"""some hooks and views to handle supervising of any data changes
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
from cubicweb import UnknownEid
from cubicweb.selectors import none_rset
from cubicweb.view import Component
from cubicweb.common.mail import format_mail
from cubicweb.server.hooksmanager import Hook
from cubicweb.server.hookhelper import SendMailOp
class SomethingChangedHook(Hook):
events = ('before_add_relation', 'before_delete_relation',
'after_add_entity', 'before_update_entity')
accepts = ('Any',)
def call(self, session, *args):
dest = self.config['supervising-addrs']
if not dest: # no supervisors, don't do this for nothing...
return
self.session = session
if self._call(*args):
SupervisionMailOp(session)
def _call(self, *args):
if self._event() == 'update_entity' and args[0].e_schema == 'CWUser':
updated = set(args[0].iterkeys())
if not (updated - frozenset(('eid', 'modification_date', 'last_login_time'))):
# don't record last_login_time update which are done
# automatically at login time
return False
self.session.transaction_data.setdefault('pendingchanges', []).append(
(self._event(), args))
return True
def _event(self):
return self.event.split('_', 1)[1]
class EntityDeleteHook(SomethingChangedHook):
events = ('before_delete_entity',)
def _call(self, eid):
entity = self.session.entity(eid)
try:
title = entity.dc_title()
except:
# may raise an error during deletion process, for instance due to
# missing required relation
title = '#%s' % eid
self.session.transaction_data.setdefault('pendingchanges', []).append(
('delete_entity', (eid, str(entity.e_schema), title)))
return True
def filter_changes(changes):
"""
* when an entity has been deleted:
* don't show deletion of its relations
* don't show related TrInfo deletion if any
* when an entity has been added don't show owned_by relation addition
* don't show new TrInfo entities if any
"""
# first build an index of changes
index = {}
added, deleted = set(), set()
for change in changes[:]:
event, changedescr = change
if event == 'add_entity':
entity = changedescr[0]
added.add(entity.eid)
if entity.e_schema == 'TrInfo':
changes.remove(change)
if entity.from_state:
try:
changes.remove( ('delete_relation',
(entity.wf_info_for[0].eid, 'in_state',
entity.from_state[0].eid)) )
except ValueError:
pass
try:
changes.remove( ('add_relation',
(entity.wf_info_for[0].eid, 'in_state',
entity.to_state[0].eid)) )
except ValueError:
pass
event = 'change_state'
change = (event,
(entity.wf_info_for[0],
entity.from_state[0], entity.to_state[0]))
changes.append(change)
elif event == 'delete_entity':
deleted.add(changedescr[0])
index.setdefault(event, set()).add(change)
# filter changes
for eid in added:
try:
for change in index['add_relation'].copy():
changedescr = change[1]
# skip meta-relations which are set automatically
# XXX generate list below using rtags (category = 'generated')
if changedescr[1] in ('created_by', 'owned_by', 'is', 'is_instance_of',
'from_state', 'to_state', 'wf_info_for',) \
and changedescr[0] == eid:
index['add_relation'].remove(change)
# skip in_state relation if the entity is being created
# XXX this may be automatized by skipping all mandatory relation
# at entity creation time
elif changedescr[1] == 'in_state' and changedescr[0] in added:
index['add_relation'].remove(change)
except KeyError:
break
for eid in deleted:
try:
for change in index['delete_relation'].copy():
fromeid, rtype, toeid = change[1]
if fromeid == eid:
index['delete_relation'].remove(change)
elif toeid == eid:
index['delete_relation'].remove(change)
if rtype == 'wf_info_for':
for change in index['delete_entity'].copy():
if change[1][0] == fromeid:
index['delete_entity'].remove(change)
except KeyError:
break
for change in changes:
event, changedescr = change
if change in index[event]:
yield change
class SupervisionEmailView(Component):
"""view implementing the email API for data changes supervision notification
"""
__select__ = none_rset()
id = 'supervision_notif'
def recipients(self):
return self.config['supervising-addrs']
def subject(self):
return self.req._('[%s supervision] changes summary') % self.config.appid
def call(self, changes):
user = self.req.actual_session().user
self.w(self.req._('user %s has made the following change(s):\n\n')
% user.login)
for event, changedescr in filter_changes(changes):
self.w(u'* ')
getattr(self, event)(*changedescr)
self.w(u'\n\n')
def _entity_context(self, entity):
return {'eid': entity.eid,
'etype': entity.dc_type().lower(),
'title': entity.dc_title()}
def add_entity(self, entity):
msg = self.req._('added %(etype)s #%(eid)s (%(title)s)')
self.w(u'%s\n' % (msg % self._entity_context(entity)))
self.w(u' %s' % entity.absolute_url())
def update_entity(self, entity):
msg = self.req._('updated %(etype)s #%(eid)s (%(title)s)')
self.w(u'%s\n' % (msg % self._entity_context(entity)))
# XXX print changes
self.w(u' %s' % entity.absolute_url())
def delete_entity(self, eid, etype, title):
msg = self.req._('deleted %(etype)s #%(eid)s (%(title)s)')
etype = display_name(self.req, etype).lower()
self.w(msg % locals())
def change_state(self, entity, fromstate, tostate):
msg = self.req._('changed state of %(etype)s #%(eid)s (%(title)s)')
self.w(u'%s\n' % (msg % self._entity_context(entity)))
self.w(_(' from state %(fromstate)s to state %(tostate)s\n' %
{'fromstate': _(fromstate.name), 'tostate': _(tostate.name)}))
self.w(u' %s' % entity.absolute_url())
def _relation_context(self, fromeid, rtype, toeid):
_ = self.req._
session = self.req.actual_session()
def describe(eid):
try:
return _(session.describe(eid)[0]).lower()
except UnknownEid:
# may occurs when an entity has been deleted from an external
# source and we're cleaning its relation
return _('unknown external entity')
return {'rtype': _(rtype),
'fromeid': fromeid,
'frometype': describe(fromeid),
'toeid': toeid,
'toetype': describe(toeid)}
def add_relation(self, fromeid, rtype, toeid):
msg = self.req._('added relation %(rtype)s from %(frometype)s #%(fromeid)s to %(toetype)s #%(toeid)s')
self.w(msg % self._relation_context(fromeid, rtype, toeid))
def delete_relation(self, fromeid, rtype, toeid):
msg = self.req._('deleted relation %(rtype)s from %(frometype)s #%(fromeid)s to %(toetype)s #%(toeid)s')
self.w(msg % self._relation_context(fromeid, rtype, toeid))
class SupervisionMailOp(SendMailOp):
"""special send email operation which should be done only once for a bunch
of changes
"""
def _get_view(self):
return self.session.vreg.select_component('supervision_notif',
self.session, None)
def _prepare_email(self):
session = self.session
config = session.vreg.config
uinfo = {'email': config['sender-addr'],
'name': config['sender-name']}
view = self._get_view()
content = view.render(changes=session.transaction_data.get('pendingchanges'))
recipients = view.recipients()
msg = format_mail(uinfo, recipients, content, view.subject(), config=config)
self.to_send = [(msg, recipients)]
def commit_event(self):
self._prepare_email()
SendMailOp.commit_event(self)