动态Servicefabric设置和替代

时间:2018-10-17 15:18:52

标签: azure-service-fabric service-fabric-on-premises

是否有一种方法可以不告诉服务所有设置,而仅在应用程序级别提供设置?

我仍然对servicefabric配置的工作方式不满意。

据我所知,我必须在服务的settings.xml中指定所有可能的配置值。然后,我可以在应用程序的ApplicationParameters中覆盖它们。对于每个文档,这看起来也适用于环境变量。

造成的麻烦是,在许多情况下,我们的配置用于为数组添加选项。

例如考虑json:

{
  "AuthorizationOptions": {
    "Policies": [
      {
        "Name": "User",
        "Groups": [ "Domain Users" ]
      }
    ]
  }  
}

有2个数组;是必要和有用的。为了在服务结构配置中表达这一点,它转换为:

<Section Name="AuthorizationOptions">
    <Parameter Name="Policies:0:Name" Value="User"/>
    <Parameter Name="Policies:0:Groups:0" Value="Domain Users"/>
</Section>

尽管翻译与结构化对象相比并不令人满意,但它完全可用。

但是,如果我未在服务中指定部分和参数,则似乎无法在应用程序中覆盖它们。因此,在这种情况下,我将必须定义服务中每个策略的确切策略和组数,应用程序可以修改策略名称或组值,但不能修改策略总数或组总数。

是否有一种方法可以不告诉服务所有设置,而仅在应用程序级别提供设置?

如果没有其他选择可以使服务跨应用程序重用,我可能会想使用它们来提供不同类型的动态配置?

可能有助于回答此问题的难题的最后一部分是,我正在使用一些pre-release code将服务结构设置转换为Microsoft.Extensions.Configuration.IConfiguration。但是,这只是采用它找到的设置。这不是我遇到的覆盖问题的原因。

示例服务Settings.xml:

<?xml version="1.0" encoding="utf-8" ?>
<Settings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/2011/01/fabric">
  <Section Name="AuthorizationOptions">
    <!-- I should not have to provide these at the application level!
         However, it fails to deploy if I don't. -->
    <Parameter Name="Policies:0:Name" Value="User"/>
    <Parameter Name="Policies:0:Groups:0" Value="Domain Users"/>
  </Section>
</Settings>

示例应用程序ApplicationManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<ApplicationManifest xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" ApplicationTypeName="ServiceFabric.ExampleType" ApplicationTypeVersion="1.0.0" xmlns="http://schemas.microsoft.com/2011/01/fabric">
  <Parameters>
    <Parameter Name="Service.Example_ASPNETCORE_ENVIRONMENT" DefaultValue="" />
    <Parameter Name="Service.Example_InstanceCount" DefaultValue="-1" />
    <Parameter Name="Service.Example_AuthorizationOptions_Policies_0_Name" DefaultValue="Users" />
    <Parameter Name="Service.Example_AuthorizationOptions_Policies_0_Groups_0" DefaultValue="Domain Users" />
  </Parameters>
  <ServiceManifestImport>
  <ServiceManifestImport>
    <ServiceManifestRef ServiceManifestName="Service.ExamplePkg" ServiceManifestVersion="1.0.0" />
    <ConfigOverrides>
      <ConfigOverride Name="Config">
        <Settings>
          <Section Name="AuthorizationOptions">
            <Parameter Name="Policies:0:Name" Value="[Service.Example_AuthorizationOptions_Policies_0_Name]" />
            <Parameter Name="Policies:0:Groups:0" Value="[Service.Example_AuthorizationOptions_Policies_0_Groups_0]" />
          </Section>
        </Settings>
      </ConfigOverride>
    </ConfigOverrides>
    <EnvironmentOverrides CodePackageRef="code">
      <EnvironmentVariable Name="ASPNETCORE_ENVIRONMENT" Value="[Service.Example_ASPNETCORE_ENVIRONMENT]" />
    </EnvironmentOverrides>
  </ServiceManifestImport>
  <DefaultServices>
    <Service Name="Service.Example" ServicePackageActivationMode="ExclusiveProcess">
      <StatelessService ServiceTypeName="Service.ExampleType" InstanceCount="[Service.Example_InstanceCount]">
        <SingletonPartition />
      </StatelessService>
    </Service>
  </DefaultServices>
</ApplicationManifest>

示例应用程序ApplicationParameters(Local.1Node.xml):

<?xml version="1.0" encoding="utf-8"?>
<Application xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Name="fabric:/ServiceFabric.Example" xmlns="http://schemas.microsoft.com/2011/01/fabric">
  <Parameters>
    <Parameter Name="Service.Example_ASPNETCORE_ENVIRONMENT" Value="Development" />
    <Parameter Name="Service.Example_InstanceCount" Value="-1" />
    <Parameter Name="Service.Example_AuthorizationOptions_Policies_0_Name" Value="Users" />
    <Parameter Name="Service.Example_AuthorizationOptions_Policies_0_Groups_0" Value="Domain Users" />
  </Parameters>
</Application>

示例应用程序PublishProfiles(Local.1Node.xml):

<?xml version="1.0" encoding="utf-8"?>
<PublishProfile xmlns="http://schemas.microsoft.com/2015/05/fabrictools">
  <ClusterConnectionParameters />
  <ApplicationParameterFile Path="..\ApplicationParameters\Local.1Node.xml" />
</PublishProfile>

应该无关,但示例使用设置:

internal sealed class Example : StatelessService
{
    public Example(StatelessServiceContext context)
        : base(context)
    { }

    protected override IEnumerable<ServiceInstanceListener> CreateServiceInstanceListeners()
    {
        return new ServiceInstanceListener[]
        {
            new ServiceInstanceListener(serviceContext =>
                new HttpSysCommunicationListener(serviceContext, "ServiceEndpoint", (url, listener) =>
                {
                    ServiceEventSource.Current.ServiceMessage(serviceContext, $"Starting HttpSys on {url}");

                    return new WebHostBuilder()
                            .UseHttpSys(options =>
                            {
                                options.Authentication.Schemes = AuthenticationSchemes.Negotiate; // Microsoft.AspNetCore.Server.HttpSys
                                                                                        options.Authentication.AllowAnonymous = false;
                            }).ConfigureServices(services => services.AddSingleton<StatelessServiceContext>(serviceContext))
                                        .UseContentRoot(Directory.GetCurrentDirectory())
                                        .ConfigureAppConfiguration((hostingContext, config) =>
                                            {
                                                config.SetBasePath(Directory.GetCurrentDirectory());
                                                config.AddServiceFabricConfiguration(FabricRuntime.GetActivationContext(), options => {
                                                    options.IncludePackageName=false;
                                                });
                                            })
                                        .UseStartup<Startup>()
                                        .UseServiceFabricIntegration(listener, ServiceFabricIntegrationOptions.None)
                                        .UseUrls(url)
                                        .Build();
                }))
        };
    }
}

从那时起,一切都按预期在IConfiguration对象中。

1 个答案:

答案 0 :(得分:2)

有许多方法可以配置服务结构应用程序,每种方法都会给您带来不同的挑战。

SF团队在文档中推荐了这种方法,因为您可以更好地控制配置的版本,并且由于在文件中明确声明了错误,因此更容易犯错误,由于限制,我使用了几种不同的方法像您一样,以下方法可能会解决您的问题:

与原始方法一样进行配置,但将复杂类型存储为JSON值:它是与推荐设计最接近的解决方案,您仍然可以在源代码控制中控制配置版本。 >

那会是这样的:

Settings.xml:

<?xml version="1.0" encoding="utf-8" ?>
<Settings xmlns... namespaces here...>
  <Section Name="AuthorizationOptions">
    <Parameter Name="Policies"/>
  </Section>
</Settings>

ApplicationManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<ApplicationManifest ApplicationTypeName="ServiceFabric.ExampleType" ApplicationTypeVersion="1.0.0" xmlns:...namespaces....>
  <Parameters>
    <Parameter Name="Service.Example_ASPNETCORE_ENVIRONMENT" DefaultValue="" />
    <Parameter Name="Service.Example_InstanceCount" DefaultValue="-1" />
    <Parameter Name="Service.Example_AuthorizationOptions_Policies" DefaultValue="[]" />
  </Parameters>
  <ServiceManifestImport>
  <ServiceManifestImport>
    <ServiceManifestRef ServiceManifestName="Service.ExamplePkg" ServiceManifestVersion="1.0.0" />
    <ConfigOverrides>
      <ConfigOverride Name="Config">
        <Settings>
          <Section Name="AuthorizationOptions">
            <Parameter Name="Policies" Value="[Service.Example_AuthorizationOptions_Policies]" />
          </Section>
        </Settings>
      </ConfigOverride>
    </ConfigOverrides>
    <EnvironmentOverrides CodePackageRef="code">
      <EnvironmentVariable Name="ASPNETCORE_ENVIRONMENT" Value="[Service.Example_ASPNETCORE_ENVIRONMENT]" />
    </EnvironmentOverrides>
  </ServiceManifestImport>
  <DefaultServices>
    <Service Name="Service.Example" ServicePackageActivationMode="ExclusiveProcess">
      <StatelessService ServiceTypeName="Service.ExampleType" InstanceCount="[Service.Example_InstanceCount]">
        <SingletonPartition />
      </StatelessService>
    </Service>
  </DefaultServices>
</ApplicationManifest>

ApplicationParameters.xml

<?xml version="1.0" encoding="utf-8"?>
<Application Name="fabric:/ServiceFabric.Example" xmlns:...namespaces....>
  <Parameters>
    <Parameter Name="Service.Example_ASPNETCORE_ENVIRONMENT" Value="Development" />
    <Parameter Name="Service.Example_InstanceCount" Value="-1" />
    <Parameter Name="Service.Example_AuthorizationOptions_Policies" Value="[{'Name': 'User','Groups': ['Domain Users']}, {'Name': 'Admin','Groups': ['Administrators']}]" />
  </Parameters>
</Application>

在您的服务代码中:

public class Policy
{
    public string Name { get; set; }
    public string[] Groups { get; set; }
}


var settings = this.Context.CodePackageActivationContext.GetConfigurationPackageObject("Config").Settings;
var authOptions = settings.Sections["AuthorizationOptions"].Parameters["Policies"].Value;
var obj = JsonConvert.DeserializeObject<Policy[]>(authOptions);
  

您可以更进一步并存储整个   AuthorizationOptions作为JSON,但如前所述,更多   它变得通用,容易犯错误并且更难发现   配置问题。