internal async Task <WebSocketStream> AcceptAsync()
{
// Performance: Address Resolution (ARP) work-around: When we receive the control message from a TCP connection which hasn't had any
// outbound traffic for 2 minutes the ARP cache no longer has the MAC address required to ACK the control message. If we also begin
// connecting a new socket at exactly the same time there's a known race condition (insert link here) where ARP can only resolve one
// address at a time, which causes the loser of the race to have to retry after 3000ms. To avoid the 3000ms delay we just pause for
// a few ms here instead.
await Task.Delay(TimeSpan.FromMilliseconds(2)).ConfigureAwait(false);
var clientWebSocket = this.CreateWebSocket();
// If we are accepting a sub-protocol handle that here
var subProtocol = this.Response.Headers[HybridConnectionConstants.Headers.SecWebSocketProtocol];
if (!string.IsNullOrEmpty(subProtocol))
{
clientWebSocket.Options.AddSubProtocol(subProtocol);
}
using (var cancelSource = new CancellationTokenSource(AcceptTimeout))
{
await clientWebSocket.ConnectAsync(this.wssRendezvousAddress, cancelSource.Token).ConfigureAwait(false);
}
var webSocketStream = new WebSocketStream(clientWebSocket, this.TrackingContext);
return(webSocketStream);
}
public async Task AcceptConnectionAsync()
{
try
{
// Performance: Address Resolution (ARP) work-around: When we receive the control message from a TCP connection which hasn't had any
// outbound traffic for 2 minutes the ARP cache no longer has the MAC address required to ACK the control message. If we also begin
// connecting a new socket at exactly the same time there's a known race condition (insert link here) where ARP can only resolve one
// address at a time, which causes the loser of the race to have to retry after 3000ms. To avoid the 3000ms delay we just pause for
// a few ms here instead.
await Task.Delay(TimeSpan.FromMilliseconds(2)).ConfigureAwait(false);
var timeoutHelper = new TimeoutHelper(AcceptTimeout);
var clientWebSocket = new ClientWebSocket45();
clientWebSocket.Options.SetBuffer(this.bufferSize, this.bufferSize);
clientWebSocket.Options.Host = this.Address.Host;
clientWebSocket.Options.Proxy = this.listener.Proxy;
clientWebSocket.Options.KeepAliveInterval = HybridConnectionConstants.KeepAliveInterval;
using (var cancelSource = new CancellationTokenSource(timeoutHelper.RemainingTime()))
{
await clientWebSocket.ConnectAsync(this.rendezvousAddress, cancelSource.Token).ConfigureAwait(false);
}
var webSocketStream = new WebSocketStream(clientWebSocket, this.TrackingContext);
this.AcceptSucceeded(webSocketStream);
}
catch (Exception exception)
{
if (Fx.IsFatal(exception))
{
throw;
}
this.AcceptFailed(exception);
}
}
