proto_utils.h

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#ifndef GRPC_INTERNAL_CPP_PROTO_PROTO_UTILS_H
#define GRPC_INTERNAL_CPP_PROTO_PROTO_UTILS_H

#include <type_traits>

#include <grpc/grpc.h>
#include <grpc++/impl/serialization_traits.h>
#include <grpc++/config_protobuf.h>
#include <grpc++/status.h>

namespace grpc {

// Serialize the msg into a buffer created inside the function. The caller
// should destroy the returned buffer when done with it. If serialization fails,
// false is returned and buffer is left unchanged.
Status SerializeProto(const grpc::protobuf::Message& msg,
                      grpc_byte_buffer** buffer);

// The caller keeps ownership of buffer and msg.
Status DeserializeProto(grpc_byte_buffer* buffer, grpc::protobuf::Message* msg,
                        int max_message_size);

template <class T>
class SerializationTraits<T, typename std::enable_if<std::is_base_of<
                                 grpc::protobuf::Message, T>::value>::type> {
 public:
  static Status Serialize(const grpc::protobuf::Message& msg,
                          grpc_byte_buffer** buffer, bool* own_buffer) {
    *own_buffer = true;
    return SerializeProto(msg, buffer);
  }
  static Status Deserialize(grpc_byte_buffer* buffer,
                            grpc::protobuf::Message* msg,
                            int max_message_size) {
    auto status = DeserializeProto(buffer, msg, max_message_size);
    grpc_byte_buffer_destroy(buffer);
    return status;
  }
};

}  // namespace grpc

#endif  // GRPC_INTERNAL_CPP_PROTO_PROTO_UTILS_H