portforward.py 文件源码

def _connect(self):
        """Connect to a local server, return True on success."""
        _socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        # No Nagle since we are going for as close to realtime as possible
        _socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
        # Set the timeout for initial connect, as default is too high
        _socket.settimeout(5.0)

        log.debug('connecting to %s:%d', *self.host_port)
        try:
            _socket.connect(self.host_port)
        except socket.timeout:
            log.error('timed out connecting to server')
            return False
        except IOError as e:
            log.error('IO Error when connecting, %s', e)
            return False
        except:
            log.exception('error connecting')
            return False
        else:
            log.debug("connected to %s:%d", *self.host_port)
            self.socket = _socket
            self._flush_buffer()
            return True