sobjects/email.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 06 Aug 2009 09:04:26 +0200
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"""hooks to ensure use_email / primary_email relations consistency
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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.server.hooksmanager import Hook
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from cubicweb.server.pool import PreCommitOperation
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class SetUseEmailRelationOp(PreCommitOperation):
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    """delay this operation to commit to avoid conflict with a late rql query
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    already setting the relation
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    """
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    rtype = 'use_email'
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    fromeid = toeid = None # make pylint happy
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    def condition(self):
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        """check entity has use_email set for the email address"""
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        return not self.session.unsafe_execute(
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            'Any X WHERE X eid %(x)s, X use_email Y, Y eid %(y)s',
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            {'x': self.fromeid, 'y': self.toeid}, 'x')
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    def precommit_event(self):
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        session = self.session
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        if self.condition():
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            session.unsafe_execute(
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                'SET X %s Y WHERE X eid %%(x)s, Y eid %%(y)s' % self.rtype,
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                {'x': self.fromeid, 'y': self.toeid}, 'x')
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class SetPrimaryEmailRelationOp(SetUseEmailRelationOp):
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    rtype = 'primary_email'
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    def condition(self):
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        """check entity has no primary_email set"""
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        return not self.session.unsafe_execute(
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            'Any X WHERE X eid %(x)s, X primary_email Y',
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            {'x': self.fromeid}, 'x')
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class SetPrimaryEmailHook(Hook):
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    """notify when a bug or story or version has its state modified"""
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    events = ('after_add_relation',)
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    accepts = ('use_email',)
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    def call(self, session, fromeid, rtype, toeid):
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        subjtype = session.describe(fromeid)[0]
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        eschema = self.vreg.schema[subjtype]
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        if 'primary_email' in eschema.subject_relations():
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            SetPrimaryEmailRelationOp(session, vreg=self.vreg,
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                                      fromeid=fromeid, toeid=toeid)
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class SetUseEmailHook(Hook):
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    """notify when a bug or story or version has its state modified"""
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    events = ('after_add_relation',)
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    accepts = ('primary_email',)
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    def call(self, session, fromeid, rtype, toeid):
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        subjtype = session.describe(fromeid)[0]
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        eschema = self.vreg.schema[subjtype]
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        if 'use_email' in eschema.subject_relations():
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            SetUseEmailRelationOp(session, vreg=self.vreg,
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                                  fromeid=fromeid, toeid=toeid)