| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| #include <ngx_event.h> |
| #include <ngx_event_connect.h> |
| |
| |
| /* AF_INET only */ |
| |
| int ngx_event_connect_peer(ngx_peer_connection_t *pc) |
| { |
| int rc, instance; |
| 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; |
| struct sockaddr_in addr; |
| |
| now = ngx_time(); |
| |
| /* ngx_lock_mutex(pc->peers->mutex); */ |
| |
| if (pc->peers->last_cached) { |
| |
| /* cached connection */ |
| |
| pc->connection = pc->peers->cached[pc->peers->last_cached]; |
| pc->peers->last_cached--; |
| |
| /* ngx_unlock_mutex(pc->peers->mutex); */ |
| |
| pc->cached = 1; |
| return NGX_OK; |
| } |
| |
| pc->cached = 0; |
| pc->connection = NULL; |
| |
| if (pc->peers->number == 1) { |
| peer = &pc->peers->peers[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++; |
| |
| if (pc->peers->current >= pc->peers->number) { |
| pc->peers->current = 0; |
| } |
| } |
| |
| if (pc->peers->max_fails == 0) { |
| peer = &pc->peers->peers[pc->cur_peer]; |
| |
| } else { |
| |
| /* the peers support a fault tolerance */ |
| |
| for ( ;; ) { |
| peer = &pc->peers->peers[pc->cur_peer]; |
| |
| if (peer->fails <= pc->peers->max_fails |
| || (now - peer->accessed > pc->peers->fail_timeout)) |
| { |
| break; |
| } |
| |
| pc->cur_peer++; |
| |
| if (pc->cur_peer >= pc->peers->number) { |
| pc->cur_peer = 0; |
| } |
| |
| pc->tries--; |
| |
| if (pc->tries == 0) { |
| /* ngx_unlock_mutex(pc->peers->mutex); */ |
| |
| return NGX_ERROR; |
| } |
| } |
| } |
| } |
| |
| /* ngx_unlock_mutex(pc->peers->mutex); */ |
| |
| |
| s = ngx_socket(AF_INET, SOCK_STREAM, IPPROTO_IP, 0); |
| |
| if (s == -1) { |
| ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, |
| ngx_socket_n " failed"); |
| return NGX_ERROR; |
| } |
| |
| 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"); |
| |
| 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"); |
| |
| 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 (WIN32) |
| /* |
| * 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); |
| } |
| |
| 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 |
| |
| instance = rev->instance; |
| |
| ngx_memzero(c, sizeof(ngx_connection_t)); |
| ngx_memzero(rev, sizeof(ngx_event_t)); |
| ngx_memzero(wev, sizeof(ngx_event_t)); |
| |
| rev->index = NGX_INVALID_INDEX; |
| wev->index = NGX_INVALID_INDEX; |
| |
| rev->data = c; |
| wev->data = c; |
| |
| c->read = rev; |
| c->write = wev; |
| wev->write = 1; |
| |
| rev->instance = !instance; |
| wev->instance = !instance; |
| |
| c->log = pc->log; |
| rev->log = pc->log; |
| wev->log = pc->log; |
| |
| c->fd = s; |
| |
| pc->connection = c; |
| |
| if (ngx_add_conn) { |
| if (ngx_add_conn(c) == NGX_ERROR) { |
| return NGX_ERROR; |
| } |
| } |
| |
| ngx_memzero(&addr, sizeof(struct sockaddr_in)); |
| |
| addr.sin_family = AF_INET; |
| addr.sin_port = peer->port; |
| addr.sin_addr.s_addr = peer->addr; |
| |
| ngx_log_debug(pc->log, "CONNECT: %s" _ peer->addr_port_text.data); |
| |
| rc = connect(s, (struct sockaddr *) &addr, sizeof(struct sockaddr_in)); |
| |
| if (rc == -1) { |
| err = ngx_socket_errno; |
| |
| /* Winsock returns WSAEWOULDBLOCK */ |
| |
| if (err != NGX_EINPROGRESS && err != NGX_EAGAIN) { |
| ngx_log_error(NGX_LOG_ERR, pc->log, err, "connect() failed"); |
| |
| if (ngx_close_socket(s) == -1) { |
| ngx_log_error(NGX_LOG_ALERT, pc->log, ngx_socket_errno, |
| ngx_close_socket_n " failed"); |
| } |
| |
| c->fd = -1; |
| |
| return NGX_CONNECT_ERROR; |
| } |
| } |
| |
| if (ngx_event_flags & NGX_USE_AIO_EVENT) { |
| |
| /* aio, iocp */ |
| |
| 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 |
| * at least in FreeBSD. |
| * 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; |
| } |
| |
| /* TODO: epoll */ |
| |
| 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_debug(pc->log, "CONNECTED"); |
| |
| wev->ready = 1; |
| |
| return NGX_OK; |
| } |
| |
| |
| void ngx_event_connect_peer_failed(ngx_peer_connection_t *pc) |
| { |
| 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); */ |
| |
| pc->cur_peer++; |
| |
| if (pc->cur_peer >= pc->peers->number) { |
| pc->cur_peer = 0; |
| } |
| |
| pc->tries--; |
| |
| return; |
| } |
