[英]How to setup a per request global variable for NLog?
我正在以最有用的方式為我們的Web應用程序設置NLogs
我的思考過程如下
這樣,可以很容易地跟蹤從請求開始到完成的所有事件
在某些情況下,如果線程影響此解決方案,我將並行運行服務方法
我嘗試設置以下內容,但${activityid}
似乎沒有結轉到輸出中
https://github.com/NLog/NLog/wiki/Trace-Activity-Id-Layout-Renderer
Ultimatley這就是我最終要做的
我設置了一個新類,以使請求數據可輕松在系統中的任何位置使用
public static class HttpContextRequestData
{
public static string RequestGuid
{
get
{
if (HttpContext.Current.Items["RequestGuid"] == null)
return string.Empty;
else
return HttpContext.Current.Items["RequestGuid"] as string;
}
set
{
HttpContext.Current.Items["RequestGuid"] = value;
}
}
public static DateTime RequestInitiated
{
get
{
if (HttpContext.Current.Items["RequestInitiated"] == null)
return DateTime.Now;
else
return Convert.ToDateTime(HttpContext.Current.Items["RequestInitiated"]);
}
set
{
HttpContext.Current.Items["RequestInitiated"] = value;
}
}
}
然后,我設置global.asax為每個請求設置一個Guid。 我還添加了一些基本規則來記錄請求長度,如果超過1分鍾則致命
protected void Application_BeginRequest(object sender, EventArgs e)
{
HttpContextRequestData.RequestGuid = Guid.NewGuid().ToString();
HttpContextRequestData.RequestInitiated = DateTime.Now;
logger.Info("Application_BeginRequest");
}
void Application_EndRequest(object sender, EventArgs e)
{
var requestAge = DateTime.Now.Subtract(HttpContextRequestData.RequestInitiated);
if (requestAge.TotalSeconds <= 20)
logger.Info("Application_End, took {0} seconds", requestAge.TotalSeconds);
else if (requestAge.TotalSeconds <= 60)
logger.Warn("Application_End, took {0} seconds", requestAge.TotalSeconds);
else
logger.Fatal("Application_End, took {0} seconds", requestAge.TotalSeconds);
}
然后,為了使事情變得更簡單,我設置了一個自定義的NLog LayoutRender,以便將RequestGuid自動添加到記錄事件中,而不必記住將其包括在內
[LayoutRenderer("RequestGuid")]
public class RequestGuidLayoutRenderer : LayoutRenderer
{
protected override void Append(StringBuilder builder, LogEventInfo logEvent)
{
builder.Append(HttpContextRequestData.RequestGuid);
}
}
在NLog.config中注冊了RequestGuidLayoutRenderer
<extensions>
<add assembly="InsertYourAssemblyNameHere"/>
</extensions>
最后添加到我的目標配置
<target name="AllLogs" xsi:type="File" maxArchiveFiles="30" fileName="${logDirectory}/AllLogs.log" layout="${longdate}|${RequestGuid}|${level:uppercase=true}|${message}|${exception:format=tostring}"
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