服務結構無狀態服務器自定義UDP偵聽器

Question

我們正在嘗試定義一個服務結構無狀態服務，該服務可偵聽UDP數據。

我們正在與Microsoft合作，他們說它已受支持，我應該設置TCP。 以下是ServiceManifest.xml文件中的代碼段：

<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="ServiceEndpoint" Protocol="tcp" Port="12345" Type="Input" />
    </Endpoints>
</Resources>

該服務可以正常啟動，但是我無法使該服務接收任何UDP數據，如果我執行netstat -a ，則無法看到任何偵聽TCP或UDP端口的內容。

我已經在網上進行了大量研究，但在創建自定義ICommunicationListener方面卻沒有發現太多，但我希望其他人能夠驗證SF是否應該這樣做。

這是ICommunicationListener實現：

public UdpCommunicationListener(string serviceEndPoint,
            ServiceInitializationParameters serviceInitializationParameters, Action<UdpReceiveResult> connector)
   {
       if (serviceInitializationParameters == null)
       {
           throw new ArgumentNullException(nameof(serviceInitializationParameters));
       }

       var endPoint = serviceInitializationParameters
            .CodePackageActivationContext
            .GetEndpoint(serviceEndPoint ?? "ServiceEndPoint");

       _connector = connector;

        _ipAddress = FabricRuntime.GetNodeContext().IPAddressOrFQDN;
        _port = endPoint.Port;

        _server = new UdpServer(_ipAddress, _port);

        _server.Open();
    }

    public Task<string> OpenAsync(CancellationToken cancellationToken)
    {
        _listener = _server.Listen(_connector);

        return Task.FromResult($"udp::{_ipAddress}:{_port}");
    }

    public Task CloseAsync(CancellationToken cancellationToken)
    {
        this.Abort();

        return Task.FromResult(true);
    }

    public void Abort()
    {
        _listener.Dispose();
        _server?.Close();
    }
}

public class UdpServer
{
    private readonly UdpClient _udpClient;
    private IObservable<UdpReceiveResult> _receiveStream;

    public UdpServer(string ipAddress, int port)
    {
        Id = Guid.NewGuid();

        _udpClient = new UdpClient(ipAddress, port);
    }

    public Guid Id { get; }

    public void Open()
    {
        _receiveStream = _udpClient.ReceiveStream().Publish().RefCount();
    }

    public void Close()
    {
        //TODO: Not sure how to stop the process
    }

    public IDisposable Listen(Action<UdpReceiveResult> process)
    {
        return _receiveStream.Subscribe(async r =>
        {
                process(r);
        });
    }
}

Answer 1

我讓Udp作為無狀態服務工作。 這是代碼：

UdpService.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Fabric;
using System.Linq;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.ServiceFabric.Services.Communication.Runtime;
using Microsoft.ServiceFabric.Services.Runtime;

namespace UdpService
{
    /// <summary>
    /// An instance of this class is created for each service instance by the Service Fabric runtime.
    /// </summary>
    internal sealed class UdpService : StatelessService
    {
        private UdpCommunicationListener listener;

        public UdpService(StatelessServiceContext context)
            : base(context)
        { }

        protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners()
        {
            yield return new ServiceInstanceListener(initParams =>
            {
                this.listener = new UdpCommunicationListener();
                this.listener.Initialize(initParams.CodePackageActivationContext);

                return this.listener;
            });
        }
    }
}

UdpCommunicationListener

using System;
using System.Diagnostics;
using System.Fabric;
using System.Fabric.Description;
using System.Globalization;
using System.Net;
using System.Net.Sockets;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

using Microsoft.ServiceFabric.Services.Communication.Runtime;

namespace UdpService
{
    public class UdpCommunicationListener : ICommunicationListener, IDisposable
    {
        private readonly CancellationTokenSource processRequestsCancellation = new CancellationTokenSource();

        public int Port { get; set; }

        private UdpClient server;

        /// <summary>
        /// Stops the Server Ungracefully
        /// </summary>
        public void Abort()
        {
            this.StopWebServer();
        }

        /// <summary>
        /// Stops the Server Gracefully
        /// </summary>
        /// <param name="cancellationToken">Cancellation Token</param>
        /// <returns>Task for Asynchron usage</returns>
        public Task CloseAsync(CancellationToken cancellationToken)
        {
            this.StopWebServer();

            return Task.FromResult(true);
        }

        /// <summary>
        /// Free Resources
        /// </summary>
        public void Dispose()
        {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }

        /// <summary>
        /// Initializes Configuration
        /// </summary>
        /// <param name="context">Code Package Activation Context</param>
        public void Initialize(ICodePackageActivationContext context)
        {
            EndpointResourceDescription serviceEndpoint = context.GetEndpoint("ServiceEndpoint");
            this.Port = serviceEndpoint.Port;
        }

        /// <summary>
        /// Starts the Server
        /// </summary>
        /// <param name="cancellationToken">Cancellation Token</param>
        /// <returns>Task for Asynchron usage</returns>
        public Task<string> OpenAsync(CancellationToken cancellationToken)
        {
            try
            {
                this.server = new UdpClient(this.Port);
            }
            catch (Exception ex)
            {
            }

            ThreadPool.QueueUserWorkItem((state) =>
            {
                this.MessageHandling(this.processRequestsCancellation.Token);
            });

            return Task.FromResult("udp://" + FabricRuntime.GetNodeContext().IPAddressOrFQDN + ":" + this.Port);
        }

        protected void MessageHandling(CancellationToken cancellationToken)
        {
            while (!cancellationToken.IsCancellationRequested)
            {
                IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Any, this.Port);
                byte[] receivedBytes = this.server.Receive(ref ipEndPoint);
                this.server.Send(receivedBytes, receivedBytes.Length, ipEndPoint);
                Debug.WriteLine("Received bytes: " + receivedBytes.Length.ToString());
            }
        }

        /// <summary>
        /// Receives the specified endpoint.
        /// </summary>
        /// <param name="endpoint">The endpoint.</param>
        /// <returns></returns>
        public Task<byte[]> Receive(ref IPEndPoint endpoint)
        {
            return Task.FromResult(this.server.Receive(ref endpoint));
        }

        /// <summary>
        /// Free Resources and Stop Server
        /// </summary>
        /// <param name="disposing">Disposing .NET Resources?</param>
        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (this.server != null)
                {
                    try
                    {
                        this.server.Close();
                        this.server = null;
                    }
                    catch (Exception ex)
                    {
                        ServiceEventSource.Current.Message(ex.Message);
                    }
                }
            }
        }

        /// <summary>
        /// Stops Server and Free Handles
        /// </summary>
        private void StopWebServer()
        {
            this.processRequestsCancellation.Cancel();
            this.Dispose();
        }
    }
}

最后但並非最不重要的一點是ServiceManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<ServiceManifest Name="UdpServicePkg"
                 Version="1.0.0"
                 xmlns="http://schemas.microsoft.com/2011/01/fabric"
                 xmlns:xsd="http://www.w3.org/2001/XMLSchema"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <ServiceTypes>
    <!-- This is the name of your ServiceType. 
         This name must match the string used in RegisterServiceType call in Program.cs. -->
    <StatelessServiceType ServiceTypeName="UdpServiceType" />
  </ServiceTypes>

  <!-- Code package is your service executable. -->
  <CodePackage Name="Code" Version="1.0.0">
    <EntryPoint>
      <ExeHost>
        <Program>UdpService.exe</Program>
      </ExeHost>
    </EntryPoint>
  </CodePackage>

  <!-- Config package is the contents of the Config directoy under PackageRoot that contains an 
       independently-updateable and versioned set of custom configuration settings for your service. -->
  <ConfigPackage Name="Config" Version="1.0.0" />

  <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="ServiceEndpoint" Port="5555" />
    </Endpoints>
  </Resources>
</ServiceManifest>

Answer 2

我解決了UdpServer組件的一個缺陷，該缺陷現在可以在Service Fabric服務中托管。

此行的代碼有問題：

_udpClient = new UdpClient(ipAddress, port);

這是偵聽流量的錯誤重載，它必須為：

_udpClient = new UdpClient(port);

我確實嘗試過：

_udpClient = new UdpClient(new IPAddress(IPAddress.Parse(_ipAddress)),port)

但這是行不通的。 正如通信偵聽（描述其自身）中檢索主機的那一行返回主機名而不是IPAddress一樣，我認為您可以通過對清單進行一些更改來更改此行為，但僅端口就足夠了。

Answer 3

由於僅支持協議http / https和tcp。 我猜你不能做udp協議。 UDP不可靠。 我們能夠使用SignalR，但我猜Udp無法正常工作。

編輯：您可以在我的其他文章中看到Udp現在正在工作。