private void ProcessUdpTransferFrame(UdpTransferFrame frame)
{
this.UpdateKeepAlive();
switch (frame.Type)
{
case FrameType.ClientPing:
this.log.Debug($"[Client:{this.state.ClientId} => Server] PING");
var cmdClientPing = new ClientPingMessage(frame.MessageBuffer);
var now = TimeSpan.FromTicks(DateTime.UtcNow.Ticks);
var msgServerPong = new ServerPongMessage()
{
ClientRequestTimestamp = cmdClientPing.ClientTimestamp, ClientResponseTimestamp = now, ServerTimestamp = now
};
this.SendFrameToClient(FrameType.ServerPong, msgServerPong.Serialize());
break;
case FrameType.ClientPong:
this.log.Debug($"[Client:{this.state.ClientId} => Server] PONG");
var msgClientPong = new ClientPongMessage(frame.MessageBuffer);
this.CalculateClientLatency(msgClientPong);
break;
case FrameType.Message:
this.reliableClientMessaging.ProcessMessageFrame(frame);
break;
}
}
/// <summary>
/// TimeOffset = (t1 - t0) - (t2 - t3)
/// Rountrip = (t3 - t0) - (t2 - t1)
/// t0 is the client's timestamp of the request packet transmission,
/// t1 is the server's timestamp of the request packet reception,
/// t2 is the server's timestamp of the response packet transmission and
/// t3 is the client's timestamp of the response packet reception.
/// </summary>
private void CalculateClientLatency(ClientPongMessage msg)
{
var t0 = msg.ServerRequestTimestamp;
var t1 = msg.ClientRequestTimestamp;
var t2 = msg.ClientResponseTimestamp;
var t3 = TimeSpan.FromTicks(DateTime.UtcNow.Ticks);
this.state.Latency = TimeSpan.FromTicks(((t1 - t0) + (t3 - t2)).Ticks / 2);
}
/// <summary>Processes the UDP transfer frame.</summary>
/// <param name="frame">The frame.</param>
private void ProcessUdpTransferFrame(UdpTransferFrame frame)
{
switch (frame.Type)
{
case FrameType.ServerAuthenticationRequest:
var msgAuthenticationRequest = new ServerAuthenticationRequest(frame.MessageBuffer);
ProcessAuthenticationRequest(msgAuthenticationRequest, this.signingKeyBase64);
break;
case FrameType.ServerHello:
SubscribeToDefaultArea();
if (OnConnected != null)
{
Thread connected = new Thread(() => OnConnected());
connected.Start();
}
break;
case FrameType.ServerPing:
var msgServerPing = new ServerPingMessage(frame.MessageBuffer);
var now = TimeSpan.FromTicks(DateTime.UtcNow.Ticks);
var cmdClientPong = new ClientPongMessage()
{
ServerRequestTimestamp = msgServerPing.ServerTimestamp, ClientRequestTimestamp = now, ClientResponseTimestamp = now
};
ReliableMessaging.OnSendFrame(new UdpTransferFrame(FrameType.ClientPong, cmdClientPong.Serialize()));
break;
case FrameType.Message:
LastMessageReceived = DateTime.Now;
ReliableMessaging.ProcessMessageFrame(frame);
break;
default:
throw new NotImplementedException(frame.Type.ToString());
}
}
