Add Protobuf messages into gRPC errors.
I had encountred a number of times for the need to give a structured message through gRPC errors The default Go err or status.Errorf functions are simple strings by default. func (s *Server) LintFile(ctx context.Context, req *LintRequest) (*LintResponse, error) { lintRes, err := lint(ctx, req.GetFile()) if err != nil { // lintRes is a protbuf message containing detailed error // for each line in the given file. return nil, status.New(codes.FailedPrecondition, "File isn't valid").WithDetails(lintRes) } return &LintResponse{}, nil } The example above illustrates a situation where you need to know what exactly was wrong with the file, The line number of where the error happened, what’s the reason etc. ...