Mercurial > hg > nginx
annotate src/stream/ngx_stream_upstream_hash_module.c @ 6599:191e23214dfb
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| author | Roman Arutyunyan <arut@nginx.com> |
|---|---|
| date | Wed, 22 Jun 2016 11:50:02 +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 = { | |
|
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79 NULL, /* postconfiguration */ |
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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; | |
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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 | |
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parents:
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diff
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209 w = hp->hash % hp->rrp.peers->total_weight; |
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210 peer = hp->rrp.peers->peer; |
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Upstream: simplified ip_hash and hash peer selection code.
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parents:
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diff
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211 p = 0; |
| 6115 | 212 |
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Upstream: simplified ip_hash and hash peer selection code.
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parents:
6115
diff
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213 while (w >= peer->weight) { |
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Upstream: simplified ip_hash and hash peer selection code.
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parents:
6115
diff
changeset
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214 w -= peer->weight; |
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Upstream: simplified ip_hash and hash peer selection code.
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parents:
6115
diff
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215 peer = peer->next; |
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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; | |
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Upstream hash: consistency across little/big endianness.
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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; | |
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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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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 | |
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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 | |
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Upstream hash: consistency across little/big endianness.
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parents:
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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:
6121
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370 prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff); |
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Upstream hash: consistency across little/big endianness.
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parents:
6121
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changeset
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371 prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff); |
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parents:
6121
diff
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372 prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff); |
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parents:
6121
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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 } |