55 lines
2.4 KiB
Python
55 lines
2.4 KiB
Python
# 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 oslo_log import log
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import stevedore
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from neutron.conf.agent import agent_extensions_manager as agent_ext_mgr_config
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LOG = log.getLogger(__name__)
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agent_ext_mgr_config.register_agent_ext_manager_opts()
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class AgentExtensionsManager(stevedore.named.NamedExtensionManager):
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"""Manage agent extensions."""
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def __init__(self, conf, namespace):
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super(AgentExtensionsManager, self).__init__(
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namespace, conf.agent.extensions,
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invoke_on_load=True, name_order=True)
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LOG.info("Loaded agent extensions: %s", self.names())
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def initialize(self, connection, driver_type, agent_api=None):
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"""Initialize enabled agent extensions.
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:param connection: RPC connection that can be reused by extensions to
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define their RPC endpoints
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:param driver_type: a string that defines the agent type to the
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extension. Can be used by the extension to choose
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the right backend implementation.
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:param agent_api: an AgentAPI instance that provides an API to
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interact with the agent that the manager
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is running in.
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"""
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# Initialize each agent extension in the list.
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for extension in self:
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LOG.info("Initializing agent extension '%s'", extension.name)
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# If the agent has provided an agent_api object, this object will
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# be passed to all interested extensions. This object must be
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# consumed by each such extension before the extension's
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# initialize() method is called, as the initialization step
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# relies on the agent_api already being available.
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extension.obj.consume_api(agent_api)
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extension.obj.initialize(connection, driver_type)
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