private async Task ProcessSends()
{
// Resolve `output` PipeReader via the IDuplexPipe interface prior to loop start for performance.
var output = Output;
while (true)
{
var result = await output.ReadAsync();
if (result.IsCanceled)
{
break;
}
var buffer = result.Buffer;
var end = buffer.End;
var isCompleted = result.IsCompleted;
if (!buffer.IsEmpty)
{
_sender = _socketSenderPool.Rent();
await _sender.SendAsync(_socket, buffer);
// We don't return to the pool if there was an exception, and
// we keep the _sender assigned so that we can dispose it in StartAsync.
_socketSenderPool.Return(_sender);
_sender = null;
}
output.AdvanceTo(end);
if (isCompleted)
{
break;
}
}
}
private async Task DoSend()
{
Exception?shutdownReason = null;
Exception?unexpectedError = null;
try
{
while (true)
{
var result = await Output.ReadAsync();
if (result.IsCanceled)
{
break;
}
var buffer = result.Buffer;
if (!buffer.IsEmpty)
{
_sender = _socketSenderPool.Rent();
await _sender.SendAsync(_socket, buffer);
// We don't return to the pool if there was an exception, and
// we keep the _sender assigned so that we can dispose it in StartAsync.
_socketSenderPool.Return(_sender);
_sender = null;
}
Output.AdvanceTo(buffer.End);
if (result.IsCompleted)
{
break;
}
}
}
catch (SocketException ex) when(IsConnectionResetError(ex.SocketErrorCode))
{
shutdownReason = new ConnectionResetException(ex.Message, ex);
_trace.ConnectionReset(this);
}
catch (Exception ex)
when((ex is SocketException socketEx && IsConnectionAbortError(socketEx.SocketErrorCode)) ||
ex is ObjectDisposedException)
{
// This should always be ignored since Shutdown() must have already been called by Abort().
shutdownReason = ex;
}
catch (Exception ex)
{
shutdownReason = ex;
unexpectedError = ex;
_trace.ConnectionError(this, unexpectedError);
}
finally
{
Shutdown(shutdownReason);
// Complete the output after disposing the socket
Output.Complete(unexpectedError);
// Cancel any pending flushes so that the input loop is un-paused
Input.CancelPendingFlush();
}
}