Mercurial > hg > nginx-vendor-0-7
view src/event/ngx_event_connect.c @ 105:531d62c2a28d
Added tag NGINX_0_2_6 for changeset 146eff53ab60
author | Igor Sysoev <http://sysoev.ru> |
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date | Wed, 05 Oct 2005 00:00:00 +0400 |
parents | c96cb248dc4b |
children | dad2fe8ecf08 |
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/* * Copyright (C) Igor Sysoev */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_event_connect.h> ngx_int_t ngx_event_connect_peer(ngx_peer_connection_t *pc) { int rc; ngx_uint_t instance, level, i; u_int event; time_t now; ngx_err_t err; ngx_peer_t *peer; ngx_socket_t s; ngx_event_t *rev, *wev; ngx_connection_t *c; now = ngx_time(); /* ngx_lock_mutex(pc->peers->mutex); */ if (pc->peers->last_cached) { /* cached connection */ c = pc->peers->cached[pc->peers->last_cached]; pc->peers->last_cached--; /* ngx_unlock_mutex(pc->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 (pc->peers->number == 1) { peer = &pc->peers->peer[0]; } else { /* there are several peers */ if (pc->tries == pc->peers->number) { /* it's a first try - get a current peer */ pc->cur_peer = pc->peers->current; pc->peers->weight--; if (pc->peers->weight == 0) { pc->peers->current++; } if (pc->peers->current >= pc->peers->number) { pc->peers->current = 0; } if (pc->peers->weight == 0) { pc->peers->weight = pc->peers->peer[pc->peers->current].weight; } } for ( ;; ) { peer = &pc->peers->peer[pc->cur_peer]; if (peer->fails <= peer->max_fails) { break; } if (now - peer->accessed > peer->fail_timeout) { peer->fails = 0; break; } pc->cur_peer++; if (pc->cur_peer >= pc->peers->number) { pc->cur_peer = 0; } pc->tries--; if (pc->tries == 0) { /* all peers failed, mark them as live for quick recovery */ for (i = 0; i < pc->peers->number; i++) { pc->peers->peer[i].fails = 0; } /* ngx_unlock_mutex(pc->peers->mutex); */ return NGX_BUSY; } } } /* ngx_unlock_mutex(pc->peers->mutex); */ s = ngx_socket(peer->sockaddr->sa_family, SOCK_STREAM, 0); ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0, "socket %d", s); if (s == -1) { ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, ngx_socket_n " failed"); return NGX_ERROR; } c = ngx_get_connection(s, pc->log); if (c == NULL) { if (ngx_close_socket(s) == -1) { ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, ngx_close_socket_n "failed"); } return NGX_ERROR; } rev = c->read; wev = c->write; ngx_memzero(c, sizeof(ngx_connection_t)); c->read = rev; c->write = wev; c->fd = s; c->log = pc->log; if (pc->rcvbuf) { if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, (const void *) &pc->rcvbuf, sizeof(int)) == -1) { ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, "setsockopt(SO_RCVBUF) failed"); ngx_free_connection(c); if (ngx_close_socket(s) == -1) { ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, ngx_close_socket_n " failed"); } return NGX_ERROR; } } if (ngx_nonblocking(s) == -1) { ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, ngx_nonblocking_n " failed"); ngx_free_connection(c); if (ngx_close_socket(s) == -1) { ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, ngx_close_socket_n " failed"); } return NGX_ERROR; } c->recv = ngx_recv; c->send = ngx_send; c->send_chain = ngx_send_chain; c->log_error = pc->log_error; if (peer->sockaddr->sa_family != AF_INET) { c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED; c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED; } instance = rev->instance; ngx_memzero(rev, sizeof(ngx_event_t)); ngx_memzero(wev, sizeof(ngx_event_t)); rev->instance = !instance; wev->instance = !instance; rev->index = NGX_INVALID_INDEX; wev->index = NGX_INVALID_INDEX; rev->data = c; wev->data = c; wev->write = 1; rev->log = pc->log; wev->log = pc->log; pc->connection = c; /* * TODO: MT: - atomic increment (x86: lock xadd) * or protection by critical section or mutex * * TODO: MP: - allocated in a shared memory * - atomic increment (x86: lock xadd) * or protection by critical section or mutex */ c->number = ngx_atomic_inc(ngx_connection_counter); #if (NGX_THREADS) rev->lock = pc->lock; wev->lock = pc->lock; rev->own_lock = &c->lock; wev->own_lock = &c->lock; #endif if (ngx_add_conn) { if (ngx_add_conn(c) == NGX_ERROR) { return NGX_ERROR; } } ngx_log_debug3(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connect to %V, fd:%d #%d", &peer->name, s, c->number); rc = connect(s, peer->sockaddr, peer->socklen); if (rc == -1) { err = ngx_socket_errno; /* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */ if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) { if (err == NGX_ECONNREFUSED || err == NGX_EHOSTUNREACH) { level = NGX_LOG_ERR; } else { level = NGX_LOG_CRIT; } ngx_log_error(level, c->log, err, "connect() to %V failed", &peer->name); return NGX_DECLINED; } } if (ngx_add_conn) { if (rc == -1) { /* NGX_EINPROGRESS */ return NGX_AGAIN; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected"); wev->ready = 1; return NGX_OK; } if (ngx_event_flags & NGX_USE_AIO_EVENT) { ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, ngx_socket_errno, "connect(): %d", rc); /* aio, iocp */ if (ngx_blocking(s) == -1) { ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, ngx_blocking_n " failed"); return NGX_ERROR; } /* * FreeBSD's aio allows to post an operation on non-connected socket. * NT does not support it. * * TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT */ rev->ready = 1; wev->ready = 1; return NGX_OK; } if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { /* kqueue */ event = NGX_CLEAR_EVENT; } else { /* select, poll, /dev/poll */ event = NGX_LEVEL_EVENT; } if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { return NGX_ERROR; } if (rc == -1) { /* NGX_EINPROGRESS */ if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) { return NGX_ERROR; } return NGX_AGAIN; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected"); wev->ready = 1; return NGX_OK; } void ngx_event_connect_peer_failed(ngx_peer_connection_t *pc, ngx_uint_t down) { time_t now; if (down) { now = ngx_time(); /* ngx_lock_mutex(pc->peers->mutex); */ pc->peers->peer[pc->cur_peer].fails++; pc->peers->peer[pc->cur_peer].accessed = now; /* ngx_unlock_mutex(pc->peers->mutex); */ } pc->cur_peer++; if (pc->cur_peer >= pc->peers->number) { pc->cur_peer = 0; } if (pc->tries) { pc->tries--; } }