mirror of
https://github.com/nginx/nginx.git
synced 2024-12-16 14:19:00 +08:00
288 lines
6.7 KiB
C
288 lines
6.7 KiB
C
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#include <ngx_config.h>
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#include <ngx_core.h>
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#include <ngx_event.h>
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#include <ngx_event_connect.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, instance, event;
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time_t now;
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ngx_err_t err;
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ngx_peer_t *peer;
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ngx_socket_t s;
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ngx_event_t *rev, *wev;
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ngx_connection_t *c;
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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); */
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if (pc->peers->last_cached) {
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/* cached connection */
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pc->connection = pc->peers->cached[pc->peers->last_cached];
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pc->peers->last_cached--;
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/* ngx_unlock_mutex(pc->peers->mutex); */
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pc->cached = 1;
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return NGX_OK;
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}
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pc->cached = 0;
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pc->connection = NULL;
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if (pc->peers->number == 1) {
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peer = &pc->peers->peers[0];
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} 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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}
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if (pc->peers->max_fails == 0) {
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peer = &pc->peers->peers[pc->cur_peer];
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} 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
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|| (now - peer->accessed > pc->peers->fail_timeout))
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{
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break;
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}
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pc->cur_peer++;
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if (pc->cur_peer >= pc->peers->number) {
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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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}
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}
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}
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}
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/* ngx_unlock_mutex(pc->peers->mutex); */
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s = ngx_socket(AF_INET, SOCK_STREAM, IPPROTO_IP, 0);
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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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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) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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"setsockopt(SO_RCVBUF) failed");
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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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}
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return NGX_ERROR;
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}
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}
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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");
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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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}
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return NGX_ERROR;
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}
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#if (WIN32)
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/*
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* Winsock assignes a socket number divisible by 4
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* so to find a connection we divide a socket number by 4.
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*/
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if (s % 4) {
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ngx_log_error(NGX_LOG_EMERG, pc->log, 0,
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ngx_socket_n
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" created socket %d, not divisible by 4", s);
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exit(1);
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}
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c = &ngx_cycle->connections[s / 4];
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rev = &ngx_cycle->read_events[s / 4];
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wev = &ngx_cycle->write_events[s / 4];
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#else
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c = &ngx_cycle->connections[s];
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rev = &ngx_cycle->read_events[s];
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wev = &ngx_cycle->write_events[s];
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#endif
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instance = rev->instance;
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ngx_memzero(c, sizeof(ngx_connection_t));
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ngx_memzero(rev, sizeof(ngx_event_t));
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ngx_memzero(wev, sizeof(ngx_event_t));
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rev->index = wev->index = NGX_INVALID_INDEX;
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rev->data = wev->data = c;
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c->read = rev;
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c->write = wev;
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wev->write = 1;
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rev->instance = wev->instance = !instance;
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rev->log = wev->log = c->log = pc->log;
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c->fd = s;
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pc->connection = c;
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if (ngx_add_conn) {
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if (ngx_add_conn(c) == NGX_ERROR) {
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return NGX_ERROR;
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}
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}
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ngx_memzero(&addr, sizeof(struct sockaddr_in));
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = peer->addr;
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addr.sin_port = peer->port;
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ngx_log_debug(pc->log, "CONNECT: %s" _ peer->addr_port_text.data);
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rc = connect(s, (struct sockaddr *) &addr, sizeof(struct sockaddr_in));
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if (rc == -1) {
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err = ngx_socket_errno;
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if (err != NGX_EINPROGRESS) {
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ngx_log_error(NGX_LOG_ERR, pc->log, err, "connect() failed");
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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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}
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c->fd = -1;
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return NGX_CONNECT_ERROR;
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}
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}
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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) {
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ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno,
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ngx_blocking_n " failed");
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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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}
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return NGX_ERROR;
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}
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/*
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* aio allows to post operation on non-connected socket
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* at least in FreeBSD
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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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}
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/* TODO: epoll */
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if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { /* kqueue */
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event = NGX_CLEAR_EVENT;
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} else { /* select, poll, /dev/poll */
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event = NGX_LEVEL_EVENT;
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}
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if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) {
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return NGX_ERROR;
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}
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if (rc == -1) {
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/* NGX_EINPROGRESS */
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if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) {
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return NGX_ERROR;
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}
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return NGX_AGAIN;
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}
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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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{
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time_t now;
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now = ngx_time();
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/* ngx_lock_mutex(pc->peers->mutex); */
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pc->peers->peers[pc->cur_peer].fails++;
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pc->peers->peers[pc->cur_peer].accessed = now;
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/* ngx_unlock_mutex(pc->peers->mutex); */
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pc->cur_peer++;
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if (pc->cur_peer >= pc->peers->number) {
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pc->cur_peer = 0;
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}
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pc->tries--;
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return;
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}
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