sobjects/supervising.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 23 Sep 2009 13:42:48 +0200
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child 3429 531395cb5a22
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state_of/transition_of could now be inlined
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"""some hooks and views to handle supervising of any data 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 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.common.mail import format_mail
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from cubicweb.server.hookhelper 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.eidfrom == eid:
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                    index['delete_relation'].remove(change)
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                elif change.eidto == eid:
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                    index['delete_relation'].remove(change)
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                    if change.rtype == 'wf_info_for':
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                        for change_ in index['delete_entity'].copy():
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                            if change_[1].eidfrom == change.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.config['supervising-addrs']
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    def subject(self):
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        return self.req._('[%s supervision] changes summary') % self.config.appid
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    def call(self, changes):
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        user = self.req.actual_session().user
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        self.w(self.req._('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.req._('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.req._('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.req._('deleted %(etype)s #%(eid)s (%(title)s)')
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        etype = display_name(self.req, 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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        msg = self.req._('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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        _ = self.req._
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        session = self.req.actual_session()
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        def describe(eid):
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            try:
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                return _(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 _('unknown external entity')
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        eidfrom, rtype, eidto = changedescr.eidfrom, changedescr.rtype, changedescr.eidto
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        return {'rtype': _(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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   147
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    def add_relation(self, changedescr):
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        msg = self.req._('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, eidfrom, rtype, eidto):
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        msg = self.req._('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 commit_event(self):
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        self._prepare_email()
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        SendMailOp.commit_event(self)