c# - HttpContext和TelemetryInitializer

Question

我想将用户的“client_id”声明作为属性附加到发送给Application Insights的每个请求中。

从我所读的内容中，我应该实现ITelemetryInitializer，但是我需要用于请求的HttpContext才能检索“client_id”。看到我的初始化器:

public class ClaimTelemetryInitializer : ITelemetryInitializer
{
    public HttpContext HttpContext { get; set; }

    public void Initialize(ITelemetry telemetry)
    {
        this.AddTelemetryContextPropertFromClaims(telemetry, "client_id");
    }

    private void AddTelemetryContextPropertFromClaims(ITelemetry telemetry, string claimName)
    {
        if (HttpContext != null)
        {
            var requestTelemetry = telemetry as RequestTelemetry;

            var claim = HttpContext.User.Claims.SingleOrDefault(x => x.Type.Equals(claimName, StringComparison.InvariantCultureIgnoreCase));

            if (claim != null)
            {
                telemetry.Context.Properties[claimName] = claim.Value;
            }
        }
    }
}

我可以创建一个 Action 过滤器来每次设置上下文，但这感觉很糟糕:

public class TrackClaimsAttribute : ActionFilterAttribute
{
    public override Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
    {
        var initialiser = TelemetryConfiguration.Active.TelemetryInitializers.OfType<ClaimTelemetryInitializer>().Single();

        initialiser.HttpContext = context.HttpContext;

        return base.OnActionExecutionAsync(context, next);
    }
}

有没有更好的方法来实现我想做的事？

Answer 1

您应该实现为您提供HttpContext的WebTelemetryInitializerBase。

您的代码应如下所示:

public class ClaimTelemetryInitializer : WebTelemetryInitializerBase
{
    protected override void OnInitializeTelemetry(
            HttpContext platformContext,
            RequestTelemetry rootRequestTelemetry, 
            ITelemetry telemetry) {

            var claim = HttpContext.User.Claims.SingleOrDefault(x => x.Type.Equals(claimName, StringComparison.InvariantCultureIgnoreCase));

            if (claim != null)
            {
                telemetry.Context.Properties[claimName] = claim.Value;
            }
    }
}