9271654adf
More specifically uses global CONF for the quantum.conf file.
Added support for the RYU plugin (similar to ovs and lb,
which use non-global conf for plugins)
patch 27: clean up find_config_file
patch 28: for config file use old paths (plugin unit tests)
this hopefully will be replaced when we move to common
config file
patch 30: rebase and merge (utils.py and policy.py)
Change-Id: Ic0bf5bdd44f24a557240f7afe4e070dee448c63c
71 lines
2.4 KiB
Python
71 lines
2.4 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 Nicira Networks, Inc
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# All Rights Reserved.
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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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# @author: Somik Behera, Nicira Networks, Inc.
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"""
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Quantum's Manager class is responsible for parsing a config file and
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instantiating the correct plugin that concretely implement quantum_plugin_base
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class.
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The caller should make sure that QuantumManager is a singleton.
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"""
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import logging
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from quantum.common.exceptions import ClassNotFound
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from quantum.openstack.common import cfg
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from quantum.openstack.common import importutils
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LOG = logging.getLogger(__name__)
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def get_plugin(plugin_provider):
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# If the plugin can't be found let them know gracefully
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try:
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LOG.info("Loading Plugin: %s" % plugin_provider)
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plugin_klass = importutils.import_class(plugin_provider)
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except ClassNotFound:
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LOG.exception("Error loading plugin")
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raise Exception("Plugin not found. You can install a "
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"plugin with: pip install <plugin-name>\n"
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"Example: pip install quantum-sample-plugin")
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return plugin_klass()
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class QuantumManager(object):
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_instance = None
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def __init__(self, options=None, config_file=None):
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# If no options have been provided, create an empty dict
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if not options:
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options = {}
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# NOTE(jkoelker) Testing for the subclass with the __subclasshook__
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# breaks tach monitoring. It has been removed
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# intentianally to allow v2 plugins to be monitored
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# for performance metrics.
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plugin_provider = cfg.CONF.core_plugin
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LOG.debug("Plugin location:%s", plugin_provider)
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self.plugin = get_plugin(plugin_provider)
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@classmethod
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def get_plugin(cls):
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if cls._instance is None:
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cls._instance = cls()
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return cls._instance.plugin
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