peer.data = rrp; | |
| 279 } | |
| 280 | |
| 281 peers = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
| 282 + sizeof(ngx_http_upstream_rr_peer_t) * (ur->naddrs - 1)); | |
| 283 if (peers == NULL) { | |
| 284 return NGX_ERROR; | |
| 285 } | |
| 286 | |
| 287 peers->single = (ur->naddrs == 1); | |
| 288 peers->number = ur->naddrs; | |
| 289 peers->name = &ur->host; | |
| 290 | |
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291 if (ur->sockaddr) { |
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292 peers->peer[0].sockaddr = ur->sockaddr; |
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293 peers->peer[0].socklen = ur->socklen; |
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294 peers->peer[0].name = ur->host; |
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295 peers->peer[0].weight = 1; |
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296 peers->peer[0].current_weight = 1; |
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297 peers->peer[0].max_fails = 1; |
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298 peers->peer[0].fail_timeout = 10; |
| 1658 | 299 |
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300 } else { |
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301 |
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302 for (i = 0; i < ur->naddrs; i++) { |
| 1658 | 303 |
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304 len = NGX_INET_ADDRSTRLEN + sizeof(":65536") - 1; |
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305 |
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306 p = ngx_pnalloc(r->pool, len); |
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307 if (p == NULL) { |
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308 return NGX_ERROR; |
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309 } |
| 1658 | 310 |
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311 len = ngx_inet_ntop(AF_INET, &ur->addrs[i], p, NGX_INET_ADDRSTRLEN); |
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312 len = ngx_sprintf(&p[len], ":%d", ur->port) - p; |
| 1658 | 313 |
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314 sin = ngx_pcalloc(r->pool, sizeof(struct sockaddr_in)); |
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315 if (sin == NULL) { |
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316 return NGX_ERROR; |
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317 } |
| 1658 | 318 |
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319 sin->sin_family = AF_INET; |
|
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320 sin->sin_port = htons(ur->port); |
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321 sin->sin_addr.s_addr = ur->addrs[i]; |
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322 |
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323 peers->peer[i].sockaddr = (struct sockaddr *) sin; |
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324 peers->peer[i].socklen = sizeof(struct sockaddr_in); |
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325 peers->peer[i].name.len = len; |
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326 peers->peer[i].name.data = p; |
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327 peers->peer[i].weight = 1; |
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328 peers->peer[i].current_weight = 1; |
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329 peers->peer[i].max_fails = 1; |
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330 peers->peer[i].fail_timeout = 10; |
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331 } |
| 1658 | 332 } |
| 333 | |
| 334 rrp->peers = peers; | |
| 335 rrp->current = 0; | |
| 336 | |
| 337 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) { | |
| 338 rrp->tried = &rrp->data; | |
| 339 rrp->data = 0; | |
| 340 | |
| 341 } else { | |
| 342 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) | |
| 343 / (8 * sizeof(uintptr_t)); | |
| 344 | |
| 345 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); | |
| 346 if (rrp->tried == NULL) { | |
| 347 return NGX_ERROR; | |
| 348 } | |
| 349 } | |
| 350 | |
| 351 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; | |
| 352 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; | |
| 353 r->upstream->peer.tries = rrp->peers->number; | |
| 354 #if (NGX_HTTP_SSL) | |
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355 r->upstream->peer.set_session = ngx_http_upstream_empty_set_session; |
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356 r->upstream->peer.save_session = ngx_http_upstream_empty_save_session; |
| 1658 | 357 #endif |
| 358 | |
| 359 return NGX_OK; | |
| 360 } | |
| 361 | |
| 362 | |
| 363 ngx_int_t | |
| 884 | 364 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data) |
| 365 { | |
| 366 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
| 367 | |
| 1378 | 368 time_t now; |
| 369 uintptr_t m; | |
| 370 ngx_int_t rc; | |
| 371 ngx_uint_t i, n; | |
| 372 ngx_connection_t *c; | |
| 373 ngx_http_upstream_rr_peer_t *peer; | |
| 374 ngx_http_upstream_rr_peers_t *peers; | |
| 884 | 375 |
| 376 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 377 "get rr peer, try: %ui", pc->tries); | |
| 378 | |
| 379 now = ngx_time(); | |
| 380 | |
| 381 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
| 382 | |
| 383 if (rrp->peers->last_cached) { | |
| 384 | |
| 385 /* cached connection */ | |
| 386 | |
| 387 c = rrp->peers->cached[rrp->peers->last_cached]; | |
| 388 rrp->peers->last_cached--; | |
| 389 | |
| 390 /* ngx_unlock_mutex(ppr->peers->mutex); */ | |
| 391 | |
| 392 #if (NGX_THREADS) | |
| 393 c->read->lock = c->read->own_lock; | |
| 394 c->write->lock = c->write->own_lock; | |
| 395 #endif | |
| 396 | |
| 397 pc->connection = c; | |
| 398 pc->cached = 1; | |
| 399 | |
| 400 return NGX_OK; | |
| 401 } | |
| 402 | |
| 403 pc->cached = 0; | |
| 404 pc->connection = NULL; | |
| 405 | |
| 1378 | 406 if (rrp->peers->single) { |
| 884 | 407 peer = &rrp->peers->peer[0]; |
| 408 | |
| 409 } else { | |
| 410 | |
| 411 /* there are several peers */ | |
| 412 | |
| 413 if (pc->tries == rrp->peers->number) { | |
| 414 | |
| 415 /* it's a first try - get a current peer */ | |
| 416 | |
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417 i = pc->tries; |
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418 |
| 884 | 419 for ( ;; ) { |
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420 rrp->current = ngx_http_upstream_get_peer(rrp->peers); |
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421 |
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422 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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423 "get rr peer, current: %ui %i", |
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424 rrp->current, |
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425 rrp->peers->peer[rrp->current].current_weight); |
| 884 | 426 |
| 427 n = rrp->current / (8 * sizeof(uintptr_t)); | |
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428 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); |
| 884 | 429 |
| 430 if (!(rrp->tried[n] & m)) { | |
| 431 peer = &rrp->peers->peer[rrp->current]; | |
| 432 | |
| 433 if (!peer->down) { | |
| 434 | |
| 435 if (peer->max_fails == 0 | |
| 436 || peer->fails < peer->max_fails) | |
| 437 { | |
| 438 break; | |
| 439 } | |
| 440 | |
| 441 if (now - peer->accessed > peer->fail_timeout) { | |
| 442 peer->fails = 0; | |
| 443 break; | |
| 444 } | |
| 445 | |
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446 peer->current_weight = 0; |
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447 |
| 884 | 448 } else { |
| 449 rrp->tried[n] |= m; | |
| 450 } | |
| 451 | |
| 452 pc->tries--; | |
| 453 } | |
| 454 | |
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455 if (pc->tries == 0) { |
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456 goto failed; |
| 884 | 457 } |
| 458 | |
|
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459 if (--i == 0) { |
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460 ngx_log_error(NGX_LOG_ALERT, pc->log, 0, |
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461 "round robin upstream stuck on %ui tries", |
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462 pc->tries); |
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463 goto failed; |
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464 } |
| 884 | 465 } |
| 466 | |
| 467 peer->current_weight--; | |
| 468 | |
| 469 } else { | |
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470 |
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471 i = pc->tries; |
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472 |
| 884 | 473 for ( ;; ) { |
| 474 n = rrp->current / (8 * sizeof(uintptr_t)); | |
|
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|
475 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); |
| 884 | 476 |
| 477 if (!(rrp->tried[n] & m)) { | |
| 478 | |
| 479 peer = &rrp->peers->peer[rrp->current]; | |
| 480 | |
| 481 if (!peer->down) { | |
| 482 | |
| 483 if (peer->max_fails == 0 | |
| 484 || peer->fails < peer->max_fails) | |
| 485 { | |
| 486 break; | |
| 487 } | |
| 488 | |
| 489 if (now - peer->accessed > peer->fail_timeout) { | |
| 490 peer->fails = 0; | |
| 491 break; | |
| 492 } | |
| 493 | |
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494 peer->current_weight = 0; |
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495 |
| 884 | 496 } else { |
| 497 rrp->tried[n] |= m; | |
| 498 } | |
| 499 | |
| 500 pc->tries--; | |
| 501 } | |
| 502 | |
| 503 rrp->current++; | |
| 504 | |
| 505 if (rrp->current >= rrp->peers->number) { | |
| 506 rrp->current = 0; | |
| 507 } | |
| 508 | |
|
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509 if (pc->tries == 0) { |
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510 goto failed; |
| 884 | 511 } |
| 512 | |
|
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|
513 if (--i == 0) { |
|
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514 ngx_log_error(NGX_LOG_ALERT, pc->log, 0, |
|
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|
515 "round robin upstream stuck on %ui tries", |
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516 pc->tries); |
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517 goto failed; |
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|
518 } |
| 884 | 519 } |
| 520 | |
| 521 peer->current_weight--; | |
| 522 } | |
| 523 | |
| 524 rrp->tried[n] |= m; | |
| 525 } | |
| 526 | |
| 527 pc->sockaddr = peer->sockaddr; | |
| 528 pc->socklen = peer->socklen; | |
| 529 pc->name = &peer->name; | |
| 530 | |
| 531 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
| 532 | |
| 1378 | 533 if (pc->tries == 1 && rrp->peers->next) { |
| 534 pc->tries += rrp->peers->next->number; | |
| 535 | |
| 536 n = rrp->peers->next->number / (8 * sizeof(uintptr_t)) + 1; | |
| 1389 | 537 for (i = 0; i < n; i++) { |
| 1378 | 538 rrp->tried[i] = 0; |
| 539 } | |
| 540 } | |
| 541 | |
| 884 | 542 return NGX_OK; |
| 543 | |
| 544 failed: | |
| 545 | |
| 1378 | 546 peers = rrp->peers; |
| 547 | |
| 548 if (peers->next) { | |
| 549 | |
| 550 /* ngx_unlock_mutex(peers->mutex); */ | |
| 551 | |
| 552 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "backup servers"); | |
| 553 | |
| 554 rrp->peers = peers->next; | |
| 555 pc->tries = rrp->peers->number; | |
| 556 | |
| 557 n = rrp->peers->number / (8 * sizeof(uintptr_t)) + 1; | |
| 1389 | 558 for (i = 0; i < n; i++) { |
| 1378 | 559 rrp->tried[i] = 0; |
| 560 } | |
| 561 | |
| 562 rc = ngx_http_upstream_get_round_robin_peer(pc, rrp); | |
| 563 | |
| 564 if (rc != NGX_BUSY) { | |
| 565 return rc; | |
| 566 } | |
| 567 | |
| 568 /* ngx_lock_mutex(peers->mutex); */ | |
| 569 } | |
| 570 | |
| 884 | 571 /* all peers failed, mark them as live for quick recovery */ |
| 572 | |
| 1378 | 573 for (i = 0; i < peers->number; i++) { |
| 574 peers->peer[i].fails = 0; | |
| 884 | 575 } |
| 576 | |
| 1378 | 577 /* ngx_unlock_mutex(peers->mutex); */ |
| 884 | 578 |
| 1378 | 579 pc->name = peers->name; |
| 884 | 580 |
| 581 return NGX_BUSY; | |
| 582 } | |
| 583 | |
| 584 | |
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585 static ngx_uint_t |
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586 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers) |
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587 { |
|
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Maxim Dounin <mdounin@mdounin.ru>
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588 ngx_uint_t i, n, reset = 0; |
|
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589 ngx_http_upstream_rr_peer_t *peer; |
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590 |
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591 peer = &peers->peer[0]; |
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592 |
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593 for ( ;; ) { |
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594 |
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595 for (i = 0; i < peers->number; i++) { |
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596 |
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597 if (peer[i].current_weight <= 0) { |
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598 continue; |
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599 } |
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600 |
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601 n = i; |
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602 |
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603 while (i < peers->number - 1) { |
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604 |
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605 i++; |
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606 |
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607 if (peer[i].current_weight <= 0) { |
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608 continue; |
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609 } |
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610 |
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611 if (peer[n].current_weight * 1000 / peer[i].current_weight |
|
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Igor Sysoev <igor@sysoev.ru>
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|
612 > peer[n].weight * 1000 / peer[i].weight) |
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613 { |
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614 return n; |
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615 } |
|
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616 |
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617 n = i; |
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618 } |
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619 |
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620 if (peer[i].current_weight > 0) { |
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621 n = i; |
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622 } |
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623 |
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624 return n; |
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625 } |
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|
626 |
|
4010
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627 if (reset++) { |
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628 return 0; |
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629 } |
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|
630 |
|
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631 for (i = 0; i < peers->number; i++) { |
|
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632 peer[i].current_weight = peer[i].weight; |
|
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633 } |
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634 } |
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635 } |
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636 |
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637 |
| 884 | 638 void |
| 639 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data, | |
| 640 ngx_uint_t state) | |
| 641 { | |
| 642 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
| 643 | |
| 644 time_t now; | |
| 645 ngx_http_upstream_rr_peer_t *peer; | |
| 646 | |
| 647 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
| 648 "free rr peer %ui %ui", pc->tries, state); | |
| 649 | |
| 650 if (state == 0 && pc->tries == 0) { | |
| 651 return; | |
| 652 } | |
| 653 | |
| 654 /* TODO: NGX_PEER_KEEPALIVE */ | |
| 655 | |
| 1378 | 656 if (rrp->peers->single) { |
| 884 | 657 pc->tries = 0; |
| 658 return; | |
| 659 } | |
| 660 | |
| 661 if (state & NGX_PEER_FAILED) { | |
| 662 now = ngx_time(); | |
| 663 | |
| 664 peer = &rrp->peers->peer[rrp->current]; | |
| 665 | |
| 666 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
| 667 | |
| 668 peer->fails++; | |
| 669 peer->accessed = now; | |
| 670 | |
|
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671 if (peer->max_fails) { |
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672 peer->current_weight -= peer->weight / peer->max_fails; |
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673 } |
|
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674 |
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675 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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676 "free rr peer failed: %ui %i", |
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677 rrp->current, peer->current_weight); |
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678 |
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679 if (peer->current_weight < 0) { |
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680 peer->current_weight = 0; |
| 884 | 681 } |
| 682 | |
| 683 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
| 684 } | |
| 685 | |
| 686 rrp->current++; | |
| 687 | |
| 688 if (rrp->current >= rrp->peers->number) { | |
| 689 rrp->current = 0; | |
| 690 } | |
| 691 | |
| 692 if (pc->tries) { | |
| 693 pc->tries--; | |
| 694 } | |
| 695 | |
| 696 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
| 697 } | |
| 698 | |
| 699 | |
| 700 #if (NGX_HTTP_SSL) | |
| 701 | |
|
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702 ngx_int_t |
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703 ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc, |
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704 void *data) |
| 884 | 705 { |
| 706 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
| 707 | |
|
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708 ngx_int_t rc; |
| 884 | 709 ngx_ssl_session_t *ssl_session; |
| 710 ngx_http_upstream_rr_peer_t *peer; | |
| 711 | |
|
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712 peer = &rrp->peers->peer[rrp->current]; |
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|
713 |
|
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|
714 /* TODO: threads only mutex */ |
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|
715 /* ngx_lock_mutex(rrp->peers->mutex); */ |
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|
716 |
|
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|
717 ssl_session = peer->ssl_session; |
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|
718 |
|
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|
719 rc = ngx_ssl_set_session(pc->connection, ssl_session); |
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|
720 |
|
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|
721 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
| 1443 | 722 "set session: %p:%d", |
| 723 ssl_session, ssl_session ? ssl_session->references : 0); | |
|
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|
724 |
|
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|
725 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
|
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|
726 |
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|
727 return rc; |
|
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|
728 } |
|
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changeset
|
729 |
|
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changeset
|
730 |
|
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changeset
|
731 void |
|
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|
732 ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc, |
|
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|
733 void *data) |
|
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|
734 { |
|
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|
735 ngx_http_upstream_rr_peer_data_t *rrp = data; |
|
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|
736 |
|
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|
737 ngx_ssl_session_t *old_ssl_session, *ssl_session; |
|
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|
738 ngx_http_upstream_rr_peer_t *peer; |
|
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|
739 |
| 884 | 740 ssl_session = ngx_ssl_get_session(pc->connection); |
| 741 | |
| 742 if (ssl_session == NULL) { | |
| 743 return; | |
| 744 } | |
| 745 | |
|
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changeset
|
746 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
| 1443 | 747 "save session: %p:%d", ssl_session, ssl_session->references); |
|
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|
748 |
| 884 | 749 peer = &rrp->peers->peer[rrp->current]; |
| 750 | |
|
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changeset
|
751 /* TODO: threads only mutex */ |
| 884 | 752 /* ngx_lock_mutex(rrp->peers->mutex); */ |
|
1284
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changeset
|
753 |
|
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diff
changeset
|
754 old_ssl_session = peer->ssl_session; |
| 884 | 755 peer->ssl_session = ssl_session; |
|
1284
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|
756 |
| 884 | 757 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
| 758 | |
|
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|
759 if (old_ssl_session) { |
|
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changeset
|
760 |
|
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Igor Sysoev <igor@sysoev.ru>
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changeset
|
761 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
| 1443 | 762 "old session: %p:%d", |
|
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|
763 old_ssl_session, old_ssl_session->references); |
|
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|
764 |
| 884 | 765 /* TODO: may block */ |
|
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|
766 |
|
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changeset
|
767 ngx_ssl_free_session(old_ssl_session); |
| 884 | 768 } |
| 769 } | |
| 770 | |
|
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|
771 |
|
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|
772 static ngx_int_t |
|
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|
773 ngx_http_upstream_empty_set_session(ngx_peer_connection_t *pc, void *data) |
|
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|
774 { |
|
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|
775 return NGX_OK; |
|
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|
776 } |
|
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changeset
|
777 |
|
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changeset
|
778 |
|
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diff
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|
779 static void |
|
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|
780 ngx_http_upstream_empty_save_session(ngx_peer_connection_t *pc, void *data) |
|
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|
781 { |
|
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|
782 return; |
|
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|
783 } |
|
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|
784 |
| 884 | 785 #endif |