| |
| /* |
| * 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--; |
| } |
| } |
