/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/zmq_driver/matchmaker/base.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 abc
import collections
import six
from oslo_messaging._drivers.zmq_driver import zmq_address
@six.add_metaclass(abc.ABCMeta)
class MatchMakerBase(object):
def __init__(self, conf, *args, **kwargs):
super(MatchMakerBase, self).__init__()
self.conf = conf
self.url = kwargs.get('url')
@abc.abstractmethod
def register_publisher(self, hostname):
"""Register publisher on nameserver.
This works for PUB-SUB only
:param hostname: host for the topic in "host:port" format
host for back-chatter in "host:port" format
:type hostname: tuple
"""
@abc.abstractmethod
def unregister_publisher(self, hostname):
"""Unregister publisher on nameserver.
This works for PUB-SUB only
:param hostname: host for the topic in "host:port" format
host for back-chatter in "host:port" format
:type hostname: tuple
"""
@abc.abstractmethod
def get_publishers(self):
"""Get all publisher-hosts from nameserver.
:returns: a list of tuples of strings "hostname:port" hosts
"""
@abc.abstractmethod
def register(self, target, hostname, listener_type, expire=-1):
"""Register target on nameserver.
If record already exists and has expiration timeout it will be
updated. Existing records without timeout will stay untouched
:param target: the target for host
:type target: Target
:param hostname: host for the topic in "host:port" format
:type hostname: String
:param listener_type: Listener socket type ROUTER, SUB etc.
:type listener_type: String
:param expire: Record expiration timeout
:type expire: int
"""
@abc.abstractmethod
def unregister(self, target, hostname, listener_type):
"""Unregister target from nameserver.
:param target: the target for host
:type target: Target
:param hostname: host for the topic in "host:port" format
:type hostname: String
:param listener_type: Listener socket type ROUTER, SUB etc.
:type listener_type: String
"""
@abc.abstractmethod
def get_hosts(self, target, listener_type):
"""Get all hosts from nameserver by target.
:param target: the default target for invocations
:type target: Target
:returns: a list of "hostname:port" hosts
"""
class DummyMatchMaker(MatchMakerBase):
def __init__(self, conf, *args, **kwargs):
super(DummyMatchMaker, self).__init__(conf, *args, **kwargs)
self._cache = collections.defaultdict(list)
self._publishers = set()
def register_publisher(self, hostname):
if hostname not in self._publishers:
self._publishers.add(hostname)
def unregister_publisher(self, hostname):
if hostname in self._publishers:
self._publishers.remove(hostname)
def get_publishers(self):
return list(self._publishers)
def register(self, target, hostname, listener_type, expire=-1):
key = zmq_address.target_to_key(target, listener_type)
if hostname not in self._cache[key]:
self._cache[key].append(hostname)
def unregister(self, target, hostname, listener_type):
key = zmq_address.target_to_key(target, listener_type)
if hostname in self._cache[key]:
self._cache[key].remove(hostname)
def get_hosts(self, target, listener_type):
key = zmq_address.target_to_key(target, listener_type)
return self._cache[key]
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