/// <summary>
/// Start asychronouse peer port connection listener.
/// </summary>
/// <param name="agent"></param>
/// <param name="port"></param>
public void StartListening(AgentConnector connector)
{
Log.Logger.Info("Port connection listener starting...");
_listenerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
_listenerSocket.Bind(new IPEndPoint(IPAddress.Any, listenPort));
_listenerSocket.Listen(100);
_listenerSocket.BeginAccept(new AsyncCallback(AcceptAsyncHandler), connector);
}
/// <summary>
/// Connect with remote peer and add it to the swarm when its callback handler is called.
/// </summary>
/// <param name="ip"></param>
/// <param name="port"></param>
/// <returns></returns>
public void Connect(AgentConnector connector)
{
IPAddress localPeerIP = Dns.GetHostEntry("localhost").AddressList[0];
IPAddress remotePeerIP = System.Net.IPAddress.Parse(connector.peerDetails.ip);
connector.socket = new Socket(localPeerIP.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
connector.socket.BeginConnect(new IPEndPoint(remotePeerIP, connector.peerDetails.port), new AsyncCallback(ConnectionAsyncHandler), connector);
}
/// <summary>
/// Asynchronous peer connection callback. When a connection
/// is completed try to add it to the swarm via the connector
/// passed as a parameter.
/// </summary>
/// <param name="ar"></param>
private void ConnectionAsyncHandler(IAsyncResult ar)
{
AgentConnector connector = (AgentConnector)ar.AsyncState;
try
{
connector.socket.EndConnect(ar);
connector.callBack(connector);
}
catch (Exception ex)
{
connector.socket?.Close();
Log.Logger.Error("Error (Ignored): " + ex.Message);
}
}
internal static int listenPort = Host.DefaultPort; // Listener port
/// <summary>
/// Asynchronous remote peer connection callback. When a remote connection
/// arrives try to add it to the swarm via the connector passed then prime
/// the accept callback for the next peers connection attempt.
/// </summary>
/// <param name="ar"></param>
private void AcceptAsyncHandler(IAsyncResult ar)
{
AgentConnector connector = (AgentConnector)ar.AsyncState;
try
{
connector.socket = _listenerSocket.EndAccept(ar);
connector.callBack(connector.Copy());
_listenerSocket.BeginAccept(new AsyncCallback(AcceptAsyncHandler), connector);
}
catch (Exception ex)
{
connector.socket?.Close();
Log.Logger.Error(ex);
Log.Logger.Info("Port connection listener terminated.");
}
}