private void ConnectionCallback(UvStreamHandle listenSocket, int status, UvException error, object state)
{
var listener = (UvListener)state;
if (error != null)
{
listener.Log.LogError(0, error, "Listener.ConnectionCallback");
}
else if (!listener._closed)
{
UvStreamHandle acceptSocket = null;
try
{
acceptSocket = CreateAcceptSocket();
listenSocket.Accept(acceptSocket);
DispatchConnection(acceptSocket);
}
catch (UvException ex) when(UvConstants.IsConnectionReset(ex.StatusCode))
{
Log.ConnectionReset("(null)");
acceptSocket?.Dispose();
}
catch (UvException ex)
{
Log.LogError(0, ex, "Listener.OnConnection");
acceptSocket?.Dispose();
}
}
}
protected async Task HandleConnectionAsync(UvStreamHandle socket)
{
try
{
IPEndPoint remoteEndPoint = null;
IPEndPoint localEndPoint = null;
if (socket is UvTcpHandle tcpHandle)
{
try
{
remoteEndPoint = tcpHandle.GetPeerIPEndPoint();
localEndPoint = tcpHandle.GetSockIPEndPoint();
}
catch (UvException ex) when(UvConstants.IsConnectionReset(ex.StatusCode))
{
Log.ConnectionReset("(null)");
socket.Dispose();
return;
}
}
var connection = new UvConnection(socket, _thread, remoteEndPoint, localEndPoint, log: Log);
await connection.Start();
await Dispatcher.OnConnection(connection);
connection.Dispose();
}
catch (Exception ex)
{
Log.LogCritical(ex, $"Unexpected exception in {nameof(UvListener)}.{nameof(HandleConnectionAsync)}.");
}
}
public async Task Start()
{
try
{
StartReading();
Exception inputError = null;
Exception outputError = null;
try
{
// This *must* happen after socket.ReadStart
// The socket output consumer is the only thing that can close the connection. If the
// output pipe is already closed by the time we start then it's fine since, it'll
// close gracefully afterwards.
await WriteOutputAsync();
}
catch (UvException ex)
{
// The connection reset/error has already been logged by LibuvOutputConsumer
if (ex.StatusCode == UvConstants.ECANCELED)
{
// Connection was aborted.
}
else if (UvConstants.IsConnectionReset(ex.StatusCode))
{
// Don't cause writes to throw for connection resets.
outputError = new ConnectionResetException(ex.Message, ex);
}
else
{
inputError = ex;
outputError = ex;
}
}
finally
{
// Now, complete the input so that no more reads can happen
_receiveFromUV.Writer.Complete(inputError ?? _abortReason ?? new ConnectionAbortedException());
_sendToUV.Reader.Complete(outputError);
// Make sure it isn't possible for a paused read to resume reading after calling uv_close
// on the stream handle
_receiveFromUV.Writer.CancelPendingFlush();
// Send a FIN
Log.ConnectionWriteFin(ConnectionId);
// We're done with the socket now
_socket.Dispose();
ThreadPool.QueueUserWorkItem(state => ((UvConnection)state).CancelConnectionClosedToken(), this);
}
}
catch (Exception e)
{
Log.LogCritical(0, e, $"{nameof(UvConnection)}.{nameof(Start)}() {ConnectionId}");
}
}
public void ReadCallback(UvStreamHandle dispatchPipe, int status)
{
try
{
dispatchPipe.Libuv.ThrowIfErrored(status);
_bytesRead += status;
if (_bytesRead == _bufferLength)
{
var correctMessage = true;
for (var i = 0; i < _bufferLength; i++)
{
if (_buf[i] != _listener._pipeMessage[i])
{
correctMessage = false;
}
}
if (correctMessage)
{
_listener._dispatchPipes.Add((UvPipeHandle)dispatchPipe);
dispatchPipe.ReadStop();
_bufHandle.Free();
}
else
{
throw new IOException("Bad data sent over Kestrel pipe.");
}
}
}
catch (Exception ex)
{
dispatchPipe.Dispose();
_bufHandle.Free();
_listener.Log.LogError(0, ex, "ListenerPrimary.ReadCallback");
}
}