private static void newListenerInstance_ConnectionReceived(StreamSocketListener sender, StreamSocketListenerConnectionReceivedEventArgs args)
{
try
{
var newConnectionInfo = new ConnectionInfo(true, ConnectionType.TCP, new IPEndPoint(IPAddress.Parse(args.Socket.Information.RemoteAddress.DisplayName.ToString()), int.Parse(args.Socket.Information.RemotePort)));
TCPConnection.GetConnection(newConnectionInfo, NetworkComms.DefaultSendReceiveOptions, args.Socket, true);
}
catch (ConfirmationTimeoutException)
{
//If this exception gets thrown its generally just a client closing a connection almost immediately after creation
}
catch (CommunicationException)
{
//If this exception gets thrown its generally just a client closing a connection almost immediately after creation
}
catch (ConnectionSetupException)
{
//If we are the server end and we did not pick the incoming connection up then tooo bad!
}
catch (SocketException)
{
//If this exception gets thrown its generally just a client closing a connection almost immediately after creation
}
catch (Exception ex)
{
//For some odd reason SocketExceptions don't always get caught above, so another check
if (ex.GetBaseException().GetType() != typeof(SocketException))
{
//Can we catch the socketException by looking at the string error text?
if (ex.ToString().StartsWith("System.Net.Sockets.SocketException"))
{
NetworkComms.LogError(ex, "ConnectionSetupError_SE");
}
else
{
NetworkComms.LogError(ex, "ConnectionSetupError");
}
}
}
}
internal static TCPConnection GetConnection(ConnectionInfo connectionInfo, SendReceiveOptions defaultSendReceiveOptions, TcpClient tcpClient, bool establishIfRequired = true)
#endif
{
connectionInfo.ConnectionType = ConnectionType.TCP;
//If we have a tcpClient at this stage we must be serverside
#if WINDOWS_PHONE
if (socket != null)
{
connectionInfo.ServerSide = true;
}
#else
if (tcpClient != null)
{
connectionInfo.ServerSide = true;
}
#endif
bool newConnection = false;
TCPConnection connection;
lock (NetworkComms.globalDictAndDelegateLocker)
{
//Check to see if a conneciton already exists, if it does return that connection, if not return a new one
if (NetworkComms.ConnectionExists(connectionInfo.RemoteEndPoint, connectionInfo.ConnectionType))
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Attempted to create new TCPConnection to connectionInfo='" + connectionInfo + "' but there is an existing connection. Existing connection will be returned instead.");
}
establishIfRequired = false;
connection = (TCPConnection)NetworkComms.GetExistingConnection(connectionInfo.RemoteEndPoint, connectionInfo.ConnectionType);
}
else
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Trace("Creating new TCPConnection to connectionInfo='" + connectionInfo + "'." + (establishIfRequired ? " Connection will be established." : " Connection will not be established."));
}
if (connectionInfo.ConnectionState == ConnectionState.Establishing)
{
throw new ConnectionSetupException("Connection state for connection " + connectionInfo + " is marked as establishing. This should only be the case here due to a bug.");
}
//If an existing connection does not exist but the info we are using suggests it should we need to reset the info
//so that it can be reused correctly. This case generally happens when using Comms in the format
//TCPConnection.GetConnection(info).SendObject(packetType, objToSend);
if (connectionInfo.ConnectionState == ConnectionState.Established || connectionInfo.ConnectionState == ConnectionState.Shutdown)
{
connectionInfo.ResetConnectionInfo();
}
//We add a reference to networkComms for this connection within the constructor
#if WINDOWS_PHONE
connection = new TCPConnection(connectionInfo, defaultSendReceiveOptions, socket);
#else
connection = new TCPConnection(connectionInfo, defaultSendReceiveOptions, tcpClient);
#endif
newConnection = true;
}
}
if (newConnection && establishIfRequired)
{
connection.EstablishConnection();
}
else if (!newConnection)
{
connection.WaitForConnectionEstablish(NetworkComms.ConnectionEstablishTimeoutMS);
}
if (!NetworkComms.commsShutdown)
{
TriggerConnectionKeepAliveThread();
}
return(connection);
}
/// <summary>
/// Establish the connection
/// </summary>
protected override void EstablishConnectionSpecific()
{
#if WINDOWS_PHONE
if (socket == null)
{
ConnectSocket();
}
//For the local endpoint
var localEndPoint = new IPEndPoint(IPAddress.Parse(socket.Information.LocalAddress.CanonicalName.ToString()), int.Parse(socket.Information.LocalPort));
//We should now be able to set the connectionInfo localEndPoint
ConnectionInfo.UpdateLocalEndPointInfo(localEndPoint);
//Set the outgoing buffer size
socket.Control.OutboundBufferSizeInBytes = (uint)NetworkComms.SendBufferSizeBytes;
#else
if (tcpClient == null)
{
ConnectSocket();
}
//We should now be able to set the connectionInfo localEndPoint
ConnectionInfo.UpdateLocalEndPointInfo((IPEndPoint)tcpClient.Client.LocalEndPoint);
//We are going to be using the networkStream quite a bit so we pull out a reference once here
tcpClientNetworkStream = tcpClient.GetStream();
//When we tell the socket/client to close we want it to do so immediately
//this.tcpClient.LingerState = new LingerOption(false, 0);
//We need to set the keep alive option otherwise the connection will just die at some random time should we not be using it
//NOTE: This did not seem to work reliably so was replaced with the keepAlive packet feature
//this.tcpClient.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, true);
tcpClient.ReceiveBufferSize = NetworkComms.ReceiveBufferSizeBytes;
tcpClient.SendBufferSize = NetworkComms.SendBufferSizeBytes;
//This disables the 'nagle alogrithm'
//http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.nodelay.aspx
//Basically we may want to send lots of small packets (<200 bytes) and sometimes those are time critical (e.g. when establishing a connection)
//If we leave this enabled small packets may never be sent until a suitable send buffer length threshold is passed. i.e. BAD
tcpClient.NoDelay = true;
tcpClient.Client.NoDelay = true;
#endif
//Start listening for incoming data
StartIncomingDataListen();
//Get a list of existing listeners
List <IPEndPoint> existingListeners = TCPConnection.ExistingLocalListenEndPoints(ConnectionInfo.LocalEndPoint.Address);
//Select a listener for this connection
IPEndPoint selectedExistingListener = null;
if (existingListeners.Count > 0)
{
selectedExistingListener = (existingListeners.Contains(ConnectionInfo.LocalEndPoint) ? ConnectionInfo.LocalEndPoint : existingListeners[0]);
}
//If we are server side and we have just received an incoming connection we need to return a conneciton id
//This id will be used in all future connections from this machine
if (ConnectionInfo.ServerSide)
{
if (selectedExistingListener == null)
{
throw new ConnectionSetupException("Detected a server side connection when an existing listener was not present.");
}
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Waiting for client connnectionInfo from " + ConnectionInfo);
}
//Wait for the client to send its identification
if (!connectionSetupWait.WaitOne(NetworkComms.ConnectionEstablishTimeoutMS))
{
throw new ConnectionSetupException("Timeout waiting for client connectionInfo with " + ConnectionInfo + ". Connection created at " + ConnectionInfo.ConnectionCreationTime.ToString("HH:mm:ss.fff") + ", its now " + DateTime.Now.ToString("HH:mm:ss.f"));
}
if (connectionSetupException)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Connection setup exception. ServerSide with " + ConnectionInfo + ", " + connectionSetupExceptionStr);
}
throw new ConnectionSetupException("ServerSide. " + connectionSetupExceptionStr);
}
//Trigger the connection establish delegates before replying to the connection establish
base.EstablishConnectionSpecific();
//Once we have the clients id we send our own
SendObject(Enum.GetName(typeof(ReservedPacketType), ReservedPacketType.ConnectionSetup), new ConnectionInfo(ConnectionType.TCP, NetworkComms.NetworkIdentifier, new IPEndPoint(ConnectionInfo.RemoteEndPoint.Address, selectedExistingListener.Port), true), NetworkComms.InternalFixedSendReceiveOptions);
}
else
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Sending connnectionInfo to " + ConnectionInfo);
}
//As the client we initiated the connection we now forward our local node identifier to the server
//If we are listening we include our local listen port as well
SendObject(Enum.GetName(typeof(ReservedPacketType), ReservedPacketType.ConnectionSetup), new ConnectionInfo(ConnectionType.TCP, NetworkComms.NetworkIdentifier, new IPEndPoint(ConnectionInfo.RemoteEndPoint.Address, (selectedExistingListener != null ? selectedExistingListener.Port : ConnectionInfo.LocalEndPoint.Port)), selectedExistingListener != null), NetworkComms.InternalFixedSendReceiveOptions);
//Wait here for the server end to return its own identifier
if (!connectionSetupWait.WaitOne(NetworkComms.ConnectionEstablishTimeoutMS))
{
throw new ConnectionSetupException("Timeout waiting for server connnectionInfo from " + ConnectionInfo + ". Connection created at " + ConnectionInfo.ConnectionCreationTime.ToString("HH:mm:ss.fff") + ", its now " + DateTime.Now.ToString("HH:mm:ss.f"));
}
//If we are client side we can update the localEndPoint for this connection to reflect what the remote end might see if we are also listening
if (selectedExistingListener != null)
{
ConnectionInfo.UpdateLocalEndPointInfo(selectedExistingListener);
}
if (connectionSetupException)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Connection setup exception. ClientSide with " + ConnectionInfo + ", " + connectionSetupExceptionStr);
}
throw new ConnectionSetupException("ClientSide. " + connectionSetupExceptionStr);
}
//Trigger the connection establish delegates once the server has replied to the connection establish
base.EstablishConnectionSpecific();
}
#if !WINDOWS_PHONE
//Once the connection has been established we may want to re-enable the 'nagle algorithm' used for reducing network congestion (apparently).
//By default we leave the nagle algorithm disabled because we want the quick through put when sending small packets
if (EnableNagleAlgorithmForNewConnections)
{
tcpClient.NoDelay = false;
tcpClient.Client.NoDelay = false;
}
#endif
}
