aaf0fef1ca
Bug #1073194 We use openstack common log to do logging. At the same time, we will use quantum logger as our top logger, so that all sub loggers will be set according to quantum.conf Change-Id: I5adf72e6031ad437e05c3521864a83757b3e7887
66 lines
2.4 KiB
Python
66 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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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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from quantum.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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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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# 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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self.plugin = plugin_klass()
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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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