add a new method iter_process_result which does the same as proces_result but is a generator (closes #1625374)
process_result is reimplemented using the new method, and the two helper
methods are turned into generators.
These generators use cursor.fetchmany instead of cursor.fetchall after setting
cursor.arraysize to 100. This means that the whole result set should never
loaded in memory when using the iter_process_result method. This is used in the
"portable" database dump implementation when we typically to 'SELECT * FROM
table', but could probably be used too in other parts of cubicweb.
# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""Core hooks: set generic metadata"""
__docformat__ = "restructuredtext en"
from datetime import datetime
from cubicweb.selectors import is_instance
from cubicweb.server import hook
class MetaDataHook(hook.Hook):
__abstract__ = True
category = 'metadata'
class InitMetaAttrsHook(MetaDataHook):
"""before create a new entity -> set creation and modification date
this is a conveniency hook, you shouldn't have to disable it
"""
__regid__ = 'metaattrsinit'
events = ('before_add_entity',)
def __call__(self):
timestamp = datetime.now()
edited = self.entity.cw_edited
edited.setdefault('creation_date', timestamp)
edited.setdefault('modification_date', timestamp)
if not self._cw.get_shared_data('do-not-insert-cwuri'):
cwuri = u'%s%s' % (self._cw.base_url(), self.entity.eid)
edited.setdefault('cwuri', cwuri)
class UpdateMetaAttrsHook(MetaDataHook):
"""update an entity -> set modification date"""
__regid__ = 'metaattrsupdate'
events = ('before_update_entity',)
def __call__(self):
# repairing is true during c-c upgrade/shell and similar commands. We
# usually don't want to update modification date in such cases.
#
# XXX to be really clean, we should turn off modification_date update
# explicitly on each command where we do not want that behaviour.
if not self._cw.vreg.config.repairing:
self.entity.cw_edited.setdefault('modification_date', datetime.now())
class SetCreatorOp(hook.DataOperationMixIn, hook.Operation):
def precommit_event(self):
session = self.session
relations = [(eid, session.user.eid) for eid in self.get_data()
# don't consider entities that have been created and
# deleted in the same transaction
if not session.deleted_in_transaction(eid) and \
not session.entity_from_eid(eid).created_by]
session.add_relations([('created_by', relations)])
class SetOwnershipHook(MetaDataHook):
"""create a new entity -> set owner and creator metadata"""
__regid__ = 'setowner'
events = ('after_add_entity',)
def __call__(self):
if not self._cw.is_internal_session:
self._cw.add_relation(self.entity.eid, 'owned_by', self._cw.user.eid)
SetCreatorOp.get_instance(self._cw).add_data(self.entity.eid)
class SyncOwnersOp(hook.DataOperationMixIn, hook.Operation):
def precommit_event(self):
for compositeeid, composedeid in self.get_data():
self.session.execute('SET X owned_by U WHERE C owned_by U, C eid %(c)s,'
'NOT EXISTS(X owned_by U, X eid %(x)s)',
{'c': compositeeid, 'x': composedeid})
class SyncCompositeOwner(MetaDataHook):
"""when adding composite relation, the composed should have the same owners
has the composite
"""
__regid__ = 'synccompositeowner'
events = ('after_add_relation',)
def __call__(self):
if self.rtype == 'wf_info_for':
# skip this special composite relation # XXX (syt) why?
return
eidfrom, eidto = self.eidfrom, self.eidto
composite = self._cw.schema_rproperty(self.rtype, eidfrom, eidto, 'composite')
if composite == 'subject':
SyncOwnersOp.get_instance(self._cw).add_data( (eidfrom, eidto) )
elif composite == 'object':
SyncOwnersOp.get_instance(self._cw).add_data( (eidto, eidfrom) )
class FixUserOwnershipHook(MetaDataHook):
"""when a user has been created, add owned_by relation on itself"""
__regid__ = 'fixuserowner'
__select__ = MetaDataHook.__select__ & is_instance('CWUser')
events = ('after_add_entity',)
def __call__(self):
self._cw.add_relation(self.entity.eid, 'owned_by', self.entity.eid)
class UpdateFTIHook(MetaDataHook):
"""sync fulltext index text index container when a relation with
fulltext_container set is added / removed
"""
__regid__ = 'updateftirel'
events = ('after_add_relation', 'after_delete_relation')
def __call__(self):
rtype = self.rtype
session = self._cw
ftcontainer = session.vreg.schema.rschema(rtype).fulltext_container
if ftcontainer == 'subject':
session.repo.system_source.index_entity(
session, session.entity_from_eid(self.eidfrom))
elif ftcontainer == 'object':
session.repo.system_source.index_entity(
session, session.entity_from_eid(self.eidto))