Application Insights 请求遥测缺少基本路径

Question

我有一个 ASP.NET Core 2.1 WebApi 在反向代理（Azure 应用程序网关）后面的 Service Fabric 节点上运行。

网址如下：

• https://mycustomdomain.demo/product/api/controller/action（公开）
• http://myinternalserver:12345/product/api/controller/action（内部）
• https://mycustomdomain.demo/controller/action（应用洞察请求遥测）

Application Insights 照常添加。

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddApplicationInsightsTelemetry();

                new ServiceInstanceListener(serviceContext => new HttpSysCommunicationListener(serviceContext, "ServerServiceEndpoint",
                    (url, listener) =>
                    {
                        var endpointConfig = serviceContext.CodePackageActivationContext.GetEndpoint("ServerServiceEndpoint");

                        return new WebHostBuilder()
                            .UseHttpSys()
                            .ConfigureServices(services => services.AddSingleton(serviceContext))
                            .UseContentRoot(Directory.GetCurrentDirectory())
                            .UseServiceFabricIntegration(listener, ServiceFabricIntegrationOptions.None)
                            .UseStartup<Startup>()
                            .UseUrls($"{url}{endpointConfig.PathSuffix}") // "/product/api"
                            .Build();
                    }))

所以endpointConfig.PathSuffix 没有被添加到请求遥测中。我能做些什么来解决这个问题？我更愿意编写自定义遥测初始化程序或处理器。

我尝试将此行添加到我的 WebHostBuilder 中，但行为没有任何改变：

                            .Configure(app => app.UsePathBase(endpointConfig.PathSuffix))

编辑：PathBase 被 ASP.NET Core 正确识别，但请求遥测中缺少它。如果我设置一个没有 Service Fabric 的独立项目，PathBase 会按预期添加到 Request Telemetry。

Answer 1

根据docs，需要注册一个TelemetryInitializer，并调用UseApplicationInsights：

.UseKestrel()
    .ConfigureServices(
        services => services
            .AddSingleton<HttpClient>(new HttpClient())
            .AddSingleton<FabricClient>(new FabricClient())
            .AddSingleton<StatelessServiceContext>(serviceContext)
            .AddSingleton<ITelemetryInitializer>((serviceProvider) => FabricTelemetryInitializerExtension.CreateFabricTelemetryInitializer(serviceContext)))
    .UseContentRoot(Directory.GetCurrentDirectory())
    .UseStartup<Startup>()
    .UseApplicationInsights()
    .UseServiceFabricIntegration(listener, ServiceFabricIntegrationOptions.None)
    .UseUrls(url)
    .Build();
    ...

要解决此问题，您可以创建一个自定义遥测初始化程序，如下所示：

class RewriteUriInitializer : ITelemetryInitializer
{
    private const int SegmentsToSkip = 3;

    public void Initialize(ITelemetry telemetry)
    {
        var requestTelemetry = telemetry as RequestTelemetry;
        if (requestTelemetry != null)
        {
            //change requestTelemetry.Url and requestTelemetry.Name 
        }

（来自issue的灵感。）

Answer 2

为了完整起见，这是我根据 LoekD 的信息实施的解决方法：

new ServiceInstanceListener(serviceContext => new HttpSysCommunicationListener(serviceContext, "ServerServiceEndpoint",
    (url, listener) =>
    {
        var endpointConfig = serviceContext.CodePackageActivationContext.GetEndpoint("ServerServiceEndpoint");

        return new WebHostBuilder()
            .UseHttpSys()
            .ConfigureServices(services => services
                .AddSingleton(serviceContext)
                .AddSingleton<ITelemetryInitializer>(c => new RewriteUriInitializer(endpointConfig.PathSuffix)))
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseServiceFabricIntegration(listener, ServiceFabricIntegrationOptions.None)
            .UseStartup<Startup>()
            .UseUrls($"{url}{endpointConfig.PathSuffix}") // "/product/api"
            .Build();
    }))

class RewriteUriInitializer : ITelemetryInitializer
{
    private readonly string _EndpointConfigPathSuffix;

    public RewriteUriInitializer(string endpointConfigPathSuffix)
    {
        _EndpointConfigPathSuffix = endpointConfigPathSuffix;
    }

    public void Initialize(ITelemetry telemetry)
    {
        if (telemetry is RequestTelemetry requestTelemetry && requestTelemetry.Url != null)
        {
            // https://localhost:1234/controller/action => https://localhost:1234/product/api/controller/action
            requestTelemetry.Url = new Uri(
                new Uri(requestTelemetry.Url.AbsoluteUri.Substring(0,
                    requestTelemetry.Url.AbsoluteUri.IndexOf(requestTelemetry.Url.PathAndQuery, 
                       StringComparison.OrdinalIgnoreCase))),
                $"{_EndpointConfigPathSuffix}{requestTelemetry.Url.PathAndQuery}");
        }
    }
}