blob: 804226f78ecea8161a121af356b3e7a48ddafa20 [file] [log] [blame]
/*
* 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--;
}
}