[mod_python] Session example and problems.

donnie jones donniejones18 at gmail.com
Sun Feb 27 22:21:02 EST 2005


Well, GetMailboxes is the real function, but
UseSession is the test function...

It actually seems that the sid I am returning from my GetSid function
isn't the actual sid that is in the Cookie, so each time the function is
called and I pass my sid, it must think it is a new request and create
a new session, that's the best I can figure...

So, now I am trying to figure out why I am not getting the correct
session id the same as what is in the Cookie.

__
Donnie

On Sun, 27 Feb 2005 21:58:01 -0500, Chris Jackson
<christopher.jackson at gmail.com> wrote:
> [comments inline]
> 
> On Sun, 27 Feb 2005 21:39:25 -0500, donnie jones
> <donniejones18 at gmail.com> wrote:
> > Here is the code that calls the UseSession function,
> > and it passes the sid that was from the GetSid function
> > through the javascript.
> >
> > xmlhttp=new XMLHttpRequest();
> >
> > if(xmlhttp2) {
> >   url = "mail.py/GetMailboxes?sid=" + sid;
> >   xmlhttp2.open("GET", url, true);
> > }
> >
> 
> hmm, i still don't see the UseSession function. Although I do notice
> GetMailboxes:)
> 
> > I have a sneaking suspicion that each req is
> > overriding my sess = Session(req, sid) with a new session id
> > and it may be because the XMLHttpRequest doesn't pass
> > the cookie that is generated for the session to the page,
> > and insteach with each calls it thinks a new session should
> > be created.
> >
> 
> I guess new connections via XMLHttpRequest could be happening,
> preventing cookies from being persistent as expected.  I'm not too familiar with
> XMLHttpRequest, although your req.write works and displays the correct sid,
> so the cookie must be reaching the page.
> 
> And once you have the sid, your good to go, because when using sessions,
> data is stored on the server, and the cookie just holds the sid.  you can read
> your /tmp/mp_sess* files and watch new session ids being created.
> 
> > I'm working on trying to figure more out...
> > __
> > Donnie
> >
> 
> ~= Chris =~
> 
> > On Sun, 27 Feb 2005 21:29:57 -0500, Chris Jackson
> > <christopher.jackson at gmail.com> wrote:
> > > Can you paste the line of code where you call UseSession, passing it the sid.
> > >
> > > ~= Chris =~
> > >
> > > On Sun, 27 Feb 2005 14:43:38 -0500, donnie jones
> > > <donniejones18 at gmail.com> wrote:
> > > > The javascript uses XMLHttpRequest and from the responseText is
> > > > able to get the SID and pass it to the UseSession function.
> > > >
> > > > I write out the session id in the UseSession function to make sure
> > > > that the same session id is being passed, and it works.
> > > > However, when I pass that same session id to the Session(req, sid)
> > > > it creates another session...
> > > >
> > > > __
> > > > Donnie
> > > >
> > > > On Sun, 27 Feb 2005 13:47:31 -0500, Chris Jackson
> > > > <christopher.jackson at gmail.com> wrote:
> > > > > To add to this:
> > > > >
> > > > > When UseSession, for example, is called, the parameters (req, sessid)
> > > > > get populated via the publisher handler with the values from the
> > > > > <form>.  So, since sessid is part of the form (<input type="hidden"
> > > > > name="sessid"....>), then sessid  now get's passed this hidden value
> > > > > which came from the GetSID function.  Or I could simply grab it by
> > > > > saying req.form['sessid'].
> > > > >
> > > > > ~= Chris =~
> > > > >
> > > > > On Sun, 27 Feb 2005 13:43:38 -0500, Chris Jackson
> > > > > <christopher.jackson at gmail.com> wrote:
> > > > > > So how is the session id getting form GetSID to UseSession?
> > > > > > In other words, how does the sessid go from:
> > > > > >
> > > > > > GetSID => javascript => UseSession
> > > > > >
> > > > > > req.write simply sends the output to the browser.  Does your
> > > > > > javascript somehow pick it up?  The default parameter of UseSession is
> > > > > > (req, sid="") <-blanks.  What sets this parameter?  UseSession is a
> > > > > > handler....not just some regular function.
> > > > > >
> > > > > > The way I do it:
> > > > > >
> > > > > > GetSID (...sessid = sess.id()....)  # new session =>
> > > > > > t = psp.PSP(filename = 'blah.psp') # load psp template =>
> > > > > > t.run(vars={'sessid':sessid, ...}) # pass vars dictionary to template
> > > > > > to fill in <%= %> holes =>
> > > > > > blah.psp  (<html>.......... <input type="hidden" name="sessid"
> > > > > > value="<%=sessid%>">......</html>)
> > > > > >
> > > > > > ~= Chris =~
> > > > > >
> > > > > > On Sat, 26 Feb 2005 17:33:51 -0500, donnie jones
> > > > > > <donniejones18 at gmail.com> wrote:
> > > > > > > I am not understanding part of your explanation.
> > > > > > > When I do the req.write of the sid, I can then pass it to the UseSession
> > > > > > > function, and that UseSession now gets the correct session id.
> > > > > > > I req.write the session id in the UseSession function and it is the
> > > > > > > same as the session id from the GetSID function....
> > > > > > >
> > > > > > > Are you saying that the session itself is lost without saving the sesion
> > > > > > > id in the <input hidden>  ?  I am confused why passing the session id
> > > > > > > to the Session(req, sid) shouldn't keep the same session...
> > > > > > >
> > > > > > > Thanks.
> > > > > > >
> > > > > > > __
> > > > > > > Donnie
> > > > > > >
> > > > > > >
> > > > > > > On Fri, 25 Feb 2005 16:31:43 -0500, Chris Jackson
> > > > > > > <christopher.jackson at gmail.com> wrote:
> > > > > > > > This is not quite the same as in the example in the URL.
> > > > > > > >
> > > > > > > > The example in the URL passes the sessid to an <input hidden...> field
> > > > > > > > via PSP templates.  And when a function like (def UseSession) is
> > > > > > > > called, req.form['sessid'] stores the value from this hidden field.
> > > > > > > > That's how the sessid is passed.
> > > > > > > >
> > > > > > > > In your GetSid function, you simply say req.write, which doesn't
> > > > > > > > really do anything but display it, vs. <input hidden...> which
> > > > > > > > captures the sessid to be used later.  After GetSid ends, your session
> > > > > > > > id is lost.
> > > > > > > >
> > > > > > > > ~= Chris =~
> > > > > > > >
> > > > > > > >
> > > > > > > > On Fri, 25 Feb 2005 14:53:28 -0500, donnie jones
> > > > > > > > <donniejones18 at gmail.com> wrote:
> > > > > > > > > def GetSid(req, sid=""):
> > > > > > > > >   sess = Session(req);
> > > > > > > > >   if sess.is_new():
> > > > > > > > >     sess['u']="user";
> > > > > > > > >     sess['p']="password";
> > > > > > > > >     sid = sess.id();
> > > > > > > > >     sess.save;
> > > > > > > > >   else:
> > > > > > > > >     sid = sess.id();
> > > > > > > > >   req.write("%s" % sid);
> > > > > > > > >   return;
> > > > > > > > >
> > > > > > > > > # list mailboxes
> > > > > > > > > def UseSession(req, sid=""):
> > > > > > > > >   req.write("%s" % sid);
> > > > > > > > >   sess = Session(req, sid, None, 1800, 0);
> > > > > > > > >   if sess.is_new():
> > > > > > > > >     req.write("<br/>session new<br/>");
> > > > > > > > >     sid = sess.id();
> > > > > > > > >   else:
> > > > > > > > >     sess.load();
> > > > > > > > >   req.write("%s" % sid);
> > > > > > > > >
> > > > > > > > > I first call the GetSid from my javascript and I am using
> > > > > > > > > XmlHttpRequest that gets the sid from the responseText.
> > > > > > > > > Then I call UseSession function with the sid passed to it
> > > > > > > > > through the javascript, and I print the sid to make sure the
> > > > > > > > > correct id was passed and that works, but after the Session()
> > > > > > > > > is ran it always creates a new session,
> > > > > > > > > I am not sure why... I used this link
> > > > > > > > > http://www.modpython.org/pipermail/mod_python/2005-January/017111.html
> > > > > > > > > as an example to follow...
> > > > > > > > >
> > > > > > > > > Any ideas?
> > > > > > > > > Thanks.
> > > > > > > > >
> > > > > > > > > __
> > > > > > > > > Donnie
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On Thu, 24 Feb 2005 15:36:43 -0600, Shawn Harrison <harrison at tbc.net> wrote:
> > > > > > > > > > donnie jones wrote [02/24/05 2:55 PM]:
> > > > > > > > > > > Hello,
> > > > > > > > > > >
> > > > > > > > > > > Could someone please give me an example of using the Session()
> > > > > > > > > > > in modpython for passing data between functions?
> > > > > > > > > > > I have been googling, but with no success..
> > > > > > > > > > >
> > > > > > > > > > > The problem I am having is that each time I reload a page that calls
> > > > > > > > > > > the function like below, it creates a new session.
> > > > > > > > > > >
> > > > > > > > > > > def test(req):
> > > > > > > > > > >   sess = Sess(req);
> > > > > > > > > > >   sid = sess.id();
> > > > > > > > > > >   if sess.is_new():
> > > > > > > > > > >     req.write("new session %s" % sid);
> > > > > > > > > > >   else:
> > > > > > > > > > >     sess.load();
> > > > > > > > > > >     req.write("%s" % sess['username']);
> > > > > > > > > > >
> > > > > > > > > > > I am printing the session id and each time the function is loaded
> > > > > > > > > > > I get a new session id, thus I cannot store data in the session
> > > > > > > > > > > to use in other functions...
> > > > > > > > > >
> > > > > > > > > > class BaseSession(req[, sid, secret, timeout, lock, lockfile])
> > > > > > > > > > ..
> > > > > > > > > >      save()
> > > > > > > > > >          This method writes session values to storage.
> > > > > > > > > >
> > > > > > > > > > It doesn't appear that you are doing this. It only writes the data when
> > > > > > > > > > you tell it to.
> > > > > > > > > >
> > > > > > > > > > Shawn Harrison
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