private void HandleUDPMessage(Guid fromGuid, IPEndPoint endpoint, MessageType messageType, byte[] data)
{
UDPSibling udps = null;
foreach (UDPSibling udpsother in udpSiblings)
{
if (udpsother.guid == fromGuid)
{
udps = udpsother;
break;
}
}
if (udps == null)
{
Console.WriteLine("Received UDP message from unknown client");
return;
}
switch (messageType)
{
case MessageType.DISCOVER:
HandleUDPDiscover(udps, endpoint, data);
break;
case MessageType.NTP_MESSAGE:
HandleUDPNTP(udps, data);
break;
case MessageType.NTP_COMPLETE:
HandleUDPNTPComplete(udps, data);
break;
}
}
private void SendUDPNTP(UDPSibling udps)
{
using (MessageWriter mw = new MessageWriter())
{
mw.Write <long>(DateTime.UtcNow.Ticks);
SendUDPMessage(udps, MessageType.NTP_MESSAGE, mw.GetMessageBytes());
}
}
private void SendUDPDiscover(UDPSibling udps, bool isResponse)
{
using (MessageWriter mw = new MessageWriter())
{
mw.Write <bool>(isResponse);
SendUDPMessage(udps, MessageType.DISCOVER, mw.GetMessageBytes());
}
}
private void AddClient(IPEndPoint endpoint, Guid udpAddress)
{
UDPSibling udps = new UDPSibling();
udps.guid = udpAddress;
udps.endpoint = endpoint;
lock (udpSiblings)
{
udpSiblings.Add(udps);
}
}
private void HandleUDPNTPComplete(UDPSibling udps, byte[] data)
{
using (MessageReader mr = new MessageReader(data))
{
long sendTime = mr.Read <long>();
long peerTime = mr.Read <long>();
long receiveTime = DateTime.UtcNow.Ticks;
udps.rtt = receiveTime - sendTime;
udps.clockDiff = (sendTime + (udps.rtt / 2)) - peerTime;
}
}
private void HandleUDPDiscover(UDPSibling udps, IPEndPoint endpoint, byte[] data)
{
udps.isConnected = true;
udps.endpoint = endpoint;
using (MessageReader mr = new MessageReader(data))
{
bool isResponse = mr.Read <bool>();
if (!isResponse)
{
SendUDPDiscover(udps, true);
}
}
}
private void HandleUDPNTP(UDPSibling udps, byte[] data)
{
using (MessageReader mr = new MessageReader(data))
{
long sendTime = mr.Read <long>();
long peerTime = DateTime.UtcNow.Ticks;
using (MessageWriter mw = new MessageWriter())
{
mw.Write <long>(sendTime);
mw.Write <long>(peerTime);
SendUDPMessage(udps, MessageType.NTP_COMPLETE, mw.GetMessageBytes());
}
}
}
private void RemoveClient(Guid udpAddress)
{
UDPSibling udps = null;
lock (udpSiblings)
{
foreach (UDPSibling udpsother in udpSiblings)
{
if (udpsother.guid == udpAddress)
{
udps = udpsother;
break;
}
}
udpSiblings.Remove(udps);
}
}
//This really isn't at all thought out, but I'm going to leave it now because.
private void SendUDPMessage(UDPSibling udps, MessageType mt, byte[] data)
{
byte[] sendData = null;
using (MessageWriter mw = new MessageWriter())
{
mw.Write <byte[]>(udpAddress.ToByteArray());
mw.Write <int>((int)mt);
if (data == null || data.Length == 0)
{
mw.Write <int>(0);
}
else
{
mw.Write <int>(data.Length);
mw.Write <byte[]>(data);
}
sendData = mw.GetMessageBytes();
}
udpClient.Send(sendData, sendData.Length, udps.endpoint);
}
