Mercurial > hg > nginx-quic
view src/http/ngx_http_upstream_round_robin.c @ 4448:539355d9e675 stable-1.0
Merge of r4404:
Fixed sched_setaffinity(2) to correctly pass size.
Second argument (cpusetsize) is size in bytes, not in bits. Previously
used constant 32 resulted in reading of uninitialized memory and caused
EINVAL to be returned on some Linux kernels.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Sun, 05 Feb 2012 19:25:24 +0000 |
parents | e917fc5eceb7 |
children | 4919fb357a5d |
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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); #if (NGX_HTTP_SSL) static ngx_int_t ngx_http_upstream_empty_set_session(ngx_peer_connection_t *pc, void *data); static void ngx_http_upstream_empty_save_session(ngx_peer_connection_t *pc, void *data); #endif 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; n = rrp->peers->number; if (rrp->peers->next && rrp->peers->next->number > n) { n = rrp->peers->next->number; } if (n <= 8 * sizeof(uintptr_t)) { rrp->tried = &rrp->data; rrp->data = 0; } else { n = (n + (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; if (ur->sockaddr) { peers->peer[0].sockaddr = ur->sockaddr; peers->peer[0].socklen = ur->socklen; peers->peer[0].name = ur->host; peers->peer[0].weight = 1; peers->peer[0].current_weight = 1; peers->peer[0].max_fails = 1; peers->peer[0].fail_timeout = 10; } else { 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_empty_set_session; r->upstream->peer.save_session = ngx_http_upstream_empty_save_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, reset = 0; 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; } if (reset++) { return 0; } 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); } } static ngx_int_t ngx_http_upstream_empty_set_session(ngx_peer_connection_t *pc, void *data) { return NGX_OK; } static void ngx_http_upstream_empty_save_session(ngx_peer_connection_t *pc, void *data) { return; } #endif