6a08320031
This change condenses the directory structure to something more similar to what we had before while producing similar packages. It also introduces version.py which allows us to get the version from git tags (or a fallback version if not available). Fixes lp bug 889336 Fixes lp bug 888795 Change-Id: I86136bd9dbabb5eb1f8366ed665ed9b54f695124
89 lines
3.0 KiB
Python
89 lines
3.0 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 quantum.common import utils
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from quantum.common.config import find_config_file
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from quantum.common.exceptions import ClassNotFound
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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 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 config_file:
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config_file = [config_file]
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self.configuration_file = find_config_file(options, config_file,
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CONFIG_FILE)
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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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# If the plugin can't be found let them know gracefully
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try:
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plugin_klass = utils.import_class(options['plugin_provider'])
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except ClassNotFound:
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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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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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