2010/3/12 Branko Vukelic <[email protected]>
> I think you can't really pinpoint the session timeout by any means
> other than checking it in a constantly-running background process per
> session (I think that'd be expensive), or per request.
>
I analyzed session.py and it is already checking if session alive (or
timeout) so it is not necessary to check in my app.
In session.py Session class checks in *_clean()* function whether session
alive, if not it calls Store Object's *cleanup()* function and detects all
sessions which are not alive then delete them.
In my app i am saving sessions on disk (not db) and i have a table which
holds users login status, so i need update my table when users session
timeout (actually not "timeout", i am doing this at first request after
session timeout, it is ok for me, i have always fresh login status ), i
could do this in my app in different ways but i wanted to do this inside
web.py and did some hacking to achive this.
Here is step by step what i did:
*In my application
*I added a parameter to web.config session_parameters called *
before_session_delete*, this parameter takes a function name which will be
run from session.py Store object
*web.config.session_parameters['before_session_delete'] =
my_before_session_delete_function
*Then i defined that function in my app
*def my_before_session_delete_function( session_data )*:
*#do whatever you want
**In session.py* (changings are bold)
web.config.session_parameters = utils.storage({
'cookie_name': 'webpy_session_id',
'cookie_domain': None,
'timeout': 86400, #24 * 60 * 60, # 24 hours in seconds
'ignore_expiry': True,
'ignore_change_ip': True,
'secret_key': 'fLjUfxqXtfNoIldA0A0J',
'expired_message': 'Session expired',
* 'before_session_delete': None*
})
#############################################################
class Session(utils.ThreadedDict):
"""Session management for web.py
"""
def __init__(self, app, store, initializer=None):
self.__dict__['store'] = store
self.__dict__['_initializer'] = initializer
self.__dict__['_last_cleanup_time'] = 0
self.__dict__['_config'] =
utils.storage(web.config.session_parameters)
* if self._config.before_session_delete:
self.store.set_before_session_delete(self._config.before_session_delete)*
if app:
app.add_processor(self._processor)
#######################################################################
class DiskStore(Store):
def __init__(self, root):
# if the storage root doesn't exists, create it.
if not os.path.exists(root):
os.mkdir(root)
self.root = root
* self.before_session_delete = None
def set_before_session_delete(self, func):
self.before_session_delete = func*
def cleanup(self, timeout):
now = time.time()
for f in os.listdir(self.root):
path = self._get_path(f)
atime = os.stat(path).st_atime
print "path = ", path
if now - atime > timeout :
* if self.before_session_delete:
try:
self.before_session_delete(self.__getitem__(os.path.basename(path)))
except ValueError, e:
pass*
os.remove(path)
I had what i want, on before each session delete my function runs and i can
do whatever i want with session data before deleted.
I finished just now, as i tested it works, feel free to debug&modify it.
--
Aydın ŞEN
Ege Üniversitesi
Uluslararası Bilgisayar Enstitüsü
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