private PRSMessage ReceiveResponse()
{
// NOTE: ignoring server's end point because we know who we sent it to
EndPoint remoteEP = new IPEndPoint(IPAddress.Any, 0);
return(PRSMessage.ReceiveMessage(clientSocket, ref remoteEP));
}
private static void KeepAliveThreadProc(object param)
{
// this method is called on the KeepAliveThread
PRSClient prs = (PRSClient)param;
prs.keepAliveRunning = true;
while (prs.keepAliveRunning)
{
// send the keep alive to the PRS for this client's port
prs.SendMessage(new PRSMessage(PRSMessage.MESSAGE_TYPE.KEEP_ALIVE, prs.serviceName, prs.portNumber, PRSMessage.STATUS.SUCCESS));
PRSMessage response = prs.ReceiveResponse();
// if we receive a failure to keep this port alive, assume there's a serious failure and stop
if (response.Status != PRSMessage.STATUS.SUCCESS)
{
prs.keepAliveRunning = false;
prs.keepAliveThread = null;
prs.keepAliveTimeout = 0;
Console.WriteLine("Failed to keep port alive for service " + prs.serviceName + ", error " + response.Status.ToString());
return;
}
// sleep until half the timeout passes, before sending again
try
{
Thread.Sleep(prs.keepAliveTimeout * 1000 / 2);
}
catch (ThreadInterruptedException)
{
// Note: Nothing to do here... we expect to receive this exception when ClosePort() is called
}
}
}
public static PRSMessage ReceiveMessage(Socket sock, ref EndPoint fromEP)
{
byte[] buffer = new byte[MSG_SIZE];
int result = sock.ReceiveFrom(buffer, ref fromEP);
PRSMessage msg = new PRSMessage(buffer);
Console.WriteLine("Received " + result.ToString() + " bytes: " + msg.ToString());
return(msg);
}
public ushort LookupPort()
{
// send lookup to server for our service name
SendMessage(new PRSMessage(PRSMessage.MESSAGE_TYPE.LOOKUP_PORT, serviceName, 0, PRSMessage.STATUS.SUCCESS));
// receive server's response and retrieve the port
PRSMessage response = ReceiveResponse();
if (response.Status == PRSMessage.STATUS.SUCCESS)
{
return(response.Port);
}
throw new Exception("Failed to lookup port for service " + serviceName + ", error " + response.Status.ToString());
}
public ushort RequestPort()
{
// send request to server for our service name
SendMessage(new PRSMessage(PRSMessage.MESSAGE_TYPE.REQUEST_PORT, serviceName, 0, PRSMessage.STATUS.SUCCESS));
// receive server's response and retrieve the port
PRSMessage response = ReceiveResponse();
if (response.Status == PRSMessage.STATUS.SUCCESS)
{
portNumber = response.Port;
return(response.Port);
}
throw new Exception("Failed to request port for service " + serviceName + ", error " + response.Status.ToString());
}
public void ClosePort()
{
// if the keep alive thread is running, then stop it before closing the port
if (keepAliveRunning)
{
keepAliveRunning = false;
keepAliveThread.Interrupt();
keepAliveThread = null;
keepAliveTimeout = 0;
}
// send close port to server for our service name and port number
SendMessage(new PRSMessage(PRSMessage.MESSAGE_TYPE.CLOSE_PORT, serviceName, portNumber, PRSMessage.STATUS.SUCCESS));
// expect success
PRSMessage response = ReceiveResponse();
if (response.Status != PRSMessage.STATUS.SUCCESS)
{
throw new Exception("Failed to close port " + portNumber.ToString() + ", for service " + serviceName + ", error " + response.Status.ToString());
}
}
private void SendMessage(PRSMessage msg)
{
msg.SendMessage(clientSocket, endPt);
}
