server/hookhelper.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Thu, 14 May 2009 11:38:40 +0200
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"""helper functions for application hooks
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:organization: Logilab
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:copyright: 2001-2009 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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__docformat__ = "restructuredtext en"
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from smtplib import SMTP
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from threading import Lock
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from cubicweb import RepositoryError
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from cubicweb.server.pool import SingleLastOperation
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def entity_name(session, eid):
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    """return the "name" attribute of the entity with the given eid"""
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    return entity_attr(session, eid, 'name')
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def entity_attr(session, eid, attr):
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    """return an arbitrary attribute of the entity with the given eid"""
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    rset = session.execute('Any N WHERE X eid %%(x)s, X %s N' % attr,
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                           {'x': eid}, 'x')
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    return rset[0][0]
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def rproperty(session, rtype, eidfrom, eidto, rprop):
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    rschema = session.repo.schema[rtype]
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    subjtype = session.describe(eidfrom)[0]
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    objtype = session.describe(eidto)[0]
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    return rschema.rproperty(subjtype, objtype, rprop)
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def check_internal_entity(session, eid, internal_names):
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    """check that the entity's name is not in the internal_names list.
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    raise a RepositoryError if so, else return the entity's name
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    """
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    name = entity_name(session, eid)
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    if name in internal_names:
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        raise RepositoryError('%s entity can\'t be deleted' % name)
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    return name
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def get_user_sessions(repo, ueid):
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    for session in repo._sessions.values():
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        if ueid == session.user.eid:
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            yield session
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# mail related ################################################################
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SMTP_LOCK = Lock()
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class SendMailOp(SingleLastOperation):
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    def __init__(self, session, msg=None, recipients=None, **kwargs):
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        # may not specify msg yet, as
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        # `cubicweb.sobjects.supervision.SupervisionMailOp`
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        if msg is not None:
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            assert recipients
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            self.to_send = [(msg, recipients)]
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        else:
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            assert recipients is None
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            self.to_send = []
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        super(SendMailOp, self).__init__(session, **kwargs)
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    def register(self, session):
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        previous = super(SendMailOp, self).register(session)
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        if previous:
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            self.to_send = previous.to_send + self.to_send
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    def commit_event(self):
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        self.repo.threaded_task(self.sendmails)
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    def sendmails(self):
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        server, port = self.config['smtp-host'], self.config['smtp-port']
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        SMTP_LOCK.acquire()
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        try:
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            try:
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                smtp = SMTP(server, port)
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            except Exception, ex:
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                self.exception("can't connect to smtp server %s:%s (%s)",
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                               server, port, ex)
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                return
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            heloaddr = '%s <%s>' % (self.config['sender-name'],
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                                    self.config['sender-addr'])
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            for msg, recipients in self.to_send:
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                try:
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                    smtp.sendmail(heloaddr, recipients, msg.as_string())
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                except Exception, ex:
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                    self.exception("error sending mail to %s (%s)",
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                                   recipients, ex)
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            smtp.close()
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        finally:
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            SMTP_LOCK.release()
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# state related ###############################################################
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def previous_state(session, eid):
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    """return the state of the entity with the given eid,
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    usually since it's changing in the current transaction. Due to internal
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    relation hooks, the relation may has been deleted at this point, so
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    we have handle that
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    """
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    for eidfrom, rtype, eidto in reversed(session.query_data('pendingrelations', ())):
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        if rtype == 'in_state' and eidfrom == eid:
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            rset = session.execute('Any S,N WHERE S eid %(x)s, S name N',
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                                   {'x': eidto}, 'x')
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            return rset.get_entity(0, 0)
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    rset = session.execute('Any S,N WHERE X eid %(x)s, X in_state S, S name N',
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                           {'x': eid}, 'x')
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    if rset:
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        return rset.get_entity(0, 0)