72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
# Copyright 2015 Rackspace
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#
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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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from oslo_config import cfg
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from oslo_log import log as logging
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import oslo_messaging
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import six
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LOG = logging.getLogger(__name__)
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@six.add_metaclass(abc.ABCMeta)
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class EventStreamerBase(object):
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"""Base class for EventStreamer
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A stand in abstract class that defines what methods are stevedore loaded
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implementations of event streamer is expected to provide.
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"""
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@abc.abstractmethod
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def emit(self, cnt):
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"""method to send a DB event to neutron-lbaas if it is needed.
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:param cnt: an InfoContainer container object
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:return: None
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"""
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class EventStreamerNoop(EventStreamerBase):
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"""Nop class implementation of EventStreamer
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Useful if you're running in standalone mode and don't need to send
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updates to Neutron LBaaS
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"""
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def emit(self, cnt):
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pass
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class EventStreamerNeutron(EventStreamerBase):
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"""Neutron LBaaS
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When you're using Octavia alongside neutron LBaaS this class provides
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a mechanism to send updates to neutron LBaaS database via
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oslo_messaging queues.
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"""
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def __init__(self):
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topic = cfg.CONF.oslo_messaging.event_stream_topic
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self.transport = oslo_messaging.get_transport(cfg.CONF)
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self.target = oslo_messaging.Target(topic=topic, exchange="common",
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namespace='control', fanout=False,
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version='1.0')
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self.client = oslo_messaging.RPCClient(self.transport, self.target)
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def emit(self, cnt):
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LOG.debug("Emitting data to event streamer %s", cnt.to_dict())
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self.client.cast({}, 'update_info', container=cnt.to_dict())
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