Micronaut API and Client with Controller consuming Protobuf

Question

I have a Micronaut @Controller as follows:

@Post("/whatever")
@Consumes("application/x-protobuf")
@Produces(MediaType.TEXT_PLAIN)
public HttpResponse deserializeData (@Body byte[] body)
        throws ProtobufParsingException {

    return requestHandler.processDataRequest(body);
}

and a Client that calls this API:

@Client("${protobuf-manager.url}")
public interface ProtobufManagerClient {

@Post("/${protobuf-manager.apiversion}/whatever")
@Consumes(MediaType.TEXT_PLAIN)
@Produces(ProtobufferCodec.PROTOBUFFER_ENCODED)
   String getData (@Body byte[] data);
}

The problem is, I need to send my bytes from my byte[] data param not changing the @Consumes("application/x-protobuf") in my Controller.

body is arriving as empty in the Controller.

Any idea?

Answer 1

The issue is that the current Protobuf codec only supports encoding Message types. See https://github.com/micronaut-projects/micronaut-grpc/blob/a00a348028628c170d74bd7267011255c9ac01cd/protobuff-support/src/main/java/io/micronaut/protobuf/codec/ProtobufferCodec.java#L157

It seems to me it should support raw byte[] as well. Please file an issue with https://github.com/micronaut-projects/micronaut-grpc and PRs are appreciated