Question

我想在.net core 2.1中使用https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.hosting.ihostedservice?view=aspnetcore-2.1执行后台任务，并且需要在PCF中托管。当我在本地运行时，一切正常。启动启动后，将调用我的IHostedService的实现，并且可以通过https://docs.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.hosting.iapplicationlifetime.stopapplication?view=aspnetcore-2.1优雅地终止应用程序。但是当我主持PCF时，我遇到了错误

2018-11-09T18:27:35.359+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [OUT] Finished executing task!
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] Unhandled Exception: System.Net.Sockets.SocketException: Permission denied
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, String callerName)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at System.Net.Sockets.Socket.DoBind(EndPoint endPointSnapshot, SocketAddress socketAddress)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at System.Net.Sockets.Socket.Bind(EndPoint localEP)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransport.BindAsync()
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.<>c__DisplayClass22_0`1.<<StartAsync>g__OnBind|0>d.MoveNext()
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] --- End of stack trace from previous location where exception was thrown ---
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindEndpointAsync(ListenOptions endpoint, AddressBindContext context)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Core.ListenOptions.BindAsync(AddressBindContext context)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Core.AnyIPListenOptions.BindAsync(AddressBindContext context)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.AddressesStrategy.BindAsync(AddressBindContext context)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.AddressBinder.BindAsync(IServerAddressesFeature addresses, KestrelServerOptions serverOptions, ILogger logger, Func`2 createBinding)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Server.Kestrel.Core.KestrelServer.StartAsync[TContext](IHttpApplication`1 application, CancellationToken cancellationToken)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Hosting.Internal.WebHost.StartAsync(CancellationToken cancellationToken)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token, String shutdownMessage)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Hosting.WebHostExtensions.RunAsync(IWebHost host, CancellationToken token)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at Microsoft.AspNetCore.Hosting.WebHostExtensions.Run(IWebHost host)
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at DlqProcessingApp.Program.Main(String[] args) in C:\GitRepos\DeadLetterQueueProcessingTask\Program.cs:line 72
2018-11-09T18:27:35.365+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [ERR] at DlqProcessingApp.Program.<Main>(String[] args)
2018-11-09T18:27:35.381+05:30 [APP/TASK/execute-dlqprcoessing-task/0] [OUT] Exit status 134

我正在如下Startup.cs中注册IHostedService

     public class Startup
        {
            public Startup(IConfiguration configuration)
            {
                Configuration = configuration;
            }

            public IConfiguration Configuration { get; }

            // This method gets called by the runtime. Use this method to add services to the container.
            public void ConfigureServices(IServiceCollection services)
            {

                 // Add management endpoint services
                services.AddCloudFoundryActuators(Configuration);
                services.AddSingleton<IHostedService, DlqProcessingHostedService>();

My implementation looks like below

    public class DlqProcessingHostedService : IHostedService
        {
            private readonly IApplicationLifetime _appLifetime;

            private readonly ILogger<DlqProcessingHostedService> _logger;

            private readonly IServiceScopeFactory _serviceScopeFactory;

            public DlqProcessingHostedService(IApplicationLifetime appLifetime,
                IServiceScopeFactory serviceScopeFactory,
                ILogger<DlqProcessingHostedService> logger)
            {
                _appLifetime = appLifetime;
                _logger = logger;
                _serviceScopeFactory = serviceScopeFactory;
            }

            public async Task StartAsync(CancellationToken cancellationToken)
            {
                using (var scope = _serviceScopeFactory.CreateScope())
                {
                    var he = scope.ServiceProvider.GetRequiredService<HealthEndpoint>();
                    var worker = scope.ServiceProvider.GetRequiredService<IWorker>();
                    CheckStartupHealth(he);
                    await worker.ProcessDlxMessages();
                }
                _appLifetime.StopApplication();
            }

            public async Task StopAsync(CancellationToken cancellationToken)
            {
                _logger.LogInformation("Finished executing task!");
            }

顺便说一句，如果我使用的是通用主机https://jmezach.github.io/2017/10/29/having-fun-with-the-.net-core-generic-host/而不是WebHost，则可以正常工作。因此，基本上我想知道IHostedService实现在PCF环境中是否对WebHost产生任何问题（尽管在本地运行良好）。我正在使用以下软件包，并以cflinuxfs2堆栈为目标。请让我知道我可能做错了。

    <Project Sdk="Microsoft.NET.Sdk.Web">

      <PropertyGroup>
        <TargetFramework>netcoreapp2.1</TargetFramework>
        <LangVersion>7.1</LangVersion>
      </PropertyGroup>

      <ItemGroup>
        <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.0" />
        <PackageReference Include="Steeltoe.Extensions.Configuration.CloudFoundryCore" Version="2.1.1" />
        <PackageReference Include="RabbitMQ.Client" Version="5.1.0" />
        <PackageReference Include="Steeltoe.CloudFoundry.ConnectorCore" Version="2.1.1" />
        <PackageReference Include="Steeltoe.Management.CloudFoundryCore" Version="2.1.1" />
      </ItemGroup>

这是我的Program.cs

  public class Program
    {
        public static async Task Main(string[] args)

        {

            //var host = new HostBuilder()
            //.ConfigureAppConfiguration((hostContext, config) =>
            //{
            //    var env = hostContext.HostingEnvironment;
            //    config.SetBasePath(Directory.GetCurrentDirectory());
            //    config.AddEnvironmentVariables();
            //    config.AddCommandLine(args);
            //    config.AddJsonFile("appsettings.json", true, false);
            //    config.AddJsonFile($"appsettings.{env.EnvironmentName}.json", true, false);
            //    config.AddCloudFoundry();
            //})
            //.ConfigureServices((hostContext, services) =>
            //{
            //    ConfigureServices(services, hostContext.Configuration);
            //})
            //.ConfigureLogging((hostContext, logBuilder) =>
            //{
            //    logBuilder.ClearProviders();
            //    logBuilder.AddConfiguration(hostContext.Configuration.GetSection("Logging"));
            //    logBuilder.AddDynamicConsole();
            //    if (hostContext.HostingEnvironment.IsDevelopment())
            //    {
            //        logBuilder.AddDebug();
            //    }
            //});
            //await host.RunConsoleAsync();

            BuildWebHost(args).Run();
            Console.WriteLine("Finished executing task!");
        }

        public static IWebHost BuildWebHost(string[] args) =>
           WebHost
           .CreateDefaultBuilder(args)
           .UseStartup<Startup>()
           .ConfigureAppConfiguration((builderContext, config) =>
           {
               config.AddCloudFoundry();
           })
           .ConfigureLogging((hostContext, logBuilder) =>
           {
               logBuilder.ClearProviders();
               logBuilder.AddConfiguration(hostContext.Configuration.GetSection("Logging"));
               logBuilder.AddDynamicConsole();
               if (hostContext.HostingEnvironment.IsDevelopment())
               {
                   logBuilder.AddDebug();
               }
           }).Build();

Answer 1

我尝试根据您到目前为止提供的内容使用基本示例来重新创建此示例，但是在PCF上对我来说效果很好-错误可能来自代码中的其他地方

使用.net core 2.1通过IHostedService在PCF中运行后台任务

1 个答案: