RE: Logging in a Web App (Threads, Sessions and Requests)

I think is it:

Imports System.Web

Public Class Log4NetHttpModule
    Implements IHttpModule

    Public Sub Init(ByVal app As HttpApplication) _
       Implements IHttpModule.Init
        AddHandler app.AuthenticateRequest, _
           AddressOf MyAuthenticateRequest
    End Sub

    Public Sub Dispose() Implements IHttpModule.Dispose
        ' add clean-up code here if required
    End Sub

    Public Sub MyAuthenticateRequest(ByVal s As Object, _
       ByVal e As EventArgs)
        Dim app As HttpApplication
        app = CType(s, HttpApplication)

        If (app.Request.IsAuthenticated = True) Then
            log4net.MDC.Set("UserIdentityName", app.User.Identity.Name)
        Else
            log4net.MDC.Set("UserIdentityName", "N/A")
        End If
        
    End Sub

End Class

I took the skeleton for the class from here:

 http://www.devx.com/dotnet/Article/6962/0/page/4

- Ron

--- "Hart, Leo" <Leo.Hart@xxxxxxx> wrote:

> I am going to try what you have suggested, although I currently know
> nothing about HttpModules (looks like I need to do some reading).
> 
> One question (though I'm ashamed I need to ask):
> 
> What's the VB.NET equivalent of
> 
>       public void Init(System.Web.HttpApplication context)
>       {
>               context.AuthorizeRequest += new
> EventHandler(context_AuthorizeRequest);
>       }
> 
> I tried:
> 
>       Public Sub Init(ByVal context As System.Web.HttpApplication)
>               AddHandler context.AuthenticateRequest, AddressOf
> context.AuthorizeRequest
>       End Sub
> 
> But it didn't like that, saying "'AddressOf' operand must be the name
> of
> a method; no parentheses are needed."
> 
> 
> Thanks,
> Leo
> 
> 
> -----Original Message-----
> From: Ron Grabowski [mailto:rongrabowski@xxxxxxxxx] 
> Sent: Thursday, February 10, 2005 9:46 AM
> To: Log4NET User
> Subject: Re: Logging in a Web App (Threads, Sessions and Requests)
> 
> 
> Have you tried creating a HttpModule and populating the MDC that way?
> There are lot of events you can subscribe to:
> 
>  http://www.eggheadcafe.com/articles/20030701.asp
> 
> One way to do it might be this way:
> 
> public class Log4NetHttpModule : System.Web.IHttpModule
> {
>  public Log4NetHttpModule()
>  {
> 
>  }
> 
>  public void Init(System.Web.HttpApplication context)
>  {
>   context.AuthorizeRequest += new
> EventHandler(context_AuthorizeRequest);
>  }
> 
>  private void context_AuthorizeRequest(object sender, EventArgs e)  {
>   HttpApplication context = (HttpApplication)sender;
> 
>   if (context.Request.IsAuthenticated == true)
>   {
>    log4net.MDC.Set("UserIdentityName", context.User.Identity.Name);
>   }
>   else
>   {
>    log4net.MDC.Set("UserIdentityName", "N/A");
>   }
>  }
>       
>  public void Dispose()
>  {
>                       
>  }
> 
> Make sure to add this to your web.config:
> 
> <httpModules>
>  <add type="Foo.HttpModules.Log4NetHttpModule, Foo"
> name="Log4NetHttpModule" /> </httpModules>
> 
> inside of <system.web>
> 
> Here is the conversion pattern:
> 
> "%5p %d{yyyy-MM-dd hh:mm:ss tt} (%c:%L) - [%X{UserIdentityName}]
> %m%n"
> 
> I think NLog supports things like
> ${aspnet-session:variable=MyVariableName} directly in its conversion
> patterns so you wouldn't have to mess with the HttpModule. 
> 
> - Ron
> 
> --- "Hart, Leo" <Leo.Hart@xxxxxxx> wrote:
> 
> > I have a Log4Net problem/situation that I'm sure many of you have
> come
> > across and have (hopefully) overcome.  I scoured the 'net for an
> > answer
> > but wasn't able to find exactly what I needed.
> >  
> > I'm starting to use Log4Net in my web application and I'm quite 
> > pleased with it overall.  I was a user of Log4J when I was
> programming
> 
> > J2EE apps, so obviously Log4Net is a comfortable fit.
> >  
> > I've embedded log statements throughout the various tiers of my 
> > enterprise app and it's outputting useful information to my rolling
> 
> > log file just fine.  The problem is when the app leaves my
> development
> > machine and moves to a production server with multiple users
> hitting
> > it
> > at once.  At that point it becomes very difficult to identify which
> > log
> > entries pertain to which users.  
> >  
> > So obviously I want to embed the session ID and/or the request ID
> in 
> > my log entry.  The first thing that came to mind was to simply log
> the
> > session/request IDs in the Page_Load/Page_Unload event, but that
> > doesn't
> > work because the other log entries that occur in between Page_Load
> > and
> > Page_Unload won't have that info.  
> >  
> > The next thing that came to mind was MDC/NDC.  The problem with
> that 
> > is that MDC/NDC seems to be thread-based and since a given IIS
> server
> > thread can support multiple sessions at once, the sessionID MDC can
> > be
> > overwritten.  I realized this fact once I coded the following in my
> > global.asax:
> >  
> > 
> >     Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
> >         ' Fires when the session is started
> > 
> >         log4net.MDC.Set("sessionID", Session.SessionID)
> > 
> >         m_log.Info("Session " & Session.SessionID & " is starting.")
> >     End Sub
> >     
> >     
> > 
> >     Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
> >         ' Fires when the session ends
> > 
> >         log4net.MDC.Remove("sessionID")
> > 
> >         m_log.Info("Session " & Session.SessionID & " has ended.")
> >     End Sub
> > 
> >     
> > 
> > The last approach that came to mind was making the MDC.Set/Remove 
> > calls in my ASPX page in the Page_Load/Page_Unload events, but that
> 
> > might not
> > work either given that, once again, multiple sessions are in each
> > thread.  Things would get especially confusing if I turned on
> logging
> > in
> > not only my presentation tier, but my business tier, my data tier
> and
> > any third party assemblies I'm utilizing.
> >  
> > So what do I do?  How do I solve this problem?  CAN I solve this 
> > problem?
> >  
> >  
> > Thanks for your time...
> > Leo Hart
> > 
>