private static void TryAcceptConnection <T>(IAsyncResult AR) where T : IClientConnectable
{
if (listenerClosed)
{
return;
}
try
{
Socket newSocket = listenerSocket.EndAccept(AR);
IClientConnectable newClient = (T)Activator.CreateInstance(typeof(T), new object[] { newSocket, ++ClientCounter });
AddClient(newClient);
newClient.Socket.BeginReceive(newClient.Buffer, 0, BufferSize, SocketFlags.None, new AsyncCallback(OnReceiveData), newClient);
listenerSocket.BeginAccept(new AsyncCallback(TryAcceptConnection <T>), null);
if (TryTransmitToClient(newClient, "\nYou are now connected to the network server. For connection-related support, type '/help'.\n\n"))
{
TryTransmitToClient(newClient, newClient.GetImmediateReplyForClient());
}
}
catch (Exception ex)
{
ErrorMessage(ex);
}
}
// =======================================================================================
// ASYNC RECEIVER
// =======================================================================================
private static void OnReceiveData(IAsyncResult ar)
{
IClientConnectable thisClient = (IClientConnectable)ar.AsyncState;
if (thisClient == null)
{
return;
}
if (!Clients.Contains(thisClient))
{
Log($"Discarding listener for {thisClient}.\n");
return;
}
int bytesReceived = 0;
if (thisClient.Socket.Connected)
{
try
{
bytesReceived = thisClient.Socket.EndReceive(ar);
if (bytesReceived > 0)
{
string incomingData = Encoding.ASCII.GetString(thisClient.Buffer, 0, bytesReceived).Trim();
if (incomingData.Length > 0 && incomingData.Substring(0, 1) == "/")
{
string feedback = HandleConsoleCommands(thisClient, incomingData);
if (TryTransmitToClient(thisClient, $"{feedback}\n"))
{
thisClient.Socket.BeginReceive(thisClient.Buffer, 0, BufferSize, 0, new AsyncCallback(OnReceiveData), thisClient);
}
}
else
{
Log($"{thisClient.Nickname}: [{incomingData}]\n");
thisClient.HandleInputFromClientToServer(incomingData);
if (TryTransmitToClient(thisClient, thisClient.GetImmediateReplyForClient()))
{
thisClient.Socket.BeginReceive(thisClient.Buffer, 0, BufferSize, 0, new AsyncCallback(OnReceiveData), thisClient);
}
}
}
}
catch (SocketException ex)
{
switch (ex.ErrorCode)
{
case 10054:
Log($"Error ({ex.ErrorCode}): {thisClient.Nickname} dropped!\n");
RemoveClient(thisClient, false);
break;
default:
ErrorMessage($"SocketException ({ex.ErrorCode}): {ex.Message}!", ex);
break;
}
if (thisClient.Socket.Connected)
{
thisClient.Socket.Close();
}
}
catch (Exception ex)
{
ErrorMessage(ex);
}
}
}