# copyright 2003-2015 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb. If not, see <http://www.gnu.org/licenses/>.
"""some hooks to handle notification on entity's changes"""
__docformat__ = "restructuredtext en"
from logilab.common.textutils import normalize_text
from logilab.common.deprecation import deprecated
from cubicweb import RegistryNotFound
from cubicweb.predicates import is_instance
from cubicweb.server import hook
from cubicweb.sobjects.supervising import SupervisionMailOp
@deprecated('[3.17] use notify_on_commit instead')
def RenderAndSendNotificationView(cnx, view, viewargs=None):
notify_on_commit(cnx, view, viewargs)
[docs]def notify_on_commit(cnx, view, viewargs=None):
"""register a notification view (see
:class:`~cubicweb.sobjects.notification.NotificationView`) to be sent at
post-commit time, ie only if the transaction has succeeded.
`viewargs` is an optional dictionary containing extra argument to be given
to :meth:`~cubicweb.sobjects.notification.NotificationView.render_and_send`
"""
if viewargs is None:
viewargs = {}
notif_op = _RenderAndSendNotificationOp.get_instance(cnx)
notif_op.add_data((view, viewargs))
class _RenderAndSendNotificationOp(hook.DataOperationMixIn, hook.Operation):
"""End of the notification chain. Do render and send views after commit
All others Operations end up adding data to this Operation.
The notification are done on ``postcommit_event`` to make sure to prevent
sending notification about rolled back data.
"""
containercls = list
def postcommit_event(self):
deleted = self.cnx.deleted_in_transaction
for view, viewargs in self.get_data():
if view.cw_rset is not None:
if not view.cw_rset:
# entity added and deleted in the same transaction
# (cache effect)
continue
elif deleted(view.cw_rset[view.cw_row or 0][view.cw_col or 0]):
# entity added and deleted in the same transaction
continue
try:
view.render_and_send(**viewargs)
except Exception:
# error in post commit are not propagated
# We keep this logic here to prevent a small notification error
# to prevent them all.
self.exception('Notification failed')
class NotificationHook(hook.Hook):
__abstract__ = True
category = 'notification'
def select_view(self, vid, rset, row=0, col=0):
try:
return self._cw.vreg['views'].select_or_none(vid, self._cw, rset=rset,
row=row, col=col)
except RegistryNotFound: # can happen in some config
# (e.g. repo only config with no
# notification views registered by
# the instance's cubes)
return None
class StatusChangeHook(NotificationHook):
"""notify when a workflowable entity has its state modified"""
__regid__ = 'notifystatuschange'
__select__ = NotificationHook.__select__ & is_instance('TrInfo')
events = ('after_add_entity',)
def __call__(self):
entity = self.entity
if not entity.from_state: # not a transition
return
rset = entity.related('wf_info_for')
view = self.select_view('notif_status_change', rset=rset, row=0)
if view is None:
return
comment = entity.printable_value('comment', format='text/plain')
# XXX don't try to wrap rest until we've a proper transformation (see
# #103822)
if comment and entity.comment_format != 'text/rest':
comment = normalize_text(comment, 80)
viewargs = {'comment': comment,
'previous_state': entity.previous_state.name,
'current_state': entity.new_state.name}
notify_on_commit(self._cw, view, viewargs=viewargs)
class RelationChangeHook(NotificationHook):
__regid__ = 'notifyrelationchange'
events = ('before_add_relation', 'after_add_relation',
'before_delete_relation', 'after_delete_relation')
def __call__(self):
"""if a notification view is defined for the event, send notification
email defined by the view
"""
rset = self._cw.eid_rset(self.eidfrom)
view = self.select_view('notif_%s_%s' % (self.event, self.rtype),
rset=rset, row=0)
if view is None:
return
notify_on_commit(self._cw, view)
class EntityChangeHook(NotificationHook):
"""if a notification view is defined for the event, send notification
email defined by the view
"""
__regid__ = 'notifyentitychange'
events = ('after_add_entity', 'after_update_entity')
def __call__(self):
rset = self.entity.as_rset()
view = self.select_view('notif_%s' % self.event, rset=rset, row=0)
if view is None:
return
notify_on_commit(self._cw, view)
class EntityUpdatedNotificationOp(hook.SingleLastOperation):
"""scrap all changed entity to prepare a Notification Operation for them"""
def precommit_event(self):
# precommit event that creates postcommit operation
cnx = self.cnx
for eid in cnx.transaction_data['changes']:
view = cnx.vreg['views'].select('notif_entity_updated', cnx,
rset=cnx.eid_rset(eid),
row=0)
notify_on_commit(self.cnx, view,
viewargs={'changes': cnx.transaction_data['changes'][eid]})
class EntityUpdateHook(NotificationHook):
__regid__ = 'notifentityupdated'
__abstract__ = True # do not register by default
__select__ = NotificationHook.__select__ & hook.issued_from_user_query()
events = ('before_update_entity',)
skip_attrs = set(['modification_date'])
def __call__(self):
cnx = self._cw
if cnx.added_in_transaction(self.entity.eid):
return # entity is being created
# then compute changes
attrs = [k for k in self.entity.cw_edited
if not k in self.skip_attrs]
if not attrs:
return
changes = cnx.transaction_data.setdefault('changes', {})
thisentitychanges = changes.setdefault(self.entity.eid, set())
rqlsel, rqlrestr = [], ['X eid %(x)s']
for i, attr in enumerate(attrs):
var = chr(65+i)
rqlsel.append(var)
rqlrestr.append('X %s %s' % (attr, var))
rql = 'Any %s WHERE %s' % (','.join(rqlsel), ','.join(rqlrestr))
rset = cnx.execute(rql, {'x': self.entity.eid})
for i, attr in enumerate(attrs):
oldvalue = rset[0][i]
newvalue = self.entity.cw_edited[attr]
if oldvalue != newvalue:
thisentitychanges.add((attr, oldvalue, newvalue))
if thisentitychanges:
EntityUpdatedNotificationOp(cnx)
# supervising ##################################################################
class SomethingChangedHook(NotificationHook):
__regid__ = 'supervising'
__select__ = NotificationHook.__select__ & hook.issued_from_user_query()
events = ('before_add_relation', 'before_delete_relation',
'after_add_entity', 'before_update_entity')
def __call__(self):
dest = self._cw.vreg.config['supervising-addrs']
if not dest: # no supervisors, don't do this for nothing...
return
if self._call():
SupervisionMailOp(self._cw)
def _call(self):
event = self.event.split('_', 1)[1]
if event == 'update_entity':
if self._cw.added_in_transaction(self.entity.eid):
return False
if self.entity.e_schema == 'CWUser':
if not (frozenset(self.entity.cw_edited)
- frozenset(('eid', 'modification_date',
'last_login_time'))):
# don't record last_login_time update which are done
# automatically at login time
return False
self._cw.transaction_data.setdefault('pendingchanges', []).append(
(event, self))
return True
class EntityDeleteHook(SomethingChangedHook):
__regid__ = 'supervisingentitydel'
events = ('before_delete_entity',)
def _call(self):
try:
title = self.entity.dc_title()
except Exception:
# may raise an error during deletion process, for instance due to
# missing required relation
title = '#%s' % self.entity.eid
self._cw.transaction_data.setdefault('pendingchanges', []).append(
('delete_entity', (self.entity.eid, self.entity.cw_etype, title)))
return True
