ruby - 如何从 gRPC 服务返回错误？

Question

我有一个在 Ruby 中运行的简单 gRPC 服务。在某些情况下，我想以受控方式向客户端返回错误，例如带有错误消息的 HTTP 状态代码。我没有从文档中看到任何明确的方法来做到这一点；正确的做法是什么？

Answer 1

经过一段时间的研究，我认为正确的答案是使用 GRPC::BadStatus，如 here 所述。 :

BadStatus is an exception class that indicates that an error occurred at either end of a GRPC connection. When raised, it indicates that a status error should be returned to the other end of a GRPC connection; when caught it means that this end received a status error.

There is also subclass of BadStatus in this module for each GRPC status. E.g., the GRPC::Cancelled class corresponds to status CANCELLED.

See https://github.com/grpc/grpc/blob/master/include/grpc/impl/codegen/status.h for detailed descriptions of each status code.

因此，引发这样的错误

raise GRPC::BadStatus.new_status_exception(CANCELLED)

应该可以解决问题。