Source code for octavia.controller.queue.event_queue

# Copyright 2015 Rackspace
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
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#    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
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import abc

from oslo_config import cfg
from oslo_log import log as logging
import oslo_messaging
import six

LOG = logging.getLogger(__name__)

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