Unique Name must be specified for each listener when multiple communication listeners are used

Question

I have created a .NET Core stateless Service Fabric application (v 3.0.467). I need to use both KestrelCommunicationListener and a ServiceProxy remote call for this service.

When I am deploying the application to the local cluster, it's throwing an exception:

Unique Name must be specified for each listener when multiple communication listeners are used

I have configured as below in the servicemanifest.xml file

<Resources>
    <Endpoints>
      <!-- This endpoint is used by the communication listener to obtain the port on which to 
           listen. Please note that if your service is partitioned, this port is shared with 
           replicas of different partitions that are placed in your code. -->
      <Endpoint Name="ServiceEndpointV2" />
      <Endpoint Protocol="http" Name="httpServiceEndpoint" Type="Input" Port="9098" />
    </Endpoints>
  </Resources>

and code sample:

  protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners()
        {
            return new[]
            {
                 new ServiceInstanceListener((context) =>
                {

                    // return new FabricTransportServiceRemotingListener(context, this);

                      return new FabricTransportServiceRemotingListener(context, this,new Microsoft.ServiceFabric.Services.Remoting.FabricTransport.Runtime.FabricTransportRemotingListenerSettings(){EndpointResourceName = "ServiceEndpointV2" });

                }),
                new ServiceInstanceListener(serviceContext =>
                    new KestrelCommunicationListener(serviceContext, "httpServiceEndpoint", (url, listener) =>
                    {
                        ServiceEventSource.Current.ServiceMessage(serviceContext, $"Starting Kestrel on {url}");

                        return new WebHostBuilder()
                                    .UseKestrel()
                                    .ConfigureServices(
                                        services => services
                                            .AddSingleton<StatelessServiceContext>(serviceContext))
                                    .UseContentRoot(Directory.GetCurrentDirectory())
                                    .UseStartup<Startup>()
                                    .UseServiceFabricIntegration(listener, ServiceFabricIntegrationOptions.None)
                                    .UseUrls(url)
                                    .Build();
                    }))
         };
        }

Is there any mistake in this configuration?

Update:

Below code is the service sample method calling from the client:

 public Task<string> OnRouteMessageaAsync(string tenant)
   {
            return Task.FromResult(tenant);
   }

Client code:

 private async Task<string> RemoteServiceCall()
        {
            try
            {
                var client = ServiceProxy.Create<ICommunication>(new Uri("fabric:/AuthenticationServiceApp/AuthenticationServiceApi"), listenerName: "RemotingListener");
                var response = client.OnRouteMessageaAsync("tenant");
                return response.Result;
            }
            catch (Exception ex)
            {

            }
            return null;
        }

Sample code is in following GitHub link: serviceappcode

Answer 1

You have defined multiple ServiceInstanceListeners. In order for Service Fabric to distinct them you need to name them using the optional name parameter of the constructor of ServiceInstanceListener. See the docs:

Name

Name of the communication listener. This parameter is optional if the Stateless Service has only one communication listener. If it is not given, the Name is set to DefaultName.

    protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners()
    {
        return new[]
        {
            new ServiceInstanceListener((context) =>
            {

                // return new FabricTransportServiceRemotingListener(context, this);

                return new FabricTransportServiceRemotingListener(context, this,new Microsoft.ServiceFabric.Services.Remoting.FabricTransport.Runtime.FabricTransportRemotingListenerSettings(){EndpointResourceName = "ServiceEndpointV2" });

            }, name: "RemotingListener"),
            new ServiceInstanceListener(serviceContext =>
                new KestrelCommunicationListener(serviceContext, "httpServiceEndpoint", (url, listener) =>
                {
                    ServiceEventSource.Current.ServiceMessage(serviceContext, $"Starting Kestrel on {url}");

                    return new WebHostBuilder()
                        .UseKestrel()
                        .ConfigureServices(
                            services => services
                                .AddSingleton<StatelessServiceContext>(serviceContext))
                        .UseContentRoot(Directory.GetCurrentDirectory())
                        .UseStartup<Startup>()
                        .UseServiceFabricIntegration(listener, ServiceFabricIntegrationOptions.None)
                        .UseUrls(url)
                        .Build();
                }), name: "KestrelCommunicationListener")
        };
    }

Now, you have to use this name as well when you are calling the service using remoting:

var client = ServiceProxy.Create<ICommunication>(
    new Uri("fabric:/AuthenticationServiceApp/AuthenticationServiceApi"), 
    listenerName: "RemotingListener"); 
var result = client.OnRouteMessageaAsync("topic");