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// Copyright 2020 The Dawn 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 SRC_DAWN_WIRE_CHUNKEDCOMMANDSERIALIZER_H_
#define SRC_DAWN_WIRE_CHUNKEDCOMMANDSERIALIZER_H_
#include <algorithm>
#include <cstring>
#include <functional>
#include <memory>
#include <utility>
#include "dawn/common/Alloc.h"
#include "dawn/common/Compiler.h"
#include "dawn/common/Constants.h"
#include "dawn/common/Math.h"
#include "dawn/wire/Wire.h"
#include "dawn/wire/WireCmd_autogen.h"
namespace dawn::wire {
// Simple command extension struct used when a command needs to serialize additional information
// that is not baked directly into the command already.
struct CommandExtension {
size_t size;
std::function<void(char*)> serialize;
};
namespace detail {
inline WireResult SerializeCommandExtension(SerializeBuffer* serializeBuffer) {
return WireResult::Success;
}
template <typename Extension, typename... Extensions>
WireResult SerializeCommandExtension(SerializeBuffer* serializeBuffer,
Extension&& e,
Extensions&&... es) {
char* buffer;
WIRE_TRY(serializeBuffer->NextN(e.size, &buffer));
e.serialize(buffer);
WIRE_TRY(SerializeCommandExtension(serializeBuffer, std::forward<Extensions>(es)...));
return WireResult::Success;
}
} // namespace detail
class ChunkedCommandSerializer {
public:
explicit ChunkedCommandSerializer(CommandSerializer* serializer);
template <typename Cmd>
void SerializeCommand(const Cmd& cmd) {
SerializeCommandImpl(
cmd, [](const Cmd& cmd, size_t requiredSize, SerializeBuffer* serializeBuffer) {
return cmd.Serialize(requiredSize, serializeBuffer);
});
}
template <typename Cmd, typename... Extensions>
void SerializeCommand(const Cmd& cmd, CommandExtension&& e, Extensions&&... es) {
SerializeCommandImpl(
cmd,
[](const Cmd& cmd, size_t requiredSize, SerializeBuffer* serializeBuffer) {
return cmd.Serialize(requiredSize, serializeBuffer);
},
std::forward<CommandExtension>(e), std::forward<Extensions>(es)...);
}
template <typename Cmd, typename... Extensions>
void SerializeCommand(const Cmd& cmd,
const ObjectIdProvider& objectIdProvider,
Extensions&&... extensions) {
SerializeCommandImpl(
cmd,
[&objectIdProvider](const Cmd& cmd, size_t requiredSize,
SerializeBuffer* serializeBuffer) {
return cmd.Serialize(requiredSize, serializeBuffer, objectIdProvider);
},
std::forward<Extensions>(extensions)...);
}
private:
template <typename Cmd, typename SerializeCmdFn, typename... Extensions>
void SerializeCommandImpl(const Cmd& cmd,
SerializeCmdFn&& SerializeCmd,
Extensions&&... extensions) {
size_t commandSize = cmd.GetRequiredSize();
size_t requiredSize = (Align(extensions.size, kWireBufferAlignment) + ... + commandSize);
if (requiredSize <= mMaxAllocationSize) {
char* allocatedBuffer = static_cast<char*>(mSerializer->GetCmdSpace(requiredSize));
if (allocatedBuffer != nullptr) {
SerializeBuffer serializeBuffer(allocatedBuffer, requiredSize);
WireResult rCmd = SerializeCmd(cmd, requiredSize, &serializeBuffer);
WireResult rExts =
detail::SerializeCommandExtension(&serializeBuffer, extensions...);
if (DAWN_UNLIKELY(rCmd != WireResult::Success || rExts != WireResult::Success)) {
mSerializer->OnSerializeError();
}
}
return;
}
auto cmdSpace = std::unique_ptr<char[]>(AllocNoThrow<char>(requiredSize));
if (!cmdSpace) {
return;
}
SerializeBuffer serializeBuffer(cmdSpace.get(), requiredSize);
WireResult rCmd = SerializeCmd(cmd, requiredSize, &serializeBuffer);
WireResult rExts = detail::SerializeCommandExtension(&serializeBuffer, extensions...);
if (DAWN_UNLIKELY(rCmd != WireResult::Success || rExts != WireResult::Success)) {
mSerializer->OnSerializeError();
return;
}
SerializeChunkedCommand(cmdSpace.get(), requiredSize);
}
void SerializeChunkedCommand(const char* allocatedBuffer, size_t remainingSize);
CommandSerializer* mSerializer;
size_t mMaxAllocationSize;
};
} // namespace dawn::wire
#endif // SRC_DAWN_WIRE_CHUNKEDCOMMANDSERIALIZER_H_