# copyright 2003-2013 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.predicates import is_instance
from cubicweb.server import hook
from cubicweb.server.edition import EditedEntity
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
if not edited.get('creation_date'):
edited['creation_date'] = timestamp
if not edited.get('modification_date'):
edited['modification_date'] = timestamp
if not self._cw.transaction_data.get('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):
cnx = self.cnx
relations = [(eid, cnx.user.eid) for eid in self.get_data()
# don't consider entities that have been created and deleted in
# the same transaction, nor ones where created_by has been
# explicitly set
if not cnx.deleted_in_transaction(eid) and \
not cnx.entity_from_eid(eid).created_by]
cnx.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():
if self.cnx.deleted_in_transaction(compositeeid):
continue
if self.cnx.deleted_in_transaction(composedeid):
continue
self.cnx.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.rtype_eids_rdef(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
cnx = self._cw
ftcontainer = cnx.vreg.schema.rschema(rtype).fulltext_container
if ftcontainer == 'subject':
cnx.repo.system_source.index_entity(
cnx, cnx.entity_from_eid(self.eidfrom))
elif ftcontainer == 'object':
cnx.repo.system_source.index_entity(
cnx, cnx.entity_from_eid(self.eidto))
# entity source handling #######################################################
class ChangeEntitySourceUpdateCaches(hook.Operation):
oldsource = newsource = entity = None # make pylint happy
def postcommit_event(self):
self.oldsource.reset_caches()
repo = self.cnx.repo
entity = self.entity
extid = entity.cw_metainformation()['extid']
repo._type_source_cache[entity.eid] = (
entity.cw_etype, None, self.newsource.uri)
repo._extid_cache[extid] = -entity.eid
class ChangeEntitySourceDeleteHook(MetaDataHook):
"""support for moving an entity from an external source by watching 'Any
cw_source CWSource' relation
"""
__regid__ = 'cw.metadata.source-change'
__select__ = MetaDataHook.__select__ & hook.match_rtype('cw_source')
events = ('before_delete_relation',)
def __call__(self):
if (self._cw.deleted_in_transaction(self.eidfrom)
or self._cw.deleted_in_transaction(self.eidto)):
return
schange = self._cw.transaction_data.setdefault('cw_source_change', {})
schange[self.eidfrom] = self.eidto
class ChangeEntitySourceAddHook(MetaDataHook):
__regid__ = 'cw.metadata.source-change'
__select__ = MetaDataHook.__select__ & hook.match_rtype('cw_source')
events = ('before_add_relation',)
def __call__(self):
schange = self._cw.transaction_data.get('cw_source_change')
if schange is not None and self.eidfrom in schange:
newsource = self._cw.entity_from_eid(self.eidto)
if newsource.name != 'system':
raise Exception('changing source to something else than the '
'system source is unsupported')
syssource = newsource.repo_source
oldsource = self._cw.entity_from_eid(schange[self.eidfrom])
entity = self._cw.entity_from_eid(self.eidfrom)
# we don't want the moved entity to be reimported later. To
# distinguish this state, the trick is to change the associated
# record in the 'entities' system table with eid=-eid while leaving
# other fields unchanged, and to add a new record with eid=eid,
# source='system'. External source will then have consider case
# where `extid2eid` return a negative eid as 'this entity was known
# but has been moved, ignore it'.
self._cw.system_sql('UPDATE entities SET eid=-eid WHERE eid=%(eid)s',
{'eid': self.eidfrom})
attrs = {'type': entity.cw_etype, 'eid': entity.eid, 'extid': None,
'asource': 'system'}
self._cw.system_sql(syssource.sqlgen.insert('entities', attrs), attrs)
# register an operation to update repository/sources caches
ChangeEntitySourceUpdateCaches(self._cw, entity=entity,
oldsource=oldsource.repo_source,
newsource=syssource)