Raising a server error to the client with grpc

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Yes, there is a better way. You may change the status details using the ServicerContext.set_details method and you may change the status code using the ServicerContext.set_code method. I suspect that your servicer will look something like

class MyService(proto_pb2.SomethingServicer):

    def Do(self, request, context):
        if not is_valid_field(request.field):
            context.set_code(grpc.StatusCode.INVALID_ARGUMENT)
            context.set_details('Consarnit!')
            return proto_pb2.Response()
        return proto_pb2.Response(response="Yeah!")

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