/// <summary>
/// Handle an incoming ConnectionSetup packet type
/// </summary>
/// <param name="packetDataSection">Serialised handshake data</param>
internal void ConnectionSetupHandler(MemoryStream packetDataSection)
{
//We should never be trying to handshake an established connection
ConnectionInfo remoteConnectionInfo = NetworkComms.InternalFixedSendReceiveOptions.DataSerializer.DeserialiseDataObject <ConnectionInfo>(packetDataSection,
NetworkComms.InternalFixedSendReceiveOptions.DataProcessors, NetworkComms.InternalFixedSendReceiveOptions.Options);
if (ConnectionInfo.ConnectionType != remoteConnectionInfo.ConnectionType)
{
connectionSetupException = true;
connectionSetupExceptionStr = "Remote connectionInfo provided connectionType did not match expected connection type.";
}
else
{
//We use the following bool to track a possible existing connection which needs closing
bool possibleClashWithExistingConnection = false;
Connection existingConnection = null;
//We first try to establish everything within this lock in one go
//If we can't quite complete the establish we have to come out of the lock at try to sort the problem
bool connectionEstablishedSuccess = ConnectionSetupHandlerFinal(remoteConnectionInfo, ref possibleClashWithExistingConnection, ref existingConnection);
//If we were not successful at establishing the connection we need to sort it out!
if (!connectionEstablishedSuccess && !connectionSetupException)
{
if (existingConnection == null)
{
throw new Exception("Connection establish issues and existingConnection was left as null.");
}
if (possibleClashWithExistingConnection)
{
//If we have a clash by endPoint we test the existing connection
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Existing connection with " + ConnectionInfo + ". Testing existing connection.");
}
if (existingConnection.ConnectionAlive(1000))
{
//If the existing connection comes back as alive we don't allow this one to go any further
//This might happen if two peers try to connect to each other at the same time
connectionSetupException = true;
connectionSetupExceptionStr = " ... existing live connection at provided end point for this connection (" + ConnectionInfo + "), there should be no need for a second.";
}
}
//We only try again if we did not log an exception
if (!connectionSetupException)
{
//Once we have tried to sort the problem we can try to finish the establish one last time
connectionEstablishedSuccess = ConnectionSetupHandlerFinal(remoteConnectionInfo, ref possibleClashWithExistingConnection, ref existingConnection);
//If we still failed then that's it for this establish
if (!connectionEstablishedSuccess && !connectionSetupException)
{
connectionSetupException = true;
connectionSetupExceptionStr = "Attempted to establish connection with " + ConnectionInfo + ", but due to an existing connection this was not possible.";
}
}
}
//If we are server side and we receive a successful connection setup we can respond to here
if (connectionEstablishedSuccess && ConnectionInfo.ServerSide)
{
SendObject(Enum.GetName(typeof(ReservedPacketType), ReservedPacketType.ConnectionSetup), new ConnectionInfo(ConnectionInfo.ConnectionType, NetworkComms.NetworkIdentifier, ConnectionInfo.LocalEndPoint, true), NetworkComms.InternalFixedSendReceiveOptions);
}
}
//Trigger any setup waits
connectionSetupWait.Set();
}
