sobjects/supervising.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 22 Sep 2011 16:12:23 +0200
changeset 7827 9bbf83f68bcc
parent 6582 8eb7883b4223
child 8190 2a3c1b787688
permissions -rw-r--r--
[entity] upgrade fetch_[unrelated_]order to benefit from changes introduced in 3.14 (closes #1942758) of rql generation parts of the ORM now based on rql syntax tree. This allows more powerful and flexible sort control by giving them the syntax tree instead of manipulating string. Also: * prefix new methods by 'cw_' * fix cases that currently crash in 3.14 due to the refactoring
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# copyright 2003-2010 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 and views to handle supervising of any data changes"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from cubicweb import UnknownEid
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from cubicweb.selectors import none_rset
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from cubicweb.schema import display_name
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from cubicweb.view import Component
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from cubicweb.mail import format_mail
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from cubicweb.server.hook import SendMailOp
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def filter_changes(changes):
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    """
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    * when an entity has been deleted:
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      * don't show deletion of its relations
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      * don't show related TrInfo deletion if any
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    * when an entity has been added don't show owned_by relation addition
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    * don't show new TrInfo entities if any
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    """
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    # first build an index of changes
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    index = {}
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    added, deleted = set(), set()
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    for change in changes[:]:
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        event, changedescr = change
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        if event == 'add_entity':
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            entity = changedescr.entity
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            added.add(entity.eid)
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            if entity.e_schema == 'TrInfo':
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                changes.remove(change)
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                event = 'change_state'
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                change = (event,
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                          (entity.wf_info_for[0],
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                           entity.from_state[0], entity.to_state[0]))
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                changes.append(change)
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        elif event == 'delete_entity':
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            deleted.add(changedescr[0])
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        index.setdefault(event, set()).add(change)
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    for key in ('delete_relation', 'add_relation'):
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        for change in index.get(key, {}).copy():
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            if change[1].rtype == 'in_state':
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                index[key].remove(change)
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    # filter changes
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    for eid in added:
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        try:
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            for change in index['add_relation'].copy():
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                changedescr = change[1]
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                # skip meta-relations which are set automatically
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                # XXX generate list below using rtags (category = 'generated')
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                if changedescr.rtype in ('created_by', 'owned_by', 'is', 'is_instance_of',
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                                      'from_state', 'to_state', 'by_transition',
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                                      'wf_info_for') \
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                       and changedescr.eidfrom == eid:
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                    index['add_relation'].remove(change)
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        except KeyError:
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            break
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    for eid in deleted:
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        try:
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            for change in index['delete_relation'].copy():
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                if change[1].eidfrom == eid:
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                    index['delete_relation'].remove(change)
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                elif change[1].eidto == eid:
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                    index['delete_relation'].remove(change)
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                    if change[1].rtype == 'wf_info_for':
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                        for change_ in index['delete_entity'].copy():
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                            if change_[1].eidfrom == change[1].eidfrom:
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                                index['delete_entity'].remove(change_)
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        except KeyError:
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            break
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    for change in changes:
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        event, changedescr = change
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        if change in index[event]:
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            yield change
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class SupervisionEmailView(Component):
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    """view implementing the email API for data changes supervision notification
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    """
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    __regid__ = 'supervision_notif'
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    __select__ = none_rset()
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    def recipients(self):
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        return self._cw.vreg.config['supervising-addrs']
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    def subject(self):
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        return self._cw._('[%s supervision] changes summary') % self._cw.vreg.config.appid
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    def call(self, changes):
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        user = self._cw.user
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        self.w(self._cw._('user %s has made the following change(s):\n\n')
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               % user.login)
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        for event, changedescr in filter_changes(changes):
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            self.w(u'* ')
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            getattr(self, event)(changedescr)
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            self.w(u'\n\n')
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    def _entity_context(self, entity):
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        return {'eid': entity.eid,
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                'etype': entity.dc_type().lower(),
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                'title': entity.dc_title()}
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    def add_entity(self, changedescr):
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        msg = self._cw._('added %(etype)s #%(eid)s (%(title)s)')
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        self.w(u'%s\n' % (msg % self._entity_context(changedescr.entity)))
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        self.w(u'  %s' % changedescr.entity.absolute_url())
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    def update_entity(self, changedescr):
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        msg = self._cw._('updated %(etype)s #%(eid)s (%(title)s)')
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        self.w(u'%s\n' % (msg % self._entity_context(changedescr.entity)))
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        # XXX print changes
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        self.w(u'  %s' % changedescr.entity.absolute_url())
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    def delete_entity(self, (eid, etype, title)):
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        msg = self._cw._('deleted %(etype)s #%(eid)s (%(title)s)')
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        etype = display_name(self._cw, etype).lower()
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        self.w(msg % locals())
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    def change_state(self, (entity, fromstate, tostate)):
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        _ = self._cw._
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        msg = _('changed state of %(etype)s #%(eid)s (%(title)s)')
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        self.w(u'%s\n' % (msg % self._entity_context(entity)))
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        self.w(_('  from state %(fromstate)s to state %(tostate)s\n' %
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                 {'fromstate': _(fromstate.name), 'tostate': _(tostate.name)}))
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        self.w(u'  %s' % entity.absolute_url())
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    def _relation_context(self, changedescr):
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        session = self._cw
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        def describe(eid):
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            try:
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                return session._(session.describe(eid)[0]).lower()
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            except UnknownEid:
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                # may occurs when an entity has been deleted from an external
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                # source and we're cleaning its relation
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                return session._('unknown external entity')
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        eidfrom, rtype, eidto = changedescr.eidfrom, changedescr.rtype, changedescr.eidto
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        return {'rtype': session._(rtype),
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                'eidfrom': eidfrom,
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                'frometype': describe(eidfrom),
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                'eidto': eidto,
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                'toetype': describe(eidto)}
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    def add_relation(self, changedescr):
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        msg = self._cw._('added relation %(rtype)s from %(frometype)s #%(eidfrom)s to %(toetype)s #%(eidto)s')
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        self.w(msg % self._relation_context(changedescr))
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    def delete_relation(self, changedescr):
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        msg = self._cw._('deleted relation %(rtype)s from %(frometype)s #%(eidfrom)s to %(toetype)s #%(eidto)s')
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        self.w(msg % self._relation_context(changedescr))
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class SupervisionMailOp(SendMailOp):
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    """special send email operation which should be done only once for a bunch
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    of changes
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    """
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    def _get_view(self):
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        return self.session.vreg['components'].select('supervision_notif',
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                                                      self.session)
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    def _prepare_email(self):
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        session = self.session
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        config = session.vreg.config
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        uinfo = {'email': config['sender-addr'],
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                 'name': config['sender-name']}
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        view = self._get_view()
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        content = view.render(changes=session.transaction_data.get('pendingchanges'))
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        recipients = view.recipients()
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        msg = format_mail(uinfo, recipients, content, view.subject(), config=config)
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        self.to_send = [(msg, recipients)]
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    def postcommit_event(self):
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        self._prepare_email()
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        SendMailOp.postcommit_event(self)