[Zope] Handling Session Timeouts

[hans]

Chris McDonough wrote:

> When you do a RESPONSE.redirect, the rest of the page is still rendered, and
> it's not until the response is sent back to the browser that the redirect
> happens.
>
> The "missing" modifier to dtml var is useful here:
>
> <dtml-var var1 missing>
>
> ----- Original Message -----
> From: "Michael Fox" <Michael@Wodin.CenturySoftware.com.au>
> To: <zope@zope.org>
> Sent: Tuesday, June 04, 2002 8:57 PM
> Subject: [Zope] Handling Session Timeouts
>
> Hi *,
>
> In an attempt to handle session timeouts, I'm wondering if someone on this
> list can enlighten me.
>
> My application utilises Zope's Transient Object Container & Session Data
> Manager.
>
> Once a user is authenticated, I set several variables in my Session Data
> Manager with the values from a HTML form -
>
> <dtml-call "REQUEST.SESSION.set('var1', var1 )">
> <dtml-call "REQUEST.SESSION.set('var2', var2 )">
> <dtml-call "REQUEST.SESSION.set('var3', var3 )">
>
> Now these are variables are in my SDM, I set these in my
> standard_html_header as such...
>
> <dtml-call "REQUEST.set('var1',REQUEST.SESSION['var1'])">
> <dtml-call "REQUEST.set('var2',REQUEST.SESSION['var2'])">
> <dtml-call "REQUEST.set('var3',REQUEST.SESSION['var3'])">
>
> This way I can access any session variables via <dtml-var var1> rather than
> <dtml-var "REQUEST.SESSION['var1']">
>
> Am I on the right track so far?
>
> My problem is handling timeouts. My Trasient Object Container has a timeout
> value of 20 mins.
>
> In my attempt to handle timeouts, I have the following code in my
> standard_html_header -
>
> <dtml-if "REQUEST.SESSION.has_key('var1')">
>   the session still has this key, therefore must be active, do nothing.
> <dtml-else>
>   <dtml-call "RESPONSE.redirect('login_page')">
> </dtml-if>
>

http://www.zope.org/Members/datagrok/WatchThatRedirection
or put <dtml-return> after redirect

> * The rest of my HTML code goes here.
>
> The problem is the redirect isn't working and Zope attempts to render the
> page... thus resulting in a Zope error.
>
> Does anyone have a working solution to this? or could point me in the
> direction of some Docs/HOW-TO's?
>
> Any help appreciated.
>
> Regards,
> Michael