hooks/notification.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Tue, 18 Aug 2009 09:13:12 +0200
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api update
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"""some hooks to handle notification on entity's changes
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from logilab.common.textutils import normalize_text
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from cubicweb import RegistryException
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from cubicweb.selectors import entity_implements
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from cubicweb.server import hook
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class RenderAndSendNotificationView(hook.Operation):
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    """delay rendering of notification view until precommit"""
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    def precommit_event(self):
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        view = self.view
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        if view.cw_rset and self.session.deleted_in_transaction(view.cw_rset[cw_rset.cw_row or 0][cw_rset.cw_col or 0]):
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            return # entity added and deleted in the same transaction
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        self.view.render_and_send(**getattr(self, 'viewargs', {}))
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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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        return self._cw.vreg['views'].select_or_none(vid, self._cw,
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                                                     rset=rset, row=0, col=0)
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class StatusChangeHook(NotificationHook):
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    """notify when a workflowable entity has its state modified"""
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    __id__ = 'notifystatuschange'
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    __select__ = NotificationHook.__select__ & entity_implements('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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        if comment:
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            comment = normalize_text(comment, 80,
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                                     rest=entity.comment_format=='text/rest')
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        RenderAndSendNotificationView(self._cw, view=view, viewargs={
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            'comment': comment, 'previous_state': entity.previous_state.name,
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            'current_state': entity.new_state.name})
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class RelationChangeHook(NotificationHook):
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    __id__ = '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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        RenderAndSendNotificationView(self._cw, view=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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    __id__ = '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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        RenderAndSendNotificationView(self._cw, view=view)
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# supervising ##################################################################
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class SomethingChangedHook(NotificationHook):
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    __id__ = 'supervising'
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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 (self.entity.edited_attributes - 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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    __id__ = '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:
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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' % eid
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        self._cw.transaction_data.setdefault('pendingchanges', []).append(
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            ('delete_entity', (self.eid, str(self.entity.e_schema), title)))
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        return True