hooks/integrity.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 14 Aug 2009 14:31:25 +0200
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use ._cw instead of .cw_req
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"""Core hooks: check for data integrity according to the instance'schema
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validity
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:organization: Logilab
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:copyright: 2001-2009 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 cubicweb import ValidationError
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from cubicweb.selectors import entity_implements
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from cubicweb.common.uilib import soup2xhtml
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from cubicweb.server import hook
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from cubicweb.server.pool import LateOperation, PreCommitOperation
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# special relations that don't have to be checked for integrity, usually
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# because they are handled internally by hooks (so we trust ourselves)
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DONT_CHECK_RTYPES_ON_ADD = set(('owned_by', 'created_by',
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                                'is', 'is_instance_of',
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                                'wf_info_for', 'from_state', 'to_state'))
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DONT_CHECK_RTYPES_ON_DEL = set(('is', 'is_instance_of',
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                                'wf_info_for', 'from_state', 'to_state'))
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class _CheckRequiredRelationOperation(hook.LateOperation):
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    """checking relation cardinality has to be done after commit in
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    case the relation is being replaced
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    """
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    eid, rtype = None, None
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    def precommit_event(self):
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        # recheck pending eids
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        if self.session.deleted_in_transaction(self.eid):
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            return
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        if self.session.unsafe_execute(*self._rql()).rowcount < 1:
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            etype = self.session.describe(self.eid)[0]
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            _ = self.session._
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            msg = _('at least one relation %(rtype)s is required on %(etype)s (%(eid)s)')
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            msg %= {'rtype': _(self.rtype), 'etype': _(etype), 'eid': self.eid}
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            raise ValidationError(self.eid, {self.rtype: msg})
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    def commit_event(self):
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        pass
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    def _rql(self):
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        raise NotImplementedError()
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class _CheckSRelationOp(_CheckRequiredRelationOperation):
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    """check required subject relation"""
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    def _rql(self):
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        return 'Any O WHERE S eid %%(x)s, S %s O' % self.rtype, {'x': self.eid}, 'x'
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class _CheckORelationOp(_CheckRequiredRelationOperation):
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    """check required object relation"""
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    def _rql(self):
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        return 'Any S WHERE O eid %%(x)s, S %s O' % self.rtype, {'x': self.eid}, 'x'
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class IntegrityHook(hook.Hook):
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    __abstract__ = True
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    category = 'integrity'
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class CheckCardinalityHook(IntegrityHook):
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    """check cardinalities are satisfied"""
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    __id__ = 'checkcard'
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    events = ('after_add_entity', 'before_delete_relation')
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    def __call__(self):
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        getattr(self, self.event)()
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    def checkrel_if_necessary(self, opcls, rtype, eid):
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        """check an equivalent operation has not already been added"""
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        for op in self._cw.pending_operations:
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            if isinstance(op, opcls) and op.rtype == rtype and op.eid == eid:
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                break
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        else:
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            opcls(self._cw, rtype=rtype, eid=eid)
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    def after_add_entity(self):
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        eid = self.entity.eid
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        eschema = self.entity.e_schema
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        for rschema, targetschemas, x in eschema.relation_definitions():
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            # skip automatically handled relations
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            if rschema.type in DONT_CHECK_RTYPES_ON_ADD:
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                continue
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            if x == 'subject':
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                subjtype = eschema
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                objtype = targetschemas[0].type
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                cardindex = 0
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                opcls = _CheckSRelationOp
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            else:
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                subjtype = targetschemas[0].type
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                objtype = eschema
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                cardindex = 1
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                opcls = _CheckORelationOp
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            card = rschema.rproperty(subjtype, objtype, 'cardinality')
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            if card[cardindex] in '1+':
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                self.checkrel_if_necessary(opcls, rschema.type, eid)
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    def before_delete_relation(self):
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        rtype = self.rtype
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        if rtype in DONT_CHECK_RTYPES_ON_DEL:
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            return
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        session = self._cw
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        eidfrom, eidto = self.eidfrom, self.eidto
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        card = session.schema_rproperty(rtype, eidfrom, eidto, 'cardinality')
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        pendingrdefs = session.transaction_data.get('pendingrdefs', ())
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        if (session.describe(eidfrom)[0], rtype, session.describe(eidto)[0]) in pendingrdefs:
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            return
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        if card[0] in '1+' and not session.deleted_in_transaction(eidfrom):
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            self.checkrel_if_necessary(_CheckSRelationOp, rtype, eidfrom)
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        if card[1] in '1+' and not session.deleted_in_transaction(eidto):
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            self.checkrel_if_necessary(_CheckORelationOp, rtype, eidto)
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class _CheckConstraintsOp(hook.LateOperation):
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    """check a new relation satisfy its constraints
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    """
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    def precommit_event(self):
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        eidfrom, rtype, eidto = self.rdef
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        # first check related entities have not been deleted in the same
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        # transaction
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        if self.session.deleted_in_transaction(eidfrom):
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            return
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        if self.session.deleted_in_transaction(eidto):
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            return
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        for constraint in self.constraints:
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            try:
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                constraint.repo_check(self.session, eidfrom, rtype, eidto)
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            except NotImplementedError:
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                self.critical('can\'t check constraint %s, not supported',
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                              constraint)
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    def commit_event(self):
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        pass
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class CheckConstraintHook(IntegrityHook):
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    """check the relation satisfy its constraints
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    this is delayed to a precommit time operation since other relation which
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    will make constraint satisfied may be added later.
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    """
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    __id__ = 'checkconstraint'
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    events = ('after_add_relation',)
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    def __call__(self):
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        constraints = self._cw.schema_rproperty(self.rtype, self.eidfrom, self.eidto,
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                                'constraints')
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        if constraints:
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            _CheckConstraintsOp(self._cw, constraints=constraints,
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                               rdef=(self.eidfrom, self.rtype, self.eidto))
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class CheckUniqueHook(IntegrityHook):
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    __id__ = 'checkunique'
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    events = ('before_add_entity', 'before_update_entity')
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    def __call__(self):
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        entity = self.entity
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        eschema = entity.e_schema
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        for attr in entity.edited_attributes:
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            val = entity[attr]
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            if val is None:
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                continue
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            if eschema.subject_relation(attr).is_final() and \
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                   eschema.has_unique_values(attr):
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                rql = '%s X WHERE X %s %%(val)s' % (entity.e_schema, attr)
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                rset = self._cw.unsafe_execute(rql, {'val': val})
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                if rset and rset[0][0] != entity.eid:
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                    msg = self._cw._('the value "%s" is already used, use another one')
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                    raise ValidationError(entity.eid, {attr: msg % val})
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class _DelayedDeleteOp(hook.Operation):
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    """delete the object of composite relation except if the relation
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    has actually been redirected to another composite
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    """
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    def precommit_event(self):
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        session = self.session
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        # don't do anything if the entity is being created or deleted
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        if not (session.deleted_in_transaction(self.eid) or
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                session.added_in_transaction(self.eid)):
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            etype = session.describe(self.eid)[0]
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            session.unsafe_execute('DELETE %s X WHERE X eid %%(x)s, NOT %s'
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                                   % (etype, self.relation),
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                                   {'x': self.eid}, 'x')
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class DeleteCompositeOrphanHook(IntegrityHook):
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    """delete the composed of a composite relation when this relation is deleted
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    """
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    __id__ = 'deletecomposite'
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    events = ('before_delete_relation',)
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    def __call__(self):
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        composite = self._cw.schema_rproperty(self.rtype, self.eidfrom, self.eidto,
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                                                 'composite')
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        if composite == 'subject':
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            _DelayedDeleteOp(self._cw, eid=self.eidto,
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                             relation='Y %s X' % self.rtype)
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        elif composite == 'object':
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            _DelayedDeleteOp(self._cw, eid=self.eidfrom,
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                             relation='X %s Y' % self.rtype)
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class DontRemoveOwnersGroupHook(IntegrityHook):
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    """delete the composed of a composite relation when this relation is deleted
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    """
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    __id__ = 'checkownersgroup'
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    __select__ = IntegrityHook.__select__ & entity_implements('CWGroup')
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    events = ('before_delete_entity', 'before_update_entity')
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    def __call__(self):
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        if self.event == 'before_delete_entity' and self.entity.name == 'owners':
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            raise ValidationError(self.entity.eid, {None: self._cw._('can\'t be deleted')})
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        elif self.event == 'before_update_entity' and 'name' in self.entity.edited_attribute:
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            newname = self.entity.pop('name')
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            oldname = self.entity.name
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            if oldname == 'owners' and newname != oldname:
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                raise ValidationError(self.entity.eid, {'name': self._cw._('can\'t be changed')})
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            self.entity['name'] = newname
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class TidyHtmlFields(IntegrityHook):
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    """tidy HTML in rich text strings"""
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    __id__ = 'htmltidy'
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    events = ('before_add_entity', 'before_update_entity')
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    def __call__(self):
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        entity = self.entity
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        metaattrs = entity.e_schema.meta_attributes()
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        for metaattr, (metadata, attr) in metaattrs.iteritems():
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            if metadata == 'format' and attr in entity.edited_attributes:
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                try:
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                    value = entity[attr]
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                except KeyError:
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                    continue # no text to tidy
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                if isinstance(value, unicode): # filter out None and Binary
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                    if getattr(entity, str(metaattr)) == 'text/html':
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                        entity[attr] = soup2xhtml(value, self._cw.encoding)
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class StripCWUserLoginHook(IntegrityHook):
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    """ensure user logins are stripped"""
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    __id__ = 'stripuserlogin'
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    __select__ = IntegrityHook.__select__ & entity_implements('CWUser')
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    events = ('before_add_entity', 'before_update_entity',)
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    def call(self, session, entity):
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        if 'login' in entity.edited_attributes and entity['login']:
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            entity['login'] = entity['login'].strip()