hooks/metadata.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 11 Mar 2010 18:28:38 +0100
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"""Core hooks: set generic metadata
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from datetime import datetime
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from cubicweb.selectors import implements
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from cubicweb.server import hook
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def eschema_eid(session, eschema):
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    """get eid of the CWEType entity for the given yams type"""
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    # eschema.eid is None if schema has been readen from the filesystem, not
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    # from the database (eg during tests)
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    if eschema.eid is None:
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        eschema.eid = session.execute(
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            'Any X WHERE X is CWEType, X name %(name)s',
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            {'name': str(eschema)})[0][0]
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    return eschema.eid
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class MetaDataHook(hook.Hook):
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    __abstract__ = True
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    category = 'metadata'
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class InitMetaAttrsHook(MetaDataHook):
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    """before create a new entity -> set creation and modification date
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    this is a conveniency hook, you shouldn't have to disable it
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    """
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    __regid__ = 'metaattrsinit'
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    events = ('before_add_entity',)
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    def __call__(self):
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        timestamp = datetime.now()
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        self.entity.setdefault('creation_date', timestamp)
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        self.entity.setdefault('modification_date', timestamp)
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        if not self._cw.get_shared_data('do-not-insert-cwuri'):
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            cwuri = u'%seid/%s' % (self._cw.base_url(), self.entity.eid)
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            self.entity.setdefault('cwuri', cwuri)
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class UpdateMetaAttrsHook(MetaDataHook):
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    """update an entity -> set modification date"""
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    __regid__ = 'metaattrsupdate'
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    events = ('before_update_entity',)
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    def __call__(self):
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        # repairing is true during c-c upgrade/shell and similar commands. We
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        # usually don't want to update modification date in such cases.
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        #
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        # XXX to be really clean, we should turn off modification_date update
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        # explicitly on each command where we do not want that behaviour.
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        if not self._cw.vreg.config.repairing:
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            self.entity.setdefault('modification_date', datetime.now())
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class _SetCreatorOp(hook.Operation):
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    def precommit_event(self):
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        session = self.session
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        if session.deleted_in_transaction(self.entity.eid):
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            # entity have been created and deleted in the same transaction
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            return
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        if not self.entity.created_by:
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            session.add_relation(self.entity.eid, 'created_by', session.user.eid)
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class SetIsHook(MetaDataHook):
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    """create a new entity -> set is and is_instance_of relations
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    those relations are inserted using sql so they are not hookable.
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    """
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    __regid__ = 'setis'
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    events = ('after_add_entity',)
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    def __call__(self):
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        if hasattr(self.entity, '_cw_recreating'):
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            return
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        session = self._cw
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        entity = self.entity
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        try:
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            session.system_sql('INSERT INTO is_relation(eid_from,eid_to) VALUES (%s,%s)'
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                           % (entity.eid, eschema_eid(session, entity.e_schema)))
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        except IndexError:
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            # during schema serialization, skip
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            return
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        for eschema in entity.e_schema.ancestors() + [entity.e_schema]:
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            session.system_sql('INSERT INTO is_instance_of_relation(eid_from,eid_to) VALUES (%s,%s)'
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                               % (entity.eid, eschema_eid(session, eschema)))
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class SetOwnershipHook(MetaDataHook):
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    """create a new entity -> set owner and creator metadata"""
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    __regid__ = 'setowner'
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    events = ('after_add_entity',)
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    def __call__(self):
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        if not self._cw.is_internal_session:
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            self._cw.add_relation(self.entity.eid, 'owned_by', self._cw.user.eid)
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            _SetCreatorOp(self._cw, entity=self.entity)
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class _SyncOwnersOp(hook.Operation):
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    def precommit_event(self):
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        self.session.execute('SET X owned_by U WHERE C owned_by U, C eid %(c)s,'
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                             'NOT EXISTS(X owned_by U, X eid %(x)s)',
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                             {'c': self.compositeeid, 'x': self.composedeid},
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                             ('c', 'x'))
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class SyncCompositeOwner(MetaDataHook):
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    """when adding composite relation, the composed should have the same owners
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    has the composite
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    """
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    __regid__ = 'synccompositeowner'
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    events = ('after_add_relation',)
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    def __call__(self):
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        if self.rtype == 'wf_info_for':
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            # skip this special composite relation # XXX (syt) why?
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            return
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        eidfrom, eidto = self.eidfrom, self.eidto
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        composite = self._cw.schema_rproperty(self.rtype, eidfrom, eidto, 'composite')
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        if composite == 'subject':
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            _SyncOwnersOp(self._cw, compositeeid=eidfrom, composedeid=eidto)
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        elif composite == 'object':
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            _SyncOwnersOp(self._cw, compositeeid=eidto, composedeid=eidfrom)
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class FixUserOwnershipHook(MetaDataHook):
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    """when a user has been created, add owned_by relation on itself"""
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    __regid__ = 'fixuserowner'
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    __select__ = MetaDataHook.__select__ & implements('CWUser')
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    events = ('after_add_entity',)
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    def __call__(self):
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        self._cw.add_relation(self.entity.eid, 'owned_by', self.entity.eid)
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class UpdateFTIHook(MetaDataHook):
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    """sync fulltext index text index container when a relation with
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    fulltext_container set is added / removed
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    """
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    __regid__ = 'updateftirel'
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    events = ('after_add_relation', 'after_delete_relation')
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    def __call__(self):
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        rtype = self.rtype
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        session = self._cw
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        ftcontainer = session.vreg.schema.rschema(rtype).fulltext_container
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        if self.event == 'after_add_relation':
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            if ftcontainer == 'subject':
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                session.repo.system_source.index_entity(
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                    session, session.entity_from_eid(self.eidfrom))
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            elif ftcontainer == 'object':
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                session.repo.system_source.index_entity(
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                    session, session.entity_from_eid(self.eidto))
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        # after delete relation
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        elif ftcontainer == 'subject':
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            session.repo.system_source.index_entity(
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                session, entity=session.entity_from_eid(self.eidfrom))
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        elif ftcontainer == 'object':
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            session.repo.system_source.index_entity(
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                session, entity=session.entity_from_eid(self.eidto))
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