transaction.py
author Rémi Cardona <remi.cardona@logilab.fr>
Mon, 21 Sep 2015 17:51:58 +0200
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[migration] NoneType is no longer comparable in py3k
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# copyright 2003-2014 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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""" undoable transaction objects. """
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__docformat__ = "restructuredtext en"
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from cubicweb import _
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from cubicweb import RepositoryError
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ACTION_LABELS = {
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    'C': _('entity creation'),
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    'U': _('entity update'),
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    'D': _('entity deletion'),
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    'A': _('relation add'),
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    'R': _('relation removal'),
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    }
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class NoSuchTransaction(RepositoryError):
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    # Used by CubicWebException
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    msg = _("there is no transaction #%s")
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    def __init__(self, txuuid):
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        super(NoSuchTransaction, self).__init__(txuuid)
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        self.txuuid = txuuid
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class Transaction(object):
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    """an undoable transaction"""
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    def __init__(self, cnx, uuid, time, ueid):
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        self.cnx = cnx
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        self.uuid = uuid
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        self.datetime = time
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        self.user_eid = ueid
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    def _execute(self, *args, **kwargs):
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        """execute a query using either the req or the cnx"""
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        return self.cnx.execute(*args, **kwargs)
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    def __repr__(self):
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        return '<Transaction %s by %s on %s>' % (
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            self.uuid, self.user_eid, self.datetime)
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    def user(self):
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        """return the user entity which has done the transaction,
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        none if not found.
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        """
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        return self.cnx.find('CWUser', eid=self.user_eid).one()
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    def actions_list(self, public=True):
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        """return an ordered list of action effectued during that transaction
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        if public is true, return only 'public' action, eg not ones triggered
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        under the cover by hooks.
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        """
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        return self.cnx.transaction_actions(self.uuid, public)
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class AbstractAction(object):
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    def __init__(self, action, public, order):
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        self.action = action
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        self.public = public
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        self.order = order
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    @property
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    def label(self):
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        return ACTION_LABELS[self.action]
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    @property
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    def ertype(self):
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        """ Return the entity or relation type this action is related to"""
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        raise NotImplementedError(self)
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class EntityAction(AbstractAction):
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    def __init__(self, action, public, order, etype, eid, changes):
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        super(EntityAction, self).__init__(action, public, order)
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        self.etype = etype
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        self.eid = eid
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        self.changes = changes
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    def __repr__(self):
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        return '<%s: %s %s (%s)>' % (
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            self.label, self.eid, self.changes,
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            self.public and 'dbapi' or 'hook')
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    @property
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    def ertype(self):
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        """ Return the entity or relation type this action is related to"""
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        return self.etype
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class RelationAction(AbstractAction):
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    def __init__(self, action, public, order, rtype, eidfrom, eidto):
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        super(RelationAction, self).__init__(action, public, order)
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        self.rtype = rtype
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        self.eid_from = eidfrom
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        self.eid_to = eidto
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    def __repr__(self):
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        return '<%s: %s %s %s (%s)>' % (
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            self.label, self.eid_from, self.rtype, self.eid_to,
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            self.public and 'dbapi' or 'hook')
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    @property
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    def ertype(self):
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        """ Return the entity or relation type this action is related to"""
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        return self.rtype