Mercurial > hg > nginx-quic
annotate src/stream/ngx_stream_upstream_hash_module.c @ 6629:8ed51b02f655
Stream: style.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Tue, 12 Jul 2016 17:34:40 +0300 |
parents | d5b5866c06c4 |
children | 52367732bcbc |
rev | line source |
---|---|
6115 | 1 |
2 /* | |
3 * Copyright (C) Roman Arutyunyan | |
4 * Copyright (C) Nginx, Inc. | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_stream.h> | |
11 | |
12 | |
13 typedef struct { | |
14 uint32_t hash; | |
15 ngx_str_t *server; | |
16 } ngx_stream_upstream_chash_point_t; | |
17 | |
18 | |
19 typedef struct { | |
20 ngx_uint_t number; | |
21 ngx_stream_upstream_chash_point_t point[1]; | |
22 } ngx_stream_upstream_chash_points_t; | |
23 | |
24 | |
25 typedef struct { | |
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26 ngx_stream_complex_value_t key; |
6115 | 27 ngx_stream_upstream_chash_points_t *points; |
28 } ngx_stream_upstream_hash_srv_conf_t; | |
29 | |
30 | |
31 typedef struct { | |
32 /* the round robin data must be first */ | |
33 ngx_stream_upstream_rr_peer_data_t rrp; | |
34 ngx_stream_upstream_hash_srv_conf_t *conf; | |
35 ngx_str_t key; | |
36 ngx_uint_t tries; | |
37 ngx_uint_t rehash; | |
38 uint32_t hash; | |
39 ngx_event_get_peer_pt get_rr_peer; | |
40 } ngx_stream_upstream_hash_peer_data_t; | |
41 | |
42 | |
43 static ngx_int_t ngx_stream_upstream_init_hash(ngx_conf_t *cf, | |
44 ngx_stream_upstream_srv_conf_t *us); | |
45 static ngx_int_t ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, | |
46 ngx_stream_upstream_srv_conf_t *us); | |
47 static ngx_int_t ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, | |
48 void *data); | |
49 | |
50 static ngx_int_t ngx_stream_upstream_init_chash(ngx_conf_t *cf, | |
51 ngx_stream_upstream_srv_conf_t *us); | |
52 static int ngx_libc_cdecl | |
53 ngx_stream_upstream_chash_cmp_points(const void *one, const void *two); | |
54 static ngx_uint_t ngx_stream_upstream_find_chash_point( | |
55 ngx_stream_upstream_chash_points_t *points, uint32_t hash); | |
56 static ngx_int_t ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, | |
57 ngx_stream_upstream_srv_conf_t *us); | |
58 static ngx_int_t ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, | |
59 void *data); | |
60 | |
61 static void *ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf); | |
62 static char *ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, | |
63 void *conf); | |
64 | |
65 | |
66 static ngx_command_t ngx_stream_upstream_hash_commands[] = { | |
67 | |
68 { ngx_string("hash"), | |
69 NGX_STREAM_UPS_CONF|NGX_CONF_TAKE12, | |
70 ngx_stream_upstream_hash, | |
71 NGX_STREAM_SRV_CONF_OFFSET, | |
72 0, | |
73 NULL }, | |
74 | |
75 ngx_null_command | |
76 }; | |
77 | |
78 | |
79 static ngx_stream_module_t ngx_stream_upstream_hash_module_ctx = { | |
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80 NULL, /* preconfiguration */ |
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81 NULL, /* postconfiguration */ |
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82 |
6115 | 83 NULL, /* create main configuration */ |
84 NULL, /* init main configuration */ | |
85 | |
86 ngx_stream_upstream_hash_create_conf, /* create server configuration */ | |
6629 | 87 NULL /* merge server configuration */ |
6115 | 88 }; |
89 | |
90 | |
91 ngx_module_t ngx_stream_upstream_hash_module = { | |
92 NGX_MODULE_V1, | |
93 &ngx_stream_upstream_hash_module_ctx, /* module context */ | |
94 ngx_stream_upstream_hash_commands, /* module directives */ | |
95 NGX_STREAM_MODULE, /* module type */ | |
96 NULL, /* init master */ | |
97 NULL, /* init module */ | |
98 NULL, /* init process */ | |
99 NULL, /* init thread */ | |
100 NULL, /* exit thread */ | |
101 NULL, /* exit process */ | |
102 NULL, /* exit master */ | |
103 NGX_MODULE_V1_PADDING | |
104 }; | |
105 | |
106 | |
107 static ngx_int_t | |
108 ngx_stream_upstream_init_hash(ngx_conf_t *cf, | |
109 ngx_stream_upstream_srv_conf_t *us) | |
110 { | |
111 if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { | |
112 return NGX_ERROR; | |
113 } | |
114 | |
115 us->peer.init = ngx_stream_upstream_init_hash_peer; | |
116 | |
117 return NGX_OK; | |
118 } | |
119 | |
120 | |
121 static ngx_int_t | |
122 ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, | |
123 ngx_stream_upstream_srv_conf_t *us) | |
124 { | |
125 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
126 ngx_stream_upstream_hash_peer_data_t *hp; | |
127 | |
128 hp = ngx_palloc(s->connection->pool, | |
129 sizeof(ngx_stream_upstream_hash_peer_data_t)); | |
130 if (hp == NULL) { | |
131 return NGX_ERROR; | |
132 } | |
133 | |
134 s->upstream->peer.data = &hp->rrp; | |
135 | |
136 if (ngx_stream_upstream_init_round_robin_peer(s, us) != NGX_OK) { | |
137 return NGX_ERROR; | |
138 } | |
139 | |
140 s->upstream->peer.get = ngx_stream_upstream_get_hash_peer; | |
141 | |
142 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
143 ngx_stream_upstream_hash_module); | |
144 | |
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145 if (ngx_stream_complex_value(s, &hcf->key, &hp->key) != NGX_OK) { |
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146 return NGX_ERROR; |
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147 } |
6115 | 148 |
149 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, | |
150 "upstream hash key:\"%V\"", &hp->key); | |
151 | |
152 hp->conf = hcf; | |
153 hp->tries = 0; | |
154 hp->rehash = 0; | |
155 hp->hash = 0; | |
156 hp->get_rr_peer = ngx_stream_upstream_get_round_robin_peer; | |
157 | |
158 return NGX_OK; | |
159 } | |
160 | |
161 | |
162 static ngx_int_t | |
163 ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, void *data) | |
164 { | |
165 ngx_stream_upstream_hash_peer_data_t *hp = data; | |
166 | |
167 time_t now; | |
168 u_char buf[NGX_INT_T_LEN]; | |
169 size_t size; | |
170 uint32_t hash; | |
171 ngx_int_t w; | |
172 uintptr_t m; | |
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173 ngx_uint_t n, p; |
6115 | 174 ngx_stream_upstream_rr_peer_t *peer; |
175 | |
176 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
177 "get hash peer, try: %ui", pc->tries); | |
178 | |
179 ngx_stream_upstream_rr_peers_wlock(hp->rrp.peers); | |
180 | |
181 if (hp->tries > 20 || hp->rrp.peers->single) { | |
182 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
183 return hp->get_rr_peer(pc, &hp->rrp); | |
184 } | |
185 | |
186 now = ngx_time(); | |
187 | |
188 pc->connection = NULL; | |
189 | |
190 for ( ;; ) { | |
191 | |
192 /* | |
193 * Hash expression is compatible with Cache::Memcached: | |
194 * ((crc32([REHASH] KEY) >> 16) & 0x7fff) + PREV_HASH | |
195 * with REHASH omitted at the first iteration. | |
196 */ | |
197 | |
198 ngx_crc32_init(hash); | |
199 | |
200 if (hp->rehash > 0) { | |
201 size = ngx_sprintf(buf, "%ui", hp->rehash) - buf; | |
202 ngx_crc32_update(&hash, buf, size); | |
203 } | |
204 | |
205 ngx_crc32_update(&hash, hp->key.data, hp->key.len); | |
206 ngx_crc32_final(hash); | |
207 | |
208 hash = (hash >> 16) & 0x7fff; | |
209 | |
210 hp->hash += hash; | |
211 hp->rehash++; | |
212 | |
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213 w = hp->hash % hp->rrp.peers->total_weight; |
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214 peer = hp->rrp.peers->peer; |
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215 p = 0; |
6115 | 216 |
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217 while (w >= peer->weight) { |
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218 w -= peer->weight; |
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219 peer = peer->next; |
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220 p++; |
6115 | 221 } |
222 | |
223 n = p / (8 * sizeof(uintptr_t)); | |
224 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); | |
225 | |
226 if (hp->rrp.tried[n] & m) { | |
227 goto next; | |
228 } | |
229 | |
230 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
231 "get hash peer, value:%uD, peer:%ui", hp->hash, p); | |
232 | |
233 if (peer->down) { | |
234 goto next; | |
235 } | |
236 | |
237 if (peer->max_fails | |
238 && peer->fails >= peer->max_fails | |
239 && now - peer->checked <= peer->fail_timeout) | |
240 { | |
241 goto next; | |
242 } | |
243 | |
244 break; | |
245 | |
246 next: | |
247 | |
248 if (++hp->tries > 20) { | |
249 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
250 return hp->get_rr_peer(pc, &hp->rrp); | |
251 } | |
252 } | |
253 | |
254 hp->rrp.current = peer; | |
255 | |
256 pc->sockaddr = peer->sockaddr; | |
257 pc->socklen = peer->socklen; | |
258 pc->name = &peer->name; | |
259 | |
260 peer->conns++; | |
261 | |
262 if (now - peer->checked > peer->fail_timeout) { | |
263 peer->checked = now; | |
264 } | |
265 | |
266 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
267 | |
268 hp->rrp.tried[n] |= m; | |
269 | |
270 return NGX_OK; | |
271 } | |
272 | |
273 | |
274 static ngx_int_t | |
275 ngx_stream_upstream_init_chash(ngx_conf_t *cf, | |
276 ngx_stream_upstream_srv_conf_t *us) | |
277 { | |
278 u_char *host, *port, c; | |
279 size_t host_len, port_len, size; | |
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280 uint32_t hash, base_hash; |
6115 | 281 ngx_str_t *server; |
282 ngx_uint_t npoints, i, j; | |
283 ngx_stream_upstream_rr_peer_t *peer; | |
284 ngx_stream_upstream_rr_peers_t *peers; | |
285 ngx_stream_upstream_chash_points_t *points; | |
286 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
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287 union { |
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288 uint32_t value; |
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289 u_char byte[4]; |
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290 } prev_hash; |
6115 | 291 |
292 if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { | |
293 return NGX_ERROR; | |
294 } | |
295 | |
296 us->peer.init = ngx_stream_upstream_init_chash_peer; | |
297 | |
298 peers = us->peer.data; | |
299 npoints = peers->total_weight * 160; | |
300 | |
301 size = sizeof(ngx_stream_upstream_chash_points_t) | |
302 + sizeof(ngx_stream_upstream_chash_point_t) * (npoints - 1); | |
303 | |
304 points = ngx_palloc(cf->pool, size); | |
305 if (points == NULL) { | |
306 return NGX_ERROR; | |
307 } | |
308 | |
309 points->number = 0; | |
310 | |
311 for (peer = peers->peer; peer; peer = peer->next) { | |
312 server = &peer->server; | |
313 | |
314 /* | |
315 * Hash expression is compatible with Cache::Memcached::Fast: | |
316 * crc32(HOST \0 PORT PREV_HASH). | |
317 */ | |
318 | |
319 if (server->len >= 5 | |
320 && ngx_strncasecmp(server->data, (u_char *) "unix:", 5) == 0) | |
321 { | |
322 host = server->data + 5; | |
323 host_len = server->len - 5; | |
324 port = NULL; | |
325 port_len = 0; | |
326 goto done; | |
327 } | |
328 | |
329 for (j = 0; j < server->len; j++) { | |
330 c = server->data[server->len - j - 1]; | |
331 | |
332 if (c == ':') { | |
333 host = server->data; | |
334 host_len = server->len - j - 1; | |
335 port = server->data + server->len - j; | |
336 port_len = j; | |
337 goto done; | |
338 } | |
339 | |
340 if (c < '0' || c > '9') { | |
341 break; | |
342 } | |
343 } | |
344 | |
345 host = server->data; | |
346 host_len = server->len; | |
347 port = NULL; | |
348 port_len = 0; | |
349 | |
350 done: | |
351 | |
352 ngx_crc32_init(base_hash); | |
353 ngx_crc32_update(&base_hash, host, host_len); | |
354 ngx_crc32_update(&base_hash, (u_char *) "", 1); | |
355 ngx_crc32_update(&base_hash, port, port_len); | |
356 | |
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357 prev_hash.value = 0; |
6115 | 358 npoints = peer->weight * 160; |
359 | |
360 for (j = 0; j < npoints; j++) { | |
361 hash = base_hash; | |
362 | |
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363 ngx_crc32_update(&hash, prev_hash.byte, 4); |
6115 | 364 ngx_crc32_final(hash); |
365 | |
366 points->point[points->number].hash = hash; | |
367 points->point[points->number].server = server; | |
368 points->number++; | |
369 | |
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370 #if (NGX_HAVE_LITTLE_ENDIAN) |
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371 prev_hash.value = hash; |
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372 #else |
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373 prev_hash.byte[0] = (u_char) (hash & 0xff); |
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374 prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff); |
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375 prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff); |
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376 prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff); |
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377 #endif |
6115 | 378 } |
379 } | |
380 | |
381 ngx_qsort(points->point, | |
382 points->number, | |
383 sizeof(ngx_stream_upstream_chash_point_t), | |
384 ngx_stream_upstream_chash_cmp_points); | |
385 | |
386 for (i = 0, j = 1; j < points->number; j++) { | |
387 if (points->point[i].hash != points->point[j].hash) { | |
388 points->point[++i] = points->point[j]; | |
389 } | |
390 } | |
391 | |
392 points->number = i + 1; | |
393 | |
394 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
395 ngx_stream_upstream_hash_module); | |
396 hcf->points = points; | |
397 | |
398 return NGX_OK; | |
399 } | |
400 | |
401 | |
402 static int ngx_libc_cdecl | |
403 ngx_stream_upstream_chash_cmp_points(const void *one, const void *two) | |
404 { | |
405 ngx_stream_upstream_chash_point_t *first = | |
406 (ngx_stream_upstream_chash_point_t *) one; | |
407 ngx_stream_upstream_chash_point_t *second = | |
408 (ngx_stream_upstream_chash_point_t *) two; | |
409 | |
410 if (first->hash < second->hash) { | |
411 return -1; | |
412 | |
413 } else if (first->hash > second->hash) { | |
414 return 1; | |
415 | |
416 } else { | |
417 return 0; | |
418 } | |
419 } | |
420 | |
421 | |
422 static ngx_uint_t | |
423 ngx_stream_upstream_find_chash_point(ngx_stream_upstream_chash_points_t *points, | |
424 uint32_t hash) | |
425 { | |
426 ngx_uint_t i, j, k; | |
427 ngx_stream_upstream_chash_point_t *point; | |
428 | |
429 /* find first point >= hash */ | |
430 | |
431 point = &points->point[0]; | |
432 | |
433 i = 0; | |
434 j = points->number; | |
435 | |
436 while (i < j) { | |
437 k = (i + j) / 2; | |
438 | |
439 if (hash > point[k].hash) { | |
440 i = k + 1; | |
441 | |
442 } else if (hash < point[k].hash) { | |
443 j = k; | |
444 | |
445 } else { | |
446 return k; | |
447 } | |
448 } | |
449 | |
450 return i; | |
451 } | |
452 | |
453 | |
454 static ngx_int_t | |
455 ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, | |
456 ngx_stream_upstream_srv_conf_t *us) | |
457 { | |
458 uint32_t hash; | |
459 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
460 ngx_stream_upstream_hash_peer_data_t *hp; | |
461 | |
462 if (ngx_stream_upstream_init_hash_peer(s, us) != NGX_OK) { | |
463 return NGX_ERROR; | |
464 } | |
465 | |
466 s->upstream->peer.get = ngx_stream_upstream_get_chash_peer; | |
467 | |
468 hp = s->upstream->peer.data; | |
469 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
470 ngx_stream_upstream_hash_module); | |
471 | |
472 hash = ngx_crc32_long(hp->key.data, hp->key.len); | |
473 | |
474 ngx_stream_upstream_rr_peers_rlock(hp->rrp.peers); | |
475 | |
476 hp->hash = ngx_stream_upstream_find_chash_point(hcf->points, hash); | |
477 | |
478 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
479 | |
480 return NGX_OK; | |
481 } | |
482 | |
483 | |
484 static ngx_int_t | |
485 ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, void *data) | |
486 { | |
487 ngx_stream_upstream_hash_peer_data_t *hp = data; | |
488 | |
489 time_t now; | |
490 intptr_t m; | |
491 ngx_str_t *server; | |
492 ngx_int_t total; | |
493 ngx_uint_t i, n, best_i; | |
494 ngx_stream_upstream_rr_peer_t *peer, *best; | |
495 ngx_stream_upstream_chash_point_t *point; | |
496 ngx_stream_upstream_chash_points_t *points; | |
497 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
498 | |
499 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
500 "get consistent hash peer, try: %ui", pc->tries); | |
501 | |
502 ngx_stream_upstream_rr_peers_wlock(hp->rrp.peers); | |
503 | |
504 pc->connection = NULL; | |
505 | |
506 now = ngx_time(); | |
507 hcf = hp->conf; | |
508 | |
509 points = hcf->points; | |
510 point = &points->point[0]; | |
511 | |
512 for ( ;; ) { | |
513 server = point[hp->hash % points->number].server; | |
514 | |
515 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
516 "consistent hash peer:%uD, server:\"%V\"", | |
517 hp->hash, server); | |
518 | |
519 best = NULL; | |
520 best_i = 0; | |
521 total = 0; | |
522 | |
523 for (peer = hp->rrp.peers->peer, i = 0; | |
524 peer; | |
525 peer = peer->next, i++) | |
526 { | |
527 | |
528 n = i / (8 * sizeof(uintptr_t)); | |
529 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); | |
530 | |
531 if (hp->rrp.tried[n] & m) { | |
532 continue; | |
533 } | |
534 | |
535 if (peer->down) { | |
536 continue; | |
537 } | |
538 | |
539 if (peer->server.len != server->len | |
540 || ngx_strncmp(peer->server.data, server->data, server->len) | |
541 != 0) | |
542 { | |
543 continue; | |
544 } | |
545 | |
546 if (peer->max_fails | |
547 && peer->fails >= peer->max_fails | |
548 && now - peer->checked <= peer->fail_timeout) | |
549 { | |
550 continue; | |
551 } | |
552 | |
553 peer->current_weight += peer->effective_weight; | |
554 total += peer->effective_weight; | |
555 | |
556 if (peer->effective_weight < peer->weight) { | |
557 peer->effective_weight++; | |
558 } | |
559 | |
560 if (best == NULL || peer->current_weight > best->current_weight) { | |
561 best = peer; | |
562 best_i = i; | |
563 } | |
564 } | |
565 | |
566 if (best) { | |
567 best->current_weight -= total; | |
568 break; | |
569 } | |
570 | |
571 hp->hash++; | |
572 hp->tries++; | |
573 | |
574 if (hp->tries >= points->number) { | |
575 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
576 return NGX_BUSY; | |
577 } | |
578 } | |
579 | |
580 hp->rrp.current = best; | |
581 | |
582 pc->sockaddr = best->sockaddr; | |
583 pc->socklen = best->socklen; | |
584 pc->name = &best->name; | |
585 | |
586 best->conns++; | |
587 | |
588 if (now - best->checked > best->fail_timeout) { | |
589 best->checked = now; | |
590 } | |
591 | |
592 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
593 | |
594 n = best_i / (8 * sizeof(uintptr_t)); | |
595 m = (uintptr_t) 1 << best_i % (8 * sizeof(uintptr_t)); | |
596 | |
597 hp->rrp.tried[n] |= m; | |
598 | |
599 return NGX_OK; | |
600 } | |
601 | |
602 | |
603 static void * | |
604 ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf) | |
605 { | |
606 ngx_stream_upstream_hash_srv_conf_t *conf; | |
607 | |
608 conf = ngx_palloc(cf->pool, sizeof(ngx_stream_upstream_hash_srv_conf_t)); | |
609 if (conf == NULL) { | |
610 return NULL; | |
611 } | |
612 | |
613 conf->points = NULL; | |
614 | |
615 return conf; | |
616 } | |
617 | |
618 | |
619 static char * | |
620 ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
621 { | |
6610
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622 ngx_stream_upstream_hash_srv_conf_t *hcf = conf; |
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623 |
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624 ngx_str_t *value; |
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625 ngx_stream_upstream_srv_conf_t *uscf; |
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626 ngx_stream_compile_complex_value_t ccv; |
6115 | 627 |
628 value = cf->args->elts; | |
629 | |
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630 ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); |
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631 |
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632 ccv.cf = cf; |
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633 ccv.value = &value[1]; |
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634 ccv.complex_value = &hcf->key; |
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635 |
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636 if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { |
6115 | 637 return NGX_CONF_ERROR; |
638 } | |
639 | |
640 uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module); | |
641 | |
642 if (uscf->peer.init_upstream) { | |
643 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, | |
644 "load balancing method redefined"); | |
645 } | |
646 | |
647 uscf->flags = NGX_STREAM_UPSTREAM_CREATE | |
648 |NGX_STREAM_UPSTREAM_WEIGHT | |
649 |NGX_STREAM_UPSTREAM_MAX_FAILS | |
650 |NGX_STREAM_UPSTREAM_FAIL_TIMEOUT | |
651 |NGX_STREAM_UPSTREAM_DOWN; | |
652 | |
653 if (cf->args->nelts == 2) { | |
654 uscf->peer.init_upstream = ngx_stream_upstream_init_hash; | |
655 | |
656 } else if (ngx_strcmp(value[2].data, "consistent") == 0) { | |
657 uscf->peer.init_upstream = ngx_stream_upstream_init_chash; | |
658 | |
659 } else { | |
660 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
661 "invalid parameter \"%V\"", &value[2]); | |
662 return NGX_CONF_ERROR; | |
663 } | |
664 | |
665 return NGX_CONF_OK; | |
666 } |