f0f15f89c6
These particular imports are no longer needed in a Python 3-only world. Change-Id: I5e9e15556c04871c451f6363380f2a7ac026c968
95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
# -*- encoding: utf-8 -*-
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# Copyright (c) 2016 b<>com
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_config import cfg
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from oslo_log import log
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from stevedore import driver as drivermanager
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from stevedore import extension as extensionmanager
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from watcher.common import exception
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from watcher.common.loader import base
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from watcher.common import utils
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LOG = log.getLogger(__name__)
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class DefaultLoader(base.BaseLoader):
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def __init__(self, namespace, conf=cfg.CONF):
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"""Entry point loader for Watcher using Stevedore
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:param namespace: namespace of the entry point(s) to load or list
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:type namespace: str
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:param conf: ConfigOpts instance, defaults to cfg.CONF
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"""
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super(DefaultLoader, self).__init__()
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self.namespace = namespace
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self.conf = conf
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def load(self, name, **kwargs):
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try:
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LOG.debug("Loading in namespace %s => %s ", self.namespace, name)
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driver_manager = drivermanager.DriverManager(
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namespace=self.namespace,
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name=name,
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invoke_on_load=False,
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)
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driver_cls = driver_manager.driver
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config = self._load_plugin_config(name, driver_cls)
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driver = driver_cls(config, **kwargs)
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except Exception as exc:
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LOG.exception(exc)
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raise exception.LoadingError(name=name)
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return driver
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def _reload_config(self):
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self.conf(default_config_files=self.conf.default_config_files)
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def get_entry_name(self, name):
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return ".".join([self.namespace, name])
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def _load_plugin_config(self, name, driver_cls):
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"""Load the config of the plugin"""
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config = utils.Struct()
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config_opts = driver_cls.get_config_opts()
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if not config_opts:
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return config
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group_name = self.get_entry_name(name)
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self.conf.register_opts(config_opts, group=group_name)
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# Finalise the opt import by re-checking the configuration
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# against the provided config files
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self._reload_config()
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config_group = self.conf.get(group_name)
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if not config_group:
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raise exception.LoadingError(name=name)
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config.update({
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name: value for name, value in config_group.items()
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})
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return config
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def list_available(self):
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extension_manager = extensionmanager.ExtensionManager(
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namespace=self.namespace)
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return {ext.name: ext.plugin for ext in extension_manager.extensions}
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