Mercurial > hg > nginx-quic
view src/http/ngx_http_upstream_round_robin.c @ 4314:4a07bad0e2c5
Allowed add_header for proxied 206 replies.
It was working for nginx's own 206 replies as they are seen as 200 in the
headers filter module (range filter goes later in the headers filter chain),
but not for proxied replies.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Mon, 28 Nov 2011 10:00:47 +0000 |
parents | 4fc91bae6f83 |
children | d620f497c50f |
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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->checked > peer->fail_timeout) { peer->checked = now; 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->checked > peer->fail_timeout) { peer->checked = now; 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; } peer = &rrp->peers->peer[rrp->current]; if (state & NGX_PEER_FAILED) { now = ngx_time(); /* ngx_lock_mutex(rrp->peers->mutex); */ peer->fails++; peer->accessed = now; peer->checked = 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); */ } else { /* mark peer live if check passed */ if (peer->accessed < peer->checked) { peer->fails = 0; } } 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