/// <summary>
/// Tries to pre-process a datagram without further parsing and processing.
/// </summary>
/// <param name="processor"> The inbound processor for the datagram to be pre-processed. </param>
/// <returns> True if it was pre-processed and no further processing is needed; false otherwise. </returns>
private bool TryPreProcessInboundDatagram(InboundProcessor processor)
{
if (!processor.ValidateLength())
{
this.rconClient.OnConnectionProblem(new ConnectionProblemEventArgs(ConnectionProblemType.InvalidLength));
this.Log.Trace("INVALID datagram received");
return true;
}
this.Metrics.InboundDatagramCount++;
#if DEBUG
if (processor.IsShutDownDatagram && this.ShutdownReason == ShutdownReason.None)
{
this.Log.Trace("SHUTDOWN DATAGRAM RECEIVED - SHUTTING DOWN.");
this.ShutdownReason = ShutdownReason.ServerRequested;
return true;
}
#endif
if (processor.TryPreProcess(this.DiscardConsoleMessages, this.ConMsgsTracker, this.CmdsTracker))
{
return true;
}
if (!processor.VerifyCrc())
{
this.rconClient.OnConnectionProblem(new ConnectionProblemEventArgs(ConnectionProblemType.Corrupted));
return true;
}
return false;
}
private async Task ReceiveDatagramAsync()
{
this.Log.Trace("BEFORE await ReceiveAsync");
// ReceiveAsync (BeginRead) will spawn a new thread
// which blocks head-on against the IO Completion Port
// http://msdn.microsoft.com/en-us/library/windows/desktop/aa364986(v=vs.85).aspx
UdpReceiveResult result = await this.UdpClient.ReceiveAsync()
//// do not incurr ANOTHER context switch cost
.ConfigureAwait(false);
// Async continuation; we are probably in a different thread now
this.Log.Trace("AFTER await ReceiveAsync");
var processor = new InboundProcessor(result.Buffer, this.datagramSender, this.Log);
if (this.TryPreProcessInboundDatagram(processor))
{
return;
}
var concreteDgram = processor.Parse();
this.Metrics.ParsedDatagramsCount++;
this.Dispatch(concreteDgram);
}