void ReceiveCallback(IAsyncResult ar)
{
PacketState state = null;
try
{
int bytesreceived = rconSocket.EndReceive(ar);
state = (PacketState)ar.AsyncState;
state.BytesSoFar += bytesreceived;
#if DEBUG
Console.WriteLine("Receive Callback. Packet: {0} First packet: {1}, Bytes so far: {2}",
state.PacketCount, state.IsPacketLength, state.BytesSoFar);
#endif
// Spin the processing of this data off into another thread.
ThreadPool.QueueUserWorkItem((object pool_state) =>
{
ProcessIncomingData(state);
});
}
catch (SocketException se)
{
OnError(MessageCode.ConnectionClosed, se.Message);
Disconnect();
}
catch (ObjectDisposedException ode)
{
OnError(MessageCode.AlreadyDisposed, ode.Message);
}
}
void GetNewPacketFromServer()
{
// Prepare the state information for a new packet.
PacketState state = new PacketState();
state.IsPacketLength = true;
state.Data = new byte[4];
state.PacketCount = PacketCount;
PacketCount++;
// If we're debugging, log the packetstate.
// Can use this to trace the packets later.
#if DEBUG
TempPackets.Add(state);
#endif
try
{
rconSocket.BeginReceive(state.Data, 0, 4, SocketFlags.None, new AsyncCallback(ReceiveCallback), state);
}
catch (SocketException se)
{
OnError(MessageCode.ConnectionFailed, se.Message);
Disconnect();
}
}
void StartToReceive(PacketState state)
{
try
{
rconSocket.BeginReceive(state.Data, state.BytesSoFar, state.PacketLength - state.BytesSoFar, SocketFlags.None, new AsyncCallback(ReceiveCallback), state);
}
catch (SocketException se)
{
OnError(MessageCode.ConnectionClosed, se.Message);
Disconnect();
}
}
void ProcessIncomingData(PacketState state)
{
if (state.IsPacketLength)
{
// First 4 bytes of a new packet.
state.PacketLength = BitConverter.ToInt32(state.Data, 0);
state.IsPacketLength = false;
state.BytesSoFar = 0;
state.Data = new byte[state.PacketLength];
if (state.PacketLength > 0)
{
StartToReceive(state);
}
else
{
OnError(MessageCode.EmptyPacket, null);
// Treat as a fatal error?
Disconnect();
}
}
else
{
// This is a fragment of a complete packet.
if (state.BytesSoFar < state.PacketLength)
{
// We don't have all the data, ask the network for the rest.
StartToReceive(state);
}
else
{
// This is the whole packet, so we can go ahead and pack it up into a structure and then punt it upstairs.
#if DEBUG
Console.WriteLine("Complete packet.");
#endif
RCONPacket ReturnedPacket = new RCONPacket();
ReturnedPacket.ParseFromBytes(state.Data, this);
ThreadPool.QueueUserWorkItem((object pool_state) =>
{
ProcessResponse(ReturnedPacket);
});
// Wait for new packet.
GetNewPacketFromServer();
}
}
}
