71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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import collections
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import logging
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import six
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from oslo_messaging._i18n import _LI, _LW
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LOG = logging.getLogger(__name__)
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@six.add_metaclass(abc.ABCMeta)
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class MatchMakerBase(object):
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def __init__(self, conf, *args, **kwargs):
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super(MatchMakerBase, self).__init__(*args, **kwargs)
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self.conf = conf
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@abc.abstractmethod
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def register(self, topic, hostname):
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"""Register topic on nameserver"""
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@abc.abstractmethod
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def get_hosts(self, topic):
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"""Get hosts from nameserver by topic"""
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def get_single_host(self, topic):
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"""Get a single host by topic"""
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hosts = self.get_hosts(topic)
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if len(hosts) == 0:
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LOG.warning(_LW("No hosts were found for topic %s. Using "
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"localhost") % topic)
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return "localhost"
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elif len(hosts) == 1:
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LOG.info(_LI("A single host found for topic %s.") % topic)
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return hosts[0]
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else:
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LOG.warning(_LW("Multiple hosts were found for topic %s. Using "
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"the first one.") % topic)
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return hosts[0]
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class DummyMatchMaker(MatchMakerBase):
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def __init__(self, conf, *args, **kwargs):
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super(DummyMatchMaker, self).__init__(conf, *args, **kwargs)
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self._cache = collections.defaultdict(list)
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def register(self, topic, hostname):
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if hostname not in self._cache[topic]:
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self._cache[topic].append(hostname)
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def get_hosts(self, topic):
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return self._cache[topic]
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