private async Task DoSendAsync()
{
Exception error = null;
DebugLog("starting send loop");
try
{
while (true)
{
DebugLog("awaiting data from pipe...");
if (_sendToSocket.Reader.TryRead(out var result))
{
CounterHelper.Incr(Counter.SocketPipeReadReadSync);
}
else
{
CounterHelper.Incr(Counter.OpenSendReadAsync);
var read = _sendToSocket.Reader.ReadAsync();
CounterHelper.Incr(read.IsCompleted ? Counter.SocketPipeReadReadSync : Counter.SocketPipeReadReadAsync);
result = await read;
CounterHelper.Decr(Counter.OpenSendReadAsync);
}
var buffer = result.Buffer;
if (result.IsCanceled || (result.IsCompleted && buffer.IsEmpty))
{
DebugLog(result.IsCanceled ? "cancelled" : "complete");
break;
}
try
{
if (!buffer.IsEmpty)
{
// 说明：send方向上是read from pipe and send to socket，所以这里回调应该是
// 执行在ReaderScheduler上
if (_writerArgs == null)
{
_writerArgs = new SocketAwaitableEventArgs(InlineWrites ? null : _sendOptions.ReaderScheduler);
}
DebugLog($"sending {buffer.Length} bytes over socket...");
CounterHelper.Incr(Counter.OpenSendWriteAsync);
DoSend(Socket, _writerArgs, buffer, Name);
CounterHelper.Incr(_writerArgs.IsCompleted ? Counter.SocketSendAsyncSync : Counter.SocketSendAsyncAsync);
DebugLog(_writerArgs.IsCompleted ? "send is sync" : "send is async");
var bytesSend = await _writerArgs;
Interlocked.Add(ref _totalBytesSent, bytesSend);
CounterHelper.Decr(Counter.OpenSendWriteAsync);
}
else if (result.IsCompleted)
{
DebugLog("completed");
break;
}
}
finally
{
DebugLog("advancing");
_sendToSocket.Reader.AdvanceTo(buffer.End);
}
}
TrySetShutdown(PipeShutdownKind.WriteEndOfStream);
}
catch (SocketException ex) when(IsConnectionResetError(ex.SocketErrorCode))
{
TrySetShutdown(PipeShutdownKind.WriteSocketError, ex.SocketErrorCode);
DebugLog($"fail: {ex.SocketErrorCode}");
error = new ConnectionResetException(ex.Message, ex);
}
catch (SocketException ex) when(IsConnectionAbortError(ex.SocketErrorCode))
{
TrySetShutdown(PipeShutdownKind.WriteSocketError, ex.SocketErrorCode);
DebugLog($"fail: {ex.SocketErrorCode}");
// This should always be ignored since Shutdown() must have already been called by Abort().
error = ex;
}
catch (ObjectDisposedException ex)
{
TrySetShutdown(PipeShutdownKind.WriteDisposed);
DebugLog("fail: disposed");
error = ex;
}
catch (IOException ex)
{
TrySetShutdown(PipeShutdownKind.WriteIOException);
DebugLog($"fail - io: {ex.Message}");
error = ex;
}
catch (Exception ex)
{
TrySetShutdown(PipeShutdownKind.WriteException);
DebugLog($"fail: {ex.Message}");
error = ex;
}
finally
{
Shutdown(error);
error = error ?? _shutdownReason;
// close *both halves* of the send pipe; we're not
// listening *and* we don't want anyone trying to write
DebugLog($"marking {nameof(Output)} as complete");
try { _sendToSocket.Writer.Complete(error); } catch { }
try { _sendToSocket.Reader.Complete(error); } catch { }
TrySetShutdown(error, PipeShutdownKind.OutputReaderCompleted);
var args = _writerArgs;
_writerArgs = null;
if (args != null)
{
try { args.Dispose(); } catch { }
}
}
DebugLog(error == null ? "exiting with success" : $"exiting with failure: {error.Message}");
}