private void ProcessConnectRsAck(StandardConnectRsAckPacket packet)
{
TcpConnectionHolder conn = null;
try
{
conn = _tcpConnections.GetRemoteConnection(packet.ConnectionId);
try
{
conn.Connection.Open();
conn.StopTimerToOpen();
}
catch (Exception e)
{
Logger.Error("Error starting connection [" + conn.Connection.ConnectionId + "] : " + e.Message);
if (conn != null)
{
conn.Connection.Close();
}
}
}
catch (ConnectionException e)
{
Logger.Error("Dropping connect rs ack packet [" + packet + "], failed to get a connection : " + e.Message);
}
}
private void ProcessDataPacket(StandardTcpDataPacket packet)
{
try
{
TcpConnectionHolder conn = _tcpConnections.GetRemoteConnection(packet.ConnectionId);
// If the connect response ack packet was lost, its possible that this connection is not open, we need to open it now
if (!conn.Connection.Established)
{
Logger.Debug("Outgoing Connection [" + conn.Connection.ConnectionId + "] received data, means our connect rs ack was lost, auto opening");
conn.Connection.Open();
}
// Lock receiving while we process this packet (we will still be able to send)
// Now TcpConnection doesn't have to be threadsafe, but each connection
// can process data independently at full speed.
lock (conn.ReceiveLock)
{
// now process the dataPacket;
conn.Connection.ProcessDataPacket(packet);
}
}
catch (ConnectionException e)
{
Logger.Error("Dropping data packet [" + packet + "], failed to get a connection : " + e.Message);
}
}
internal TcpConnectionHolder[] GetActiveConnectionList()
{
lock (_connectionLock)
{
TcpConnectionHolder[] list = new TcpConnectionHolder[_localOpenConnectionList.Count];
_localOpenConnectionList.Values.CopyTo(list, 0);
return(list);
}
}
private void ProcessDisconnectPacket(StandardDisconnectPacket packet)
{
// immediately acknowlege that we got it (with remote connection id as the connection id)
SendData(new StandardDisconnectAckPacket(packet.ConnectionId));
// if we are not disconnecting, start the process.
try
{
// do we have it in our list?
TcpConnectionHolder connectionHolder = _tcpConnections.GetRemoteConnection(packet.ConnectionId);
// this method will send the disconnectRs packet
connectionHolder.Connection.ProcessDisconnect(packet);
}
catch (Exception e)
{
Logger.Error("Failed to close connection [remote id = " + packet.ConnectionId + "] : " + e.Message);
}
}
internal TcpConnectionHolder Remove(byte localConnectionId)
{
TcpConnectionHolder holder = null;
lock (_connectionLock)
{
if (_localOpenConnectionList.TryGetValue(localConnectionId, out holder))
{
_localOpenConnectionList.Remove(localConnectionId);
if (_remoteLocalIdMap.ContainsKey(holder.Connection.RemoteConnectionId))
{
_remoteLocalIdMap.Remove(holder.Connection.RemoteConnectionId);
}
Logger.Debug("Removed connection " + localConnectionId + " to from lists.");
}
}
return(holder);
}
private void ProcessAckPacket(StandardAckPacket packet)
{
try
{
TcpConnectionHolder conn = _tcpConnections.GetRemoteConnection(packet.ConnectionId);
// Lock sending while we process this packet (we will still be able to receive)
// Now TcpConnection doesn't have to be threadsafe, but each connection
// can process acks independently at full speed.
lock (conn.SendLock)
{
// now process the ackPacket;
conn.Connection.ProcessAck(packet);
}
}
catch (ConnectionException e)
{
Logger.Error("Dropping ack packet [" + packet + "], failed to get a connection : " + e.Message);
}
}
internal TcpConnectionHolder[] GetActiveConnectionList()
{
lock (_connectionLock)
{
TcpConnectionHolder[] list = new TcpConnectionHolder[_localOpenConnectionList.Count];
_localOpenConnectionList.Values.CopyTo(list, 0);
return list;
}
}
private void ProcessNamedConnectionRequest(StandardNamedConnectRqPacket packet)
{
StandardNamedConnectRsPacket response = new StandardNamedConnectRsPacket
{
ConnectionId = packet.ConnectionId
};
// By default the conn id going back is the conn id of the request
// this will change if the connection is a success, then it will be our conn id.
lock (_receiveConnectLock)
{
// If this connection exists
if (_tcpConnections.IsRemoteConnection(packet.ConnectionId))
{
Logger.Debug("Request for connection id [" + packet.ConnectionId + "] already established, resending response");
TcpConnectionHolder tcpConnectionHolder = _tcpConnections.GetRemoteConnection(packet.ConnectionId);
response.RemoteConnectionId = tcpConnectionHolder.Connection.ConnectionId;
response.ProtocolId = tcpConnectionHolder.Connection.ProtocolId;
response.Sequence = tcpConnectionHolder.Connection.NextSeqToSend;
// we can respond that we are already established here
response.Success = true;
}
else
{
lock (_listeningNamedTCPEndPoints)
{
if (_listeningNamedTCPEndPoints.ContainsKey(packet.ConnectionName))
{
byte localConnectionId = GetNextConnectionId();
Logger.Debug("Found a listener for " + packet.ConnectionName + " connecting local conn [" + localConnectionId + "] to remote conn [" + packet.ConnectionId + "]");
byte agreedProtocolId = packet.ProtocolId;
if (packet.ProtocolId > MaxSupportedProtocolId)
{
Logger.Debug("They wanted protocol " + packet.ProtocolId + ", but I only support up to " + MaxSupportedProtocolId + ", so I propose it.");
agreedProtocolId = MaxSupportedProtocolId;
}
Logger.Debug("I have agreed to protocol " + agreedProtocolId);
response.ProtocolId = agreedProtocolId;
response.Sequence = (ushort)(_rand.Next(ushort.MaxValue));
ITcpTransportLayer connection = null;
switch (agreedProtocolId)
{
case (2):
{
connection = new TcpTransportLayerSlidingWindow(this, localConnectionId, packet.ConnectionId, response.Sequence, packet.Sequence);
break;
}
default:
{
Logger.Error("Failed to agree on a tcp protocol, I don't support " + agreedProtocolId);
break;
}
}
if (connection != null)
{
// only add the connection if
response.Success =
_listeningNamedTCPEndPoints[packet.ConnectionName].ConnectCallback(connection.Socket);
if (response.Success)
{
// set it up to tie up loose ends when the connection dies
connection.ConnectionClose += ConnectionOnConnectionClose;
_tcpConnections.Add(connection);
response.RemoteConnectionId = localConnectionId;
}
}
else
{
response.Success = false;
}
}
else
{
Logger.Warn("No listener for " + packet.ConnectionName);
response.Success = false;
}
}
}
}
Logger.Debug("Sending connection response : " + response);
SendData(response);
if (response.Success)
{
// This sends a positive response, we would like to get an Ack of this connection response
// which will open this connection, but should that ack not arrive, let set a timer to automatically
// open this connection after 10 seconds
// we know that the sender will retry the connection should it not receive our response.
_tcpConnections.GetLocalOpenConnection(response.RemoteConnectionId).StartTimerToOpen();
}
}
