private void _connect(Dictionary <string, string> data = null)
{
for (int i = 0; i < _ipAddresses.Count; i++)
{
try
{
// if the IP address is not supported then skip, e.g. IPv6 address but not supported by network card
if (_ipAddresses[i] == null ||
(_ipAddresses[i].AddressFamily == AddressFamily.InterNetwork && !Socket.OSSupportsIPv4) ||
(_ipAddresses[i].AddressFamily == AddressFamily.InterNetworkV6 && !Socket.OSSupportsIPv6))
{
continue;
}
// attempt to connect to remote endpoint (will throw if not available)
_tcpClient = ComponentFactory.BuildTcpClient(_ipAddresses[i].ToString(), _port, _sslSettings);
_networkStream = _tcpClient.GetStream();
_networkStream.AuthenticateAsClient();
Log.InfoFormat("[{0}] Connected to {1}:{2}", ID, _ipAddresses[i], _port);
break;
}
catch (Exception e)
{
Log.ErrorFormat($"Unable to connect to remote endpoint: {e.Message}");
_tcpClient = null;
_networkStream = null;
}
}
// did one of the addresses make a connection
if (_tcpClient != null && _networkStream != null)
{
// create and start the frame decoder
_streamDecoderTask = _decodeStreamAsync(_networkStream, _cts.Token);
// update state and send start frame
State = ConnectionState.ConnectionStartSent;
_sendFrame(FrameType.ConnectionStart, Frame.CreateConnectionStartFrame(data));
// block until the connection is established, errors, or times out
var index = WaitHandle.WaitAny(new[] { _connectionOpen, _connectionError }, 2000);
// what was the result?
switch (index)
{
// success - return the established connection
case 0: return;
// the connection failed
case 1: throw new ConnectionException("Unable to establish connection");
// establishing the connection timed out
case WaitHandle.WaitTimeout: throw new ConnectionTimeoutException("Establishing a conneciton the remote endpoint timed out");
// should never each this point
default: throw new Exception();
}
}
else
{
// failed to connect to the remote endpoint
throw new ConnectionException("Unable to establish connection");
}
}