Is there any way to use rich error model for grpc service in armeria?

Question

I am using Armeria 1.3.0 and protobuf for a gRPC service. I've tried to use rich error model when handling exceptions but I think Armeria seems to only support standard error model.

How can I use rich error model in Armeria? I want to return custom error code/message and more details about error when exception occurred.

Thanks for your answer in advance.

Answer 1

It was not possible to attach arbitrary gRPC Metadata to a gRPC error response till Armeria 1.5.0, but you will be able to do so from the next minor update (1.6.0):

GrpcService
    .builder()
    .addExceptionMapping(MyException.class, (cause, metadata) -> {
        metadata.put(MY_KEY, myValue)
        return Status.XXX.withDescription("...");
    })
    ...

See https://github.com/line/armeria/pull/3329 for the detail.