grpc service does not implement reflection.GRPCServer-CodePudding

I am creating a grpc service in go, I set up my grpc as follows

func setupGrpc() {
    lis, err := net.Listen("tcp", ":9000")
    if err != nil {
        log.Fatalf("failed to listen: %v", err)
    }

    s := followerservice.UserServer{}

    grpcServer := grpc.NewServer()
    gen.RegisterUserServiceServer(grpcServer, &s)

    // for ease of cli dev
    reflection.Register(s) // this doesn't work!

    if err := grpcServer.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %s", err)
    }
}

My UserServer looks like this

type UserServer struct {
    gen.UnimplementedUserServiceServer
}

func (s *UserServer) Create(ctx context.Context, in *gen.CreateUserRequest)(*gen.CreateUserResponse, error) {
    log.Printf("Receive message body from client: %s", in.Email)
    return &gen.CreateUserResponse{Id: "new id!"}, nil
}

At the line marked in func setupGrpc() I get a compile time error:

followerservice.UserServer does not implement reflection.GRPCServer (missing GetServiceInfo method)

but I can't find out how to implement it, I've been googling for hours now. It feels like protoc could generate this for me, but I'm kinda confused.

CodePudding user response：

You have to reflection.Register the *grpc.Server that you got from the grpc.NewServer() constructor, not your own implementation.

    grpcServer := grpc.NewServer()
    gen.RegisterUserServiceServer(grpcServer, &s)

    reflection.Register(grpcServer)