Mercurial > hg > nginx
view src/stream/ngx_stream_upstream_hash_module.c @ 6694:ea9dfe2f62e7
Stream: preread phase.
In this phase, head of a stream is read and analysed before proceeding to the
content phase. Amount of data read is controlled by the module implementing
the phase, but not more than defined by the "preread_buffer_size" directive.
The time spent on processing preread is controlled by the "preread_timeout"
directive.
The typical preread phase module will parse the beginning of a stream and set
variable that may be used by the content phase, for example to make routing
decision.
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Thu, 15 Sep 2016 14:56:02 +0300 |
parents | 8ed51b02f655 |
children | 52367732bcbc |
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/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_stream.h> typedef struct { uint32_t hash; ngx_str_t *server; } ngx_stream_upstream_chash_point_t; typedef struct { ngx_uint_t number; ngx_stream_upstream_chash_point_t point[1]; } ngx_stream_upstream_chash_points_t; typedef struct { ngx_stream_complex_value_t key; ngx_stream_upstream_chash_points_t *points; } ngx_stream_upstream_hash_srv_conf_t; typedef struct { /* the round robin data must be first */ ngx_stream_upstream_rr_peer_data_t rrp; ngx_stream_upstream_hash_srv_conf_t *conf; ngx_str_t key; ngx_uint_t tries; ngx_uint_t rehash; uint32_t hash; ngx_event_get_peer_pt get_rr_peer; } ngx_stream_upstream_hash_peer_data_t; static ngx_int_t ngx_stream_upstream_init_hash(ngx_conf_t *cf, ngx_stream_upstream_srv_conf_t *us); static ngx_int_t ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, ngx_stream_upstream_srv_conf_t *us); static ngx_int_t ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, void *data); static ngx_int_t ngx_stream_upstream_init_chash(ngx_conf_t *cf, ngx_stream_upstream_srv_conf_t *us); static int ngx_libc_cdecl ngx_stream_upstream_chash_cmp_points(const void *one, const void *two); static ngx_uint_t ngx_stream_upstream_find_chash_point( ngx_stream_upstream_chash_points_t *points, uint32_t hash); static ngx_int_t ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, ngx_stream_upstream_srv_conf_t *us); static ngx_int_t ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, void *data); static void *ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf); static char *ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static ngx_command_t ngx_stream_upstream_hash_commands[] = { { ngx_string("hash"), NGX_STREAM_UPS_CONF|NGX_CONF_TAKE12, ngx_stream_upstream_hash, NGX_STREAM_SRV_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_stream_module_t ngx_stream_upstream_hash_module_ctx = { NULL, /* preconfiguration */ NULL, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ ngx_stream_upstream_hash_create_conf, /* create server configuration */ NULL /* merge server configuration */ }; ngx_module_t ngx_stream_upstream_hash_module = { NGX_MODULE_V1, &ngx_stream_upstream_hash_module_ctx, /* module context */ ngx_stream_upstream_hash_commands, /* module directives */ NGX_STREAM_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_int_t ngx_stream_upstream_init_hash(ngx_conf_t *cf, ngx_stream_upstream_srv_conf_t *us) { if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { return NGX_ERROR; } us->peer.init = ngx_stream_upstream_init_hash_peer; return NGX_OK; } static ngx_int_t ngx_stream_upstream_init_hash_peer(ngx_stream_session_t *s, ngx_stream_upstream_srv_conf_t *us) { ngx_stream_upstream_hash_srv_conf_t *hcf; ngx_stream_upstream_hash_peer_data_t *hp; hp = ngx_palloc(s->connection->pool, sizeof(ngx_stream_upstream_hash_peer_data_t)); if (hp == NULL) { return NGX_ERROR; } s->upstream->peer.data = &hp->rrp; if (ngx_stream_upstream_init_round_robin_peer(s, us) != NGX_OK) { return NGX_ERROR; } s->upstream->peer.get = ngx_stream_upstream_get_hash_peer; hcf = ngx_stream_conf_upstream_srv_conf(us, ngx_stream_upstream_hash_module); if (ngx_stream_complex_value(s, &hcf->key, &hp->key) != NGX_OK) { return NGX_ERROR; } ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, "upstream hash key:\"%V\"", &hp->key); hp->conf = hcf; hp->tries = 0; hp->rehash = 0; hp->hash = 0; hp->get_rr_peer = ngx_stream_upstream_get_round_robin_peer; return NGX_OK; } static ngx_int_t ngx_stream_upstream_get_hash_peer(ngx_peer_connection_t *pc, void *data) { ngx_stream_upstream_hash_peer_data_t *hp = data; time_t now; u_char buf[NGX_INT_T_LEN]; size_t size; uint32_t hash; ngx_int_t w; uintptr_t m; ngx_uint_t n, p; ngx_stream_upstream_rr_peer_t *peer; ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, "get hash peer, try: %ui", pc->tries); ngx_stream_upstream_rr_peers_wlock(hp->rrp.peers); if (hp->tries > 20 || hp->rrp.peers->single) { ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); return hp->get_rr_peer(pc, &hp->rrp); } now = ngx_time(); pc->connection = NULL; for ( ;; ) { /* * Hash expression is compatible with Cache::Memcached: * ((crc32([REHASH] KEY) >> 16) & 0x7fff) + PREV_HASH * with REHASH omitted at the first iteration. */ ngx_crc32_init(hash); if (hp->rehash > 0) { size = ngx_sprintf(buf, "%ui", hp->rehash) - buf; ngx_crc32_update(&hash, buf, size); } ngx_crc32_update(&hash, hp->key.data, hp->key.len); ngx_crc32_final(hash); hash = (hash >> 16) & 0x7fff; hp->hash += hash; hp->rehash++; w = hp->hash % hp->rrp.peers->total_weight; peer = hp->rrp.peers->peer; p = 0; while (w >= peer->weight) { w -= peer->weight; peer = peer->next; p++; } n = p / (8 * sizeof(uintptr_t)); m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); if (hp->rrp.tried[n] & m) { goto next; } ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, "get hash peer, value:%uD, peer:%ui", hp->hash, p); if (peer->down) { goto next; } if (peer->max_fails && peer->fails >= peer->max_fails && now - peer->checked <= peer->fail_timeout) { goto next; } break; next: if (++hp->tries > 20) { ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); return hp->get_rr_peer(pc, &hp->rrp); } } hp->rrp.current = peer; pc->sockaddr = peer->sockaddr; pc->socklen = peer->socklen; pc->name = &peer->name; peer->conns++; if (now - peer->checked > peer->fail_timeout) { peer->checked = now; } ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); hp->rrp.tried[n] |= m; return NGX_OK; } static ngx_int_t ngx_stream_upstream_init_chash(ngx_conf_t *cf, ngx_stream_upstream_srv_conf_t *us) { u_char *host, *port, c; size_t host_len, port_len, size; uint32_t hash, base_hash; ngx_str_t *server; ngx_uint_t npoints, i, j; ngx_stream_upstream_rr_peer_t *peer; ngx_stream_upstream_rr_peers_t *peers; ngx_stream_upstream_chash_points_t *points; ngx_stream_upstream_hash_srv_conf_t *hcf; union { uint32_t value; u_char byte[4]; } prev_hash; if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) { return NGX_ERROR; } us->peer.init = ngx_stream_upstream_init_chash_peer; peers = us->peer.data; npoints = peers->total_weight * 160; size = sizeof(ngx_stream_upstream_chash_points_t) + sizeof(ngx_stream_upstream_chash_point_t) * (npoints - 1); points = ngx_palloc(cf->pool, size); if (points == NULL) { return NGX_ERROR; } points->number = 0; for (peer = peers->peer; peer; peer = peer->next) { server = &peer->server; /* * Hash expression is compatible with Cache::Memcached::Fast: * crc32(HOST \0 PORT PREV_HASH). */ if (server->len >= 5 && ngx_strncasecmp(server->data, (u_char *) "unix:", 5) == 0) { host = server->data + 5; host_len = server->len - 5; port = NULL; port_len = 0; goto done; } for (j = 0; j < server->len; j++) { c = server->data[server->len - j - 1]; if (c == ':') { host = server->data; host_len = server->len - j - 1; port = server->data + server->len - j; port_len = j; goto done; } if (c < '0' || c > '9') { break; } } host = server->data; host_len = server->len; port = NULL; port_len = 0; done: ngx_crc32_init(base_hash); ngx_crc32_update(&base_hash, host, host_len); ngx_crc32_update(&base_hash, (u_char *) "", 1); ngx_crc32_update(&base_hash, port, port_len); prev_hash.value = 0; npoints = peer->weight * 160; for (j = 0; j < npoints; j++) { hash = base_hash; ngx_crc32_update(&hash, prev_hash.byte, 4); ngx_crc32_final(hash); points->point[points->number].hash = hash; points->point[points->number].server = server; points->number++; #if (NGX_HAVE_LITTLE_ENDIAN) prev_hash.value = hash; #else prev_hash.byte[0] = (u_char) (hash & 0xff); prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff); prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff); prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff); #endif } } ngx_qsort(points->point, points->number, sizeof(ngx_stream_upstream_chash_point_t), ngx_stream_upstream_chash_cmp_points); for (i = 0, j = 1; j < points->number; j++) { if (points->point[i].hash != points->point[j].hash) { points->point[++i] = points->point[j]; } } points->number = i + 1; hcf = ngx_stream_conf_upstream_srv_conf(us, ngx_stream_upstream_hash_module); hcf->points = points; return NGX_OK; } static int ngx_libc_cdecl ngx_stream_upstream_chash_cmp_points(const void *one, const void *two) { ngx_stream_upstream_chash_point_t *first = (ngx_stream_upstream_chash_point_t *) one; ngx_stream_upstream_chash_point_t *second = (ngx_stream_upstream_chash_point_t *) two; if (first->hash < second->hash) { return -1; } else if (first->hash > second->hash) { return 1; } else { return 0; } } static ngx_uint_t ngx_stream_upstream_find_chash_point(ngx_stream_upstream_chash_points_t *points, uint32_t hash) { ngx_uint_t i, j, k; ngx_stream_upstream_chash_point_t *point; /* find first point >= hash */ point = &points->point[0]; i = 0; j = points->number; while (i < j) { k = (i + j) / 2; if (hash > point[k].hash) { i = k + 1; } else if (hash < point[k].hash) { j = k; } else { return k; } } return i; } static ngx_int_t ngx_stream_upstream_init_chash_peer(ngx_stream_session_t *s, ngx_stream_upstream_srv_conf_t *us) { uint32_t hash; ngx_stream_upstream_hash_srv_conf_t *hcf; ngx_stream_upstream_hash_peer_data_t *hp; if (ngx_stream_upstream_init_hash_peer(s, us) != NGX_OK) { return NGX_ERROR; } s->upstream->peer.get = ngx_stream_upstream_get_chash_peer; hp = s->upstream->peer.data; hcf = ngx_stream_conf_upstream_srv_conf(us, ngx_stream_upstream_hash_module); hash = ngx_crc32_long(hp->key.data, hp->key.len); ngx_stream_upstream_rr_peers_rlock(hp->rrp.peers); hp->hash = ngx_stream_upstream_find_chash_point(hcf->points, hash); ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); return NGX_OK; } static ngx_int_t ngx_stream_upstream_get_chash_peer(ngx_peer_connection_t *pc, void *data) { ngx_stream_upstream_hash_peer_data_t *hp = data; time_t now; intptr_t m; ngx_str_t *server; ngx_int_t total; ngx_uint_t i, n, best_i; ngx_stream_upstream_rr_peer_t *peer, *best; ngx_stream_upstream_chash_point_t *point; ngx_stream_upstream_chash_points_t *points; ngx_stream_upstream_hash_srv_conf_t *hcf; ngx_log_debug1(NGX_LOG_DEBUG_STREAM, pc->log, 0, "get consistent hash peer, try: %ui", pc->tries); ngx_stream_upstream_rr_peers_wlock(hp->rrp.peers); pc->connection = NULL; now = ngx_time(); hcf = hp->conf; points = hcf->points; point = &points->point[0]; for ( ;; ) { server = point[hp->hash % points->number].server; ngx_log_debug2(NGX_LOG_DEBUG_STREAM, pc->log, 0, "consistent hash peer:%uD, server:\"%V\"", hp->hash, server); best = NULL; best_i = 0; total = 0; for (peer = hp->rrp.peers->peer, i = 0; peer; peer = peer->next, i++) { n = i / (8 * sizeof(uintptr_t)); m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t)); if (hp->rrp.tried[n] & m) { continue; } if (peer->down) { continue; } if (peer->server.len != server->len || ngx_strncmp(peer->server.data, server->data, server->len) != 0) { continue; } if (peer->max_fails && peer->fails >= peer->max_fails && now - peer->checked <= peer->fail_timeout) { continue; } peer->current_weight += peer->effective_weight; total += peer->effective_weight; if (peer->effective_weight < peer->weight) { peer->effective_weight++; } if (best == NULL || peer->current_weight > best->current_weight) { best = peer; best_i = i; } } if (best) { best->current_weight -= total; break; } hp->hash++; hp->tries++; if (hp->tries >= points->number) { ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); return NGX_BUSY; } } hp->rrp.current = best; pc->sockaddr = best->sockaddr; pc->socklen = best->socklen; pc->name = &best->name; best->conns++; if (now - best->checked > best->fail_timeout) { best->checked = now; } ngx_stream_upstream_rr_peers_unlock(hp->rrp.peers); n = best_i / (8 * sizeof(uintptr_t)); m = (uintptr_t) 1 << best_i % (8 * sizeof(uintptr_t)); hp->rrp.tried[n] |= m; return NGX_OK; } static void * ngx_stream_upstream_hash_create_conf(ngx_conf_t *cf) { ngx_stream_upstream_hash_srv_conf_t *conf; conf = ngx_palloc(cf->pool, sizeof(ngx_stream_upstream_hash_srv_conf_t)); if (conf == NULL) { return NULL; } conf->points = NULL; return conf; } static char * ngx_stream_upstream_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_stream_upstream_hash_srv_conf_t *hcf = conf; ngx_str_t *value; ngx_stream_upstream_srv_conf_t *uscf; ngx_stream_compile_complex_value_t ccv; value = cf->args->elts; ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); ccv.cf = cf; ccv.value = &value[1]; ccv.complex_value = &hcf->key; if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { return NGX_CONF_ERROR; } uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module); if (uscf->peer.init_upstream) { ngx_conf_log_error(NGX_LOG_WARN, cf, 0, "load balancing method redefined"); } uscf->flags = NGX_STREAM_UPSTREAM_CREATE |NGX_STREAM_UPSTREAM_WEIGHT |NGX_STREAM_UPSTREAM_MAX_FAILS |NGX_STREAM_UPSTREAM_FAIL_TIMEOUT |NGX_STREAM_UPSTREAM_DOWN; if (cf->args->nelts == 2) { uscf->peer.init_upstream = ngx_stream_upstream_init_hash; } else if (ngx_strcmp(value[2].data, "consistent") == 0) { uscf->peer.init_upstream = ngx_stream_upstream_init_chash; } else { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", &value[2]); return NGX_CONF_ERROR; } return NGX_CONF_OK; }