/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/zmq_driver/broker/zmq_broker.py is in python-oslo.messaging 4.6.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# 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
import os
from oslo_utils import excutils
from stevedore import driver
from oslo_messaging._drivers.zmq_driver.broker import zmq_queue_proxy
from oslo_messaging._drivers.zmq_driver import zmq_async
from oslo_messaging._i18n import _LE, _LI
zmq = zmq_async.import_zmq(zmq_concurrency='native')
LOG = logging.getLogger(__name__)
class ZmqBroker(object):
"""Local messaging IPC broker (nodes are still peers).
The main purpose is to have native zeromq application.
Benefits of such approach are following:
1. No risk to block the main thread of the process by unpatched
native parts of the libzmq (c-library is completely monkey-patch
unfriendly)
2. Making use of standard zmq approaches as async pollers,
devices, queues etc.
3. Possibility to implement queue persistence not touching existing
clients (staying in a separate process).
"""
def __init__(self, conf):
super(ZmqBroker, self).__init__()
self.conf = conf
self._create_ipc_dirs()
self.matchmaker = driver.DriverManager(
'oslo.messaging.zmq.matchmaker',
self.conf.rpc_zmq_matchmaker,
).driver(self.conf)
self.context = zmq.Context()
self.proxies = [zmq_queue_proxy.UniversalQueueProxy(
conf, self.context, self.matchmaker)
]
def _create_ipc_dirs(self):
ipc_dir = self.conf.rpc_zmq_ipc_dir
try:
os.makedirs("%s/fanout" % ipc_dir)
except os.error:
if not os.path.isdir(ipc_dir):
with excutils.save_and_reraise_exception():
LOG.error(_LE("Required IPC directory does not exist at"
" %s"), ipc_dir)
def start(self):
for proxy in self.proxies:
proxy.start()
def wait(self):
for proxy in self.proxies:
proxy.wait()
def close(self):
LOG.info(_LI("Broker shutting down ..."))
for proxy in self.proxies:
proxy.stop()
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