hooks/workflow.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 05 May 2010 18:10:33 +0200
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permissions -rw-r--r--
backport stable
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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: workflow related hooks
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"""
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__docformat__ = "restructuredtext en"
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from datetime import datetime
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from yams.schema import role_name
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from cubicweb import RepositoryError, ValidationError
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from cubicweb.interfaces import IWorkflowable
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from cubicweb.selectors import implements
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from cubicweb.server import hook
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def _change_state(session, x, oldstate, newstate):
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    nocheck = session.transaction_data.setdefault('skip-security', set())
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    nocheck.add((x, 'in_state', oldstate))
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    nocheck.add((x, 'in_state', newstate))
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    # delete previous state first unless in_state isn't stored in the system
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    # source
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    fromsource = session.describe(x)[1]
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    if fromsource == 'system' or \
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           not session.repo.sources_by_uri[fromsource].support_relation('in_state'):
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        session.delete_relation(x, 'in_state', oldstate)
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    session.add_relation(x, 'in_state', newstate)
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# operations ###################################################################
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class _SetInitialStateOp(hook.Operation):
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    """make initial state be a default state"""
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    def precommit_event(self):
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        session = self.session
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        entity = self.entity
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        # if there is an initial state and the entity's state is not set,
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        # use the initial state as a default state
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        if not (session.deleted_in_transaction(entity.eid) or entity.in_state) \
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               and entity.current_workflow:
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            state = entity.current_workflow.initial
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            if state:
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                session.add_relation(entity.eid, 'in_state', state.eid)
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                _FireAutotransitionOp(session, entity=entity)
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class _FireAutotransitionOp(hook.Operation):
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    """try to fire auto transition after state changes"""
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    def precommit_event(self):
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        entity = self.entity
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        autotrs = list(entity.possible_transitions('auto'))
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        if autotrs:
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            assert len(autotrs) == 1
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            entity.fire_transition(autotrs[0])
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class _WorkflowChangedOp(hook.Operation):
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    """fix entity current state when changing its workflow"""
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    def precommit_event(self):
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        # notice that enforcement that new workflow apply to the entity's type is
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        # done by schema rule, no need to check it here
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        session = self.session
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        pendingeids = session.transaction_data.get('pendingeids', ())
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        if self.eid in pendingeids:
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            return
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        entity = session.entity_from_eid(self.eid)
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        # check custom workflow has not been rechanged to another one in the same
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        # transaction
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        mainwf = entity.main_workflow
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        if mainwf.eid == self.wfeid:
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            deststate = mainwf.initial
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            if not deststate:
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                qname = role_name('custom_workflow', 'subject')
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                msg = session._('workflow has no initial state')
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                raise ValidationError(entity.eid, {qname: msg})
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            if mainwf.state_by_eid(entity.current_state.eid):
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                # nothing to do
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                return
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            # if there are no history, simply go to new workflow's initial state
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            if not entity.workflow_history:
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                if entity.current_state.eid != deststate.eid:
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                    _change_state(session, entity.eid,
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                                  entity.current_state.eid, deststate.eid)
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                    _FireAutotransitionOp(session, entity=entity)
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                return
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            msg = session._('workflow changed to "%s"')
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            msg %= session._(mainwf.name)
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            session.transaction_data[(entity.eid, 'customwf')] = self.wfeid
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            entity.change_state(deststate, msg, u'text/plain')
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class _CheckTrExitPoint(hook.Operation):
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   111
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    def precommit_event(self):
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        tr = self.session.entity_from_eid(self.treid)
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        outputs = set()
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        for ep in tr.subworkflow_exit:
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            if ep.subwf_state.eid in outputs:
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                qname = role_name('subworkflow_exit', 'subject')
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                msg = self.session._("can't have multiple exits on the same state")
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                raise ValidationError(self.treid, {qname: msg})
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            outputs.add(ep.subwf_state.eid)
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class _SubWorkflowExitOp(hook.Operation):
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    def precommit_event(self):
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        session = self.session
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        forentity = self.forentity
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        trinfo = self.trinfo
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        # we're in a subworkflow, check if we've reached an exit point
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        wftr = forentity.subworkflow_input_transition()
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        if wftr is None:
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            # inconsistency detected
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            qname = role_name('to_state', 'subject')
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            msg = session._("state doesn't belong to entity's current workflow")
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            raise ValidationError(self.trinfo.eid, {'to_state': msg})
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        tostate = wftr.get_exit_point(forentity, trinfo['to_state'])
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        if tostate is not None:
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            # reached an exit point
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            msg = session._('exiting from subworkflow %s')
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            msg %= session._(forentity.current_workflow.name)
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            session.transaction_data[(forentity.eid, 'subwfentrytr')] = True
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            forentity.change_state(tostate, msg, u'text/plain', tr=wftr)
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# hooks ########################################################################
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class WorkflowHook(hook.Hook):
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    __abstract__ = True
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    category = 'worfklow'
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class SetInitialStateHook(WorkflowHook):
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    __regid__ = 'wfsetinitial'
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    __select__ = WorkflowHook.__select__ & implements(IWorkflowable)
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    events = ('after_add_entity',)
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    def __call__(self):
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        _SetInitialStateOp(self._cw, entity=self.entity)
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class PrepareStateChangeHook(WorkflowHook):
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    """record previous state information"""
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    __regid__ = 'cwdelstate'
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    __select__ = WorkflowHook.__select__ & hook.match_rtype('in_state')
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    events = ('before_delete_relation',)
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    def __call__(self):
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        self._cw.transaction_data.setdefault('pendingrelations', []).append(
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            (self.eidfrom, self.rtype, self.eidto))
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class FireTransitionHook(WorkflowHook):
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    """check the transition is allowed, add missing information. Expect that:
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    * wf_info_for inlined relation is set
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    * by_transition or to_state (managers only) inlined relation is set
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    """
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    __regid__ = 'wffiretransition'
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    __select__ = WorkflowHook.__select__ & implements('TrInfo')
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    events = ('before_add_entity',)
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    def __call__(self):
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        session = self._cw
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        entity = self.entity
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        # first retreive entity to which the state change apply
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        try:
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            foreid = entity['wf_info_for']
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        except KeyError:
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            qname = role_name('wf_info_for', 'subject')
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            msg = session._('mandatory relation')
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            raise ValidationError(entity.eid, {qname: msg})
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        forentity = session.entity_from_eid(foreid)
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        # then check it has a workflow set, unless we're in the process of changing
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        # entity's workflow
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        if session.transaction_data.get((forentity.eid, 'customwf')):
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            wfeid = session.transaction_data[(forentity.eid, 'customwf')]
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            wf = session.entity_from_eid(wfeid)
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        else:
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            wf = forentity.current_workflow
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        if wf is None:
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            msg = session._('related entity has no workflow set')
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            raise ValidationError(entity.eid, {None: msg})
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        # then check it has a state set
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        fromstate = forentity.current_state
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        if fromstate is None:
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            msg = session._('related entity has no state')
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            raise ValidationError(entity.eid, {None: msg})
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        # True if we are coming back from subworkflow
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        swtr = session.transaction_data.pop((forentity.eid, 'subwfentrytr'), None)
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        cowpowers = (session.user.is_in_group('managers')
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                     or not session.write_security)
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        # no investigate the requested state change...
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        try:
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            treid = entity['by_transition']
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        except KeyError:
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            # no transition set, check user is a manager and destination state
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            # is specified (and valid)
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            if not cowpowers:
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                qname = role_name('by_transition', 'subject')
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                msg = session._('mandatory relation')
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                raise ValidationError(entity.eid, {qname: msg})
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            deststateeid = entity.get('to_state')
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            if not deststateeid:
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                qname = role_name('by_transition', 'subject')
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                msg = session._('mandatory relation')
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                raise ValidationError(entity.eid, {qname: msg})
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            deststate = wf.state_by_eid(deststateeid)
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            if deststate is None:
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                qname = role_name('to_state', 'subject')
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                msg = session._("state doesn't belong to entity's workflow")
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                raise ValidationError(entity.eid, {qname: msg})
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        else:
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            # check transition is valid and allowed, unless we're coming back
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            # from subworkflow
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            tr = session.entity_from_eid(treid)
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            if swtr is None:
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                qname = role_name('by_transition', 'subject')
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                if tr is None:
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                    msg = session._("transition doesn't belong to entity's workflow")
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                    raise ValidationError(entity.eid, {qname: msg})
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                if not tr.has_input_state(fromstate):
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                    msg = session._("transition %(tr)s isn't allowed from %(st)s") % {
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                        'tr': session._(tr.name), 'st': session._(fromstate.name)}
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                    raise ValidationError(entity.eid, {qname: msg})
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                if not tr.may_be_fired(foreid):
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                    msg = session._("transition may not be fired")
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                    raise ValidationError(entity.eid, {qname: msg})
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            if entity.get('to_state'):
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                deststateeid = entity['to_state']
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                if not cowpowers and deststateeid != tr.destination(forentity).eid:
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                    qname = role_name('by_transition', 'subject')
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                    msg = session._("transition isn't allowed")
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                    raise ValidationError(entity.eid, {qname: msg})
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                if swtr is None:
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                    deststate = session.entity_from_eid(deststateeid)
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                    if not cowpowers and deststate is None:
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                        qname = role_name('to_state', 'subject')
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                        msg = session._("state doesn't belong to entity's workflow")
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                        raise ValidationError(entity.eid, {qname: msg})
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            else:
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                deststateeid = tr.destination(forentity).eid
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        # everything is ok, add missing information on the trinfo entity
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        entity['from_state'] = fromstate.eid
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        entity['to_state'] = deststateeid
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        nocheck = session.transaction_data.setdefault('skip-security', set())
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        nocheck.add((entity.eid, 'from_state', fromstate.eid))
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        nocheck.add((entity.eid, 'to_state', deststateeid))
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        _FireAutotransitionOp(session, entity=forentity)
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class FiredTransitionHook(WorkflowHook):
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    """change related entity state"""
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    __regid__ = 'wffiretransition'
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    __select__ = WorkflowHook.__select__ & implements('TrInfo')
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    events = ('after_add_entity',)
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    def __call__(self):
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        trinfo = self.entity
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        _change_state(self._cw, trinfo['wf_info_for'],
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                      trinfo['from_state'], trinfo['to_state'])
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        forentity = self._cw.entity_from_eid(trinfo['wf_info_for'])
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        assert forentity.current_state.eid == trinfo['to_state']
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        if forentity.main_workflow.eid != forentity.current_workflow.eid:
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            _SubWorkflowExitOp(self._cw, forentity=forentity, trinfo=trinfo)
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class CheckInStateChangeAllowed(WorkflowHook):
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    """check state apply, in case of direct in_state change using unsafe execute
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    """
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    __regid__ = 'wfcheckinstate'
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    __select__ = WorkflowHook.__select__ & hook.match_rtype('in_state')
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    events = ('before_add_relation',)
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   292
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    def __call__(self):
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   294
        session = self._cw
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        nocheck = session.transaction_data.get('skip-security', ())
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        if (self.eidfrom, 'in_state', self.eidto) in nocheck:
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            # state changed through TrInfo insertion, so we already know it's ok
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   298
            return
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        entity = session.entity_from_eid(self.eidfrom)
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        mainwf = entity.main_workflow
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        if mainwf is None:
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            msg = session._('entity has no workflow set')
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            raise ValidationError(entity.eid, {None: msg})
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        for wf in mainwf.iter_workflows():
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            if wf.state_by_eid(self.eidto):
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                break
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   307
        else:
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            qname = role_name('in_state', 'subject')
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   309
            msg = session._("state doesn't belong to entity's workflow. You may "
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                            "want to set a custom workflow for this entity first.")
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            raise ValidationError(self.eidfrom, {qname: msg})
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        if entity.current_workflow and wf.eid != entity.current_workflow.eid:
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            qname = role_name('in_state', 'subject')
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            msg = session._("state doesn't belong to entity's current workflow")
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   315
            raise ValidationError(self.eidfrom, {qname: msg})
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class SetModificationDateOnStateChange(WorkflowHook):
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   319
    """update entity's modification date after changing its state"""
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   320
    __regid__ = 'wfsyncmdate'
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   321
    __select__ = WorkflowHook.__select__ & hook.match_rtype('in_state')
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   322
    events = ('after_add_relation',)
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   323
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   324
    def __call__(self):
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   325
        if self._cw.added_in_transaction(self.eidfrom):
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   326
            # new entity, not needed
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   327
            return
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   328
        entity = self._cw.entity_from_eid(self.eidfrom)
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   329
        try:
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   330
            entity.set_attributes(modification_date=datetime.now())
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   331
        except RepositoryError, ex:
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   332
            # usually occurs if entity is coming from a read-only source
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   333
            # (eg ldap user)
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   334
            self.warning('cant change modification date for %s: %s', entity, ex)
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   335
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   336
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   337
class CheckWorkflowTransitionExitPoint(WorkflowHook):
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   338
    """check that there is no multiple exits from the same state"""
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   339
    __regid__ = 'wfcheckwftrexit'
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   340
    __select__ = WorkflowHook.__select__ & hook.match_rtype('subworkflow_exit')
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   341
    events = ('after_add_relation',)
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   342
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   343
    def __call__(self):
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   344
        _CheckTrExitPoint(self._cw, treid=self.eidfrom)
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   345
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   346
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   347
class SetCustomWorkflow(WorkflowHook):
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   348
    __regid__ = 'wfsetcustom'
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   349
    __select__ = WorkflowHook.__select__ & hook.match_rtype('custom_workflow')
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   350
    events = ('after_add_relation',)
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diff changeset
   351
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   352
    def __call__(self):
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   353
        _WorkflowChangedOp(self._cw, eid=self.eidfrom, wfeid=self.eidto)
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diff changeset
   354
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diff changeset
   355
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   356
class DelCustomWorkflow(SetCustomWorkflow):
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   357
    __regid__ = 'wfdelcustom'
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   358
    events = ('after_delete_relation',)
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diff changeset
   359
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   360
    def __call__(self):
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diff changeset
   361
        entity = self._cw.entity_from_eid(self.eidfrom)
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diff changeset
   362
        typewf = entity.cwetype_workflow()
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diff changeset
   363
        if typewf is not None:
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diff changeset
   364
            _WorkflowChangedOp(self._cw, eid=self.eidfrom, wfeid=typewf.eid)
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diff changeset
   365