Mercurial > hg > nginx-quic
view src/event/ngx_event_connect.c @ 283:8f65fee68270
nginx-0.0.2-2004-03-10-20:55:19 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Wed, 10 Mar 2004 17:55:19 +0000 |
parents | 70e1c7d2b83d |
children | f81d075ad172 |
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#include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_event_connect.h> #include <nginx.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; /* * 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_connection_counter++; 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_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0, "connect to %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_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) { 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; }