[mod_python] Can you run a process when a session expires

Hello,

I was wondering if it is possible to run a process when a session timeout 
expires. I wouldn't believe there is, for there would need to be some process 
constantly monitoring all the processes for expiration, and immediately run 
the program. But I figured I would ask.

So to try to do this, I figured I would write another process that would 
monitor that session database. Basically, open and read the 
'/tmp/mp_session.dbm' run through all the sessions, and if expired run the 
program I would like to run. The default db for mp_sess.dbm is dbhash. I have 
never worked with dbhash before, I have worked with gdbm. I tried looking at 
what is contained within the dbhash file, and I wasn't too sure how to parse 
the information under the sid keys.

So I thought I would see how a mp_sess.dbm file would be created if I 
specified using gdbm, I used the following lines:
import gdbm
sess=Session.DbmSession(req, None, None, gdbm)

But I get the following error:
Mod_python error: "PythonHandler mod_python.publisher"

Traceback (most recent call last):

  File "/usr/lib/python2.3/site-packages/mod_python/apache.py", line 299, in 
HandlerDispatch
    result = object(req)

  File "/usr/lib/python2.3/site-packages/mod_python/publisher.py", line 136, 
in handler
    result = util.apply_fs_data(object, req.form, req=req)

  File "/usr/lib/python2.3/site-packages/mod_python/util.py", line 361, in 
apply_fs_data
    return object(**args)

  File "/var/www/localhost/htdocs/python/inet.py", line 11, in login
    webtools.login(req, Secret, args)

  File "/var/www/localhost/htdocs/python/webtools.py", line 23, in login
    sess=Session.DbmSession(req, None, Secret, gdbm)

  File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 294, in 
__init__
    timeout=timeout, lock=lock)

  File "/usr/lib/python2.3/site-packages/mod_python/Session.py", line 132, in 
__init__
    Cookie.add_cookie(self._req, self.make_cookie())

  File "/usr/lib/python2.3/site-packages/mod_python/Cookie.py", line 353, in 
add_cookie
    req.headers_out.add("Set-Cookie", str(cookie))

  File "/usr/lib/python2.3/site-packages/mod_python/Cookie.py", line 204, in 
__str__
    result = ["%s=%s%s" % (self.name, self.hexdigest(self.value),

  File "/usr/lib/python2.3/site-packages/mod_python/Cookie.py", line 198, in 
hexdigest
    _hmac = hmac.new(self.__data__["secret"], self.name)

  File "/usr/lib/python2.3/hmac.py", line 97, in new
    return HMAC(key, msg, digestmod)

  File "/usr/lib/python2.3/hmac.py", line 41, in __init__
    if len(key) > blocksize:

TypeError: len() of unsized object


Any ideas or suggestions ?
Thanks,
  Steven