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#pragma once
#include <grpc++/impl/codegen/byte_buffer.h>
#include <grpc++/impl/codegen/proto_utils.h>
#include <variant>
namespace NGrpc {
/**
* Universal response that owns underlying message or buffer.
*/
template <typename TMsg>
class TUniversalResponse: public TAtomicRefCount<TUniversalResponse<TMsg>>, public TMoveOnly {
friend class grpc::SerializationTraits<TUniversalResponse<TMsg>>;
public:
explicit TUniversalResponse(NProtoBuf::Message* msg) noexcept
: Data_{TMsg{}}
{
std::get<TMsg>(Data_).Swap(static_cast<TMsg*>(msg));
}
explicit TUniversalResponse(grpc::ByteBuffer* buffer) noexcept
: Data_{grpc::ByteBuffer{}}
{
std::get<grpc::ByteBuffer>(Data_).Swap(buffer);
}
private:
std::variant<TMsg, grpc::ByteBuffer> Data_;
};
/**
* Universal response that only keeps reference to underlying message or buffer.
*/
template <typename TMsg>
class TUniversalResponseRef: private TMoveOnly {
friend class grpc::SerializationTraits<TUniversalResponseRef<TMsg>>;
public:
explicit TUniversalResponseRef(const NProtoBuf::Message* msg)
: Data_{msg}
{
}
explicit TUniversalResponseRef(const grpc::ByteBuffer* buffer)
: Data_{buffer}
{
}
private:
std::variant<const NProtoBuf::Message*, const grpc::ByteBuffer*> Data_;
};
} // namespace NGrpc
namespace grpc {
template <typename TMsg>
class SerializationTraits<NGrpc::TUniversalResponse<TMsg>> {
public:
static Status Serialize(
const NGrpc::TUniversalResponse<TMsg>& resp,
ByteBuffer* buffer,
bool* ownBuffer)
{
return std::visit([&](const auto& data) {
using T = std::decay_t<decltype(data)>;
return SerializationTraits<T>::Serialize(data, buffer, ownBuffer);
}, resp.Data_);
}
};
template <typename TMsg>
class SerializationTraits<NGrpc::TUniversalResponseRef<TMsg>> {
public:
static Status Serialize(
const NGrpc::TUniversalResponseRef<TMsg>& resp,
ByteBuffer* buffer,
bool* ownBuffer)
{
return std::visit([&](const auto* data) {
using T = std::decay_t<std::remove_pointer_t<decltype(data)>>;
return SerializationTraits<T>::Serialize(*data, buffer, ownBuffer);
}, resp.Data_);
}
};
} // namespace grpc
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