Mercurial > hg > nginx-quic
annotate src/stream/ngx_stream_upstream_hash_module.c @ 6565:3af0e65a461a
Realip: detect duplicate real_ip_header directive.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Mon, 23 May 2016 19:17:24 +0300 |
parents | 68c106e6fa0a |
children | 2f41d383c9c7 |
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 { | |
26 ngx_stream_upstream_chash_points_t *points; | |
27 } ngx_stream_upstream_hash_srv_conf_t; | |
28 | |
29 | |
30 typedef struct { | |
31 /* the round robin data must be first */ | |
32 ngx_stream_upstream_rr_peer_data_t rrp; | |
33 ngx_stream_upstream_hash_srv_conf_t *conf; | |
34 ngx_str_t key; | |
35 ngx_uint_t tries; | |
36 ngx_uint_t rehash; | |
37 uint32_t hash; | |
38 ngx_event_get_peer_pt get_rr_peer; | |
39 } ngx_stream_upstream_hash_peer_data_t; | |
40 | |
41 | |
42 static ngx_int_t ngx_stream_upstream_init_hash(ngx_conf_t *cf, | |
43 ngx_stream_upstream_srv_conf_t *us); | |
44 static ngx_int_t ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, | |
45 ngx_stream_upstream_srv_conf_t *us); | |
46 static ngx_int_t ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, | |
47 void *data); | |
48 | |
49 static ngx_int_t ngx_stream_upstream_init_chash(ngx_conf_t *cf, | |
50 ngx_stream_upstream_srv_conf_t *us); | |
51 static int ngx_libc_cdecl | |
52 ngx_stream_upstream_chash_cmp_points(const void *one, const void *two); | |
53 static ngx_uint_t ngx_stream_upstream_find_chash_point( | |
54 ngx_stream_upstream_chash_points_t *points, uint32_t hash); | |
55 static ngx_int_t ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, | |
56 ngx_stream_upstream_srv_conf_t *us); | |
57 static ngx_int_t ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, | |
58 void *data); | |
59 | |
60 static void *ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf); | |
61 static char *ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, | |
62 void *conf); | |
63 | |
64 | |
65 static ngx_command_t ngx_stream_upstream_hash_commands[] = { | |
66 | |
67 { ngx_string("hash"), | |
68 NGX_STREAM_UPS_CONF|NGX_CONF_TAKE12, | |
69 ngx_stream_upstream_hash, | |
70 NGX_STREAM_SRV_CONF_OFFSET, | |
71 0, | |
72 NULL }, | |
73 | |
74 ngx_null_command | |
75 }; | |
76 | |
77 | |
78 static ngx_stream_module_t ngx_stream_upstream_hash_module_ctx = { | |
6174
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Stream: added postconfiguration method to stream modules.
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6148
diff
changeset
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79 NULL, /* postconfiguration */ |
68c106e6fa0a
Stream: added postconfiguration method to stream modules.
Vladimir Homutov <vl@nginx.com>
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80 |
6115 | 81 NULL, /* create main configuration */ |
82 NULL, /* init main configuration */ | |
83 | |
84 ngx_stream_upstream_hash_create_conf, /* create server configuration */ | |
85 NULL, /* merge server configuration */ | |
86 }; | |
87 | |
88 | |
89 ngx_module_t ngx_stream_upstream_hash_module = { | |
90 NGX_MODULE_V1, | |
91 &ngx_stream_upstream_hash_module_ctx, /* module context */ | |
92 ngx_stream_upstream_hash_commands, /* module directives */ | |
93 NGX_STREAM_MODULE, /* module type */ | |
94 NULL, /* init master */ | |
95 NULL, /* init module */ | |
96 NULL, /* init process */ | |
97 NULL, /* init thread */ | |
98 NULL, /* exit thread */ | |
99 NULL, /* exit process */ | |
100 NULL, /* exit master */ | |
101 NGX_MODULE_V1_PADDING | |
102 }; | |
103 | |
104 | |
105 static ngx_int_t | |
106 ngx_stream_upstream_init_hash(ngx_conf_t *cf, | |
107 ngx_stream_upstream_srv_conf_t *us) | |
108 { | |
109 if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { | |
110 return NGX_ERROR; | |
111 } | |
112 | |
113 us->peer.init = ngx_stream_upstream_init_hash_peer; | |
114 | |
115 return NGX_OK; | |
116 } | |
117 | |
118 | |
119 static ngx_int_t | |
120 ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, | |
121 ngx_stream_upstream_srv_conf_t *us) | |
122 { | |
123 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
124 ngx_stream_upstream_hash_peer_data_t *hp; | |
125 | |
126 hp = ngx_palloc(s->connection->pool, | |
127 sizeof(ngx_stream_upstream_hash_peer_data_t)); | |
128 if (hp == NULL) { | |
129 return NGX_ERROR; | |
130 } | |
131 | |
132 s->upstream->peer.data = &hp->rrp; | |
133 | |
134 if (ngx_stream_upstream_init_round_robin_peer(s, us) != NGX_OK) { | |
135 return NGX_ERROR; | |
136 } | |
137 | |
138 s->upstream->peer.get = ngx_stream_upstream_get_hash_peer; | |
139 | |
140 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
141 ngx_stream_upstream_hash_module); | |
142 | |
143 hp->key = s->connection->addr_text; | |
144 | |
145 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, | |
146 "upstream hash key:\"%V\"", &hp->key); | |
147 | |
148 hp->conf = hcf; | |
149 hp->tries = 0; | |
150 hp->rehash = 0; | |
151 hp->hash = 0; | |
152 hp->get_rr_peer = ngx_stream_upstream_get_round_robin_peer; | |
153 | |
154 return NGX_OK; | |
155 } | |
156 | |
157 | |
158 static ngx_int_t | |
159 ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, void *data) | |
160 { | |
161 ngx_stream_upstream_hash_peer_data_t *hp = data; | |
162 | |
163 time_t now; | |
164 u_char buf[NGX_INT_T_LEN]; | |
165 size_t size; | |
166 uint32_t hash; | |
167 ngx_int_t w; | |
168 uintptr_t m; | |
6121
b6047abf5f30
Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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169 ngx_uint_t n, p; |
6115 | 170 ngx_stream_upstream_rr_peer_t *peer; |
171 | |
172 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
173 "get hash peer, try: %ui", pc->tries); | |
174 | |
175 ngx_stream_upstream_rr_peers_wlock(hp->rrp.peers); | |
176 | |
177 if (hp->tries > 20 || hp->rrp.peers->single) { | |
178 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
179 return hp->get_rr_peer(pc, &hp->rrp); | |
180 } | |
181 | |
182 now = ngx_time(); | |
183 | |
184 pc->connection = NULL; | |
185 | |
186 for ( ;; ) { | |
187 | |
188 /* | |
189 * Hash expression is compatible with Cache::Memcached: | |
190 * ((crc32([REHASH] KEY) >> 16) & 0x7fff) + PREV_HASH | |
191 * with REHASH omitted at the first iteration. | |
192 */ | |
193 | |
194 ngx_crc32_init(hash); | |
195 | |
196 if (hp->rehash > 0) { | |
197 size = ngx_sprintf(buf, "%ui", hp->rehash) - buf; | |
198 ngx_crc32_update(&hash, buf, size); | |
199 } | |
200 | |
201 ngx_crc32_update(&hash, hp->key.data, hp->key.len); | |
202 ngx_crc32_final(hash); | |
203 | |
204 hash = (hash >> 16) & 0x7fff; | |
205 | |
206 hp->hash += hash; | |
207 hp->rehash++; | |
208 | |
6121
b6047abf5f30
Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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209 w = hp->hash % hp->rrp.peers->total_weight; |
b6047abf5f30
Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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210 peer = hp->rrp.peers->peer; |
b6047abf5f30
Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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211 p = 0; |
6115 | 212 |
6121
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Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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213 while (w >= peer->weight) { |
b6047abf5f30
Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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214 w -= peer->weight; |
b6047abf5f30
Upstream: simplified ip_hash and hash peer selection code.
Ruslan Ermilov <ru@nginx.com>
parents:
6115
diff
changeset
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215 peer = peer->next; |
b6047abf5f30
Upstream: simplified ip_hash and hash peer selection code.
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parents:
6115
diff
changeset
|
216 p++; |
6115 | 217 } |
218 | |
219 n = p / (8 * sizeof(uintptr_t)); | |
220 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); | |
221 | |
222 if (hp->rrp.tried[n] & m) { | |
223 goto next; | |
224 } | |
225 | |
226 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
227 "get hash peer, value:%uD, peer:%ui", hp->hash, p); | |
228 | |
229 if (peer->down) { | |
230 goto next; | |
231 } | |
232 | |
233 if (peer->max_fails | |
234 && peer->fails >= peer->max_fails | |
235 && now - peer->checked <= peer->fail_timeout) | |
236 { | |
237 goto next; | |
238 } | |
239 | |
240 break; | |
241 | |
242 next: | |
243 | |
244 if (++hp->tries > 20) { | |
245 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
246 return hp->get_rr_peer(pc, &hp->rrp); | |
247 } | |
248 } | |
249 | |
250 hp->rrp.current = peer; | |
251 | |
252 pc->sockaddr = peer->sockaddr; | |
253 pc->socklen = peer->socklen; | |
254 pc->name = &peer->name; | |
255 | |
256 peer->conns++; | |
257 | |
258 if (now - peer->checked > peer->fail_timeout) { | |
259 peer->checked = now; | |
260 } | |
261 | |
262 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
263 | |
264 hp->rrp.tried[n] |= m; | |
265 | |
266 return NGX_OK; | |
267 } | |
268 | |
269 | |
270 static ngx_int_t | |
271 ngx_stream_upstream_init_chash(ngx_conf_t *cf, | |
272 ngx_stream_upstream_srv_conf_t *us) | |
273 { | |
274 u_char *host, *port, c; | |
275 size_t host_len, port_len, size; | |
6148
bf8b6534db3a
Upstream hash: consistency across little/big endianness.
Sergey Kandaurov <pluknet@nginx.com>
parents:
6121
diff
changeset
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276 uint32_t hash, base_hash; |
6115 | 277 ngx_str_t *server; |
278 ngx_uint_t npoints, i, j; | |
279 ngx_stream_upstream_rr_peer_t *peer; | |
280 ngx_stream_upstream_rr_peers_t *peers; | |
281 ngx_stream_upstream_chash_points_t *points; | |
282 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
6148
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Upstream hash: consistency across little/big endianness.
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parents:
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283 union { |
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284 uint32_t value; |
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285 u_char byte[4]; |
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Upstream hash: consistency across little/big endianness.
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286 } prev_hash; |
6115 | 287 |
288 if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { | |
289 return NGX_ERROR; | |
290 } | |
291 | |
292 us->peer.init = ngx_stream_upstream_init_chash_peer; | |
293 | |
294 peers = us->peer.data; | |
295 npoints = peers->total_weight * 160; | |
296 | |
297 size = sizeof(ngx_stream_upstream_chash_points_t) | |
298 + sizeof(ngx_stream_upstream_chash_point_t) * (npoints - 1); | |
299 | |
300 points = ngx_palloc(cf->pool, size); | |
301 if (points == NULL) { | |
302 return NGX_ERROR; | |
303 } | |
304 | |
305 points->number = 0; | |
306 | |
307 for (peer = peers->peer; peer; peer = peer->next) { | |
308 server = &peer->server; | |
309 | |
310 /* | |
311 * Hash expression is compatible with Cache::Memcached::Fast: | |
312 * crc32(HOST \0 PORT PREV_HASH). | |
313 */ | |
314 | |
315 if (server->len >= 5 | |
316 && ngx_strncasecmp(server->data, (u_char *) "unix:", 5) == 0) | |
317 { | |
318 host = server->data + 5; | |
319 host_len = server->len - 5; | |
320 port = NULL; | |
321 port_len = 0; | |
322 goto done; | |
323 } | |
324 | |
325 for (j = 0; j < server->len; j++) { | |
326 c = server->data[server->len - j - 1]; | |
327 | |
328 if (c == ':') { | |
329 host = server->data; | |
330 host_len = server->len - j - 1; | |
331 port = server->data + server->len - j; | |
332 port_len = j; | |
333 goto done; | |
334 } | |
335 | |
336 if (c < '0' || c > '9') { | |
337 break; | |
338 } | |
339 } | |
340 | |
341 host = server->data; | |
342 host_len = server->len; | |
343 port = NULL; | |
344 port_len = 0; | |
345 | |
346 done: | |
347 | |
348 ngx_crc32_init(base_hash); | |
349 ngx_crc32_update(&base_hash, host, host_len); | |
350 ngx_crc32_update(&base_hash, (u_char *) "", 1); | |
351 ngx_crc32_update(&base_hash, port, port_len); | |
352 | |
6148
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Upstream hash: consistency across little/big endianness.
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parents:
6121
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353 prev_hash.value = 0; |
6115 | 354 npoints = peer->weight * 160; |
355 | |
356 for (j = 0; j < npoints; j++) { | |
357 hash = base_hash; | |
358 | |
6148
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Upstream hash: consistency across little/big endianness.
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parents:
6121
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359 ngx_crc32_update(&hash, prev_hash.byte, 4); |
6115 | 360 ngx_crc32_final(hash); |
361 | |
362 points->point[points->number].hash = hash; | |
363 points->point[points->number].server = server; | |
364 points->number++; | |
365 | |
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366 #if (NGX_HAVE_LITTLE_ENDIAN) |
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367 prev_hash.value = hash; |
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368 #else |
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369 prev_hash.byte[0] = (u_char) (hash & 0xff); |
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parents:
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370 prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff); |
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parents:
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371 prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff); |
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parents:
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372 prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff); |
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parents:
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373 #endif |
6115 | 374 } |
375 } | |
376 | |
377 ngx_qsort(points->point, | |
378 points->number, | |
379 sizeof(ngx_stream_upstream_chash_point_t), | |
380 ngx_stream_upstream_chash_cmp_points); | |
381 | |
382 for (i = 0, j = 1; j < points->number; j++) { | |
383 if (points->point[i].hash != points->point[j].hash) { | |
384 points->point[++i] = points->point[j]; | |
385 } | |
386 } | |
387 | |
388 points->number = i + 1; | |
389 | |
390 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
391 ngx_stream_upstream_hash_module); | |
392 hcf->points = points; | |
393 | |
394 return NGX_OK; | |
395 } | |
396 | |
397 | |
398 static int ngx_libc_cdecl | |
399 ngx_stream_upstream_chash_cmp_points(const void *one, const void *two) | |
400 { | |
401 ngx_stream_upstream_chash_point_t *first = | |
402 (ngx_stream_upstream_chash_point_t *) one; | |
403 ngx_stream_upstream_chash_point_t *second = | |
404 (ngx_stream_upstream_chash_point_t *) two; | |
405 | |
406 if (first->hash < second->hash) { | |
407 return -1; | |
408 | |
409 } else if (first->hash > second->hash) { | |
410 return 1; | |
411 | |
412 } else { | |
413 return 0; | |
414 } | |
415 } | |
416 | |
417 | |
418 static ngx_uint_t | |
419 ngx_stream_upstream_find_chash_point(ngx_stream_upstream_chash_points_t *points, | |
420 uint32_t hash) | |
421 { | |
422 ngx_uint_t i, j, k; | |
423 ngx_stream_upstream_chash_point_t *point; | |
424 | |
425 /* find first point >= hash */ | |
426 | |
427 point = &points->point[0]; | |
428 | |
429 i = 0; | |
430 j = points->number; | |
431 | |
432 while (i < j) { | |
433 k = (i + j) / 2; | |
434 | |
435 if (hash > point[k].hash) { | |
436 i = k + 1; | |
437 | |
438 } else if (hash < point[k].hash) { | |
439 j = k; | |
440 | |
441 } else { | |
442 return k; | |
443 } | |
444 } | |
445 | |
446 return i; | |
447 } | |
448 | |
449 | |
450 static ngx_int_t | |
451 ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, | |
452 ngx_stream_upstream_srv_conf_t *us) | |
453 { | |
454 uint32_t hash; | |
455 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
456 ngx_stream_upstream_hash_peer_data_t *hp; | |
457 | |
458 if (ngx_stream_upstream_init_hash_peer(s, us) != NGX_OK) { | |
459 return NGX_ERROR; | |
460 } | |
461 | |
462 s->upstream->peer.get = ngx_stream_upstream_get_chash_peer; | |
463 | |
464 hp = s->upstream->peer.data; | |
465 hcf = ngx_stream_conf_upstream_srv_conf(us, | |
466 ngx_stream_upstream_hash_module); | |
467 | |
468 hash = ngx_crc32_long(hp->key.data, hp->key.len); | |
469 | |
470 ngx_stream_upstream_rr_peers_rlock(hp->rrp.peers); | |
471 | |
472 hp->hash = ngx_stream_upstream_find_chash_point(hcf->points, hash); | |
473 | |
474 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
475 | |
476 return NGX_OK; | |
477 } | |
478 | |
479 | |
480 static ngx_int_t | |
481 ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, void *data) | |
482 { | |
483 ngx_stream_upstream_hash_peer_data_t *hp = data; | |
484 | |
485 time_t now; | |
486 intptr_t m; | |
487 ngx_str_t *server; | |
488 ngx_int_t total; | |
489 ngx_uint_t i, n, best_i; | |
490 ngx_stream_upstream_rr_peer_t *peer, *best; | |
491 ngx_stream_upstream_chash_point_t *point; | |
492 ngx_stream_upstream_chash_points_t *points; | |
493 ngx_stream_upstream_hash_srv_conf_t *hcf; | |
494 | |
495 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
496 "get consistent hash peer, try: %ui", pc->tries); | |
497 | |
498 ngx_stream_upstream_rr_peers_wlock(hp->rrp.peers); | |
499 | |
500 pc->connection = NULL; | |
501 | |
502 now = ngx_time(); | |
503 hcf = hp->conf; | |
504 | |
505 points = hcf->points; | |
506 point = &points->point[0]; | |
507 | |
508 for ( ;; ) { | |
509 server = point[hp->hash % points->number].server; | |
510 | |
511 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, | |
512 "consistent hash peer:%uD, server:\"%V\"", | |
513 hp->hash, server); | |
514 | |
515 best = NULL; | |
516 best_i = 0; | |
517 total = 0; | |
518 | |
519 for (peer = hp->rrp.peers->peer, i = 0; | |
520 peer; | |
521 peer = peer->next, i++) | |
522 { | |
523 | |
524 n = i / (8 * sizeof(uintptr_t)); | |
525 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); | |
526 | |
527 if (hp->rrp.tried[n] & m) { | |
528 continue; | |
529 } | |
530 | |
531 if (peer->down) { | |
532 continue; | |
533 } | |
534 | |
535 if (peer->server.len != server->len | |
536 || ngx_strncmp(peer->server.data, server->data, server->len) | |
537 != 0) | |
538 { | |
539 continue; | |
540 } | |
541 | |
542 if (peer->max_fails | |
543 && peer->fails >= peer->max_fails | |
544 && now - peer->checked <= peer->fail_timeout) | |
545 { | |
546 continue; | |
547 } | |
548 | |
549 peer->current_weight += peer->effective_weight; | |
550 total += peer->effective_weight; | |
551 | |
552 if (peer->effective_weight < peer->weight) { | |
553 peer->effective_weight++; | |
554 } | |
555 | |
556 if (best == NULL || peer->current_weight > best->current_weight) { | |
557 best = peer; | |
558 best_i = i; | |
559 } | |
560 } | |
561 | |
562 if (best) { | |
563 best->current_weight -= total; | |
564 break; | |
565 } | |
566 | |
567 hp->hash++; | |
568 hp->tries++; | |
569 | |
570 if (hp->tries >= points->number) { | |
571 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
572 return NGX_BUSY; | |
573 } | |
574 } | |
575 | |
576 hp->rrp.current = best; | |
577 | |
578 pc->sockaddr = best->sockaddr; | |
579 pc->socklen = best->socklen; | |
580 pc->name = &best->name; | |
581 | |
582 best->conns++; | |
583 | |
584 if (now - best->checked > best->fail_timeout) { | |
585 best->checked = now; | |
586 } | |
587 | |
588 ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); | |
589 | |
590 n = best_i / (8 * sizeof(uintptr_t)); | |
591 m = (uintptr_t) 1 << best_i % (8 * sizeof(uintptr_t)); | |
592 | |
593 hp->rrp.tried[n] |= m; | |
594 | |
595 return NGX_OK; | |
596 } | |
597 | |
598 | |
599 static void * | |
600 ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf) | |
601 { | |
602 ngx_stream_upstream_hash_srv_conf_t *conf; | |
603 | |
604 conf = ngx_palloc(cf->pool, sizeof(ngx_stream_upstream_hash_srv_conf_t)); | |
605 if (conf == NULL) { | |
606 return NULL; | |
607 } | |
608 | |
609 conf->points = NULL; | |
610 | |
611 return conf; | |
612 } | |
613 | |
614 | |
615 static char * | |
616 ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
617 { | |
618 ngx_str_t *value; | |
619 ngx_stream_upstream_srv_conf_t *uscf; | |
620 | |
621 value = cf->args->elts; | |
622 | |
623 if (ngx_strcmp(value[1].data, "$remote_addr")) { | |
624 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
625 "unsupported hash key \"%V\", use $remote_addr", | |
626 &value[1]); | |
627 return NGX_CONF_ERROR; | |
628 } | |
629 | |
630 uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module); | |
631 | |
632 if (uscf->peer.init_upstream) { | |
633 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, | |
634 "load balancing method redefined"); | |
635 } | |
636 | |
637 uscf->flags = NGX_STREAM_UPSTREAM_CREATE | |
638 |NGX_STREAM_UPSTREAM_WEIGHT | |
639 |NGX_STREAM_UPSTREAM_MAX_FAILS | |
640 |NGX_STREAM_UPSTREAM_FAIL_TIMEOUT | |
641 |NGX_STREAM_UPSTREAM_DOWN; | |
642 | |
643 if (cf->args->nelts == 2) { | |
644 uscf->peer.init_upstream = ngx_stream_upstream_init_hash; | |
645 | |
646 } else if (ngx_strcmp(value[2].data, "consistent") == 0) { | |
647 uscf->peer.init_upstream = ngx_stream_upstream_init_chash; | |
648 | |
649 } else { | |
650 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
651 "invalid parameter \"%V\"", &value[2]); | |
652 return NGX_CONF_ERROR; | |
653 } | |
654 | |
655 return NGX_CONF_OK; | |
656 } |