Question

我正在尝试根据从服务总线触发器接收到的消息，通过调用的外部Web服务的验证错误来丰富我的依赖遥测。

我试图像这样在HttpContextAccessor类中添加Startup：

public class Startup : IWebJobsStartup
{
    public void Configure(IWebJobsBuilder builder)
    {
        builder.Services.AddHttpClient();
        builder.Services.AddHttpContextAccessor();
        builder.Services.AddSingleton<ITelemetryInitializer, BadRequestReasonTelemetryInitializer();
    }
}

然后像下面这样在我的遥测初始化程序中利用它：

public class BadRequestReasonTelemetryInitializer : ITelemetryInitializer
{
    readonly IHttpContextAccessor _httpContextAccessor;

    public BadRequestReasonTelemetryInitializer(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    public void Initialize(ITelemetry telemetry)
    {
        if (telemetry is DependencyTelemetry req)
        {
            if (req.ResultCode == "400")
            {
                // toggle re-use
                _httpContextAccessor.HttpContext.Request.EnableRewind();

                var stream = new StreamReader(_httpContextAccessor.HttpContext.Request.Body);
                var body = stream.ReadToEnd();

                // reset stream to preserve data
                _httpContextAccessor.HttpContext.Request.Body.Position = 0;
                req.Properties.Add("Reason", body);
            }
        }
    }
}

现在问题是HttpContext始终为空。我认为这很有意义，因为我有一个带有ServiceBusTrigger的函数。但是问题是如何从外部Web服务调用中获取当前的http上下文？是否有办法以某种方式从DependencyTelemetry抢走它？我的目标是.NET Core 2.1和功能运行时v2。

编辑（为清晰起见，添加通话）：

using (var httpClient = _httpClientFactory.CreateClient())
{
    httpClient.DefaultRequestHeaders.Authorization =
        new AuthenticationHeaderValue("Bearer", authenticationResult.AccessToken);
    using (var result = await httpClient.PostAsync($"{BaseUrl}/endpoint", payload))
    {
        // if the result is 400 I would like this to go to AI through the initializer
    }
}

使用ServiceBusTrigger在Azure功能的TelemetryInitializer中访问HttpContext

0 个答案: