private void ProcessKeepalive(byte[] data)
{
try
{
var keepalive = BinaryPrimitives.ReadUInt64LittleEndian(data);
if (!KeepaliveTimestamps.TryRemove(keepalive, out var timestamp))
{
return;
}
var tdelta = (int)(((Stopwatch.GetTimestamp() - timestamp) / (double)Stopwatch.Frequency) * 1000);
Volatile.Write(ref _wsPing, tdelta);
Discord.DebugLogger.LogMessage(LogLevel.Debug, "VNext UDP", $"Received UDP keepalive {keepalive}, ping {tdelta}ms", DateTime.Now);
}
catch (Exception ex)
{
Discord.DebugLogger.LogMessage(LogLevel.Error, "VNext UDP", "Exception occured when handling keepalive", DateTime.Now, ex);
}
}
private async Task KeepaliveAsync()
{
await Task.Yield();
var token = KeepaliveToken;
var client = UdpClient;
while (!token.IsCancellationRequested)
{
var timestamp = Stopwatch.GetTimestamp();
var keepalive = Volatile.Read(ref _lastKeepalive);
Volatile.Write(ref _lastKeepalive, keepalive + 1);
KeepaliveTimestamps.TryAdd(keepalive, timestamp);
var packet = new byte[8];
BinaryPrimitives.WriteUInt64LittleEndian(packet, keepalive);
await client.SendAsync(packet, packet.Length).ConfigureAwait(false);
await Task.Delay(5000, token);
}
}
