I would like this to be included in webpy. Very good improvement. On Jan 25, 7:34 am, Ben Corneau <[email protected]> wrote: > have had similar thoughts about sessions. Sessions are all or > nothing even if you only want them some of the time. However, instead > of complicating the session interface I think it would be much cleaner > to have web.py defer loading sessions until a session variable is > accessed. I cracked open session.py and with a few minor tweaks I was > able to get the simple cookbook > examplehttp://webpy.org/cookbook/sessionsworking running the built in web > server. This was just a quick hack so there may be some glaring > oversight to why this is a bad idea that I have missed. > > Basically, Instead of loading sessions in processor(), the sessions > are loaded the first time __getattr__ is called. > > file:sessions.py > ------------------------------------ > def __getattr__(self, key): > self._lazy_load() > return utils.ThreadedDict.__getattr__(self, key) > > def _processor(self, handler): > """Application processor to setup session for every request""" > #self._cleanup() > #self._load() > > try: > return handler() > finally: > if self._session_loaded(): > self._save() > > def _session_loaded(self): > try: > utils.ThreadedDict.__getattr__(self, "session_id") > return True > except AttributeError: > return False > > def _lazy_load(self): > if not self._session_loaded(): > self._cleanup() > self._load() > > > > On Thu, Jan 20, 2011 at 6:36 AM, Franck <[email protected]> wrote: > > Dear all, > > > When you enable sessions in web.py, the default behavior of the framework is > > to load/save the session into the store (e.g. a "sessions" table) at each > > request. > > > Suppose you want a session management per request : i.e, some requests > > should be associated with the session, some other should not (for > > performance matters, for instance) > > > Here's a sample recipe : let me know what you think ! > >http://pastebin.com/Stn9uKvH > > > Thanks ! > > Franck > > > """ > > Per-request session management > > (web.py recipe) > > """ > > > import web > > > def init_session(): > > """ Initializes the session at a global level (web.config._session) """ > > > if web.config.get('_session') is None: > > db = web.database(dbn='sqlite', db='path_to_your_database') > > store = web.session.DBStore(db, 'sessions') > > # When building a Session, we must make sure that app is None, > > otherwise an application processor will be set up. > > # Such a global processor would load / save the session for every > > request, no matter what. > > web.config._session = web.session.Session(app = None, store = store, > > initializer = {'count': 0}) > > > def get_session(): > > """ Returns the global session (web.config._session) """ > > return web.config._session > > > def _load_session(): > > """ Cleans up the session and loads it from the store, by the id from > > cookie """ > > session = get_session() > > session._cleanup() > > session._load() > > > def _save_session(): > > """ Saves the session into the store """ > > get_session()._save() > > > def enable_sessions(func): > > """ Wraps a controller method (GET/POST) in order to handle session > > management on a per-request basis """ > > > def wrapped_func(*args): > > _load_session() > > try : > > return func(*args) > > finally: > > _save_session() > > > return wrapped_func > > > class hello: > > """ Sample controller with a session-enabled GET method : see > >http://localhost:8080/"""; > > > @enable_sessions > > def GET(self): > > > # get_session() may be freely called since GET is properly decorated > > session = get_session() > > print 'session', session > > > # Also, the session may be freely modified > > session.count += 1 > > > return 'Hello ! Sessions are enabled : count = %d.' % session.count > > > class anonymous: > > """ Sample controller with a session-disabled GET method : see > >http://localhost:8080/anonymous"""; > > > def GET(self): > > > # get_session() may not be called here ; actually, if called, the > > method will return an empty Storage > > return 'Hello ! Sessions are disabled.' > > > # Defines the URLs > > urls = ( > > '/', 'hello', > > '/anonymous', 'anonymous' > > ) > > > # Inits the web application > > app = web.application(urls, globals()) > > > # Initializes the session > > init_session() > > > if __name__ == '__main__': > > > # Runs the web application > > app.run() > > > -- > > You received this message because you are subscribed to the Google Groups > > "web.py" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group at > >http://groups.google.com/group/webpy?hl=en.
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