transaction.py
author Pierre-Yves David <pierre-yves.david@logilab.fr>
Tue, 25 Jun 2013 11:06:57 +0200
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child 10235 684215aca046
permissions -rw-r--r--
[repoapi] introduce a basic ClientConnection class This is the new official way to access the repo from client side. It still access Session object directly as the server side connection is not up yet (and it's not up because it would have no user). Multiple follow up commit will install compatibility with the DBAPI. This will ease the migration from dbapi to repoapi. ClientConnection has no user yet but later commit will use it in the whole Web stack. related to #2503918
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# copyright 2003-2012 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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This module is in the cubicweb package and not in cubicweb.server because those
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objects should be accessible to client through pyro, where the cubicweb.server
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package may not be installed.
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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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(RepositoryError, 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, uuid, time, ueid):
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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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        # should be set by the dbapi connection
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        self.req = None  # old style
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        self.cnx = None  # new style
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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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        if self.req is None:
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            execute = self.cnx.execute
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        else:
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            execute = self.req
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        return 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._execute('Any X WHERE X eid %(x)s',
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                             {'x': self.user_eid}).get_entity(0, 0)
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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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        if self.req is not None:
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            cnx = self.req.cnx
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        else:
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            cnx = self.cnx
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        return 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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        AbstractAction.__init__(self, 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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        AbstractAction.__init__(self, 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