/// <summary>
/// The routine that is executed by the listening thread.
/// </summary>
private void ReceiveMsg()
{
try
{
// Buffer messages
byte[] data = new byte[1024];
MessageBuffer buffer = new MessageBuffer((string message) =>
{
if (message.Equals(CommunicationConstants.COMM_DISCONNECT_MSG))
{
IsConnected = false;
}
else
{
_receiveMessageCallback(message);
}
});
// Keep listening for messages
while (IsConnected)
{
// Receive message
int recv = _socket.Receive(data);
string stringdata = Encoding.UTF8.GetString(data, 0, recv);
// Pass message to buffer
buffer.SubmitFragment(stringdata);
// counts empty StringData to avoid deadlock
if (stringdata.Equals(""))
{
_nullMessageCounter++;
}
else
{
_nullMessageCounter = 0;
// Log message
_logger("<<<<::" + stringdata);
}
if (_nullMessageCounter > 10)
{
Disconnect();
}
}
}
catch (Exception ex)
{
// Disconnect when running into problems
_logger("Terminating connection due to an error:" + Environment.NewLine + ex.Message);
Disconnect();
}
}
/// <summary>
/// Called for every new connection request.
/// </summary>
/// <param name="ar">The async result containing the server socket</param>
public void OnConnectRequest(IAsyncResult ar)
{
//Init SOCKET
Socket serverSocket = (Socket)ar.AsyncState;
Socket newClientSocket = serverSocket.EndAccept(ar);
string welcomeMessage = "Welcome! The Server is Connected!";
byte[] byteDateLine = System.Text.Encoding.UTF8.GetBytes(welcomeMessage);
//show message to client and show the connection infos
string ip = newClientSocket.RemoteEndPoint.ToString();
_logger(ip + "::connection established:" + DateTime.Now.ToString("G"));
newClientSocket.Send(byteDateLine, byteDateLine.Length, 0);
// Buffer messages from the client
bool terminated = false;
MessageBuffer buffer = new MessageBuffer((string message) => { HandleMetaMessage(newClientSocket, message, out terminated); });
// Wait for another new client connection
serverSocket.BeginAccept(new AsyncCallback(OnConnectRequest), serverSocket);
// Start receiving messages until communication termination
try
{
while (!terminated)
{
// Read the message
int recv = newClientSocket.Receive(byteDateLine);
string stringdata = Encoding.UTF8.GetString(byteDateLine, 0, recv);
// Pass message to buffer
buffer.SubmitFragment(stringdata);
}
}
catch (SocketException ex)
{
try
{
// Log exception
_logger(newClientSocket.RemoteEndPoint.ToString() + "::exception:" + ex.Message + ":" + DateTime.Now.ToString("G"));
// Try to remove the client
bool foundClient = false; ClientType clientType = ClientType.R; int clientID = 0;
if (_botClients.Values.Contains(newClientSocket))
{
foundClient = true; clientType = ClientType.R; clientID = _botClients.First(kvp => kvp.Value == newClientSocket).Key;
}
if (_controlClients.Values.Contains(newClientSocket))
{
foundClient = true; clientType = ClientType.C; clientID = _controlClients.First(kvp => kvp.Value == newClientSocket).Key;
}
if (_iStationClients.Values.Contains(newClientSocket))
{
foundClient = true; clientType = ClientType.I; clientID = _iStationClients.First(kvp => kvp.Value == newClientSocket).Key;
}
if (_oStationClients.Values.Contains(newClientSocket))
{
foundClient = true; clientType = ClientType.O; clientID = _oStationClients.First(kvp => kvp.Value == newClientSocket).Key;
}
if (foundClient)
{
RemoveDeadClient(clientType, clientID, newClientSocket);
}
}
catch (ObjectDisposedException) { _logger(ip + "::exception:" + ex.Message + ":" + DateTime.Now.ToString("G")); }
}
}
