Mercurial > hg > nginx-quic
view src/http/ngx_http_upstream_round_robin.c @ 2379:7be1b347ba3e
release-0.7.25 tag
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Mon, 08 Dec 2008 14:43:17 +0000 |
parents | 70a2bcc7e307 |
children | 7af1e5fe102c |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> static ngx_int_t ngx_http_upstream_cmp_servers(const void *one, const void *two); static ngx_uint_t ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers); ngx_int_t ngx_http_upstream_init_round_robin(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us) { ngx_url_t u; ngx_uint_t i, j, n; ngx_http_upstream_server_t *server; ngx_http_upstream_rr_peers_t *peers, *backup; us->peer.init = ngx_http_upstream_init_round_robin_peer; if (us->servers) { server = us->servers->elts; n = 0; for (i = 0; i < us->servers->nelts; i++) { if (server[i].backup) { continue; } n += server[i].naddrs; } peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); if (peers == NULL) { return NGX_ERROR; } peers->single = (n == 1); peers->number = n; peers->name = &us->host; n = 0; for (i = 0; i < us->servers->nelts; i++) { for (j = 0; j < server[i].naddrs; j++) { if (server[i].backup) { continue; } peers->peer[n].sockaddr = server[i].addrs[j].sockaddr; peers->peer[n].socklen = server[i].addrs[j].socklen; peers->peer[n].name = server[i].addrs[j].name; peers->peer[n].max_fails = server[i].max_fails; peers->peer[n].fail_timeout = server[i].fail_timeout; peers->peer[n].down = server[i].down; peers->peer[n].weight = server[i].down ? 0 : server[i].weight; peers->peer[n].current_weight = peers->peer[n].weight; n++; } } us->peer.data = peers; ngx_sort(&peers->peer[0], (size_t) n, sizeof(ngx_http_upstream_rr_peer_t), ngx_http_upstream_cmp_servers); /* backup servers */ n = 0; for (i = 0; i < us->servers->nelts; i++) { if (!server[i].backup) { continue; } n += server[i].naddrs; } if (n == 0) { return NGX_OK; } backup = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); if (backup == NULL) { return NGX_ERROR; } peers->single = 0; backup->single = 0; backup->number = n; backup->name = &us->host; n = 0; for (i = 0; i < us->servers->nelts; i++) { for (j = 0; j < server[i].naddrs; j++) { if (!server[i].backup) { continue; } backup->peer[n].sockaddr = server[i].addrs[j].sockaddr; backup->peer[n].socklen = server[i].addrs[j].socklen; backup->peer[n].name = server[i].addrs[j].name; backup->peer[n].weight = server[i].weight; backup->peer[n].current_weight = server[i].weight; backup->peer[n].max_fails = server[i].max_fails; backup->peer[n].fail_timeout = server[i].fail_timeout; backup->peer[n].down = server[i].down; n++; } } peers->next = backup; ngx_sort(&backup->peer[0], (size_t) n, sizeof(ngx_http_upstream_rr_peer_t), ngx_http_upstream_cmp_servers); return NGX_OK; } /* an upstream implicitly defined by proxy_pass, etc. */ if (us->port == 0 && us->default_port == 0) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "no port in upstream \"%V\" in %s:%ui", &us->host, us->file_name, us->line); return NGX_ERROR; } ngx_memzero(&u, sizeof(ngx_url_t)); u.host = us->host; u.port = (in_port_t) (us->port ? us->port : us->default_port); if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) { if (u.err) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "%s in upstream \"%V\" in %s:%ui", u.err, &us->host, us->file_name, us->line); } return NGX_ERROR; } n = u.naddrs; peers = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_rr_peers_t) + sizeof(ngx_http_upstream_rr_peer_t) * (n - 1)); if (peers == NULL) { return NGX_ERROR; } peers->single = (n == 1); peers->number = n; peers->name = &us->host; for (i = 0; i < u.naddrs; i++) { peers->peer[i].sockaddr = u.addrs[i].sockaddr; peers->peer[i].socklen = u.addrs[i].socklen; peers->peer[i].name = u.addrs[i].name; peers->peer[i].weight = 1; peers->peer[i].current_weight = 1; peers->peer[i].max_fails = 1; peers->peer[i].fail_timeout = 10; } us->peer.data = peers; /* implicitly defined upstream has no backup servers */ return NGX_OK; } static ngx_int_t ngx_http_upstream_cmp_servers(const void *one, const void *two) { ngx_http_upstream_rr_peer_t *first, *second; first = (ngx_http_upstream_rr_peer_t *) one; second = (ngx_http_upstream_rr_peer_t *) two; return (first->weight < second->weight); } ngx_int_t ngx_http_upstream_init_round_robin_peer(ngx_http_request_t *r, ngx_http_upstream_srv_conf_t *us) { ngx_uint_t n; ngx_http_upstream_rr_peer_data_t *rrp; rrp = r->upstream->peer.data; if (rrp == NULL) { rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); if (rrp == NULL) { return NGX_ERROR; } r->upstream->peer.data = rrp; } rrp->peers = us->peer.data; rrp->current = 0; if (rrp->peers->number <= 8 * sizeof(uintptr_t)) { rrp->tried = &rrp->data; rrp->data = 0; } else { n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) / (8 * sizeof(uintptr_t)); rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); if (rrp->tried == NULL) { return NGX_ERROR; } } r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; r->upstream->peer.tries = rrp->peers->number; #if (NGX_HTTP_SSL) r->upstream->peer.set_session = ngx_http_upstream_set_round_robin_peer_session; r->upstream->peer.save_session = ngx_http_upstream_save_round_robin_peer_session; #endif return NGX_OK; } ngx_int_t ngx_http_upstream_create_round_robin_peer(ngx_http_request_t *r, ngx_http_upstream_resolved_t *ur) { u_char *p; size_t len; ngx_uint_t i, n; struct sockaddr_in *sin; ngx_http_upstream_rr_peers_t *peers; ngx_http_upstream_rr_peer_data_t *rrp; rrp = r->upstream->peer.data; if (rrp == NULL) { rrp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_rr_peer_data_t)); if (rrp == NULL) { return NGX_ERROR; } r->upstream->peer.data = rrp; } peers = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_rr_peers_t) + sizeof(ngx_http_upstream_rr_peer_t) * (ur->naddrs - 1)); if (peers == NULL) { return NGX_ERROR; } peers->single = (ur->naddrs == 1); peers->number = ur->naddrs; peers->name = &ur->host; for (i = 0; i < ur->naddrs; i++) { len = NGX_INET_ADDRSTRLEN + sizeof(":65536") - 1; p = ngx_pnalloc(r->pool, len); if (p == NULL) { return NGX_ERROR; } len = ngx_inet_ntop(AF_INET, &ur->addrs[i], p, NGX_INET_ADDRSTRLEN); len = ngx_sprintf(&p[len], ":%d", ur->port) - p; sin = ngx_pcalloc(r->pool, sizeof(struct sockaddr_in)); if (sin == NULL) { return NGX_ERROR; } sin->sin_family = AF_INET; sin->sin_port = htons(ur->port); sin->sin_addr.s_addr = ur->addrs[i]; peers->peer[i].sockaddr = (struct sockaddr *) sin; peers->peer[i].socklen = sizeof(struct sockaddr_in); peers->peer[i].name.len = len; peers->peer[i].name.data = p; peers->peer[i].weight = 1; peers->peer[i].current_weight = 1; peers->peer[i].max_fails = 1; peers->peer[i].fail_timeout = 10; } rrp->peers = peers; rrp->current = 0; if (rrp->peers->number <= 8 * sizeof(uintptr_t)) { rrp->tried = &rrp->data; rrp->data = 0; } else { n = (rrp->peers->number + (8 * sizeof(uintptr_t) - 1)) / (8 * sizeof(uintptr_t)); rrp->tried = ngx_pcalloc(r->pool, n * sizeof(uintptr_t)); if (rrp->tried == NULL) { return NGX_ERROR; } } r->upstream->peer.get = ngx_http_upstream_get_round_robin_peer; r->upstream->peer.free = ngx_http_upstream_free_round_robin_peer; r->upstream->peer.tries = rrp->peers->number; #if (NGX_HTTP_SSL) r->upstream->peer.set_session = ngx_http_upstream_set_round_robin_peer_session; r->upstream->peer.save_session = ngx_http_upstream_save_round_robin_peer_session; #endif return NGX_OK; } ngx_int_t ngx_http_upstream_get_round_robin_peer(ngx_peer_connection_t *pc, void *data) { ngx_http_upstream_rr_peer_data_t *rrp = data; time_t now; uintptr_t m; ngx_int_t rc; ngx_uint_t i, n; ngx_connection_t *c; ngx_http_upstream_rr_peer_t *peer; ngx_http_upstream_rr_peers_t *peers; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, "get rr peer, try: %ui", pc->tries); now = ngx_time(); /* ngx_lock_mutex(rrp->peers->mutex); */ if (rrp->peers->last_cached) { /* cached connection */ c = rrp->peers->cached[rrp->peers->last_cached]; rrp->peers->last_cached--; /* ngx_unlock_mutex(ppr->peers->mutex); */ #if (NGX_THREADS) c->read->lock = c->read->own_lock; c->write->lock = c->write->own_lock; #endif pc->connection = c; pc->cached = 1; return NGX_OK; } pc->cached = 0; pc->connection = NULL; if (rrp->peers->single) { peer = &rrp->peers->peer[0]; } else { /* there are several peers */ if (pc->tries == rrp->peers->number) { /* it's a first try - get a current peer */ i = pc->tries; for ( ;; ) { rrp->current = ngx_http_upstream_get_peer(rrp->peers); ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, "get rr peer, current: %ui %i", rrp->current, rrp->peers->peer[rrp->current].current_weight); n = rrp->current / (8 * sizeof(uintptr_t)); m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); if (!(rrp->tried[n] & m)) { peer = &rrp->peers->peer[rrp->current]; if (!peer->down) { if (peer->max_fails == 0 || peer->fails < peer->max_fails) { break; } if (now - peer->accessed > peer->fail_timeout) { peer->fails = 0; break; } peer->current_weight = 0; } else { rrp->tried[n] |= m; } pc->tries--; } if (pc->tries == 0) { goto failed; } if (--i == 0) { ngx_log_error(NGX_LOG_ALERT, pc->log, 0, "round robin upstream stuck on %ui tries", pc->tries); goto failed; } } peer->current_weight--; } else { i = pc->tries; for ( ;; ) { n = rrp->current / (8 * sizeof(uintptr_t)); m = (uintptr_t) 1 << rrp->current % (8 * sizeof(uintptr_t)); if (!(rrp->tried[n] & m)) { peer = &rrp->peers->peer[rrp->current]; if (!peer->down) { if (peer->max_fails == 0 || peer->fails < peer->max_fails) { break; } if (now - peer->accessed > peer->fail_timeout) { peer->fails = 0; break; } peer->current_weight = 0; } else { rrp->tried[n] |= m; } pc->tries--; } rrp->current++; if (rrp->current >= rrp->peers->number) { rrp->current = 0; } if (pc->tries == 0) { goto failed; } if (--i == 0) { ngx_log_error(NGX_LOG_ALERT, pc->log, 0, "round robin upstream stuck on %ui tries", pc->tries); goto failed; } } peer->current_weight--; } rrp->tried[n] |= m; } pc->sockaddr = peer->sockaddr; pc->socklen = peer->socklen; pc->name = &peer->name; /* ngx_unlock_mutex(rrp->peers->mutex); */ if (pc->tries == 1 && rrp->peers->next) { pc->tries += rrp->peers->next->number; n = rrp->peers->next->number / (8 * sizeof(uintptr_t)) + 1; for (i = 0; i < n; i++) { rrp->tried[i] = 0; } } return NGX_OK; failed: peers = rrp->peers; if (peers->next) { /* ngx_unlock_mutex(peers->mutex); */ ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, "backup servers"); rrp->peers = peers->next; pc->tries = rrp->peers->number; n = rrp->peers->number / (8 * sizeof(uintptr_t)) + 1; for (i = 0; i < n; i++) { rrp->tried[i] = 0; } rc = ngx_http_upstream_get_round_robin_peer(pc, rrp); if (rc != NGX_BUSY) { return rc; } /* ngx_lock_mutex(peers->mutex); */ } /* all peers failed, mark them as live for quick recovery */ for (i = 0; i < peers->number; i++) { peers->peer[i].fails = 0; } /* ngx_unlock_mutex(peers->mutex); */ pc->name = peers->name; return NGX_BUSY; } static ngx_uint_t ngx_http_upstream_get_peer(ngx_http_upstream_rr_peers_t *peers) { ngx_uint_t i, n; ngx_http_upstream_rr_peer_t *peer; peer = &peers->peer[0]; for ( ;; ) { for (i = 0; i < peers->number; i++) { if (peer[i].current_weight <= 0) { continue; } n = i; while (i < peers->number - 1) { i++; if (peer[i].current_weight <= 0) { continue; } if (peer[n].current_weight * 1000 / peer[i].current_weight > peer[n].weight * 1000 / peer[i].weight) { return n; } n = i; } if (peer[i].current_weight > 0) { n = i; } return n; } for (i = 0; i < peers->number; i++) { peer[i].current_weight = peer[i].weight; } } } void ngx_http_upstream_free_round_robin_peer(ngx_peer_connection_t *pc, void *data, ngx_uint_t state) { ngx_http_upstream_rr_peer_data_t *rrp = data; time_t now; ngx_http_upstream_rr_peer_t *peer; ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, "free rr peer %ui %ui", pc->tries, state); if (state == 0 && pc->tries == 0) { return; } /* TODO: NGX_PEER_KEEPALIVE */ if (rrp->peers->single) { pc->tries = 0; return; } if (state & NGX_PEER_FAILED) { now = ngx_time(); peer = &rrp->peers->peer[rrp->current]; /* ngx_lock_mutex(rrp->peers->mutex); */ peer->fails++; peer->accessed = now; if (peer->max_fails) { peer->current_weight -= peer->weight / peer->max_fails; } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, "free rr peer failed: %ui %i", rrp->current, peer->current_weight); if (peer->current_weight < 0) { peer->current_weight = 0; } /* ngx_unlock_mutex(rrp->peers->mutex); */ } rrp->current++; if (rrp->current >= rrp->peers->number) { rrp->current = 0; } if (pc->tries) { pc->tries--; } /* ngx_unlock_mutex(rrp->peers->mutex); */ } #if (NGX_HTTP_SSL) ngx_int_t ngx_http_upstream_set_round_robin_peer_session(ngx_peer_connection_t *pc, void *data) { ngx_http_upstream_rr_peer_data_t *rrp = data; ngx_int_t rc; ngx_ssl_session_t *ssl_session; ngx_http_upstream_rr_peer_t *peer; peer = &rrp->peers->peer[rrp->current]; /* TODO: threads only mutex */ /* ngx_lock_mutex(rrp->peers->mutex); */ ssl_session = peer->ssl_session; rc = ngx_ssl_set_session(pc->connection, ssl_session); ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, "set session: %p:%d", ssl_session, ssl_session ? ssl_session->references : 0); /* ngx_unlock_mutex(rrp->peers->mutex); */ return rc; } void ngx_http_upstream_save_round_robin_peer_session(ngx_peer_connection_t *pc, void *data) { ngx_http_upstream_rr_peer_data_t *rrp = data; ngx_ssl_session_t *old_ssl_session, *ssl_session; ngx_http_upstream_rr_peer_t *peer; ssl_session = ngx_ssl_get_session(pc->connection); if (ssl_session == NULL) { return; } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, "save session: %p:%d", ssl_session, ssl_session->references); peer = &rrp->peers->peer[rrp->current]; /* TODO: threads only mutex */ /* ngx_lock_mutex(rrp->peers->mutex); */ old_ssl_session = peer->ssl_session; peer->ssl_session = ssl_session; /* ngx_unlock_mutex(rrp->peers->mutex); */ if (old_ssl_session) { ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, "old session: %p:%d", old_ssl_session, old_ssl_session->references); /* TODO: may block */ ngx_ssl_free_session(old_ssl_session); } } #endif