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// Copyright 2022 gRPC authors.
//
// 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.
#ifndef GRPC_SRC_CORE_EXT_TRANSPORT_CHAOTIC_GOOD_FRAME_H
#define GRPC_SRC_CORE_EXT_TRANSPORT_CHAOTIC_GOOD_FRAME_H
#include <grpc/support/port_platform.h>
#include <cstdint>
#include <memory>
#include <string>
#include "absl/random/bit_gen_ref.h"
#include "absl/status/status.h"
#include "absl/types/variant.h"
#include "src/core/ext/transport/chaotic_good/frame_header.h"
#include "src/core/ext/transport/chttp2/transport/hpack_encoder.h"
#include "src/core/ext/transport/chttp2/transport/hpack_parser.h"
#include "src/core/lib/gprpp/match.h"
#include "src/core/lib/resource_quota/arena.h"
#include "src/core/lib/slice/slice_buffer.h"
#include "src/core/lib/transport/metadata_batch.h"
#include "src/core/lib/transport/transport.h"
namespace grpc_core {
namespace chaotic_good {
struct BufferPair {
SliceBuffer control;
SliceBuffer data;
};
struct FrameLimits {
size_t max_message_size = 1024 * 1024 * 1024;
size_t max_padding = 63;
absl::Status ValidateMessage(const FrameHeader& header);
};
class FrameInterface {
public:
virtual absl::Status Deserialize(HPackParser* parser,
const FrameHeader& header,
absl::BitGenRef bitsrc, Arena* arena,
BufferPair buffers, FrameLimits limits) = 0;
virtual BufferPair Serialize(HPackCompressor* encoder) const = 0;
virtual std::string ToString() const = 0;
protected:
static bool EqVal(const grpc_metadata_batch& a,
const grpc_metadata_batch& b) {
return a.DebugString() == b.DebugString();
}
template <typename T>
static bool EqHdl(const Arena::PoolPtr<T>& a, const Arena::PoolPtr<T>& b) {
if (a == nullptr && b == nullptr) return true;
if (a == nullptr || b == nullptr) return false;
return EqVal(*a, *b);
}
~FrameInterface() = default;
};
struct SettingsFrame final : public FrameInterface {
absl::Status Deserialize(HPackParser* parser, const FrameHeader& header,
absl::BitGenRef bitsrc, Arena* arena,
BufferPair buffers, FrameLimits limits) override;
BufferPair Serialize(HPackCompressor* encoder) const override;
std::string ToString() const override;
bool operator==(const SettingsFrame&) const { return true; }
};
struct FragmentMessage {
FragmentMessage(MessageHandle message, uint32_t padding, uint32_t length)
: message(std::move(message)), padding(padding), length(length) {}
MessageHandle message;
uint32_t padding;
uint32_t length;
std::string ToString() const;
static bool EqVal(const Message& a, const Message& b) {
return a.payload()->JoinIntoString() == b.payload()->JoinIntoString() &&
a.flags() == b.flags();
}
bool operator==(const FragmentMessage& other) const {
if (length != other.length) return false;
if (message == nullptr && other.message == nullptr) return true;
if (message == nullptr || other.message == nullptr) return false;
return EqVal(*message, *other.message);
}
};
struct ClientFragmentFrame final : public FrameInterface {
absl::Status Deserialize(HPackParser* parser, const FrameHeader& header,
absl::BitGenRef bitsrc, Arena* arena,
BufferPair buffers, FrameLimits limits) override;
BufferPair Serialize(HPackCompressor* encoder) const override;
std::string ToString() const override;
uint32_t stream_id;
ClientMetadataHandle headers;
absl::optional<FragmentMessage> message;
bool end_of_stream = false;
bool operator==(const ClientFragmentFrame& other) const {
return stream_id == other.stream_id && EqHdl(headers, other.headers) &&
message == other.message && end_of_stream == other.end_of_stream;
}
};
struct ServerFragmentFrame final : public FrameInterface {
absl::Status Deserialize(HPackParser* parser, const FrameHeader& header,
absl::BitGenRef bitsrc, Arena* arena,
BufferPair buffers, FrameLimits limits) override;
BufferPair Serialize(HPackCompressor* encoder) const override;
std::string ToString() const override;
uint32_t stream_id;
ServerMetadataHandle headers;
absl::optional<FragmentMessage> message;
ServerMetadataHandle trailers;
bool operator==(const ServerFragmentFrame& other) const {
return stream_id == other.stream_id && EqHdl(headers, other.headers) &&
message == other.message && EqHdl(trailers, other.trailers);
}
};
struct CancelFrame final : public FrameInterface {
absl::Status Deserialize(HPackParser* parser, const FrameHeader& header,
absl::BitGenRef bitsrc, Arena* arena,
BufferPair buffers, FrameLimits limits) override;
BufferPair Serialize(HPackCompressor* encoder) const override;
std::string ToString() const override;
uint32_t stream_id;
bool operator==(const CancelFrame& other) const {
return stream_id == other.stream_id;
}
};
using ClientFrame = absl::variant<ClientFragmentFrame, CancelFrame>;
using ServerFrame = absl::variant<ServerFragmentFrame>;
inline FrameInterface& GetFrameInterface(ClientFrame& frame) {
return MatchMutable(
&frame,
[](ClientFragmentFrame* frame) -> FrameInterface& { return *frame; },
[](CancelFrame* frame) -> FrameInterface& { return *frame; });
}
inline FrameInterface& GetFrameInterface(ServerFrame& frame) {
return MatchMutable(
&frame,
[](ServerFragmentFrame* frame) -> FrameInterface& { return *frame; });
}
} // namespace chaotic_good
} // namespace grpc_core
#endif // GRPC_SRC_CORE_EXT_TRANSPORT_CHAOTIC_GOOD_FRAME_H
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