/usr/lib/python2.7/dist-packages/oslo_messaging/_drivers/zmq_driver/matchmaker/zmq_matchmaker_base.py is in python-oslo.messaging 5.35.0-0ubuntu1.
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 logging
import six
import time
from oslo_messaging._drivers import common as rpc_common
from oslo_messaging._drivers.zmq_driver import zmq_address
from oslo_messaging._drivers.zmq_driver import zmq_async
from oslo_messaging._i18n import _LE
LOG = logging.getLogger(__name__)
class MatchmakerUnavailable(rpc_common.RPCException):
"""Exception is raised on connection error to matchmaker service"""
def __init__(self):
super(MatchmakerUnavailable, self).__init__(
message=_LE("Matchmaker is not currently available."))
@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, expire=-1):
"""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
:param expire: record expiration timeout
:type expire: int
"""
@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_router(self, hostname, expire=-1):
"""Register router on the nameserver.
This works for ROUTER proxy only
:param hostname: host for the topic in "host:port" format
:type hostname: str
:param expire: record expiration timeout
:type expire: int
"""
@abc.abstractmethod
def unregister_router(self, hostname):
"""Unregister router on the nameserver.
This works for ROUTER proxy only
:param hostname: host for the topic in "host:port" format
:type hostname: str
"""
@abc.abstractmethod
def get_routers(self):
"""Get all router-hosts from nameserver.
:returns: a list 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: str
:param listener_type: listener socket type ROUTER, SUB etc.
:type listener_type: str
: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: str
:param listener_type: listener socket type ROUTER, SUB etc.
:type listener_type: str
"""
@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
:param listener_type: listener socket type ROUTER, SUB etc.
:type listener_type: str
:returns: a list of "hostname:port" hosts
"""
@abc.abstractmethod
def get_hosts_retry(self, target, listener_type):
"""Retry if not hosts - used on client first time connection.
:param target: the default target for invocations
:type target: Target
:param listener_type: listener socket type ROUTER, SUB etc.
:type listener_type: str
:returns: a list of "hostname:port" hosts
"""
@abc.abstractmethod
def get_hosts_fanout(self, target, listener_type):
"""Get all hosts for fanout from nameserver by target.
:param target: the default target for invocations
:type target: Target
:param listener_type: listener socket type ROUTER, SUB etc.
:type listener_type: str
:returns: a list of "hostname:port" hosts
"""
@abc.abstractmethod
def get_hosts_fanout_retry(self, target, listener_type):
"""Retry if not host for fanout - used on client first time connection.
:param target: the default target for invocations
:type target: Target
:param listener_type: listener socket type ROUTER, SUB etc.
:type listener_type: str
:returns: a list of "hostname:port" hosts
"""
class MatchmakerDummy(MatchmakerBase):
def __init__(self, conf, *args, **kwargs):
super(MatchmakerDummy, self).__init__(conf, *args, **kwargs)
self._cache = collections.defaultdict(list)
self._publishers = set()
self._routers = set()
self._address = {}
self.executor = zmq_async.get_executor(method=self._loop)
self.executor.execute()
def register_publisher(self, hostname, expire=-1):
if hostname not in self._publishers:
self._publishers.add(hostname)
self._address[hostname] = expire
def unregister_publisher(self, hostname):
if hostname in self._publishers:
self._publishers.remove(hostname)
if hostname in self._address:
self._address.pop(hostname)
def get_publishers(self):
hosts = [host for host in self._publishers
if self._address[host] > 0]
return hosts
def register_router(self, hostname, expire=-1):
if hostname not in self._routers:
self._routers.add(hostname)
self._address[hostname] = expire
def unregister_router(self, hostname):
if hostname in self._routers:
self._routers.remove(hostname)
if hostname in self._address:
self._address.pop(hostname)
def get_routers(self):
hosts = [host for host in self._routers
if self._address[host] > 0]
return hosts
def _loop(self):
for hostname in self._address:
expire = self._address[hostname]
if expire > 0:
self._address[hostname] = expire - 1
time.sleep(1)
def register(self, target, hostname, listener_type, expire=-1):
if target.server:
key = zmq_address.target_to_key(target, listener_type)
if hostname not in self._cache[key]:
self._cache[key].append(hostname)
key = zmq_address.prefix_str(target.topic, listener_type)
if hostname not in self._cache[key]:
self._cache[key].append(hostname)
self._address[hostname] = expire
def unregister(self, target, hostname, listener_type):
if target.server:
key = zmq_address.target_to_key(target, listener_type)
if hostname in self._cache[key]:
self._cache[key].remove(hostname)
key = zmq_address.prefix_str(target.topic, listener_type)
if hostname in self._cache[key]:
self._cache[key].remove(hostname)
if hostname in self._address:
self._address.pop(hostname)
def get_hosts(self, target, listener_type):
hosts = []
if target.server:
key = zmq_address.target_to_key(target, listener_type)
hosts.extend([host for host in self._cache[key]
if self._address[host] > 0])
if not hosts:
key = zmq_address.prefix_str(target.topic, listener_type)
hosts.extend([host for host in self._cache[key]
if self._address[host] > 0])
LOG.debug("[Dummy] get_hosts for target %(target)s: %(hosts)s",
{"target": target, "hosts": hosts})
return hosts
def get_hosts_retry(self, target, listener_type):
# Do not complicate dummy matchmaker
# This method will act smarter in real world matchmakers
return self.get_hosts(target, listener_type)
def get_hosts_fanout(self, target, listener_type):
hosts = []
key = zmq_address.target_to_key(target, listener_type)
hosts.extend([host for host in self._cache[key]
if self._address[host] > 0])
LOG.debug("[Dummy] get_hosts_fanout for target %(target)s: %(hosts)s",
{"target": target, "hosts": hosts})
return hosts
def get_hosts_fanout_retry(self, target, listener_type):
# Do not complicate dummy matchmaker
# This method will act smarter in real world matchmakers
return self.get_hosts_fanout(target, listener_type)
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