Mercurial > hg > nginx
annotate src/http/ngx_http_upstream_round_robin.c @ 1376:6ff8c0c1e194
"down" server caused endless loop
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 07 Aug 2007 12:34:20 +0000 |
parents | 8f5b5641966c |
children | 0be898896d1a |
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 | |
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12 static ngx_uint_t |
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13 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers); |
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14 |
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15 |
884 | 16 ngx_int_t |
17 ngx_http_upstream_init_round_robin(ngx_conf_t *cf, | |
18 ngx_http_upstream_srv_conf_t *us) | |
19 { | |
20 ngx_url_t u; | |
21 ngx_uint_t i, j, n; | |
22 ngx_http_upstream_server_t *server; | |
23 ngx_http_upstream_rr_peers_t *peers; | |
24 | |
25 us->peer.init = ngx_http_upstream_init_round_robin_peer; | |
26 | |
27 if (us->servers) { | |
28 n = 0; | |
29 server = us->servers->elts; | |
30 | |
31 for (i = 0; i < us->servers->nelts; i++) { | |
32 n += server[i].naddrs; | |
33 } | |
34 | |
35 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
36 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
37 if (peers == NULL) { | |
38 return NGX_ERROR; | |
39 } | |
40 | |
41 peers->number = n; | |
42 peers->name = &us->host; | |
43 | |
44 n = 0; | |
45 | |
46 for (i = 0; i < us->servers->nelts; i++) { | |
47 for (j = 0; j < server[i].naddrs; j++) { | |
48 peers->peer[n].sockaddr = server[i].addrs[j].sockaddr; | |
49 peers->peer[n].socklen = server[i].addrs[j].socklen; | |
50 peers->peer[n].name = server[i].addrs[j].name; | |
51 peers->peer[n].max_fails = server[i].max_fails; | |
52 peers->peer[n].fail_timeout = server[i].fail_timeout; | |
53 peers->peer[n].down = server[i].down; | |
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54 peers->peer[n].weight = server[i].down ? 0 : server[i].weight; |
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55 peers->peer[n].current_weight = peers->peer[n].weight; |
884 | 56 n++; |
57 } | |
58 } | |
59 | |
60 us->peer.data = peers; | |
61 | |
62 return NGX_OK; | |
63 } | |
64 | |
65 | |
66 /* an upstream implicitly defined by proxy_pass, etc. */ | |
67 | |
906 | 68 if (us->port == 0 && us->default_port == 0) { |
69 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
70 "no port in upstream \"%V\" in %s:%ui", | |
71 &us->host, us->file_name.data, us->line); | |
72 return NGX_ERROR; | |
73 } | |
74 | |
884 | 75 ngx_memzero(&u, sizeof(ngx_url_t)); |
76 | |
77 u.host = us->host; | |
916 | 78 u.port = (in_port_t) (us->port ? us->port : us->default_port); |
884 | 79 |
80 if (ngx_inet_resolve_host(cf, &u) != NGX_OK) { | |
81 if (u.err) { | |
82 ngx_log_error(NGX_LOG_EMERG, cf->log, 0, | |
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83 "%s in upstream \"%V\" in %s:%ui", |
884 | 84 u.err, &us->host, us->file_name.data, us->line); |
85 } | |
86 | |
87 return NGX_ERROR; | |
88 } | |
89 | |
90 n = u.naddrs; | |
91 | |
92 peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) | |
93 + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); | |
94 if (peers == NULL) { | |
95 return NGX_ERROR; | |
96 } | |
97 | |
98 peers->number = n; | |
99 peers->name = &us->host; | |
100 | |
101 n = 0; | |
102 | |
103 for (i = 0; i < u.naddrs; i++) { | |
104 peers->peer[n].sockaddr = u.addrs[i].sockaddr; | |
105 peers->peer[n].socklen = u.addrs[i].socklen; | |
106 peers->peer[n].name = u.addrs[i].name; | |
107 peers->peer[n].weight = 1; | |
108 peers->peer[n].current_weight = 1; | |
109 peers->peer[n].max_fails = 1; | |
110 peers->peer[n].fail_timeout = 10; | |
111 n++; | |
112 } | |
113 | |
114 us->peer.data = peers; | |
115 | |
116 return NGX_OK; | |
117 } | |
118 | |
119 | |
120 ngx_int_t | |
121 ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r, | |
122 ngx_http_upstream_srv_conf_t *us) | |
123 { | |
124 ngx_uint_t n; | |
125 ngx_http_upstream_rr_peer_data_t *rrp; | |
126 | |
127 rrp = r->upstream->peer.data; | |
128 | |
129 if (rrp == NULL) { | |
130 rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); | |
131 if (rrp == NULL) { | |
132 return NGX_ERROR; | |
133 } | |
134 | |
135 r->upstream->peer.data = rrp; | |
136 } | |
137 | |
138 rrp->peers = us->peer.data; | |
139 rrp->current = 0; | |
140 | |
141 if (rrp->peers->number <= 8 * sizeof(uintptr_t)) { | |
142 rrp->tried = &rrp->data; | |
143 rrp->data = 0; | |
144 | |
145 } else { | |
146 n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) | |
147 / (8 * sizeof(uintptr_t)); | |
148 | |
149 rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); | |
150 if (rrp->tried == NULL) { | |
151 return NGX_ERROR; | |
152 } | |
153 } | |
154 | |
155 r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; | |
156 r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; | |
157 r->upstream->peer.tries = rrp->peers->number; | |
158 #if (NGX_HTTP_SSL) | |
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159 r->upstream->peer.set_session = |
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160 ngx_http_upstream_set_round_robin_peer_session; |
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161 r->upstream->peer.save_session = |
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162 ngx_http_upstream_save_round_robin_peer_session; |
884 | 163 #endif |
164 | |
165 return NGX_OK; | |
166 } | |
167 | |
168 | |
169 ngx_int_t | |
170 ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data) | |
171 { | |
172 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
173 | |
174 time_t now; | |
175 uintptr_t m; | |
176 ngx_uint_t i, n; | |
177 ngx_connection_t *c; | |
178 ngx_http_upstream_rr_peer_t *peer; | |
179 | |
180 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
181 "get rr peer, try: %ui", pc->tries); | |
182 | |
183 now = ngx_time(); | |
184 | |
185 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
186 | |
187 if (rrp->peers->last_cached) { | |
188 | |
189 /* cached connection */ | |
190 | |
191 c = rrp->peers->cached[rrp->peers->last_cached]; | |
192 rrp->peers->last_cached--; | |
193 | |
194 /* ngx_unlock_mutex(ppr->peers->mutex); */ | |
195 | |
196 #if (NGX_THREADS) | |
197 c->read->lock = c->read->own_lock; | |
198 c->write->lock = c->write->own_lock; | |
199 #endif | |
200 | |
201 pc->connection = c; | |
202 pc->cached = 1; | |
203 | |
204 return NGX_OK; | |
205 } | |
206 | |
207 pc->cached = 0; | |
208 pc->connection = NULL; | |
209 | |
210 if (rrp->peers->number == 1) { | |
211 peer = &rrp->peers->peer[0]; | |
212 | |
213 } else { | |
214 | |
215 /* there are several peers */ | |
216 | |
217 if (pc->tries == rrp->peers->number) { | |
218 | |
219 /* it's a first try - get a current peer */ | |
220 | |
221 for ( ;; ) { | |
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222 rrp->current = ngx_http_upstream_get_peer(rrp->peers); |
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223 |
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224 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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225 "get rr peer, current: %ui %i", |
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226 rrp->current, |
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227 rrp->peers->peer[rrp->current].current_weight); |
884 | 228 |
229 n = rrp->current / (8 * sizeof(uintptr_t)); | |
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230 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); |
884 | 231 |
232 if (!(rrp->tried[n] & m)) { | |
233 peer = &rrp->peers->peer[rrp->current]; | |
234 | |
235 if (!peer->down) { | |
236 | |
237 if (peer->max_fails == 0 | |
238 || peer->fails < peer->max_fails) | |
239 { | |
240 break; | |
241 } | |
242 | |
243 if (now - peer->accessed > peer->fail_timeout) { | |
244 peer->fails = 0; | |
245 break; | |
246 } | |
247 | |
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248 peer->current_weight = 0; |
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249 |
884 | 250 } else { |
251 rrp->tried[n] |= m; | |
252 } | |
253 | |
254 pc->tries--; | |
255 } | |
256 | |
257 if (pc->tries) { | |
258 continue; | |
259 } | |
260 | |
261 goto failed; | |
262 } | |
263 | |
264 peer->current_weight--; | |
265 | |
266 } else { | |
267 for ( ;; ) { | |
268 n = rrp->current / (8 * sizeof(uintptr_t)); | |
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269 m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); |
884 | 270 |
271 if (!(rrp->tried[n] & m)) { | |
272 | |
273 peer = &rrp->peers->peer[rrp->current]; | |
274 | |
275 if (!peer->down) { | |
276 | |
277 if (peer->max_fails == 0 | |
278 || peer->fails < peer->max_fails) | |
279 { | |
280 break; | |
281 } | |
282 | |
283 if (now - peer->accessed > peer->fail_timeout) { | |
284 peer->fails = 0; | |
285 break; | |
286 } | |
287 | |
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288 peer->current_weight = 0; |
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289 |
884 | 290 } else { |
291 rrp->tried[n] |= m; | |
292 } | |
293 | |
294 pc->tries--; | |
295 } | |
296 | |
297 rrp->current++; | |
298 | |
299 if (rrp->current >= rrp->peers->number) { | |
300 rrp->current = 0; | |
301 } | |
302 | |
303 if (pc->tries) { | |
304 continue; | |
305 } | |
306 | |
307 goto failed; | |
308 } | |
309 | |
310 peer->current_weight--; | |
311 } | |
312 | |
313 rrp->tried[n] |= m; | |
314 } | |
315 | |
316 pc->sockaddr = peer->sockaddr; | |
317 pc->socklen = peer->socklen; | |
318 pc->name = &peer->name; | |
319 | |
320 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
321 | |
322 return NGX_OK; | |
323 | |
324 failed: | |
325 | |
326 /* all peers failed, mark them as live for quick recovery */ | |
327 | |
328 for (i = 0; i < rrp->peers->number; i++) { | |
329 rrp->peers->peer[i].fails = 0; | |
330 } | |
331 | |
332 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
333 | |
334 pc->name = rrp->peers->name; | |
335 | |
336 return NGX_BUSY; | |
337 } | |
338 | |
339 | |
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340 static ngx_uint_t |
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341 ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers) |
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342 { |
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343 ngx_uint_t i, n; |
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344 ngx_http_upstream_rr_peer_t *peer; |
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345 |
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346 peer = &peers->peer[0]; |
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347 |
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348 for ( ;; ) { |
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349 |
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350 for (i = 0; i < peers->number; i++) { |
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351 |
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352 if (peer[i].current_weight <= 0) { |
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353 continue; |
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354 } |
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355 |
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356 n = i; |
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357 |
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358 while (i < peers->number - 1) { |
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359 |
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360 i++; |
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361 |
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362 if (peer[i].current_weight <= 0) { |
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363 continue; |
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364 } |
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365 |
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366 if (peer[n].current_weight * 1000 / peer[i].current_weight |
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367 >= peer[n].weight * 1000 / peer[i].weight) |
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368 { |
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369 return n; |
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370 } |
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371 |
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372 n = i; |
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373 } |
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374 |
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375 if (peer[i].current_weight > 0) { |
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376 n = i; |
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377 } |
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378 |
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379 return n; |
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380 } |
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381 |
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382 for (i = 0; i < peers->number; i++) { |
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383 if (peer[i].fails == 0) { |
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384 peer[i].current_weight += peer[i].weight; |
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385 |
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386 } else { |
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387 /* 1 allows to go to quick recovery when all peers failed */ |
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388 peer[i].current_weight = 1; |
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389 } |
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390 } |
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391 } |
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392 } |
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393 |
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394 |
884 | 395 void |
396 ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data, | |
397 ngx_uint_t state) | |
398 { | |
399 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
400 | |
401 time_t now; | |
402 ngx_http_upstream_rr_peer_t *peer; | |
403 | |
404 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
405 "free rr peer %ui %ui", pc->tries, state); | |
406 | |
407 if (state == 0 && pc->tries == 0) { | |
408 return; | |
409 } | |
410 | |
411 /* TODO: NGX_PEER_KEEPALIVE */ | |
412 | |
413 if (rrp->peers->number == 1) { | |
414 pc->tries = 0; | |
415 return; | |
416 } | |
417 | |
418 if (state & NGX_PEER_FAILED) { | |
419 now = ngx_time(); | |
420 | |
421 peer = &rrp->peers->peer[rrp->current]; | |
422 | |
423 /* ngx_lock_mutex(rrp->peers->mutex); */ | |
424 | |
425 peer->fails++; | |
426 peer->accessed = now; | |
427 | |
1344
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428 peer->current_weight -= peer->weight / peer->max_fails; |
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429 |
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430 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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431 "free rr peer failed: %ui %i", |
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432 rrp->current, peer->current_weight); |
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433 |
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434 if (peer->current_weight < 0) { |
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435 peer->current_weight = 0; |
884 | 436 } |
437 | |
438 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
439 } | |
440 | |
441 rrp->current++; | |
442 | |
443 if (rrp->current >= rrp->peers->number) { | |
444 rrp->current = 0; | |
445 } | |
446 | |
447 if (pc->tries) { | |
448 pc->tries--; | |
449 } | |
450 | |
451 /* ngx_unlock_mutex(rrp->peers->mutex); */ | |
452 } | |
453 | |
454 | |
455 #if (NGX_HTTP_SSL) | |
456 | |
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457 ngx_int_t |
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458 ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc, |
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459 void *data) |
884 | 460 { |
461 ngx_http_upstream_rr_peer_data_t *rrp = data; | |
462 | |
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463 ngx_int_t rc; |
884 | 464 ngx_ssl_session_t *ssl_session; |
465 ngx_http_upstream_rr_peer_t *peer; | |
466 | |
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467 peer = &rrp->peers->peer[rrp->current]; |
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468 |
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469 /* TODO: threads only mutex */ |
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470 /* ngx_lock_mutex(rrp->peers->mutex); */ |
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471 |
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472 ssl_session = peer->ssl_session; |
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473 |
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474 rc = ngx_ssl_set_session(pc->connection, ssl_session); |
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475 |
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476 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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477 "set session: %p:%d", |
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478 ssl_session, ssl_session ? ssl_session->references : 0); |
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479 |
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480 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
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481 |
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482 return rc; |
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483 } |
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484 |
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485 |
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486 void |
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487 ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc, |
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488 void *data) |
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489 { |
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490 ngx_http_upstream_rr_peer_data_t *rrp = data; |
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491 |
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492 ngx_ssl_session_t *old_ssl_session, *ssl_session; |
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493 ngx_http_upstream_rr_peer_t *peer; |
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494 |
884 | 495 ssl_session = ngx_ssl_get_session(pc->connection); |
496 | |
497 if (ssl_session == NULL) { | |
498 return; | |
499 } | |
500 | |
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501 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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502 "save session: %p:%d", ssl_session, ssl_session->references); |
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503 |
884 | 504 peer = &rrp->peers->peer[rrp->current]; |
505 | |
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506 /* TODO: threads only mutex */ |
884 | 507 /* ngx_lock_mutex(rrp->peers->mutex); */ |
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508 |
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509 old_ssl_session = peer->ssl_session; |
884 | 510 peer->ssl_session = ssl_session; |
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511 |
884 | 512 /* ngx_unlock_mutex(rrp->peers->mutex); */ |
513 | |
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514 if (old_ssl_session) { |
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515 |
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516 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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517 "old session: %p:%d", |
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518 old_ssl_session, old_ssl_session->references); |
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519 |
884 | 520 /* TODO: may block */ |
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521 |
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522 ngx_ssl_free_session(old_ssl_session); |
884 | 523 } |
524 } | |
525 | |
526 #endif |