#include #include #include #include /* AF_INET only */ int ngx_event_connect_peer(ngx_peer_connection_t *pc) { int rc, instance, 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; peer = &pc->peers->peers[0]; if (pc->peers->number > 1) { /* 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) { /* 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); */ #if 0 pc->addr_port_text = peer->addr_port_text; #endif 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 = wev->index = NGX_INVALID_INDEX; rev->data = wev->data = c; c->read = rev; c->write = wev; wev->write = 1; rev->instance = wev->instance = !instance; rev->log = wev->log = c->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_addr.s_addr = peer->addr; addr.sin_port = peer->port; rc = connect(s, (struct sockaddr *) &addr, sizeof(struct sockaddr_in)); if (rc == -1) { err = ngx_socket_errno; if (err != NGX_EINPROGRESS) { ngx_log_error(NGX_LOG_CRIT, 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; } } /* TODO: epoll, aio, iocp */ if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { /* kqueue */ event = NGX_CLEAR_EVENT; } else { /* select, poll, /dev/poll */ event = NGX_LEVEL_EVENT; } if (rc == -1) { /* NGX_EINPROGRESS */ if (ngx_add_event(wev, NGX_WRITE_EVENT, event) != NGX_OK) { return NGX_ERROR; } return NGX_AGAIN; } wev->ready = 1; if (ngx_add_event(rev, NGX_READ_EVENT, event) != NGX_OK) { return NGX_ERROR; } return NGX_OK; } void ngx_event_connect_peer_failed(ngx_peer_connection_t *pc) { pc->tries--; return; }