private void Flush(BufferingContext bufferingCtx)
{
if (bufferingCtx.Segment.Count != 0)
{
SendBuffer(bufferingCtx.Segment);
}
bufferingCtx.Reset();
}
private async Task SendBuffers()
{
var bufferingCtx = new BufferingContext(_maxBufferingSize, _maxBufferingTime, _sendBuffersCancellation.Token);
while (true)
{
ArraySegment <byte> buffer;
if (_sendBuffersCancellation.IsCancellationRequested) // disposing
{
if (!_chan.Reader.TryRead(out buffer))
{
Flush(bufferingCtx);
return;
}
}
else
{
// the try block was not extract in its own method to avoid the cost of a new async state machine
try
{
bufferingCtx.EnableTimeout();
buffer = await _chan.Reader.ReadAsync(bufferingCtx.BufferingCancellation);
// make sure it doesn't get cancelled so it can be reused in the next iteration
bufferingCtx.DisableTimeout();
}
catch (OperationCanceledException) // timeout reached or disposing
{
if (!_sendBuffersCancellation.IsCancellationRequested) // timeout
{
Flush(bufferingCtx);
}
// continue in both case. If timeout, reloop to retry getting a value. If disposing reloop to dequeue all buffers
continue;
}
}
if (buffer.Count > _maxBufferingSize)
{
SendBuffer(buffer);
ArrayPool <byte> .Shared.Return(buffer.Array);
continue;
}
if (!bufferingCtx.Fits(buffer))
{
Flush(bufferingCtx);
}
bufferingCtx.Append(buffer);
ArrayPool <byte> .Shared.Return(buffer.Array);
}
}
private async Task <string> ReceiveLoopAsync(BufferingContext bufferingContext, CancellationToken cancellationToken, int loop)
{
using (bufferingContext)
{
var encoding = bufferingContext.Encoding;
var bufferBytes = bufferingContext.BufferBytes;
var bufferChars = bufferingContext.BufferChars;
var sb = bufferingContext.StringBuilder;
try
{
string response = null;
while ((loop == -1 || --loop >= 0) && !cancellationToken.IsCancellationRequested)
{
response = await ReceiveMessageAsync(cancellationToken, bufferBytes, bufferChars, encoding, sb);
sb = sb.Clear();
}
if (cancellationToken.IsCancellationRequested)
{
return(await TaskEx.FromCanceled <string>(cancellationToken));
}
return(response);
}
catch (AggregateException ex)
{
ErrorReceived?.Invoke(this, new SocketErrorEventArgs {
Exception = ex.Flatten()
});
}
catch (Exception ex)
{
ErrorReceived?.Invoke(this, new SocketErrorEventArgs {
Exception = ex
});
}
}
return(await Task.FromResult(string.Empty));
}
private Task <string> ReceiveLoopAsync(BufferingContext bufferingContext, CancellationToken cancellationToken, int loop)
{
string response = null;
return(TaskEx.AsyncLoopTask(() =>
{
cancellationToken.ThrowIfCancellationRequested();
if (loop == -1 || --loop >= 0)
{
return TaskEx.FromResult(Flow <string> .Return(response));
}
var encoding = bufferingContext.Encoding;
var bufferBytes = bufferingContext.BufferBytes;
var bufferChars = bufferingContext.BufferChars;
var sb = bufferingContext.StringBuilder;
return ReceiveMessageAsync(cancellationToken, bufferBytes, bufferChars, encoding, sb).ContinueWith(t =>
{
response = t.Result;
sb.Length = 0;
return Flow <string> .Continue();
}, cancellationToken);
}).ContinueWithTask(task =>
{
if (cancellationToken.IsCancellationRequested)
{
return TaskEx.FromCanceled <string>(cancellationToken);
}
return TaskEx.FromResult(task.Result);
}, cancellationToken)
.CatchWith <string, Exception>(ex => ErrorReceived?.Invoke(this, new SocketErrorEventArgs {
Exception = ex
}))
.UsingWith(bufferingContext));
}