116 lines
3.9 KiB
Python
116 lines
3.9 KiB
Python
# Copyright 2016 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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from neutron_lbaas._i18n import _
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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 as messaging
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from oslo_messaging.rpc import dispatcher
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from oslo_service import service
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oslo_messaging_opts = [
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cfg.StrOpt('event_stream_topic',
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default='neutron_lbaas_event',
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help=_('topic name for receiving events from a queue'))
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]
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cfg.CONF.register_opts(oslo_messaging_opts, group='oslo_messaging')
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LOG = logging.getLogger(__name__)
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class InfoContainer(object):
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@staticmethod
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def from_dict(dict_obj):
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return InfoContainer(dict_obj['info_type'],
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dict_obj['info_id'],
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dict_obj['info_payload'])
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def __init__(self, info_type, info_id, info_payload):
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self.info_type = info_type
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self.info_id = info_id
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self.info_payload = info_payload
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def to_dict(self):
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return {'info_type': self.info_type,
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'info_id': self.info_id,
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'info_payload': self.info_payload}
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def __eq__(self, other):
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if not isinstance(other, InfoContainer):
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return False
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if self.info_type != other.info_type:
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return False
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if self.info_id != other.info_id:
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return False
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if self.info_payload != other.info_payload:
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return False
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return True
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def __ne__(self, other):
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return not self == other
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class ConsumerEndPoint(object):
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target = messaging.Target(namespace="control", version='1.0')
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def __init__(self, driver):
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self.driver = driver
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def update_info(self, ctx, container):
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LOG.debug("Received event from stream %s", container)
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container_inst = InfoContainer.from_dict(container)
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self.driver.handle_streamed_event(container_inst)
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class OctaviaConsumer(service.Service):
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def __init__(self, driver, **kwargs):
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super(OctaviaConsumer, self).__init__(**kwargs)
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topic = cfg.CONF.oslo_messaging.event_stream_topic
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server = cfg.CONF.host
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self.driver = driver
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self.transport = messaging.get_transport(cfg.CONF)
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self.target = messaging.Target(topic=topic, server=server,
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exchange="common", fanout=False)
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self.endpoints = [ConsumerEndPoint(self.driver)]
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self.server = None
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def start(self):
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super(OctaviaConsumer, self).start()
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LOG.info("Starting octavia consumer...")
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access_policy = dispatcher.DefaultRPCAccessPolicy
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self.server = messaging.get_rpc_server(self.transport, self.target,
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self.endpoints,
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executor='eventlet',
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access_policy=access_policy)
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self.server.start()
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def stop(self, graceful=False):
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if self.server:
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LOG.info('Stopping consumer...')
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self.server.stop()
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if graceful:
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LOG.info(
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('Consumer successfully stopped. Waiting for final '
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'messages to be processed...'))
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self.server.wait()
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super(OctaviaConsumer, self).stop(graceful=graceful)
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def reset(self):
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if self.server:
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self.server.reset()
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super(OctaviaConsumer, self).reset()
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