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# Copyright 2015-2016 Mirantis, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import logging
from oslo_messaging._drivers.zmq_driver.proxy.central \
import zmq_publisher_proxy
from oslo_messaging._drivers.zmq_driver.proxy \
import zmq_base_proxy
from oslo_messaging._drivers.zmq_driver.proxy import zmq_sender
from oslo_messaging._drivers.zmq_driver import zmq_async
from oslo_messaging._drivers.zmq_driver import zmq_names
from oslo_messaging._drivers.zmq_driver import zmq_updater
from oslo_messaging._i18n import _LI
LOG = logging.getLogger(__name__)
zmq = zmq_async.import_zmq()
class SingleRouterProxy(zmq_base_proxy.ProxyBase):
PROXY_TYPE = "ROUTER"
def __init__(self, conf, context, matchmaker):
super(SingleRouterProxy, self).__init__(conf, context, matchmaker)
port = conf.zmq_proxy_opts.frontend_port
self.fe_router_socket = zmq_base_proxy.create_socket(
conf, context, port, zmq.ROUTER)
self.poller.register(self.fe_router_socket, self._receive_message)
self.publisher = zmq_publisher_proxy.PublisherProxy(conf, matchmaker)
self.router_sender = zmq_sender.CentralRouterSender()
self.ack_sender = zmq_sender.CentralAckSender()
self._router_updater = self._create_router_updater()
def run(self):
message, socket = self.poller.poll()
if message is None:
return
message_type = int(message[zmq_names.MESSAGE_TYPE_IDX])
if self.conf.oslo_messaging_zmq.use_pub_sub and \
message_type in zmq_names.MULTISEND_TYPES:
self.publisher.send_request(message)
if socket is self.fe_router_socket and \
self.conf.zmq_proxy_opts.ack_pub_sub:
self.ack_sender.send_message(socket, message)
else:
self.router_sender.send_message(
self._get_socket_to_dispatch_on(socket), message)
def _create_router_updater(self):
return RouterUpdater(
self.conf, self.matchmaker, self.publisher.host,
self.fe_router_socket.connect_address,
self.fe_router_socket.connect_address)
def _get_socket_to_dispatch_on(self, socket):
return self.fe_router_socket
def cleanup(self):
super(SingleRouterProxy, self).cleanup()
self._router_updater.cleanup()
self.fe_router_socket.close()
self.publisher.cleanup()
class DoubleRouterProxy(SingleRouterProxy):
PROXY_TYPE = "ROUTER-ROUTER"
def __init__(self, conf, context, matchmaker):
port = conf.zmq_proxy_opts.backend_port
self.be_router_socket = zmq_base_proxy.create_socket(
conf, context, port, zmq.ROUTER)
super(DoubleRouterProxy, self).__init__(conf, context, matchmaker)
self.poller.register(self.be_router_socket, self._receive_message)
def _create_router_updater(self):
return RouterUpdater(
self.conf, self.matchmaker, self.publisher.host,
self.fe_router_socket.connect_address,
self.be_router_socket.connect_address)
def _get_socket_to_dispatch_on(self, socket):
return self.be_router_socket \
if socket is self.fe_router_socket \
else self.fe_router_socket
def cleanup(self):
super(DoubleRouterProxy, self).cleanup()
self.be_router_socket.close()
class RouterUpdater(zmq_updater.UpdaterBase):
"""This entity performs periodic async updates
from router proxy to the matchmaker.
"""
def __init__(self, conf, matchmaker, publisher_address, fe_router_address,
be_router_address):
self.publisher_address = publisher_address
self.fe_router_address = fe_router_address
self.be_router_address = be_router_address
super(RouterUpdater, self).__init__(
conf, matchmaker, self._update_records,
conf.oslo_messaging_zmq.zmq_target_update)
def _update_records(self):
self.matchmaker.register_publisher(
(self.publisher_address, self.fe_router_address),
expire=self.conf.oslo_messaging_zmq.zmq_target_expire)
LOG.info(_LI("[PUB:%(pub)s, ROUTER:%(router)s] Update PUB publisher"),
{"pub": self.publisher_address,
"router": self.fe_router_address})
self.matchmaker.register_router(
self.be_router_address,
expire=self.conf.oslo_messaging_zmq.zmq_target_expire)
LOG.info(_LI("[Backend ROUTER:%(router)s] Update ROUTER"),
{"router": self.be_router_address})
def cleanup(self):
super(RouterUpdater, self).cleanup()
self.matchmaker.unregister_publisher(
(self.publisher_address, self.fe_router_address))
self.matchmaker.unregister_router(
self.be_router_address)
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