private async Task StartListeningAsync(UdpConnection connection)
{
try
{
var transportTask = connection.StartAsync();
await transportTask;
connection.Dispose();
}
catch (Exception ex)
{
_logger.LogCritical(ex, $"Unexpected exception in {nameof(UdpTransport)}.{nameof(StartListeningAsync)}.", null);
}
}
public Task BindAsync()
{
List <UdpConnection> connections = new List <UdpConnection>();
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, _udpConfiguration.ReceivePort);
for (var schedulerIndex = 0; schedulerIndex < _numSchedulers; schedulerIndex++)
{
try
{
Socket listenSocket = new Socket(endPoint.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
Extensions.DisableHandleInheritance(listenSocket);
listenSocket.ReceiveBufferSize = _udpConfiguration.ReceiveBufferSize;
//listenSocket.SendBufferSize = _udpConfiguration.SendBufferSize;
listenSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
listenSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.PacketInformation, true);
// Kestrel expects IPv6Any to bind to both IPv6 and IPv4
if (endPoint.Address == IPAddress.IPv6Any)
{
listenSocket.DualMode = true;
}
try
{
listenSocket.Bind(endPoint);
}
catch (SocketException e) when(e.SocketErrorCode == SocketError.AddressAlreadyInUse)
{
ThrowSocketAlreadyInUse(e);
}
// If requested port was "0", replace with assigned dynamic port.
if (endPoint.Port == 0)
{
endPoint = (IPEndPoint)listenSocket.LocalEndPoint;
}
var connection = new UdpConnection(listenSocket, _memoryPool, _schedulers[schedulerIndex], _udpConfiguration, _logger, _handlerMapper);
connections.Add(connection);
// REVIEW: This task should be tracked by the server for graceful shutdown
// Today it's handled specifically for http but not for arbitrary middleware
_ = StartListeningAsync(connection);
}
catch (SocketException ex) when(!_unbinding)
{
_logger.LogError(ex);
throw;
}
}
_logger.LogInformation($"Started listening to {endPoint.ToString()} with {_numSchedulers.ToString()} listeners.", null);
_connections = connections;
return(Task.CompletedTask);
}