[form fields] fix severe memory leak due to @cached on field.input_name
occuring on forms with persistent fields. Has been triggered in 3.6.1 on
our public sites because:
* the login form use persistent field since 3.6
* it's displayed on every anonymous request
* another bug (fixed during the latest mini-sprint) made it also displayed
for authenticated user
see explanation in code for more detail.
moral: be very careful with @cached...
"""
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
from AccessControl import getSecurityManager
from cubicweb.dbapi import connect, Connection, Cursor
from cubicweb.common.utils import ResultSet, ResultSetIterator, ResultSetRow, Entity
Connection.__allow_access_to_unprotected_subobjects__ = 1
Cursor.__allow_access_to_unprotected_subobjects__ = 1
ResultSet.__allow_access_to_unprotected_subobjects__ = 1
ResultSetIterator.__allow_access_to_unprotected_subobjects__ = 1
ResultSetRow.__allow_access_to_unprotected_subobjects__ = 1
Entity.__allow_access_to_unprotected_subobjects__ = 1
CNX_CACHE = {}
def get_connection(context, user=None, password=None,
host=None, database=None, group='cubicweb'):
"""get a connection on an cubicweb server"""
request = context.REQUEST
zope_user = getSecurityManager().getUser()
if user is None:
user = zope_user.getId()
key = (user, host, database)
try:
return CNX_CACHE[key]
except KeyError:
if password is None:
password = zope_user._getPassword()
cnx = connect(user, password, host, database, group)
CNX_CACHE[key] = cnx
return cnx