Mercurial > hg > nginx
annotate src/http/ngx_http_upstream_round_robin.c @ 1476:67578e966dcc
split pop3, imap, and smtp handlers
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 13 Sep 2007 20:13:18 +0000 |
parents | a9132739bb57 |
children | 56f1ea5baabb |
rev | line source |
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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 | |
1379 | 12 static int ngx_http_upstream_cmp_servers(const void *one, const void *two); |
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13 static ngx_uint_t |
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14 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers); |
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15 |
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16 |
884 | 17 ngx_int_t |
18 ngx_http_upstream_init_round_robin(ngx_conf_t *cf, | |
19 ngx_http_upstream_srv_conf_t *us) | |
20 { | |
21 ngx_url_t u; | |
22 ngx_uint_t i, j, n; | |
23 ngx_http_upstream_server_t *server; | |
1378 | 24 ngx_http_upstream_rr_peers_t *peers, *backup; |
884 | 25 |
26 us->peer.init = ngx_http_upstream_init_round_robin_peer; | |
27 | |
28 if (us->servers) { | |
29 server = us->servers->elts; | |
30 | |
1378 | 31 n = 0; |
32 | |
884 | 33 for (i = 0; i < us->servers->nelts; i++) { |
1378 | 34 if (server[i].backup) { |
35 continue; | |
36 } | |
37 | |
884 | 38 n += server[i].naddrs; |
39 } | |
40 | |
41 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
42 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
43 if (peers == NULL) { | |
44 return NGX_ERROR; | |
45 } | |
46 | |
1378 | 47 peers->single = (n == 1); |
884 | 48 peers->number = n; |
49 peers->name = &us->host; | |
50 | |
51 n = 0; | |
52 | |
53 for (i = 0; i < us->servers->nelts; i++) { | |
54 for (j = 0; j < server[i].naddrs; j++) { | |
1378 | 55 if (server[i].backup) { |
56 continue; | |
57 } | |
58 | |
884 | 59 peers->peer[n].sockaddr = server[i].addrs[j].sockaddr; |
60 peers->peer[n].socklen = server[i].addrs[j].socklen; | |
61 peers->peer[n].name = server[i].addrs[j].name; | |
62 peers->peer[n].max_fails = server[i].max_fails; | |
63 peers->peer[n].fail_timeout = server[i].fail_timeout; | |
64 peers->peer[n].down = server[i].down; | |
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65 peers->peer[n].weight = server[i].down ? 0 : server[i].weight; |
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66 peers->peer[n].current_weight = peers->peer[n].weight; |
884 | 67 n++; |
68 } | |
69 } | |
70 | |
71 us->peer.data = peers; | |
72 | |
1379 | 73 ngx_sort(&peers->peer[0], (size_t) n, |
74 sizeof(ngx_http_upstream_rr_peer_t), | |
75 ngx_http_upstream_cmp_servers); | |
76 | |
1378 | 77 /* backup servers */ |
78 | |
79 n = 0; | |
80 | |
81 for (i = 0; i < us->servers->nelts; i++) { | |
82 if (!server[i].backup) { | |
83 continue; | |
84 } | |
85 | |
86 n += server[i].naddrs; | |
87 } | |
88 | |
89 if (n == 0) { | |
90 return NGX_OK; | |
91 } | |
92 | |
93 backup = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
94 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
95 if (backup == NULL) { | |
96 return NGX_ERROR; | |
97 } | |
98 | |
99 peers->single = 0; | |
100 backup->single = 0; | |
101 backup->number = n; | |
102 backup->name = &us->host; | |
103 | |
104 n = 0; | |
105 | |
106 for (i = 0; i < us->servers->nelts; i++) { | |
107 for (j = 0; j < server[i].naddrs; j++) { | |
108 if (!server[i].backup) { | |
109 continue; | |
110 } | |
111 | |
112 backup->peer[n].sockaddr = server[i].addrs[j].sockaddr; | |
113 backup->peer[n].socklen = server[i].addrs[j].socklen; | |
114 backup->peer[n].name = server[i].addrs[j].name; | |
115 backup->peer[n].weight = server[i].weight; | |
116 backup->peer[n].current_weight = server[i].weight; | |
117 backup->peer[n].max_fails = server[i].max_fails; | |
118 backup->peer[n].fail_timeout = server[i].fail_timeout; | |
119 backup->peer[n].down = server[i].down; | |
120 n++; | |
121 } | |
122 } | |
123 | |
124 peers->next = backup; | |
125 | |
1379 | 126 ngx_sort(&backup->peer[0], (size_t) n, |
127 sizeof(ngx_http_upstream_rr_peer_t), | |
128 ngx_http_upstream_cmp_servers); | |
129 | |
884 | 130 return NGX_OK; |
131 } | |
132 | |
133 | |
134 /* an upstream implicitly defined by proxy_pass, etc. */ | |
135 | |
906 | 136 if (us->port == 0 && us->default_port == 0) { |
137 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
138 "no port in upstream \"%V\" in %s:%ui", | |
139 &us->host, us->file_name.data, us->line); | |
140 return NGX_ERROR; | |
141 } | |
142 | |
884 | 143 ngx_memzero(&u, sizeof(ngx_url_t)); |
144 | |
145 u.host = us->host; | |
916 | 146 u.port = (in_port_t) (us->port ? us->port : us->default_port); |
884 | 147 |
148 if (ngx_inet_resolve_host(cf, &u) != NGX_OK) { | |
149 if (u.err) { | |
150 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
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151 "%s in upstream \"%V\" in %s:%ui", |
884 | 152 u.err, &us->host, us->file_name.data, us->line); |
153 } | |
154 | |
155 return NGX_ERROR; | |
156 } | |
157 | |
158 n = u.naddrs; | |
159 | |
160 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
161 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
162 if (peers == NULL) { | |
163 return NGX_ERROR; | |
164 } | |
165 | |
1378 | 166 peers->single = (n == 1); |
884 | 167 peers->number = n; |
168 peers->name = &us->host; | |
169 | |
170 n = 0; | |
171 | |
172 for (i = 0; i < u.naddrs; i++) { | |
173 peers->peer[n].sockaddr = u.addrs[i].sockaddr; | |
174 peers->peer[n].socklen = u.addrs[i].socklen; | |
175 peers->peer[n].name = u.addrs[i].name; | |
176 peers->peer[n].weight = 1; | |
177 peers->peer[n].current_weight = 1; | |
178 peers->peer[n].max_fails = 1; | |
179 peers->peer[n].fail_timeout = 10; | |
180 n++; | |
181 } | |
182 | |
183 us->peer.data = peers; | |
184 | |
1378 | 185 /* implicitly defined upstream has no backup servers */ |
186 | |
884 | 187 return NGX_OK; |
188 } | |
189 | |
190 | |
1379 | 191 static int |
192 ngx_http_upstream_cmp_servers(const void *one, const void *two) | |
193 { | |
194 ngx_http_upstream_rr_peer_t *first, *second; | |
195 | |
196 first = (ngx_http_upstream_rr_peer_t *) one; | |
197 second = (ngx_http_upstream_rr_peer_t *) two; | |
198 | |
199 return (first->weight < second->weight); | |
200 } | |
201 | |
202 | |
884 | 203 ngx_int_t |
204 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r, | |
205 ngx_http_upstream_srv_conf_t *us) | |
206 { | |
207 ngx_uint_t n; | |
208 ngx_http_upstream_rr_peer_data_t *rrp; | |
209 | |
210 rrp = r->upstream->peer.data; | |
211 | |
212 if (rrp == NULL) { | |
213 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); | |
214 if (rrp == NULL) { | |
215 return NGX_ERROR; | |
216 } | |
217 | |
218 r->upstream->peer.data = rrp; | |
219 } | |
220 | |
221 rrp->peers = us->peer.data; | |
222 rrp->current = 0; | |
223 | |
224 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) { | |
225 rrp->tried = &rrp->data; | |
226 rrp->data = 0; | |
227 | |
228 } else { | |
229 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) | |
230 / (8 * sizeof(uintptr_t)); | |
231 | |
232 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); | |
233 if (rrp->tried == NULL) { | |
234 return NGX_ERROR; | |
235 } | |
236 } | |
237 | |
238 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; | |
239 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; | |
240 r->upstream->peer.tries = rrp->peers->number; | |
241 #if (NGX_HTTP_SSL) | |
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242 r->upstream->peer.set_session = |
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243 ngx_http_upstream_set_round_robin_peer_session; |
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244 r->upstream->peer.save_session = |
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245 ngx_http_upstream_save_round_robin_peer_session; |
884 | 246 #endif |
247 | |
248 return NGX_OK; | |
249 } | |
250 | |
251 | |
252 ngx_int_t | |
253 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data) | |
254 { | |
255 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
256 | |
1378 | 257 time_t now; |
258 uintptr_t m; | |
259 ngx_int_t rc; | |
260 ngx_uint_t i, n; | |
261 ngx_connection_t *c; | |
262 ngx_http_upstream_rr_peer_t *peer; | |
263 ngx_http_upstream_rr_peers_t *peers; | |
884 | 264 |
265 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
266 "get rr peer, try: %ui", pc->tries); | |
267 | |
268 now = ngx_time(); | |
269 | |
270 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
271 | |
272 if (rrp->peers->last_cached) { | |
273 | |
274 /* cached connection */ | |
275 | |
276 c = rrp->peers->cached[rrp->peers->last_cached]; | |
277 rrp->peers->last_cached--; | |
278 | |
279 /* ngx_unlock_mutex(ppr->peers->mutex); */ | |
280 | |
281 #if (NGX_THREADS) | |
282 c->read->lock = c->read->own_lock; | |
283 c->write->lock = c->write->own_lock; | |
284 #endif | |
285 | |
286 pc->connection = c; | |
287 pc->cached = 1; | |
288 | |
289 return NGX_OK; | |
290 } | |
291 | |
292 pc->cached = 0; | |
293 pc->connection = NULL; | |
294 | |
1378 | 295 if (rrp->peers->single) { |
884 | 296 peer = &rrp->peers->peer[0]; |
297 | |
298 } else { | |
299 | |
300 /* there are several peers */ | |
301 | |
302 if (pc->tries == rrp->peers->number) { | |
303 | |
304 /* it's a first try - get a current peer */ | |
305 | |
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306 i = pc->tries; |
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307 |
884 | 308 for ( ;; ) { |
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309 rrp->current = ngx_http_upstream_get_peer(rrp->peers); |
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310 |
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311 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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312 "get rr peer, current: %ui %i", |
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313 rrp->current, |
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314 rrp->peers->peer[rrp->current].current_weight); |
884 | 315 |
316 n = rrp->current / (8 * sizeof(uintptr_t)); | |
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317 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); |
884 | 318 |
319 if (!(rrp->tried[n] & m)) { | |
320 peer = &rrp->peers->peer[rrp->current]; | |
321 | |
322 if (!peer->down) { | |
323 | |
324 if (peer->max_fails == 0 | |
325 || peer->fails < peer->max_fails) | |
326 { | |
327 break; | |
328 } | |
329 | |
330 if (now - peer->accessed > peer->fail_timeout) { | |
331 peer->fails = 0; | |
332 break; | |
333 } | |
334 | |
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335 peer->current_weight = 0; |
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336 |
884 | 337 } else { |
338 rrp->tried[n] |= m; | |
339 } | |
340 | |
341 pc->tries--; | |
342 } | |
343 | |
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344 if (pc->tries == 0) { |
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345 goto failed; |
884 | 346 } |
347 | |
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348 if (--i == 0) { |
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349 ngx_log_error(NGX_LOG_ALERT, pc->log, 0, |
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350 "round robin upstream stuck on %ui tries", |
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351 pc->tries); |
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352 goto failed; |
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353 } |
884 | 354 } |
355 | |
356 peer->current_weight--; | |
357 | |
358 } else { | |
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359 |
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360 i = pc->tries; |
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361 |
884 | 362 for ( ;; ) { |
363 n = rrp->current / (8 * sizeof(uintptr_t)); | |
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364 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); |
884 | 365 |
366 if (!(rrp->tried[n] & m)) { | |
367 | |
368 peer = &rrp->peers->peer[rrp->current]; | |
369 | |
370 if (!peer->down) { | |
371 | |
372 if (peer->max_fails == 0 | |
373 || peer->fails < peer->max_fails) | |
374 { | |
375 break; | |
376 } | |
377 | |
378 if (now - peer->accessed > peer->fail_timeout) { | |
379 peer->fails = 0; | |
380 break; | |
381 } | |
382 | |
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383 peer->current_weight = 0; |
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384 |
884 | 385 } else { |
386 rrp->tried[n] |= m; | |
387 } | |
388 | |
389 pc->tries--; | |
390 } | |
391 | |
392 rrp->current++; | |
393 | |
394 if (rrp->current >= rrp->peers->number) { | |
395 rrp->current = 0; | |
396 } | |
397 | |
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398 if (pc->tries == 0) { |
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399 goto failed; |
884 | 400 } |
401 | |
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402 if (--i == 0) { |
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403 ngx_log_error(NGX_LOG_ALERT, pc->log, 0, |
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404 "round robin upstream stuck on %ui tries", |
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405 pc->tries); |
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406 goto failed; |
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407 } |
884 | 408 } |
409 | |
410 peer->current_weight--; | |
411 } | |
412 | |
413 rrp->tried[n] |= m; | |
414 } | |
415 | |
416 pc->sockaddr = peer->sockaddr; | |
417 pc->socklen = peer->socklen; | |
418 pc->name = &peer->name; | |
419 | |
420 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
421 | |
1378 | 422 if (pc->tries == 1 && rrp->peers->next) { |
423 pc->tries += rrp->peers->next->number; | |
424 | |
425 n = rrp->peers->next->number / (8 * sizeof(uintptr_t)) + 1; | |
1389 | 426 for (i = 0; i < n; i++) { |
1378 | 427 rrp->tried[i] = 0; |
428 } | |
429 } | |
430 | |
884 | 431 return NGX_OK; |
432 | |
433 failed: | |
434 | |
1378 | 435 peers = rrp->peers; |
436 | |
437 if (peers->next) { | |
438 | |
439 /* ngx_unlock_mutex(peers->mutex); */ | |
440 | |
441 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "backup servers"); | |
442 | |
443 rrp->peers = peers->next; | |
444 pc->tries = rrp->peers->number; | |
445 | |
446 n = rrp->peers->number / (8 * sizeof(uintptr_t)) + 1; | |
1389 | 447 for (i = 0; i < n; i++) { |
1378 | 448 rrp->tried[i] = 0; |
449 } | |
450 | |
451 rc = ngx_http_upstream_get_round_robin_peer(pc, rrp); | |
452 | |
453 if (rc != NGX_BUSY) { | |
454 return rc; | |
455 } | |
456 | |
457 /* ngx_lock_mutex(peers->mutex); */ | |
458 } | |
459 | |
884 | 460 /* all peers failed, mark them as live for quick recovery */ |
461 | |
1378 | 462 for (i = 0; i < peers->number; i++) { |
463 peers->peer[i].fails = 0; | |
884 | 464 } |
465 | |
1378 | 466 /* ngx_unlock_mutex(peers->mutex); */ |
884 | 467 |
1378 | 468 pc->name = peers->name; |
884 | 469 |
470 return NGX_BUSY; | |
471 } | |
472 | |
473 | |
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474 static ngx_uint_t |
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475 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers) |
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476 { |
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477 ngx_uint_t i, n; |
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478 ngx_http_upstream_rr_peer_t *peer; |
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479 |
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480 peer = &peers->peer[0]; |
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481 |
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482 for ( ;; ) { |
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483 |
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484 for (i = 0; i < peers->number; i++) { |
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485 |
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486 if (peer[i].current_weight <= 0) { |
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487 continue; |
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488 } |
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489 |
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490 n = i; |
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491 |
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492 while (i < peers->number - 1) { |
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493 |
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494 i++; |
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495 |
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496 if (peer[i].current_weight <= 0) { |
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497 continue; |
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498 } |
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499 |
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500 if (peer[n].current_weight * 1000 / peer[i].current_weight |
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501 > peer[n].weight * 1000 / peer[i].weight) |
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502 { |
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503 return n; |
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504 } |
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505 |
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506 n = i; |
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507 } |
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508 |
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509 if (peer[i].current_weight > 0) { |
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510 n = i; |
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511 } |
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512 |
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513 return n; |
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514 } |
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515 |
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516 for (i = 0; i < peers->number; i++) { |
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517 if (peer->max_fails == 0 || peer->fails < peer->max_fails) { |
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518 peer[i].current_weight += peer[i].weight; |
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519 |
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520 } else { |
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521 /* 1 allows to go to quick recovery when all peers failed */ |
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522 peer[i].current_weight = 1; |
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523 } |
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524 } |
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525 } |
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526 } |
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527 |
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528 |
884 | 529 void |
530 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data, | |
531 ngx_uint_t state) | |
532 { | |
533 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
534 | |
535 time_t now; | |
536 ngx_http_upstream_rr_peer_t *peer; | |
537 | |
538 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
539 "free rr peer %ui %ui", pc->tries, state); | |
540 | |
541 if (state == 0 && pc->tries == 0) { | |
542 return; | |
543 } | |
544 | |
545 /* TODO: NGX_PEER_KEEPALIVE */ | |
546 | |
1378 | 547 if (rrp->peers->single) { |
884 | 548 pc->tries = 0; |
549 return; | |
550 } | |
551 | |
552 if (state & NGX_PEER_FAILED) { | |
553 now = ngx_time(); | |
554 | |
555 peer = &rrp->peers->peer[rrp->current]; | |
556 | |
557 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
558 | |
559 peer->fails++; | |
560 peer->accessed = now; | |
561 | |
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562 peer->current_weight -= peer->weight / peer->max_fails; |
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563 |
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564 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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565 "free rr peer failed: %ui %i", |
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566 rrp->current, peer->current_weight); |
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567 |
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568 if (peer->current_weight < 0) { |
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569 peer->current_weight = 0; |
884 | 570 } |
571 | |
572 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
573 } | |
574 | |
575 rrp->current++; | |
576 | |
577 if (rrp->current >= rrp->peers->number) { | |
578 rrp->current = 0; | |
579 } | |
580 | |
581 if (pc->tries) { | |
582 pc->tries--; | |
583 } | |
584 | |
585 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
586 } | |
587 | |
588 | |
589 #if (NGX_HTTP_SSL) | |
590 | |
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591 ngx_int_t |
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592 ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc, |
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593 void *data) |
884 | 594 { |
595 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
596 | |
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597 ngx_int_t rc; |
884 | 598 ngx_ssl_session_t *ssl_session; |
599 ngx_http_upstream_rr_peer_t *peer; | |
600 | |
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601 peer = &rrp->peers->peer[rrp->current]; |
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602 |
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603 /* TODO: threads only mutex */ |
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604 /* ngx_lock_mutex(rrp->peers->mutex); */ |
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605 |
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606 ssl_session = peer->ssl_session; |
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607 |
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608 rc = ngx_ssl_set_session(pc->connection, ssl_session); |
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609 |
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610 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
1443 | 611 "set session: %p:%d", |
612 ssl_session, ssl_session ? ssl_session->references : 0); | |
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613 |
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614 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
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615 |
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616 return rc; |
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617 } |
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618 |
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619 |
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620 void |
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621 ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc, |
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622 void *data) |
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623 { |
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624 ngx_http_upstream_rr_peer_data_t *rrp = data; |
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625 |
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626 ngx_ssl_session_t *old_ssl_session, *ssl_session; |
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627 ngx_http_upstream_rr_peer_t *peer; |
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628 |
884 | 629 ssl_session = ngx_ssl_get_session(pc->connection); |
630 | |
631 if (ssl_session == NULL) { | |
632 return; | |
633 } | |
634 | |
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635 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
1443 | 636 "save session: %p:%d", ssl_session, ssl_session->references); |
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637 |
884 | 638 peer = &rrp->peers->peer[rrp->current]; |
639 | |
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640 /* TODO: threads only mutex */ |
884 | 641 /* ngx_lock_mutex(rrp->peers->mutex); */ |
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642 |
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643 old_ssl_session = peer->ssl_session; |
884 | 644 peer->ssl_session = ssl_session; |
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645 |
884 | 646 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
647 | |
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648 if (old_ssl_session) { |
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649 |
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650 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
1443 | 651 "old session: %p:%d", |
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652 old_ssl_session, old_ssl_session->references); |
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653 |
884 | 654 /* TODO: may block */ |
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655 |
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656 ngx_ssl_free_session(old_ssl_session); |
884 | 657 } |
658 } | |
659 | |
660 #endif |