reference to MetaData object in grpc service method

[Mahesh Kanote]

Hi,

I have question about getting MetaData in grpc service method. By Implementing io.grpc.ServerInterceptor its possible to get reference of MetaData sent by client. But, is there any way we can get reference to MetaData object in grpc service method? Something like HttpServletRequest and HttpServletResponse in case of RestControllers.

Thanks,

Mahesh

[Carl Mastrangelo]

gRPC Java does not expose all the headers, because some of them are gRPC specific.  What headers did you want to access?

[Mahesh Kanote]

I wanted to access custom headers sent by client as meta data. I am able to do it using context object in server interceptor. 

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[Carl Mastrangelo]

Can you give a snippet of code showing what you are trying to do but can't?

[Mahesh Kanote]

I am able to do it now with below snippet. 

Interceptor:

public class ContextInterceptor implements ServerInterceptor {

  @Override

  public <ReqT, RespT> Listener<ReqT> interceptCall(

      ServerCall<ReqT, RespT> call,

      Metadata headers,

      ServerCallHandler<ReqT, RespT> next) {

    String id = headers.get(METADATA_KEY);

    Context ctx = Context.current().withValue(CONTEXT_KEY, id);

    return Contexts.interceptCall(ctx, call, headers, next);

  }

}

In gRpc service:

public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {

    HelloReply reply = HelloReply.newBuilder()

        .setMessage("name = " + request.getName() + ", id = " + Keys.CONTEXT_KEY.get())

        .build();

    responseObserver.onNext(reply);

    responseObserver.onCompleted();

  }

Thanks,

Mahesh

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Thanks,

Mahesh