ASP.Net MVC AsyncController日志請求處理時間

Question

我需要獲得asp.net MVC的請求處理時間。 我使用IHttpModule訂閱onBeginRequest和onEndRequest事件。 對於同步控制器，它工作得很好但是對於異步它會返回錯誤的結果（例如，當實時約為2分鍾時為20ms）。 如何以一般方式獲取AsyncController的請求處理時間（不為每個異步操作在ActionAsync / ActionCompleted中編寫附加代碼）？

public class TrackRequestModule : RequestProcessingModuleBase, IHttpModule
{
    public const string BeginRequestTimeKey = "beginRequestTime";

    public void Init(HttpApplication context)
    {
        if (context == null)
        {
            throw new ArgumentNullException("context");
        }

        context.BeginRequest += onBeginRequest;
        context.EndRequest += onEndRequest;
    }

    private void onEndRequest(object sender, EventArgs e)
    {
        InvokeHandler(sender, OnEndRequest);
    }

    private void onBeginRequest(object sender, EventArgs e)
    {
        InvokeHandler(sender, OnBeginRequest);
    }

    public void OnBeginRequest(HttpContextBase context)
    {
        context.Items[BeginRequestTimeKey] = DateTime.Now.ToLocalTime();
    }

    public void OnEndRequest(HttpContextBase context)
    {
        var beginRequestTime = (DateTime)context.Items[BeginRequestTimeKey];
        TimeSpan elapsedTime = DateTime.Now.ToLocalTime() - beginRequestTime;

        var info = new RequestData
                    {
                        BeginTime = beginRequestTime,
                        ElapsedTimeMilliseconds = elapsedTime.Milliseconds,
                        Url = context.Request.Url.AbsoluteUri,
                        Data = GetRequestData(context.Request)
                    };
        ThreadPool.QueueUserWorkItem(logRequestInfo, info);
    }

    public void Dispose() { }

    private void logRequestInfo(object state)
    {
        var info = (RequestData)state;
        var queryStore = ObjectBuilder.Instance.Resolve<IRequestTrackingDataQueryStore>();
        queryStore.SaveRequestTrackingData(info.BeginTime, info.ElapsedTimeMilliseconds, info.Url, info.Data);
    }

    private sealed class RequestData
    {
        public DateTime BeginTime { get; set; }
        public int ElapsedTimeMilliseconds { get; set; }
        public string Url { get; set; }
        public string Data { get; set; }
    }
}

Answer 1

這很奇怪。 通常這種情況應該有效。 遺憾的是，您沒有顯示您的代碼，因此很難說您可能做錯了什么。

此外，我無法重現它。 這是我寫的測試模塊：

public class MeasureModule : IHttpModule
{
    private static readonly ReaderWriterLockSlim _gateway = new ReaderWriterLockSlim();

    public void Dispose()
    {
    }

    public void Init(HttpApplication context)
    {
        context.BeginRequest += (sender, e) =>
        {
            var app = (sender as HttpApplication);
            var watch = Stopwatch.StartNew();
            app.Context.Items["watch"] = watch;
        };

        context.EndRequest += (sender, e) =>
        {
            var app = (sender as HttpApplication);
            var watch = app.Context.Items["watch"] as Stopwatch;
            watch.Stop();
            var url = app.Context.Request.Url.AbsoluteUri;
            var message = string.Format("url: {0}, time: {1}ms", url, watch.ElapsedMilliseconds);
            var log = HostingEnvironment.MapPath("~/log.txt");
            _gateway.EnterWriteLock();
            try
            {
                File.AppendAllLines(log, new[] { message });
            }
            finally
            {
                _gateway.ExitWriteLock();
            }
        };
    }
}

我在web.config中注冊了（我在Cassini下測試過，如果你打算使用IIS 7，你必須在相應的<system.webServer>部分注冊模塊）：

<httpModules>
  <add name="measure" type="MvcApplication.Modules.MeasureModule, MvcApplication" />
</httpModules>

然后寫了一個樣本控制器來測試：

[SessionState(SessionStateBehavior.Disabled)]
public class HomeController : AsyncController
{
    public ActionResult IndexSync()
    {
        Thread.Sleep(5000);
        return Content("completed", "text/plain"); 
    }

    public void IndexAsync()
    {
        AsyncManager.OutstandingOperations.Increment();
        Task.Factory.StartNew(() =>
        {
            Thread.Sleep(5000);
            AsyncManager.OutstandingOperations.Decrement();
        });
    }

    public ActionResult IndexCompleted()
    {
        return Content("completed", "text/plain");
    }
}

然后我向以下網址發出了兩個並行HTTP請求：

• /home/index
• /home/indexsync

2個請求在大約5秒后按預期完成，並且日志文件看起來完全正常：

url: http://localhost:14953/home/index, time: 5047ms
url: http://localhost:14953/home/indexsync, time: 5005ms

如您所見，HTTP模塊正確地測量了異步和同步操作的執行時間。

什么給出了什么？

順便說一句，您可以檢查MiniProfiler並確保您的方案沒有輪盤重新設置。