hooks/notification.py
author Julien Cristau <julien.cristau@logilab.fr>
Mon, 07 Apr 2014 14:15:35 +0200
changeset 9632 c60c8dec0e0e
parent 9618 1b8552265f3b
child 10351 91e63306e277
permissions -rw-r--r--
[hooks/notification] Fix indentation Follow-up for changeset 1b8552265f3b "[hooks/notification] use a cnx not a session"
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# copyright 2003-2013 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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"""some hooks to handle notification on entity's changes"""
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__docformat__ = "restructuredtext en"
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from logilab.common.textutils import normalize_text
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from logilab.common.deprecation import deprecated
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from cubicweb import RegistryNotFound
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from cubicweb.predicates import is_instance
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from cubicweb.server import hook
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from cubicweb.sobjects.supervising import SupervisionMailOp
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@deprecated('[3.17] use notify_on_commit instead')
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def RenderAndSendNotificationView(cnx, view, viewargs=None):
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    notify_on_commit(cnx, view, viewargs)
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def notify_on_commit(cnx, view, viewargs=None):
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    """register a notification view (see
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    :class:`~cubicweb.sobjects.notification.NotificationView`) to be sent at
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    post-commit time, ie only if the transaction has succeeded.
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    `viewargs` is an optional dictionary containing extra argument to be given
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    to :meth:`~cubicweb.sobjects.notification.NotificationView.render_and_send`
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    """
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    if viewargs is None:
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        viewargs = {}
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    notif_op = _RenderAndSendNotificationOp.get_instance(cnx)
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    notif_op.add_data((view, viewargs))
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class _RenderAndSendNotificationOp(hook.DataOperationMixIn, hook.Operation):
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    """End of the notification chain. Do render and send views after commit
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    All others Operations end up adding data to this Operation.
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    The notification are done on ``postcommit_event`` to make sure to prevent
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    sending notification about rolled back data.
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    """
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    containercls = list
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    def postcommit_event(self):
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        deleted = self.cnx.deleted_in_transaction
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        for view, viewargs in self.get_data():
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            if view.cw_rset is not None:
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                if not view.cw_rset:
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                    # entity added and deleted in the same transaction
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                    # (cache effect)
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                    continue
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                elif deleted(view.cw_rset[view.cw_row or 0][view.cw_col or 0]):
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                    # entity added and deleted in the same transaction
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                    continue
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            try:
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                view.render_and_send(**viewargs)
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            except Exception:
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                # error in post commit are not propagated
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                # We keep this logic here to prevent a small notification error
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                # to prevent them all.
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                self.exception('Notification failed')
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class NotificationHook(hook.Hook):
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    __abstract__ = True
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    category = 'notification'
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    def select_view(self, vid, rset, row=0, col=0):
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        try:
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            return self._cw.vreg['views'].select_or_none(vid, self._cw, rset=rset,
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                                                         row=row, col=col)
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        except RegistryNotFound: # can happen in some config
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                                 # (e.g. repo only config with no
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                                 # notification views registered by
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                                 # the instance's cubes)
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            return None
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class StatusChangeHook(NotificationHook):
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    """notify when a workflowable entity has its state modified"""
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    __regid__ = 'notifystatuschange'
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    __select__ = NotificationHook.__select__ & is_instance('TrInfo')
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    events = ('after_add_entity',)
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    def __call__(self):
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        entity = self.entity
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        if not entity.from_state: # not a transition
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            return
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        rset = entity.related('wf_info_for')
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        view = self.select_view('notif_status_change', rset=rset, row=0)
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        if view is None:
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            return
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        comment = entity.printable_value('comment', format='text/plain')
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        # XXX don't try to wrap rest until we've a proper transformation (see
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        # #103822)
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        if comment and entity.comment_format != 'text/rest':
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            comment = normalize_text(comment, 80)
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        viewargs = {'comment': comment,
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                    'previous_state': entity.previous_state.name,
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                    'current_state': entity.new_state.name}
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        notify_on_commit(self._cw, view, viewargs=viewargs)
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class RelationChangeHook(NotificationHook):
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    __regid__ = 'notifyrelationchange'
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    events = ('before_add_relation', 'after_add_relation',
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              'before_delete_relation', 'after_delete_relation')
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    def __call__(self):
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        """if a notification view is defined for the event, send notification
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        email defined by the view
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        """
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        rset = self._cw.eid_rset(self.eidfrom)
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        view = self.select_view('notif_%s_%s' % (self.event,  self.rtype),
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                                rset=rset, row=0)
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        if view is None:
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            return
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        notify_on_commit(self._cw, view)
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class EntityChangeHook(NotificationHook):
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    """if a notification view is defined for the event, send notification
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    email defined by the view
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    """
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    __regid__ = 'notifyentitychange'
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    events = ('after_add_entity', 'after_update_entity')
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    def __call__(self):
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        rset = self.entity.as_rset()
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        view = self.select_view('notif_%s' % self.event, rset=rset, row=0)
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        if view is None:
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            return
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        notify_on_commit(self._cw, view)
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class EntityUpdatedNotificationOp(hook.SingleLastOperation):
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    """scrap all changed entity to prepare a Notification Operation for them"""
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    def precommit_event(self):
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        # precommit event that creates postcommit operation
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        cnx = self.cnx
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        for eid in cnx.transaction_data['changes']:
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            view = cnx.vreg['views'].select('notif_entity_updated', cnx,
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                                            rset=cnx.eid_rset(eid),
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                                            row=0)
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            notify_on_commit(self.cnx, view,
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                    viewargs={'changes': cnx.transaction_data['changes'][eid]})
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class EntityUpdateHook(NotificationHook):
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    __regid__ = 'notifentityupdated'
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    __abstract__ = True # do not register by default
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    __select__ = NotificationHook.__select__ & hook.from_dbapi_query()
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    events = ('before_update_entity',)
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    skip_attrs = set()
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    def __call__(self):
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        cnx = self._cw
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        if cnx.added_in_transaction(self.entity.eid):
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            return # entity is being created
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        # then compute changes
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        attrs = [k for k in self.entity.cw_edited
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                 if not k in self.skip_attrs]
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        if not attrs:
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            return
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        changes = cnx.transaction_data.setdefault('changes', {})
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        thisentitychanges = changes.setdefault(self.entity.eid, set())
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        rqlsel, rqlrestr = [], ['X eid %(x)s']
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        for i, attr in enumerate(attrs):
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            var = chr(65+i)
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            rqlsel.append(var)
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            rqlrestr.append('X %s %s' % (attr, var))
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        rql = 'Any %s WHERE %s' % (','.join(rqlsel), ','.join(rqlrestr))
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        rset = cnx.execute(rql, {'x': self.entity.eid})
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        for i, attr in enumerate(attrs):
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            oldvalue = rset[0][i]
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            newvalue = self.entity.cw_edited[attr]
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            if oldvalue != newvalue:
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                thisentitychanges.add((attr, oldvalue, newvalue))
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        if thisentitychanges:
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            EntityUpdatedNotificationOp(cnx)
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# supervising ##################################################################
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class SomethingChangedHook(NotificationHook):
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    __regid__ = 'supervising'
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    __select__ = NotificationHook.__select__ & hook.from_dbapi_query()
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    events = ('before_add_relation', 'before_delete_relation',
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              'after_add_entity', 'before_update_entity')
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    def __call__(self):
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        dest = self._cw.vreg.config['supervising-addrs']
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        if not dest: # no supervisors, don't do this for nothing...
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            return
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        if self._call():
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            SupervisionMailOp(self._cw)
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    def _call(self):
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        event = self.event.split('_', 1)[1]
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        if event == 'update_entity':
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            if self._cw.added_in_transaction(self.entity.eid):
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                return False
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            if self.entity.e_schema == 'CWUser':
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                if not (frozenset(self.entity.cw_edited)
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                        - frozenset(('eid', 'modification_date',
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                                     'last_login_time'))):
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                    # don't record last_login_time update which are done
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                    # automatically at login time
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                    return False
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        self._cw.transaction_data.setdefault('pendingchanges', []).append(
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            (event, self))
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        return True
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class EntityDeleteHook(SomethingChangedHook):
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    __regid__ = 'supervisingentitydel'
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    events = ('before_delete_entity',)
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    def _call(self):
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        try:
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            title = self.entity.dc_title()
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        except Exception:
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            # may raise an error during deletion process, for instance due to
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            # missing required relation
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            title = '#%s' % self.entity.eid
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        self._cw.transaction_data.setdefault('pendingchanges', []).append(
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            ('delete_entity', (self.entity.eid, self.entity.cw_etype, title)))
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        return True