Service fabric communication by RPC with metadata

Question

In the API Gateway app I set to request traceId. Then over HTTP pass it to my stateless service. But service should call another service by RPC (using IServiceRemotingListener). How can I pass that traceId to other service?

I've done so far (according to this):

public interface ICommunicationService : IService
{
    Task<string> FooAsync();
}

public class Stateless1 : StatelessService, ICommunicationService 
{
    protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners() 
    {
        return new[] { new ServiceInstanceListener(c => this.CreateServiceRemotingListener(c)) };
    }       

    public Task<string> FooAsync()
    {
        return Task.FromResult("TraceId: " + TraceId);
    }
}

and trying to use it:

ICommunicationService service = ServiceProxy.Create<ICommunicationService>(new Uri("fabric:/App/Stateless1"));

string message = await service.FooAsync();

How can I pass that TraceId to other service b RPC?

Answer 1

You can only use methods in SF remoting. Change the property into a method GetCorrelationId that returns it as Task of int. And add a method:

Task SetCorrelationId( int id){} 

Or preferably, generate it on the caller and pass it as part of the message argument to 'FooAsync' which is better, because it keeps the service stateless.