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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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−"""Source to query another RQL repository using pyro"""
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−
+
−__docformat__ = "restructuredtext en"
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−_ = unicode
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−
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−import threading
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−from Pyro.errors import PyroError, ConnectionClosedError
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−
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−from logilab.common.configuration import REQUIRED
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−
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−from cubicweb import dbapi
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−from cubicweb import ConnectionError
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−from cubicweb.server.sources import ConnectionWrapper
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−
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−from cubicweb.server.sources.remoterql import RemoteSource
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−
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−class PyroRQLSource(RemoteSource):
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−    """External repository source, using Pyro connection"""
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−
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−    CNX_TYPE = 'pyro'
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−
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−    options = RemoteSource.options + (
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−        # XXX pyro-ns host/port
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−        ('pyro-ns-id',
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−         {'type' : 'string',
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−          'default': REQUIRED,
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−          'help': 'identifier of the repository in the pyro name server',
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−          'group': 'remote-source', 'level': 0,
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−          }),
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−        ('pyro-ns-host',
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−         {'type' : 'string',
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−          'default': None,
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−          'help': 'Pyro name server\'s host. If not set, default to the value \
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−from all_in_one.conf. It may contains port information using <host>:<port> notation.',
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−          'group': 'remote-source', 'level': 1,
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−          }),
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−        ('pyro-ns-group',
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−         {'type' : 'string',
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−          'default': None,
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−          'help': 'Pyro name server\'s group where the repository will be \
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−registered. If not set, default to the value from all_in_one.conf.',
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−          'group': 'remote-source', 'level': 2,
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−          }),
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−    )
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−
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−    def _get_connection(self):
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−        """open and return a connection to the source"""
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−        nshost = self.config.get('pyro-ns-host') or self.repo.config['pyro-ns-host']
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−        nsgroup = self.config.get('pyro-ns-group') or self.repo.config['pyro-ns-group']
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−        self.info('connecting to instance :%s.%s for user %s',
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−                  nsgroup, self.config['pyro-ns-id'], self.config['cubicweb-user'])
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−        return dbapi.connect(database=self.config['pyro-ns-id'],
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−                             login=self.config['cubicweb-user'],
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−                             password=self.config['cubicweb-password'],
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−                             host=nshost, group=nsgroup,
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−                             setvreg=False)
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−
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−    def get_connection(self):
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−        try:
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−            return self._get_connection()
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−        except (ConnectionError, PyroError), ex:
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−            self.critical("can't get connection to source %s: %s", self.uri, ex)
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−            return ConnectionWrapper()
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−
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−    def check_connection(self, cnx):
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−        """check connection validity, return None if the connection is still valid
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−        else a new connection
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−        """
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−        # we have to transfer manually thread ownership. This can be done safely
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−        # since the connections set holding the connection is affected to one
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−        # session/thread and can't be called simultaneously
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−        try:
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−            cnx._repo._transferThread(threading.currentThread())
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−        except AttributeError:
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−            # inmemory connection
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−            pass
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−        try:
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−            return super(PyroRQLSource, self).check_connection(cnx)
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−        except ConnectionClosedError:
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−            # try to reconnect
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−            return self.get_connection()
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−