internal override async ValueTask <(long StreamId, IncomingFrame?Frame, bool Fin)> ReceiveAsync(
CancellationToken cancel)
{
FrameType type;
ArraySegment <byte> data;
while (true)
{
// Read Slic frame header
(type, data) = await ReceiveFrameAsync(CancellationToken.None).ConfigureAwait(false);
switch (type)
{
case FrameType.Ping:
{
ValueTask task = PrepareAndSendFrameAsync(FrameType.Pong, null, CancellationToken.None);
HeartbeatCallback !();
break;
}
case FrameType.Pong:
{
// TODO: setup a timer to expect pong frame response?
break;
}
case FrameType.Stream:
case FrameType.StreamLast:
{
(long streamId, int streamIdSize) = data.AsReadOnlySpan().ReadVarLong();
data = data.Slice(streamIdSize);
IncomingFrame frame = ParseIce2Frame(data);
if (Endpoint.Communicator.TraceLevels.Protocol >= 1)
{
ProtocolTrace.TraceFrame(Endpoint.Communicator, streamId, frame);
}
return(StreamId : streamId, Frame : frame, Fin : type == FrameType.StreamLast);
}
case FrameType.ResetStream:
{
var istr = new InputStream(data, Encoding);
long streamId = istr.ReadVarLong();
long reason = istr.ReadVarLong();
return(StreamId : streamId, Frame : null, Fin : true);
}
case FrameType.Close:
{
var istr = new InputStream(data, Encoding);
long code = istr.ReadVarLong(); // TODO: is this really useful?
string reason = istr.ReadString();
throw new ConnectionClosedByPeerException(reason);
}
default:
{
throw new InvalidDataException($"unexpected Slic frame with frame type `{type}'");
}
}
}
}
