78 lines
2.6 KiB
Python
78 lines
2.6 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 gettext
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import logging
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import os
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gettext.install('quantum', unicode=1)
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from common import utils
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from quantum_plugin_base import QuantumPluginBase
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LOG = logging.getLogger('quantum.manager')
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CONFIG_FILE = "plugins.ini"
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LOG = logging.getLogger('quantum.manager')
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def find_config(basepath):
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for root, dirs, files in os.walk(basepath):
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if CONFIG_FILE in files:
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return os.path.join(root, CONFIG_FILE)
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return None
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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 config_file == None:
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self.configuration_file = find_config(
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os.path.abspath(os.path.dirname(__file__)))
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else:
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self.configuration_file = config_file
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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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if not 'plugin_provider' in options:
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options['plugin_provider'] = \
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utils.get_plugin_from_config(self.configuration_file)
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LOG.debug("Plugin location:%s", options['plugin_provider'])
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plugin_klass = utils.import_class(options['plugin_provider'])
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if not issubclass(plugin_klass, QuantumPluginBase):
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raise Exception("Configured Quantum plug-in " \
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"didn't pass compatibility test")
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else:
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LOG.debug("Successfully imported Quantum plug-in." \
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"All compatibility tests passed")
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self.plugin = plugin_klass()
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@classmethod
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def get_plugin(cls, options=None, config_file=None):
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if cls._instance is None:
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cls._instance = cls(options, config_file)
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return cls._instance.plugin
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