private async Task ProcessHeadersFrame(FrameHeader frameHeader)
{
Debug.Assert(frameHeader.Type == FrameType.Headers);
bool endStream = frameHeader.EndStreamFlag;
int streamId = frameHeader.StreamId;
Http2Stream http2Stream = GetStream(streamId);
if (http2Stream == null)
{
_incomingBuffer.Discard(frameHeader.Length);
// Don't wait for completion, which could happen asynchronously.
ValueTask ignored = SendRstStreamAsync(streamId, Http2ProtocolErrorCode.StreamClosed);
return;
}
// TODO: Figure out how to cache this delegate.
// Probably want to pass a state object to Decode.
HPackDecoder.HeaderCallback headerCallback = http2Stream.OnResponseHeader;
_hpackDecoder.Decode(GetFrameData(_incomingBuffer.ActiveSpan.Slice(0, frameHeader.Length), frameHeader.PaddedFlag, frameHeader.PriorityFlag), headerCallback);
_incomingBuffer.Discard(frameHeader.Length);
while (!frameHeader.EndHeadersFlag)
{
frameHeader = await ReadFrameAsync().ConfigureAwait(false);
if (frameHeader.Type != FrameType.Continuation ||
frameHeader.StreamId != streamId)
{
throw new Http2ProtocolException(Http2ProtocolErrorCode.ProtocolError);
}
_hpackDecoder.Decode(_incomingBuffer.ActiveSpan.Slice(0, frameHeader.Length), headerCallback);
_incomingBuffer.Discard(frameHeader.Length);
}
_hpackDecoder.CompleteDecode();
http2Stream.OnResponseHeadersComplete(endStream);
if (endStream)
{
RemoveStream(http2Stream);
}
}
