74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
|
// Copyright (c) Facebook, Inc. and its affiliates.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
#include <folly/io/IOBufQueue.h>
|
||
|
|
#include "rsocket/framing/ProtocolVersion.h"
|
||
|
|
#include "rsocket/internal/Common.h"
|
||
|
|
|
||
|
|
namespace rsocket {
|
||
|
|
|
||
|
|
///
|
||
|
|
/// Frames class is used to parse individual rsocket frames from the stream of
|
||
|
|
/// incoming payload chunks. Every time a frame is parsed the onFrame method is
|
||
|
|
/// invoked.
|
||
|
|
/// Each rsocket frame is prepended with the frame length by
|
||
|
|
/// prependSize method.
|
||
|
|
///
|
||
|
|
class Framer {
|
||
|
|
public:
|
||
|
|
Framer(ProtocolVersion protocolVersion, bool stripFrameLengthField)
|
||
|
|
: protocolVersion_{protocolVersion},
|
||
|
|
stripFrameLengthField_{stripFrameLengthField} {}
|
||
|
|
virtual ~Framer() {}
|
||
|
|
|
||
|
|
/// For processing incoming frame chunks
|
||
|
|
void addFrameChunk(std::unique_ptr<folly::IOBuf>);
|
||
|
|
|
||
|
|
/// Prepends payload size to the beginning of he IOBuf based on the
|
||
|
|
/// set protocol version
|
||
|
|
std::unique_ptr<folly::IOBuf> prependSize(
|
||
|
|
std::unique_ptr<folly::IOBuf> payload);
|
||
|
|
|
||
|
|
/// derived class can override this method to react to termination
|
||
|
|
virtual void error(const char*) = 0;
|
||
|
|
virtual void onFrame(std::unique_ptr<folly::IOBuf>) = 0;
|
||
|
|
|
||
|
|
ProtocolVersion protocolVersion() const {
|
||
|
|
return protocolVersion_;
|
||
|
|
}
|
||
|
|
|
||
|
|
StreamId peekStreamId(const folly::IOBuf& frame, bool) const;
|
||
|
|
|
||
|
|
std::unique_ptr<folly::IOBuf> drainPayloadQueue();
|
||
|
|
|
||
|
|
private:
|
||
|
|
// to explicitly trigger parsing frames
|
||
|
|
void parseFrames();
|
||
|
|
bool ensureOrAutodetectProtocolVersion();
|
||
|
|
|
||
|
|
size_t readFrameLength() const;
|
||
|
|
size_t frameSizeFieldLength() const;
|
||
|
|
size_t minimalFrameLength() const;
|
||
|
|
size_t frameSizeWithLengthField(size_t frameSize) const;
|
||
|
|
size_t frameSizeWithoutLengthField(size_t frameSize) const;
|
||
|
|
|
||
|
|
folly::IOBufQueue payloadQueue_{folly::IOBufQueue::cacheChainLength()};
|
||
|
|
ProtocolVersion protocolVersion_;
|
||
|
|
const bool stripFrameLengthField_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace rsocket
|