hooks/zmq.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 24 Sep 2015 11:26:11 +0200
changeset 10921 977def81780a
parent 10907 9ae707db5265
permissions -rw-r--r--
[migration] don't handle data deletion anymore on schema changes In most cases when we want to drop some entity/relation type, we don't care whether hooks are called on their deletion. There is even low chances that some hooks still exists, based on an old version of the schema. Last but not least, this is horribly inefficient. So this should be clearly documented and handled by application's programmer if desired. This patch removes unnecessary deletion (because table or column will be later dropped) and reimplements the case of partial deletion (only one relation definition among several, hence the database structure isn't modified) using sql. Only one test regarding deletion of inlined relation def is added as other cases seem to be covered by existing tests. Closes #7023315

# -*- coding: utf-8 -*-
# copyright 2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

from cubicweb.server import hook

class ZMQStopHook(hook.Hook):
    __regid__ = 'zmqstop'
    events = ('server_shutdown',)

    def __call__(self):
        self.repo.app_instances_bus.stop()

class ZMQStartHook(hook.Hook):
    __regid__ = 'zmqstart'
    events = ('server_startup',)
    order = -1

    def __call__(self):
        config = self.repo.config
        address_pub = config.get('zmq-address-pub')
        address_sub = config.get('zmq-address-sub')
        if not address_pub and not address_sub:
            return
        from cubicweb.server import cwzmq
        self.repo.app_instances_bus = cwzmq.ZMQComm()
        if address_pub:
            self.repo.app_instances_bus.add_publisher(address_pub)
        def clear_cache_callback(msg):
            self.debug('clear_caches: %s', ' '.join(msg))
            self.repo.clear_caches(msg[1:])
        self.repo.app_instances_bus.add_subscription('delete', clear_cache_callback)
        for address in address_sub:
            self.repo.app_instances_bus.add_subscriber(address)
        self.repo.app_instances_bus.start()