ToFixedLenFrameSubject(this Socket socket, ISimpleFrameEncoder encoder, IFixedLenFrameDecoder decoder,
SyncBufManager bufferManager, CancellationToken token)
{
return(Subject.Create <DisposableValue <ArraySegment <byte> >, DisposableValue <ArraySegment <byte> > >(
socket.ToFrameClientObserver(encoder, token, bufferManager),
socket.ToFixedLenFrameObservable(bufferManager, decoder)));
}
public static IObservable <DisposableValue <ArraySegment <byte> > > ToFixedLenFrameObservable(this Socket socket,
SyncBufManager bufferManager, IFixedLenFrameDecoder decoder)
{
return(Observable.Create <DisposableValue <ArraySegment <byte> > >(async(observer, token) =>
{
var receivedFlag = decoder.ReceivedFlags;
var decoderLenByteCount = decoder.LenByteCount;
var hc = 1 + decoderLenByteCount;
var decoderHeader = decoder.Header;
var decoderTail = decoder.Tail;
var headerBuffer = new byte[hc];
try
{
while (!token.IsCancellationRequested)
{
if (await socket.ReceiveCompletelyAsync(headerBuffer, hc, receivedFlag, token) != hc)
{
break;
}
if (headerBuffer[0] != decoderHeader)
{
AppLogger.Warning($"corruted packet: invalid frame header");
break;
}
var length = LengthBitConverter.FromByte(headerBuffer, 1, decoderLenByteCount) - 1;
var buffer = bufferManager.TakeBuffer(length);
if (await socket.ReceiveCompletelyAsync(buffer, length, receivedFlag, token) != length)
{
break;
}
var arraySegment = new ArraySegment <byte>(buffer, 0, length);
observer.OnNext(
new DisposableValue <ArraySegment <byte> >(arraySegment,
Disposable.Create(() => bufferManager.ReturnBuffer(buffer))));
if (await socket.ReceiveAsync(headerBuffer, 0, 1, receivedFlag) == 0)
{
break;
}
if (headerBuffer[0] != decoderTail)
{
AppLogger.Warning($"corruted packet: invalid frame tail," + headerBuffer[0].Show());
break;
}
}
observer.OnCompleted();
}
catch (Exception error)
{
observer.OnError(error);
}
}));
}
