Question

我编写了一个自定义HttpModule，它实现了Application_PreRequestHandlerExecute和Application_PostRequestHandlerExecute事件，以便记录所有请求时间。我正在尝试使用此HttpModule来检测MVC Web应用程序，以将所有请求的性能记录到其中。 MVC Web应用程序使用Http Session，超时设置为默认的20分钟。我们有一套JMeter负载测试，在我的HttpModule之前运行正常。但是，当我检测应用程序时，在JMeter运行其测试20分钟后，它会开始在整个地方抛出错误，表明所有会话变量都已被删除。

为什么会这样？我在HttpModule中根本没有访问会话状态，所以我对可能造成这种情况的原因感到茫然。这是自定义HttpModule的完整代码。似乎仅仅存在这个HttpModule会导致配置为使用它的任何应用程序出现会话超时问题。

public class LoggerModule : IHttpModule
{
    public void Dispose()
    {
    }

    public void Init(HttpApplication context)
    {
        if (context == null)
        {
            return;
        }

        // Using PreRequestHandlerExecute/PostRequestHandlerExecute instead of BeginRequest/EndRequest
        // from: http://stackoverflow.com/questions/12981298/how-to-analyze-the-performance-of-requests-in-asp-net-mvc-application
        // NOTE: The Web.config for each application should be configured with preCondition="managedHandler".  See
        // http://stackoverflow.com/questions/18989449/how-does-precondition-managedhandler-work-for-modules.
        // TL;DR is that this HttpModule will only run for managed resources like MVC endpoints, .aspx requests, etc. and won't run for static files.
        context.PreRequestHandlerExecute += this.Application_PreRequestHandlerExecute;
        context.PostRequestHandlerExecute += this.Application_PostRequestHandlerExecute;
    }

    private void Application_PreRequestHandlerExecute(object sender, EventArgs e)
    {
        // Store the current time in order to determine the time taken to process each request.
        (sender as HttpApplication).Context.Items["PerformanceLoggerStart"] = DateTime.Now;
    }

    private void Application_PostRequestHandlerExecute(object sender, EventArgs e)
    {
        HttpContext context = (sender as HttpApplication).Context;

        if (context == null)
        {
            return;
        }

        // Calculate the time taken to process the request
        DateTime start = (DateTime)context.Items["PerformanceLoggerStart"];
        double millisecondsTaken = (DateTime.Now - start).TotalMilliseconds;

        // Asynchronously log performance.  Note that this also insulates the profiled application from any exceptions that may be thrown by the task being done.
        Task.Run(() => Logger.LogPerformance(new LogEntry
        {
            // Get the full URL as it appears in the browser MINUS any MVC route-specific parameter like a GUID
            Endpoint = ApplicationInformation.TrimIdFromMVCRoute(context.Request.Url),

            // GET, POST, etc.
            Action = context.Request.HttpMethod,

            // Name of the machine executing this code
            MachineName = Environment.MachineName,

            // Get the application name from the URL - depends on whether running locally or remotely
            ApplicationName = ApplicationInformation.GetApplicationName(context.Request.Url, context.Request.ApplicationPath),

            // Time taken to process the request
            MillisecondsTaken = millisecondsTaken
        }));
    }
}

C＃HttpModule导致会话超时

0 个答案: