帶有OWIN自托管偵聽器的Azure Service Fabric

Question

在我的無狀態服務之一中，我想包括兩個偵聽器：

• Service Fabric提供的偵聽器，用於服務之間的內部通信
• 根據示例實現的基於OWIN自托管的偵聽器（ https://github.com/Azure/azure-content/blob/master/articles/service-fabric/service-fabric-reliable-services-communication-webapi.md ）

當我嘗試以標准方式注冊創建的偵聽器時，我遇到一個問題，即基於OWIN的偵聽器在初始化后會自動關閉：

負責注冊服務的部分：

        protected override IEnumerable<ServiceReplicaListener> CreateServiceReplicaListeners()
        {
           return new List<ServiceReplicaListener>
           {
              new ServiceReplicaListener(parameters => new OwinCommunicationListener("account",new Startup(), parameters)),
              new ServiceReplicaListener(parameters => new ServiceRemotingListener<AccountService>(parameters, this))

        };
    }

ServiceManifest端口設置：

<Resources>
  <Endpoints>
    <Endpoint Name="ServiceEndpoint" />
    <Endpoint Name="WebApiEndpoint" Type="Input" Protocol="http" Port="8083"/>
    <Endpoint Name="ReplicatorEndpoint" />
  </Endpoints>
</Resources>

OwinCommunicationListener：

public class OwinCommunicationListener: ICommunicationListener
{
    private readonly IOwinAppBuilder startup;
    private readonly string appRoot;
    private IDisposable serverHandle;
    private string listeningAddress;
    private readonly ServiceInitializationParameters serviceInitializationParameters;

    public OwinCommunicationListener(string appRoot, IOwinAppBuilder startup, ServiceInitializationParameters serviceInitializationParameters)
    {
        this.startup = startup;
        this.appRoot = appRoot;
        this.serviceInitializationParameters = serviceInitializationParameters;
    }

    public Task<string> OpenAsync(CancellationToken cancellationToken)
    {
        EndpointResourceDescription serviceEndpoint = serviceInitializationParameters.CodePackageActivationContext.GetEndpoint("WebApiEndpointB");
        int port = serviceEndpoint.Port;
        listeningAddress = string.Format(CultureInfo.InvariantCulture,"http://+:{0}/{1}",port,string.IsNullOrWhiteSpace(appRoot)? string.Empty: appRoot.TrimEnd('/') + '/');
        serverHandle = WebApp.Start(listeningAddress, appBuilder => startup.Configuration(appBuilder));
        string publishAddress = listeningAddress.Replace("+", FabricRuntime.GetNodeContext().IPAddressOrFQDN);
        ServiceEventSource.Current.Message("Listening on {0}", publishAddress);
        return Task.FromResult(publishAddress);
    }
    ...
}

如何解決此問題並注冊這兩個偵聽器？

Answer 1

當您有多個偵聽器時，必須給他們指定唯一的名稱。 因此，您的服務可能會失敗，這將導致它一遍又一遍地打開和關閉：

    protected override IEnumerable<ServiceReplicaListener> CreateServiceReplicaListeners()
    {
        return new List<ServiceReplicaListener>
       {
          new ServiceReplicaListener(parameters => new OwinCommunicationListener("account",new Startup(), parameters), "accountListener"),
          new ServiceReplicaListener(parameters => new ServiceRemotingListener<AccountService>(parameters, this), "remotingListener")
        }
    }