hooks/workflow.py
author Erica Marco <erica.marco@logilab.fr>
Mon, 23 Mar 2015 11:08:04 +0100
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[documentation] add note concerning Attribute, TODAY and NOW in yams documentation
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# copyright 2003-2012 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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__docformat__ = "restructuredtext en"
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_ = unicode
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from datetime import datetime
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from cubicweb import RepositoryError, validation_error
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from cubicweb.predicates import is_instance, adaptable
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from cubicweb.server import hook
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def _change_state(cnx, x, oldstate, newstate):
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    nocheck = cnx.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
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    cnx.delete_relation(x, 'in_state', oldstate)
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    cnx.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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    entity = None # make pylint happy
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    def precommit_event(self):
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        cnx = self.cnx
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        entity = self.entity
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        iworkflowable = entity.cw_adapt_to('IWorkflowable')
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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 (cnx.deleted_in_transaction(entity.eid) or entity.in_state) \
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               and iworkflowable.current_workflow:
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            state = iworkflowable.current_workflow.initial
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            if state:
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                cnx.add_relation(entity.eid, 'in_state', state.eid)
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                _FireAutotransitionOp(cnx, 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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    entity = None # make pylint happy
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    def precommit_event(self):
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        entity = self.entity
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        iworkflowable = entity.cw_adapt_to('IWorkflowable')
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        autotrs = list(iworkflowable.possible_transitions('auto'))
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        if autotrs:
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            assert len(autotrs) == 1
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            iworkflowable.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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    eid = wfeid = None # make pylint happy
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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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        cnx = self.cnx
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        pendingeids = cnx.transaction_data.get('pendingeids', ())
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        if self.eid in pendingeids:
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            return
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        entity = cnx.entity_from_eid(self.eid)
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        iworkflowable = entity.cw_adapt_to('IWorkflowable')
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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 = iworkflowable.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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                msg = _('workflow has no initial state')
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                raise validation_error(entity, {('custom_workflow', 'subject'): msg})
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            if mainwf.state_by_eid(iworkflowable.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 iworkflowable.workflow_history:
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                if iworkflowable.current_state.eid != deststate.eid:
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                    _change_state(cnx, entity.eid,
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                                  iworkflowable.current_state.eid, deststate.eid)
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                    _FireAutotransitionOp(cnx, entity=entity)
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                return
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            msg = cnx._('workflow changed to "%s"')
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            msg %= cnx._(mainwf.name)
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            cnx.transaction_data[(entity.eid, 'customwf')] = self.wfeid
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            iworkflowable.change_state(deststate, msg, u'text/plain')
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   107
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class _CheckTrExitPoint(hook.Operation):
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    treid = None # make pylint happy
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   111
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    def precommit_event(self):
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        tr = self.cnx.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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                msg = _("can't have multiple exits on the same state")
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                raise validation_error(self.treid, {('subworkflow_exit', 'subject'): msg})
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            outputs.add(ep.subwf_state.eid)
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   121
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class _SubWorkflowExitOp(hook.Operation):
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    forentity = trinfo = None # make pylint happy
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   124
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    def precommit_event(self):
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        cnx = self.cnx
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        forentity = self.forentity
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        iworkflowable = forentity.cw_adapt_to('IWorkflowable')
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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 = iworkflowable.subworkflow_input_transition()
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        if wftr is None:
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            # inconsistency detected
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            msg = _("state doesn't belong to entity's current workflow")
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            raise validation_error(self.trinfo, {('to_state', 'subject'): msg})
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        tostate = wftr.get_exit_point(forentity, trinfo.cw_attr_cache['to_state'])
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        if tostate is not None:
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            # reached an exit point
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            msg = _('exiting from subworkflow %s')
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            msg %= cnx._(iworkflowable.current_workflow.name)
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            cnx.transaction_data[(forentity.eid, 'subwfentrytr')] = True
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            iworkflowable.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 = 'metadata'
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class SetInitialStateHook(WorkflowHook):
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    __regid__ = 'wfsetinitial'
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    __select__ = WorkflowHook.__select__ & adaptable('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 FireTransitionHook(WorkflowHook):
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    """check the transition is allowed and add missing information into the
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    TrInfo entity.
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    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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    Check for automatic transition to be fired at the end
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    """
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    __regid__ = 'wffiretransition'
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    __select__ = WorkflowHook.__select__ & is_instance('TrInfo')
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    events = ('before_add_entity',)
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    def __call__(self):
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        cnx = 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.cw_attr_cache['wf_info_for']
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   181
        except KeyError:
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            msg = _('mandatory relation')
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            raise validation_error(entity, {('wf_info_for', 'subject'): msg})
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        forentity = cnx.entity_from_eid(foreid)
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        # see comment in the TrInfo entity definition
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        entity.cw_edited['tr_count']=len(forentity.reverse_wf_info_for)
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        iworkflowable = forentity.cw_adapt_to('IWorkflowable')
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        # then check it has a workflow set, unless we're in the process of changing
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   189
        # entity's workflow
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        if cnx.transaction_data.get((forentity.eid, 'customwf')):
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            wfeid = cnx.transaction_data[(forentity.eid, 'customwf')]
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            wf = cnx.entity_from_eid(wfeid)
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   193
        else:
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            wf = iworkflowable.current_workflow
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   195
        if wf is None:
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            msg = _('related entity has no workflow set')
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            raise validation_error(entity, {None: msg})
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        # then check it has a state set
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   199
        fromstate = iworkflowable.current_state
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        if fromstate is None:
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            msg = _('related entity has no state')
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            raise validation_error(entity, {None: msg})
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        # True if we are coming back from subworkflow
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        swtr = cnx.transaction_data.pop((forentity.eid, 'subwfentrytr'), None)
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        cowpowers = (cnx.user.is_in_group('managers')
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                     or not cnx.write_security)
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        # no investigate the requested state change...
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        try:
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            treid = entity.cw_attr_cache['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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                msg = _('mandatory relation')
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                raise validation_error(entity, {('by_transition', 'subject'): msg})
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            deststateeid = entity.cw_attr_cache.get('to_state')
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            if not deststateeid:
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                msg = _('mandatory relation')
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                raise validation_error(entity, {('by_transition', 'subject'): msg})
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            deststate = wf.state_by_eid(deststateeid)
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            if deststate is None:
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                msg = _("state doesn't belong to entity's workflow")
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                raise validation_error(entity, {('to_state', 'subject'): 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 = cnx.entity_from_eid(treid)
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            if swtr is None:
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                qname = ('by_transition', 'subject')
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                if tr is None:
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                    msg = _("transition doesn't belong to entity's workflow")
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                    raise validation_error(entity, {qname: msg})
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                if not tr.has_input_state(fromstate):
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                    msg = _("transition %(tr)s isn't allowed from %(st)s")
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                    raise validation_error(entity, {qname: msg}, {
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                            'tr': tr.name, 'st': fromstate.name}, ['tr', 'st'])
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                if not tr.may_be_fired(foreid):
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                    msg = _("transition may not be fired")
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                    raise validation_error(entity, {qname: msg})
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            deststateeid = entity.cw_attr_cache.get('to_state')
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            if deststateeid is not None:
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                if not cowpowers and deststateeid != tr.destination(forentity).eid:
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                    msg = _("transition isn't allowed")
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                    raise validation_error(entity, {('by_transition', 'subject'): msg})
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                if swtr is None:
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                    deststate = cnx.entity_from_eid(deststateeid)
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                    if not cowpowers and deststate is None:
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                        msg = _("state doesn't belong to entity's workflow")
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                        raise validation_error(entity, {('to_state', 'subject'): 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.cw_edited['from_state'] = fromstate.eid
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        entity.cw_edited['to_state'] = deststateeid
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        nocheck = cnx.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(cnx, entity=forentity)
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class FiredTransitionHook(WorkflowHook):
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    """change related entity state and handle exit of subworkflow"""
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   263
    __regid__ = 'wffiretransition'
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    __select__ = WorkflowHook.__select__ & is_instance('TrInfo')
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    events = ('after_add_entity',)
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   266
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    def __call__(self):
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   268
        trinfo = self.entity
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        rcache = trinfo.cw_attr_cache
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        _change_state(self._cw, rcache['wf_info_for'], rcache['from_state'],
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   271
                      rcache['to_state'])
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   272
        forentity = self._cw.entity_from_eid(rcache['wf_info_for'])
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   273
        iworkflowable = forentity.cw_adapt_to('IWorkflowable')
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        assert iworkflowable.current_state.eid == rcache['to_state']
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   275
        if iworkflowable.main_workflow.eid != iworkflowable.current_workflow.eid:
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   276
            _SubWorkflowExitOp(self._cw, forentity=forentity, trinfo=trinfo)
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   277
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   278
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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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   281
    """
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   282
    __regid__ = 'wfcheckinstate'
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   283
    __select__ = WorkflowHook.__select__ & hook.match_rtype('in_state')
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    events = ('before_add_relation',)
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   285
    category = 'integrity'
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   286
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   287
    def __call__(self):
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   288
        cnx = self._cw
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   289
        nocheck = cnx.transaction_data.get('skip-security', ())
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   290
        if (self.eidfrom, 'in_state', self.eidto) in nocheck:
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   291
            # state changed through TrInfo insertion, so we already know it's ok
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   292
            return
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   293
        entity = cnx.entity_from_eid(self.eidfrom)
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   294
        iworkflowable = entity.cw_adapt_to('IWorkflowable')
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   295
        mainwf = iworkflowable.main_workflow
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   296
        if mainwf is None:
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   297
            msg = _('entity has no workflow set')
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   298
            raise validation_error(entity, {None: msg})
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   299
        for wf in mainwf.iter_workflows():
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   300
            if wf.state_by_eid(self.eidto):
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                break
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   302
        else:
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   303
            msg = _("state doesn't belong to entity's workflow. You may "
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   304
                    "want to set a custom workflow for this entity first.")
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   305
            raise validation_error(self.eidfrom, {('in_state', 'subject'): msg})
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   306
        if iworkflowable.current_workflow and wf.eid != iworkflowable.current_workflow.eid:
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   307
            msg = _("state doesn't belong to entity's current workflow")
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   308
            raise validation_error(self.eidfrom, {('in_state', 'subject'): msg})
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   309
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class SetModificationDateOnStateChange(WorkflowHook):
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    """update entity's modification date after changing its state"""
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    __regid__ = 'wfsyncmdate'
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    __select__ = WorkflowHook.__select__ & hook.match_rtype('in_state')
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    events = ('after_add_relation',)
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   316
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    def __call__(self):
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        if self._cw.added_in_transaction(self.eidfrom):
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   319
            # new entity, not needed
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            return
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   321
        entity = self._cw.entity_from_eid(self.eidfrom)
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        try:
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   323
            entity.cw_set(modification_date=datetime.now())
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   324
        except RepositoryError as ex:
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            # usually occurs if entity is coming from a read-only source
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   326
            # (eg ldap user)
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            self.warning('cant change modification date for %s: %s', entity, ex)
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   328
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   329
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   330
class CheckWorkflowTransitionExitPoint(WorkflowHook):
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    """check that there is no multiple exits from the same state"""
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   332
    __regid__ = 'wfcheckwftrexit'
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   333
    __select__ = WorkflowHook.__select__ & hook.match_rtype('subworkflow_exit')
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   334
    events = ('after_add_relation',)
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   335
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   336
    def __call__(self):
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   337
        _CheckTrExitPoint(self._cw, treid=self.eidfrom)
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   338
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   339
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   340
class SetCustomWorkflow(WorkflowHook):
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   341
    __regid__ = 'wfsetcustom'
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   342
    __select__ = WorkflowHook.__select__ & hook.match_rtype('custom_workflow')
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   343
    events = ('after_add_relation',)
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   344
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   345
    def __call__(self):
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   346
        _WorkflowChangedOp(self._cw, eid=self.eidfrom, wfeid=self.eidto)
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   347
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   348
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   349
class DelCustomWorkflow(SetCustomWorkflow):
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   350
    __regid__ = 'wfdelcustom'
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   351
    events = ('after_delete_relation',)
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   352
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   353
    def __call__(self):
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   354
        entity = self._cw.entity_from_eid(self.eidfrom)
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   355
        typewf = entity.cw_adapt_to('IWorkflowable').cwetype_workflow()
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   356
        if typewf is not None:
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   357
            _WorkflowChangedOp(self._cw, eid=self.eidfrom, wfeid=typewf.eid)
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   358