goa/appobjects/sessions.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 27 May 2009 16:41:15 +0200
branchstable
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child 1977 606923dff11b
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components should be visible by default, applmessages components should not be hideable
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"""persistent sessions stored in big table
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:organization: Logilab
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:copyright: 2008-2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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XXX TODO:
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* cleanup persistent session
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* use user as ancestor?
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"""
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__docformat__ = "restructuredtext en"
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from pickle import loads, dumps
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from time import localtime, strftime
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from logilab.common.decorators import cached, clear_cache
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from cubicweb import BadConnectionId
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from cubicweb.dbapi import Connection, ConnectionProperties, repo_connect
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from cubicweb.selectors import none_rset, match_user_groups
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from cubicweb.server.session import Session
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from cubicweb.web import InvalidSession
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from cubicweb.web.application import AbstractSessionManager
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from cubicweb.web.application import AbstractAuthenticationManager
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from google.appengine.api.datastore import Key, Entity, Get, Put, Delete, Query
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from google.appengine.api.datastore_errors import EntityNotFoundError
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from google.appengine.api.datastore_types import Blob
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try:
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    del Connection.__del__
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except AttributeError:
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    pass # already deleted
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class GAEAuthenticationManager(AbstractAuthenticationManager):
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    """authenticate user associated to a request and check session validity,
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    using google authentication service
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    """
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    def __init__(self, *args, **kwargs):
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        super(GAEAuthenticationManager, self).__init__(*args, **kwargs)
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        self._repo = self.config.repository(vreg=self.vreg)
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    def authenticate(self, req, _login=None, _password=None):
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        """authenticate user and return an established connection for this user
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        :raise ExplicitLogin: if authentication is required (no authentication
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        info found or wrong user/password)
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        """
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        if _login is not None:
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            login, password = _login, _password
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        else:
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            login, password = req.get_authorization()
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        # remove possibly cached cursor coming from closed connection
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        clear_cache(req, 'cursor')
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        cnxprops = ConnectionProperties(self.vreg.config.repo_method,
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                                        close=False, log=False)
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        cnx = repo_connect(self._repo, login, password, cnxprops=cnxprops)
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        self._init_cnx(cnx, login, password)
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        # associate the connection to the current request
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        req.set_connection(cnx)
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        return cnx
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    def _init_cnx(self, cnx, login, password):
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        cnx.anonymous_connection = self.config.is_anonymous_user(login)
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        cnx.vreg = self.vreg
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        cnx.login = login
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        cnx.password = password
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class GAEPersistentSessionManager(AbstractSessionManager):
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    """manage session data associated to a session identifier"""
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    def __init__(self, *args, **kwargs):
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        super(GAEPersistentSessionManager, self).__init__(*args, **kwargs)
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        self._repo = self.config.repository(vreg=self.vreg)
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    def get_session(self, req, sessionid):
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        """return existing session for the given session identifier"""
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        # search a record for the given session
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        key = Key.from_path('CubicWebSession', 'key_' + sessionid, parent=None)
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        try:
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            record = Get(key)
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        except EntityNotFoundError:
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            raise InvalidSession()
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        repo = self._repo
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        if self.has_expired(record):
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            repo._sessions.pop(sessionid, None)
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            Delete(record)
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            raise InvalidSession()
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        # associate it with a repository session
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        try:
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            reposession = repo._get_session(sessionid)
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            user = reposession.user
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            # touch session to avoid closing our own session when sessions are
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            # cleaned (touch is done on commit/rollback on the server side, too
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            # late in that case)
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            reposession._touch()
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        except BadConnectionId:
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            # can't found session in the repository, this probably mean the
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            # session is not yet initialized on this server, hijack the repo
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            # to create it
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            # use an internal connection
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            ssession = repo.internal_session()
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            # try to get a user object
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            try:
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                user = repo.authenticate_user(ssession, record['login'],
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                                              record['password'])
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            finally:
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                ssession.close()
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            reposession = Session(user, self._repo, _id=sessionid)
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            self._repo._sessions[sessionid] = reposession
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        cnx = Connection(self._repo, sessionid)
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        return self._get_proxy(req, record, cnx, user)
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    def open_session(self, req):
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        """open and return a new session for the given request"""
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        cnx = self.authmanager.authenticate(req)
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        # avoid rebuilding a user
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        user = self._repo._get_session(cnx.sessionid).user
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        # build persistent record for session data
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        record = Entity('CubicWebSession', name='key_' + cnx.sessionid)
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        record['login'] = cnx.login
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        record['password'] = cnx.password
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        record['anonymous_connection'] = cnx.anonymous_connection
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        Put(record)
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        return self._get_proxy(req, record, cnx, user)
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0
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    def close_session(self, proxy):
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        """close session on logout or on invalid session detected (expired out,
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        corrupted...)
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        """
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        proxy.close()
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    def current_sessions(self):
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        for record in Query('CubicWebSession').Run():
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            yield ConnectionProxy(record)
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0
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    def _get_proxy(self, req, record, cnx, user):
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        proxy = ConnectionProxy(record, cnx, user)
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        user.req = req
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        req.set_connection(proxy, user)
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        return proxy
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class ConnectionProxy(object):
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0
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    def __init__(self, record, cnx=None, user=None):
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        self.__record = record
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        self.__cnx = cnx
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        self.__user = user
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        self.__data = None
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        self.__is_dirty = False
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        self.sessionid = record.key().name()[4:] # remove 'key_' prefix
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0
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    def __repr__(self):
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        sstr = '<ConnectionProxy %s' % self.sessionid
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   159
        if self.anonymous_connection:
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            sstr += ' (anonymous)'
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        elif self.__user:
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            sstr += ' for %s' % self.__user.login
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        sstr += ', last used %s>' % strftime('%T', localtime(self.last_usage_time))
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        return sstr
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0
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    def __getattribute__(self, name):
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        try:
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            return super(ConnectionProxy, self).__getattribute__(name)
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        except AttributeError:
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            return getattr(self.__cnx, name)
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    def _set_last_usage_time(self, value):
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   173
        self.__is_dirty = True
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   174
        self.__record['last_usage_time'] = value
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    def _get_last_usage_time(self):
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        return self.__record['last_usage_time']
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0
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    last_usage_time = property(_get_last_usage_time, _set_last_usage_time)
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    @property
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    def anonymous_connection(self):
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   182
        # use get() for bw compat if sessions without anonymous information are
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        # found. Set default to True to limit lifetime of those sessions.
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   184
        return self.__record.get('anonymous_connection', True)
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0
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   186
    @property
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    @cached
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    def data(self):
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   189
        if self.__record.get('data') is not None:
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            try:
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   191
                return loads(self.__record['data'])
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            except:
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   193
                self.__is_dirty = True
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   194
                self.exception('corrupted session data for session %s',
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   195
                               self.__cnx)
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   196
        return {}
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0
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   198
    def get_session_data(self, key, default=None, pop=False):
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   199
        """return value associated to `key` in session data"""
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   200
        if pop:
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   201
            try:
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   202
                value = self.data.pop(key)
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   203
                self.__is_dirty = True
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                return value
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   205
            except KeyError:
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   206
                return default
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   207
        else:
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   208
            return self.data.get(key, default)
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0
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    def set_session_data(self, key, value):
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   211
        """set value associated to `key` in session data"""
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   212
        self.data[key] = value
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   213
        self.__is_dirty = True
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   214
0
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   215
    def del_session_data(self, key):
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   216
        """remove value associated to `key` in session data"""
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   217
        try:
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   218
            del self.data[key]
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   219
            self.__is_dirty = True
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   220
        except KeyError:
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            pass
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0
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   223
    def commit(self):
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   224
        if self.__is_dirty:
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   225
            self.__save()
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   226
        self.__cnx.commit()
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   227
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   228
    def rollback(self):
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   229
        self.__save()
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   230
        self.__cnx.rollback()
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   231
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   232
    def close(self):
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   233
        if self.__cnx is not None:
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   234
            self.__cnx.close()
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   235
        Delete(self.__record)
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diff changeset
   236
0
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   237
    def __save(self):
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   238
        if self.__is_dirty:
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diff changeset
   239
            self.__record['data'] = Blob(dumps(self.data))
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   240
            Put(self.__record)
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   241
            self.__is_dirty = False
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   242
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   243
    def user(self, req=None, props=None):
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   244
        """return the User object associated to this connection"""
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   245
        return self.__user
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   246
0
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   247
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   248
import logging
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   249
from cubicweb import set_log_methods
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   250
set_log_methods(ConnectionProxy, logging.getLogger('cubicweb.web.goa.session'))
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   251
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   252
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   253
from cubicweb.common.view import StartupView
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   254
from cubicweb.web import application
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   255
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   256
class SessionsCleaner(StartupView):
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    id = 'cleansessions'
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   258
    __select__ = none_rset() & match_user_groups('managers')
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0
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   260
    def call(self):
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   261
        # clean web session
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   262
        session_manager = application.SESSION_MANAGER
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   263
        nbclosed, remaining = session_manager.clean_sessions()
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   264
        self.w(u'<div class="message">')
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        self.w(u'%s web sessions closed<br/>\n' % nbclosed)
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        # clean repository sessions
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        repo = self.config.repository(vreg=self.vreg)
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        nbclosed = repo.clean_sessions()
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        self.w(u'%s repository sessions closed<br/>\n' % nbclosed)
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        self.w(u'%s remaining sessions<br/>\n' % remaining)
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        self.w(u'</div>')
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1802
d628defebc17 delete-trailing-whitespace + some copyright update
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def registration_callback(vreg):
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    vreg.register(SessionsCleaner)
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    vreg.register(GAEAuthenticationManager, clear=True)
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    vreg.register(GAEPersistentSessionManager, clear=True)