/// <summary>
/// Attempts to complete the connection establish with a minimum of locking to avoid possible deadlocking
/// </summary>
/// <param name="remoteConnectionInfo"><see cref="ConnectionInfo"/> corresponding with remoteEndPoint</param>
/// <param name="possibleClashWithExistingConnection">True if a connection already exists with provided remoteEndPoint</param>
/// <param name="existingConnection">A reference to an existing connection if it exists</param>
/// <returns>True if connection is successfully setup, otherwise false</returns>
private bool ConnectionSetupHandlerFinal(ConnectionInfo remoteConnectionInfo, ref bool possibleClashWithExistingConnection, ref Connection existingConnection)
{
lock (NetworkComms.globalDictAndDelegateLocker)
{
List <Connection> connectionByEndPoint = NetworkComms.GetExistingConnection(ConnectionInfo.RemoteEndPoint, ConnectionInfo.LocalEndPoint, ConnectionInfo.ConnectionType, ConnectionInfo.ApplicationLayerProtocol);
//If we no longer have the original endPoint reference (set in the constructor) then the connection must have been closed already
if (connectionByEndPoint.Count == 0)
{
connectionSetupException = true;
connectionSetupExceptionStr = "Connection setup received after connection closure with " + ConnectionInfo;
}
else
{
//COMMENT: As of version 3.0.0 we have allowed loop back connections where the identifier is the same
//We need to check for a possible GUID clash
//Probability of a clash is approx 0.1% if 1E19 connections are maintained simultaneously (This many connections has not be tested ;))
//but hey, we live in a crazy world!
//if (remoteConnectionInfo.NetworkIdentifier == NetworkComms.NetworkIdentifier)
//{
// connectionSetupException = true;
// connectionSetupExceptionStr = "Remote peer has same network identifier to local, " + remoteConnectionInfo.NetworkIdentifier + ". A real duplication is vanishingly improbable so this exception has probably been thrown because the local and remote application are the same.";
//}
//else
if (connectionByEndPoint[0] != this)
{
possibleClashWithExistingConnection = true;
existingConnection = connectionByEndPoint[0];
}
else if (connectionByEndPoint[0].ConnectionInfo.NetworkIdentifier != ShortGuid.Empty &&
connectionByEndPoint[0].ConnectionInfo.NetworkIdentifier != remoteConnectionInfo.NetworkIdentifier)
{
//We are in the same connection, so don't need to throw and exception but the remote network identifier
//has changed.
//This can happen for connection types where the local connection (this) may not have been closed
//when the remote peer closed. We need to trigger the connection close delegates with the old info, update
//the connection info and then call the establish delegates
#region Reset Connection without closing
//Call the connection close delegates
try
{
//Almost there
//Last thing is to call any connection specific shutdown delegates
if (ConnectionSpecificShutdownDelegate != null)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Triggered connection specific shutdown delegates with " + ConnectionInfo);
}
ConnectionSpecificShutdownDelegate(this);
}
}
catch (Exception ex)
{
LogTools.LogException(ex, "ConnectionSpecificShutdownDelegateError", "Error while executing connection specific shutdown delegates for " + ConnectionInfo + ". Ensure any shutdown exceptions are caught in your own code.");
}
try
{
//Last but not least we call any global connection shutdown delegates
if (NetworkComms.globalConnectionShutdownDelegates != null)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Triggered global shutdown delegates with " + ConnectionInfo);
}
NetworkComms.globalConnectionShutdownDelegates(this);
}
}
catch (Exception ex)
{
LogTools.LogException(ex, "GlobalConnectionShutdownDelegateError", "Error while executing global connection shutdown delegates for " + ConnectionInfo + ". Ensure any shutdown exceptions are caught in your own code.");
}
EndPoint newRemoteEndPoint;
if (this.ConnectionInfo.RemoteEndPoint.GetType() == typeof(IPEndPoint) &&
remoteConnectionInfo.LocalEndPoint.GetType() == typeof(IPEndPoint))
{
newRemoteEndPoint = new IPEndPoint(this.ConnectionInfo.RemoteIPEndPoint.Address, remoteConnectionInfo.LocalIPEndPoint.Port);
}
else
{
throw new NotImplementedException("ConnectionSetupHandlerFinal not implemented for EndPoints of type " + this.ConnectionInfo.RemoteEndPoint.GetType());
}
NetworkComms.UpdateConnectionReferenceByEndPoint(this, newRemoteEndPoint, this.ConnectionInfo.LocalEndPoint);
ConnectionInfo.UpdateInfoAfterRemoteHandshake(remoteConnectionInfo, newRemoteEndPoint);
//Trigger the establish delegates
TriggerConnectionEstablishDelegates();
#endregion
return(true);
}
else
{
//Update the connection info
//We never change the this.ConnectionInfo.RemoteEndPoint.Address as there might be NAT involved
//We may update the port however
EndPoint newRemoteEndPoint;
if (this is IPConnection)
{
newRemoteEndPoint = new IPEndPoint(this.ConnectionInfo.RemoteIPEndPoint.Address, remoteConnectionInfo.LocalIPEndPoint.Port);
}
#if NET35 || NET4
else if (this is BluetoothConnection)
{
newRemoteEndPoint = ConnectionInfo.RemoteBTEndPoint;
}
#endif
else
{
throw new NotImplementedException("ConnectionSetupHandlerFinal not implemented for EndPoints of type " + this.ConnectionInfo.RemoteEndPoint.GetType());
}
NetworkComms.UpdateConnectionReferenceByEndPoint(this, newRemoteEndPoint, this.ConnectionInfo.LocalEndPoint);
ConnectionInfo.UpdateInfoAfterRemoteHandshake(remoteConnectionInfo, newRemoteEndPoint);
return(true);
}
}
}
return(false);
}
/// <summary>
/// Closes the connection and trigger any associated shutdown delegates.
/// </summary>
/// <param name="closeDueToError">Closing a connection due an error possibly requires a few extra steps.</param>
/// <param name="logLocation">Optional debug parameter.</param>
public void CloseConnection(bool closeDueToError, int logLocation = 0)
{
try
{
if (NetworkComms.LoggingEnabled)
{
if (closeDueToError)
{
NetworkComms.Logger.Debug("Closing connection with " + ConnectionInfo + " due to error from [" + logLocation.ToString() + "].");
}
else
{
NetworkComms.Logger.Debug("Closing connection with " + ConnectionInfo + " from [" + logLocation.ToString() + "].");
}
}
ConnectionInfo.NoteConnectionShutdown();
//Set possible error cases
if (closeDueToError)
{
connectionSetupException = true;
connectionSetupExceptionStr = "Connection was closed during setup from [" + logLocation.ToString() + "].";
}
//Ensure we are not waiting for a connection to be established if we have died due to error
connectionSetupWait.Set();
//Call any connection specific close requirements
CloseConnectionSpecific(closeDueToError, logLocation);
try
{
//If we are calling close from the listen thread we are actually in the same thread
//We must guarantee the listen thread stops even if that means we need to nuke it
//If we did not we may not be able to shutdown properly.
if (incomingDataListenThread != null && incomingDataListenThread != Thread.CurrentThread && (incomingDataListenThread.ThreadState == System.Threading.ThreadState.WaitSleepJoin || incomingDataListenThread.ThreadState == System.Threading.ThreadState.Running))
{
//If we have made it this far we give the ythread a further 50ms to finish before nuking.
if (!incomingDataListenThread.Join(50))
{
incomingDataListenThread.Abort();
if (NetworkComms.LoggingEnabled && ConnectionInfo != null)
{
NetworkComms.Logger.Warn("Incoming data listen thread with " + ConnectionInfo + " aborted.");
}
}
}
}
catch (Exception)
{
}
//Close connection my get called multiple times for a given connection depending on the reason for being closed
bool firstClose = NetworkComms.RemoveConnectionReference(this);
try
{
//Almost there
//Last thing is to call any connection specific shutdown delegates
if (firstClose && ConnectionSpecificShutdownDelegate != null)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Triggered connection specific shutdown delegates with " + ConnectionInfo);
}
ConnectionSpecificShutdownDelegate(this);
}
}
catch (Exception ex)
{
NetworkComms.LogError(ex, "ConnectionSpecificShutdownDelegateError", "Error while executing connection specific shutdown delegates for " + ConnectionInfo + ". Ensure any shutdown exceptions are caught in your own code.");
}
try
{
//Last but not least we call any global connection shutdown delegates
if (firstClose && NetworkComms.globalConnectionShutdownDelegates != null)
{
if (NetworkComms.LoggingEnabled)
{
NetworkComms.Logger.Debug("Triggered global shutdown delegates with " + ConnectionInfo);
}
NetworkComms.globalConnectionShutdownDelegates(this);
}
}
catch (Exception ex)
{
NetworkComms.LogError(ex, "GlobalConnectionShutdownDelegateError", "Error while executing global connection shutdown delegates for " + ConnectionInfo + ". Ensure any shutdown exceptions are caught in your own code.");
}
}
catch (Exception ex)
{
if (ex is ThreadAbortException)
{ /*Ignore the threadabort exception if we had to nuke a thread*/
}
else
{
NetworkComms.LogError(ex, "NCError_CloseConnection", "Error closing connection with " + ConnectionInfo + ". Close called from " + logLocation.ToString() + (closeDueToError ? " due to error." : "."));
}
//We try to rethrow where possible but CloseConnection could very likely be called from within networkComms so we just have to be happy with a log here
}
}
