hooks/integrity.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 28 Apr 2010 12:24:20 +0200
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Core hooks: check for data integrity according to the instance'schema
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validity
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"""
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__docformat__ = "restructuredtext en"
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from threading import Lock
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from yams.schema import role_name
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from cubicweb import ValidationError
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from cubicweb.schema import RQLConstraint, RQLUniqueConstraint
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from cubicweb.selectors import implements
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from cubicweb.uilib import soup2xhtml
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from cubicweb.server import hook
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from cubicweb.server.hook import set_operation
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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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_UNIQUE_CONSTRAINTS_LOCK = Lock()
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_UNIQUE_CONSTRAINTS_HOLDER = None
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def _acquire_unique_cstr_lock(session):
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    """acquire the _UNIQUE_CONSTRAINTS_LOCK for the session.
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    This lock used to avoid potential integrity pb when checking
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    RQLUniqueConstraint in two different transactions, as explained in
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    http://intranet.logilab.fr/jpl/ticket/36564
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    """
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    if 'uniquecstrholder' in session.transaction_data:
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        return
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    _UNIQUE_CONSTRAINTS_LOCK.acquire()
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    session.transaction_data['uniquecstrholder'] = True
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    # register operation responsible to release the lock on commit/rollback
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    _ReleaseUniqueConstraintsOperation(session)
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def _release_unique_cstr_lock(session):
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    if 'uniquecstrholder' in session.transaction_data:
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        del session.transaction_data['uniquecstrholder']
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        _UNIQUE_CONSTRAINTS_LOCK.release()
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class _ReleaseUniqueConstraintsOperation(hook.Operation):
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    def commit_event(self):
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        pass
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    def postcommit_event(self):
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        _release_unique_cstr_lock(self.session)
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    def rollback_event(self):
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        _release_unique_cstr_lock(self.session)
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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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    role = key = base_rql = None
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    def precommit_event(self):
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        session =self.session
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        pendingeids = session.transaction_data.get('pendingeids', ())
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        pendingrtypes = session.transaction_data.get('pendingrtypes', ())
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        # poping key is not optional: if further operation trigger new deletion
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        # of relation, we'll need a new operation
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        for eid, rtype in session.transaction_data.pop(self.key):
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            # recheck pending eids / relation types
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            if eid in pendingeids:
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                continue
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            if rtype in pendingrtypes:
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                continue
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            if not session.execute(self.base_rql % rtype, {'x': eid}):
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                etype = session.describe(eid)[0]
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                _ = session._
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                msg = _('at least one relation %(rtype)s is required on '
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                        '%(etype)s (%(eid)s)')
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                msg %= {'rtype': _(rtype), 'etype': _(etype), 'eid': eid}
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                raise ValidationError(eid, {role_name(rtype, self.role): msg})
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class _CheckSRelationOp(_CheckRequiredRelationOperation):
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    """check required subject relation"""
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    role = 'subject'
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    key = '_cwisrel'
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    base_rql = 'Any O WHERE S eid %%(x)s, S %s O'
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class _CheckORelationOp(_CheckRequiredRelationOperation):
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    """check required object relation"""
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    role = 'object'
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    key = '_cwiorel'
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    base_rql = 'Any S WHERE O eid %%(x)s, S %s O'
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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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    __regid__ = '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 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, role 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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            rdef = rschema.role_rdef(eschema, targetschemas[0], role)
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            if rdef.role_cardinality(role) in '1+':
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                if role == 'subject':
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                    set_operation(self._cw, '_cwisrel', (eid, rschema.type),
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                                  _CheckSRelationOp)
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                else:
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                    set_operation(self._cw, '_cwiorel', (eid, rschema.type),
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                                  _CheckORelationOp)
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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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        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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        card = session.schema_rproperty(rtype, eidfrom, eidto, 'cardinality')
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        if card[0] in '1+' and not session.deleted_in_transaction(eidfrom):
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            set_operation(self._cw, '_cwisrel', (eidfrom, rtype),
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                          _CheckSRelationOp)
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        if card[1] in '1+' and not session.deleted_in_transaction(eidto):
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            set_operation(self._cw, '_cwiorel', (eidto, rtype),
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                          _CheckORelationOp)
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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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            # XXX
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            # * lock RQLConstraint as well?
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            # * use a constraint id to use per constraint lock and avoid
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            #   unnecessary commit serialization ?
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            if isinstance(constraint, RQLUniqueConstraint):
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                _acquire_unique_cstr_lock(self.session)
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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 (or unsatisfied) may be added later.
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    """
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    __regid__ = 'checkconstraint'
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    events = ('after_add_relation',)
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    def __call__(self):
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        # XXX get only RQL[Unique]Constraints?
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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 CheckAttributeConstraintHook(IntegrityHook):
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    """check the attribute 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 (or unsatisfied) may be added later.
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    """
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    __regid__ = 'checkattrconstraint'
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    events = ('after_add_entity', 'after_update_entity')
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    def __call__(self):
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        eschema = self.entity.e_schema
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        for attr in self.entity.edited_attributes:
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            if eschema.subjrels[attr].final:
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                constraints = [c for c in eschema.rdef(attr).constraints
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                               if isinstance(c, (RQLUniqueConstraint, RQLConstraint))]
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                if constraints:
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                    _CheckConstraintsOp(self._cw, constraints=constraints,
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                                        rdef=(self.entity.eid, attr, None))
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class CheckUniqueHook(IntegrityHook):
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    __regid__ = '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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            if eschema.subjrels[attr].final and eschema.has_unique_values(attr):
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                val = entity[attr]
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                if val is None:
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                    continue
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                rql = '%s X WHERE X %s %%(val)s' % (entity.e_schema, attr)
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                rset = self._cw.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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                    qname = role_name(attr, 'subject')
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                    raise ValidationError(entity.eid, {qname: msg % val})
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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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    __regid__ = 'checkownersgroup'
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    __select__ = IntegrityHook.__select__ & 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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            msg = self._cw._('can\'t be deleted')
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            raise ValidationError(self.entity.eid, {None: msg})
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        elif self.event == 'before_update_entity' and \
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                 'name' in self.entity.edited_attributes:
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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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                qname = role_name('name', 'subject')
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                msg = self._cw._('can\'t be changed')
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                raise ValidationError(self.entity.eid, {qname: msg})
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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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    __regid__ = '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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    __regid__ = 'stripuserlogin'
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    __select__ = IntegrityHook.__select__ & implements('CWUser')
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    events = ('before_add_entity', 'before_update_entity',)
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    def __call__(self):
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        user = self.entity
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        if 'login' in user.edited_attributes and user.login:
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            user.login = user.login.strip()
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# 'active' integrity hooks: you usually don't want to deactivate them, they are
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# not really integrity check, they maintain consistency on changes
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class _DelayedDeleteOp(hook.Operation):
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    """delete the object of composite relation except if the relation has
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    actually been redirected to another composite
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    """
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    key = base_rql = None
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    def precommit_event(self):
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        session = self.session
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        pendingeids = session.transaction_data.get('pendingeids', ())
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        neweids = session.transaction_data.get('neweids', ())
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        # poping key is not optional: if further operation trigger new deletion
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        # of composite relation, we'll need a new operation
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        for eid, rtype in session.transaction_data.pop(self.key):
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            # don't do anything if the entity is being created or deleted
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            if not (eid in pendingeids or eid in neweids):
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                etype = session.describe(eid)[0]
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                session.execute(self.base_rql % (etype, rtype), {'x': eid})
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class _DelayedDeleteSEntityOp(_DelayedDeleteOp):
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    """delete orphan subject entity of a composite relation"""
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    key = '_cwiscomp'
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    base_rql = 'DELETE %s X WHERE X eid %%(x)s, NOT X %s Y'
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class _DelayedDeleteOEntityOp(_DelayedDeleteOp):
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    """check required object relation"""
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    key = '_cwiocomp'
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    base_rql = 'DELETE %s X WHERE X eid %%(x)s, NOT Y %s X'
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class DeleteCompositeOrphanHook(hook.Hook):
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    """delete the composed of a composite relation when this relation is deleted
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    """
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    __regid__ = 'deletecomposite'
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    events = ('before_delete_relation',)
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    category = 'activeintegrity'
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    def __call__(self):
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        # if the relation is being delete, don't delete composite's components
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        # automatically
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        pendingrdefs = self._cw.transaction_data.get('pendingrdefs', ())
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        if (self._cw.describe(self.eidfrom)[0], self.rtype,
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            self._cw.describe(self.eidto)[0]) in pendingrdefs:
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            return
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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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            set_operation(self._cw, '_cwiocomp', (self.eidto, self.rtype),
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                          _DelayedDeleteOEntityOp)
5007
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        elif composite == 'object':
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            set_operation(self._cw, '_cwiscomp', (self.eidfrom, self.rtype),
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                          _DelayedDeleteSEntityOp)