118 lines
3.4 KiB
Python
118 lines
3.4 KiB
Python
#
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# Copyright (c) 2010 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Store session data in memcached.
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$Id$
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"""
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from zope.app.session.interfaces import IClientId, ISession
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from zope.app.session.interfaces import ISessionDataContainer
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from zope.app.session.interfaces import ISessionPkgData, ISessionData
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from zope import component
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from zope.component import getUtility, adapts
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from zope.component.interfaces import ComponentLookupError
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from zope.interface import implements
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from zope.publisher.interfaces import IRequest
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from lovely.memcached.interfaces import IMemcachedClient
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class SessionDataContainer(object):
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implements(ISessionDataContainer)
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lifetime = 24 * 3600
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namespace = 'cybertools.session'
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def __getitem__(self, key):
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client = component.getUtility(IMemcachedClient)
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value = client.query(key, ns=self.namespace)
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if value:
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value.parent = self
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return value
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def __setitem__(self, key, value):
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client = component.getUtility(IMemcachedClient)
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oldValue = client.query(key, ns=self.namespace)
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if oldValue:
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oldValue.update(value)
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newValue = oldValue
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else:
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newValue = value
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client.set(newValue, key, lifetime=self.lifetime, ns=self.namespace)
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class Session(object):
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implements(ISession)
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adapts(IRequest)
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packageName = 'cybertools.session.memcached'
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def __init__(self, request):
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self.client_id = str(IClientId(request))
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def __getitem__(self, pkg_id):
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sdc = getUtility(ISessionDataContainer, name=self.packageName)
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sd = sdc[self.client_id]
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if sd is None:
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sd = sdc[self.client_id] = SessionData(self.client_id, sdc)
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try:
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return sd[pkg_id]
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except KeyError:
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spd = sd[pkg_id] = SessionPkgData(pkg_id, sd)
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return spd
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class SessionData(dict):
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implements(ISessionData)
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def __init__(self, id, parent):
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self.id = id
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self.parent = parent
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def __getitem__(self, key):
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value = super(SessionData, self).__getitem__(key)
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if isinstance(value, SessionPkgData):
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value.parent = self
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return value
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def __setitem__(self, key, value):
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super(SessionData, self).__setitem__(key, value)
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self.parent[self.id] = self
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def setdefault(self, key, default):
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try:
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return self[key]
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except KeyError:
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self[key] = default
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return default
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def clear(self):
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super(SessionData, self).clear()
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self.parent[self.id] = self
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class SessionPkgData(SessionData):
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implements(ISessionPkgData)
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def __getitem__(self, key):
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return super(SessionPkgData, self).__getitem__(key)
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