rh is the parent's request handler (usually self).
This is the whole script:
import random
import pickle
from google.appengine.api import memcache
_sidChars='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
_defaultTimeout=30*60 # 30 min
_defaultCookieName='gsid'
#----------------------------------------------------------------------
class Session(dict):
"""A secure lightweight memcache-backed session Class for Google
Appengine."""
#----------------------------------------------------------
def
__init__(self,rh,name=_defaultCookieName,timeout=_defaultTimeout):
"""Create a session object.
Keyword arguments:
rh -- the parent's request handler (usually self)
name -- the cookie name (defaults to "gsid")
timeout -- the number of seconds the session will last between
requests (defaults to 1800 secs - 30 minutes)
"""
self.rh=rh # request handler
self._timeout=timeout
self._name=name
self._new=True
self._invalid=False
dict.__init__(self)
if name in rh.request.cookies:
self._sid=rh.request.cookies[name]
data=memcache.get(self._sid)
if data:
self.update(pickle.loads(data))
# memcache timeout is absolute, so we need to
reset it on each
access
memcache.set(self._sid,data,self._timeout)
self._new=False
return
# Create a new session ID
# There are about 10^14 combinations, so guessing won't work
self._sid=random.choice(_sidChars)+random.choice(_sidChars)+\
random.choice(_sidChars)+random.choice(_sidChars)+\
random.choice(_sidChars)+random.choice(_sidChars)+\
random.choice(_sidChars)+random.choice(_sidChars)
rh.response.headers.add_header('Set-Cookie','%s=%s;'%
(name,self._sid))
#----------------------------------------------------------
def save(self):
"""Save session data."""
if not self._invalid:
memcache.set(self._sid,pickle.dumps(self.copy()),self._timeout)
#----------------------------------------------------------
def is_new(self):
"""Returns True if session was created during this request."""
return self._new
#----------------------------------------------------------
def invalidate(self):
"""Delete session data and cookie."""
self.rh.response.headers.add_header('Set-Cookie',
'%s=; expires=Sat, 1-Jan-2000 00:00:00
GMT;'%(self._name))
memcache.delete(self._sid)
self.clear()
self._invalid=True
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