nginx/src/event/ngx_event_connect.c

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/*
* Copyright (C) 2002-2004 Igor Sysoev
*/
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#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
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#include <ngx_event_connect.h>
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#include <nginx.h>
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/* AF_INET only */
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int ngx_event_connect_peer(ngx_peer_connection_t *pc)
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{
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int rc;
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ngx_uint_t instance;
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u_int event;
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time_t now;
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ngx_err_t err;
ngx_peer_t *peer;
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ngx_socket_t s;
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ngx_event_t *rev, *wev;
ngx_connection_t *c;
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ngx_event_conf_t *ecf;
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struct sockaddr_in addr;
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now = ngx_time();
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/* ngx_lock_mutex(pc->peers->mutex); */
if (pc->peers->last_cached) {
/* cached connection */
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c = pc->peers->cached[pc->peers->last_cached];
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pc->peers->last_cached--;
/* ngx_unlock_mutex(pc->peers->mutex); */
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#if (NGX_THREADS)
c->read->lock = c->read->own_lock;
c->write->lock = c->write->own_lock;
#endif
pc->connection = c;
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pc->cached = 1;
return NGX_OK;
}
pc->cached = 0;
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pc->connection = NULL;
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if (pc->peers->number == 1) {
peer = &pc->peers->peers[0];
} else {
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/* there are several peers */
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if (pc->tries == pc->peers->number) {
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/* it's a first try - get a current peer */
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pc->cur_peer = pc->peers->current++;
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if (pc->peers->current >= pc->peers->number) {
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pc->peers->current = 0;
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}
}
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if (pc->peers->max_fails == 0) {
peer = &pc->peers->peers[pc->cur_peer];
} else {
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/* the peers support a fault tolerance */
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for ( ;; ) {
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peer = &pc->peers->peers[pc->cur_peer];
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if (peer->fails <= pc->peers->max_fails
|| (now - peer->accessed > pc->peers->fail_timeout))
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{
break;
}
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pc->cur_peer++;
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if (pc->cur_peer >= pc->peers->number) {
pc->cur_peer = 0;
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}
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pc->tries--;
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if (pc->tries == 0) {
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/* ngx_unlock_mutex(pc->peers->mutex); */
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return NGX_ERROR;
}
}
}
}
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/* ngx_unlock_mutex(pc->peers->mutex); */
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s = ngx_socket(AF_INET, SOCK_STREAM, IPPROTO_IP, 0);
if (s == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_socket_n " failed");
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return NGX_ERROR;
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}
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ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
/* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
if ((ngx_uint_t) s >= ecf->connections) {
ngx_log_error(NGX_LOG_ALERT, pc->log, 0,
"socket() returned socket #%d while only %d "
"connections was configured, closing the socket",
s, ecf->connections);
if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_close_socket_n "failed");
}
/* TODO: sleep for some time */
return NGX_ERROR;
}
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if (pc->rcvbuf) {
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if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
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(const void *) &pc->rcvbuf, sizeof(int)) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(SO_RCVBUF) failed");
if (ngx_close_socket(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_close_socket_n " failed");
}
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return NGX_ERROR;
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}
}
if (ngx_nonblocking(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_nonblocking_n " failed");
if (ngx_close_socket(s) == -1) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_close_socket_n " failed");
}
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return NGX_ERROR;
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}
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#if (WIN32)
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/*
* Winsock assignes a socket number divisible by 4
* so to find a connection we divide a socket number by 4.
*/
if (s % 4) {
ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
ngx_socket_n
" created socket %d, not divisible by 4", s);
exit(1);
}
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c = &ngx_cycle->connections[s / 4];
rev = &ngx_cycle->read_events[s / 4];
wev = &ngx_cycle->write_events[s / 4];
#else
c = &ngx_cycle->connections[s];
rev = &ngx_cycle->read_events[s];
wev = &ngx_cycle->write_events[s];
#endif
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instance = rev->instance;
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#if (NGX_THREADS)
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if (*(&c->lock)) {
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ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
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"spinlock in connect, fd:%d", s);
ngx_spinlock(&c->lock, 1000);
ngx_unlock(&c->lock);
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}
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#endif
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ngx_memzero(c, sizeof(ngx_connection_t));
ngx_memzero(rev, sizeof(ngx_event_t));
ngx_memzero(wev, sizeof(ngx_event_t));
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rev->instance = !instance;
wev->instance = !instance;
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rev->index = NGX_INVALID_INDEX;
wev->index = NGX_INVALID_INDEX;
rev->data = c;
wev->data = c;
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c->read = rev;
c->write = wev;
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wev->write = 1;
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c->log = pc->log;
rev->log = pc->log;
wev->log = pc->log;
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c->fd = s;
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c->log_error = pc->log_error;
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pc->connection = c;
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/*
* 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
*/
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c->number = ngx_atomic_inc(ngx_connection_counter);
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#if (NGX_THREADS)
rev->lock = pc->lock;
wev->lock = pc->lock;
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rev->own_lock = &c->lock;
wev->own_lock = &c->lock;
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#endif
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if (ngx_add_conn) {
if (ngx_add_conn(c) == NGX_ERROR) {
return NGX_ERROR;
}
}
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ngx_memzero(&addr, sizeof(struct sockaddr_in));
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addr.sin_family = AF_INET;
addr.sin_port = peer->port;
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addr.sin_addr.s_addr = peer->addr;
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ngx_log_debug2(NGX_LOG_DEBUG_EVENT, pc->log, 0,
"connect to %s, #%d", peer->addr_port_text.data, c->number);
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rc = connect(s, (struct sockaddr *) &addr, sizeof(struct sockaddr_in));
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if (rc == -1) {
err = ngx_socket_errno;
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/* Winsock returns WSAEWOULDBLOCK (NGX_EAGAIN) */
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if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) {
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ngx_connection_error(c, err, "connect() failed");
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if (ngx_close_socket(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_close_socket_n " failed");
}
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c->fd = (ngx_socket_t) -1;
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return NGX_CONNECT_ERROR;
}
}
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if (ngx_add_conn) {
if (rc == -1) {
/* NGX_EINPROGRESS */
return NGX_AGAIN;
}
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
return NGX_OK;
}
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if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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/* aio, iocp */
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if (ngx_blocking(s) == -1) {
ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
ngx_blocking_n " failed");
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;
}
/*
* aio allows to post operation on non-connected socket
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* at least in FreeBSD.
* NT does not support it.
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*
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* TODO: check in Win32, etc. As workaround we can use NGX_ONESHOT_EVENT
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*/
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rev->ready = 1;
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wev->ready = 1;
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return NGX_OK;
}
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if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { /* kqueue */
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event = NGX_CLEAR_EVENT;
} else { /* select, poll, /dev/poll */
event = NGX_LEVEL_EVENT;
}
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if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
return NGX_ERROR;
}
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if (rc == -1) {
/* NGX_EINPROGRESS */
if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
return NGX_ERROR;
}
return NGX_AGAIN;
}
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ngx_log_debug0(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connected");
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wev->ready = 1;
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return NGX_OK;
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}
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void ngx_event_connect_peer_failed(ngx_peer_connection_t *pc)
{
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time_t now;
now = ngx_time();
/* ngx_lock_mutex(pc->peers->mutex); */
pc->peers->peers[pc->cur_peer].fails++;
pc->peers->peers[pc->cur_peer].accessed = now;
/* ngx_unlock_mutex(pc->peers->mutex); */
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pc->cur_peer++;
if (pc->cur_peer >= pc->peers->number) {
pc->cur_peer = 0;
}
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pc->tries--;
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return;
}