void VerifyHeadersFrame()
{
VerifyAssociatedWithAStream();
VerifyNotProcessingHeaders();
VerifyPayloadLength(_payloadLength);
int requiredLength = _flags.GetPaddingPresenceFieldLength() + _flags.GetNumPriorityBytes();
if (_payloadLength < requiredLength)
{
ThrowHelper.ThrowStreamError_FrameLengthTooSmall(_streamId, _payloadLength);
}
}
Task WriteHeadersInternal(IChannelHandlerContext ctx, int streamId,
IHttp2Headers headers, int padding, bool endOfStream, bool hasPriority,
int streamDependency, short weight, bool exclusive, IPromise promise)
{
IByteBuffer headerBlock = null;
SimplePromiseAggregator promiseAggregator = new SimplePromiseAggregator(promise);
try
{
if ((uint)(streamId - 1) > SharedConstants.TooBigOrNegative)
{
ThrowHelper.ThrowArgumentException_Positive(ExceptionArgument.StreamID);
}
if (hasPriority)
{
if (streamDependency < 0)
{
ThrowHelper.ThrowArgumentException_PositiveOrZero(ExceptionArgument.StreamDependency);
}
Http2CodecUtil.VerifyPadding(padding);
VerifyWeight(weight);
}
// Encode the entire header block.
headerBlock = ctx.Allocator.Buffer();
_headersEncoder.EncodeHeaders(streamId, headers, headerBlock);
Http2Flags flags =
new Http2Flags().EndOfStream(endOfStream).PriorityPresent(hasPriority).PaddingPresent(padding > 0);
// Read the first fragment (possibly everything).
int nonFragmentBytes = padding + flags.GetNumPriorityBytes();
int maxFragmentLength = _maxFrameSize - nonFragmentBytes;
IByteBuffer fragment = headerBlock.ReadRetainedSlice(Math.Min(headerBlock.ReadableBytes, maxFragmentLength));
// Set the end of headers flag for the first frame.
_ = flags.EndOfHeaders(!headerBlock.IsReadable());
int payloadLength = fragment.ReadableBytes + nonFragmentBytes;
IByteBuffer buf = ctx.Allocator.Buffer(Http2CodecUtil.HeadersFrameHeaderLength);
Http2CodecUtil.WriteFrameHeaderInternal(buf, payloadLength, Http2FrameTypes.Headers, flags, streamId);
WritePaddingLength(buf, padding);
if (hasPriority)
{
_ = buf.WriteInt(exclusive ? (int)(uint)(0x80000000L | streamDependency) : streamDependency);
// Adjust the weight so that it fits into a single byte on the wire.
_ = buf.WriteByte(weight - 1);
}
_ = ctx.WriteAsync(buf, promiseAggregator.NewPromise());
// Write the first fragment.
_ = ctx.WriteAsync(fragment, promiseAggregator.NewPromise());
// Write out the padding, if any.
if (PaddingBytes(padding) > 0)
{
_ = ctx.WriteAsync(ZeroBuffer.Slice(0, PaddingBytes(padding)), promiseAggregator.NewPromise());
}
if (!flags.EndOfHeaders())
{
_ = WriteContinuationFramesAsync(ctx, streamId, headerBlock, promiseAggregator);
}
}
catch (Http2Exception e)
{
promiseAggregator.SetException(e);
}
catch (Exception t)
{
promiseAggregator.SetException(t);
_ = promiseAggregator.DoneAllocatingPromises();
throw;
}
finally
{
_ = (headerBlock?.Release());
}
_ = promiseAggregator.DoneAllocatingPromises();
return(promiseAggregator.Task);
}
