140 lines
3.6 KiB
Python
140 lines
3.6 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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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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import abc
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from oslo.config import cfg
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import six
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from stevedore import enabled
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from sahara import exceptions as ex
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from sahara.openstack.common import log as logging
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from sahara.utils import resources
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LOG = logging.getLogger(__name__)
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opts = [
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cfg.ListOpt('plugins',
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default=['vanilla', 'hdp'],
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help='List of plugins to be loaded. Sahara preserves the '
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'order of the list when returning it.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(opts)
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def required(fun):
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return abc.abstractmethod(fun)
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def required_with_default(fun):
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return fun
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def optional(fun):
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fun.__not_implemented__ = True
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return fun
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@six.add_metaclass(abc.ABCMeta)
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class PluginInterface(resources.BaseResource):
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__resource_name__ = 'plugin'
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name = 'plugin_interface'
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@required
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def get_title(self):
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"""Plugin title
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For example:
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"Vanilla Provisioning"
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"""
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pass
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@required_with_default
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def get_description(self):
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"""Optional description of the plugin
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This information is targeted to be displayed in UI.
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"""
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pass
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def to_dict(self):
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return {
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'name': self.name,
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'title': self.get_title(),
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'description': self.get_description(),
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}
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class PluginManager(object):
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def __init__(self):
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self.plugins = {}
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self._load_cluster_plugins()
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def _load_cluster_plugins(self):
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config_plugins = CONF.plugins
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extension_manager = enabled.EnabledExtensionManager(
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check_func=lambda ext: ext.name in config_plugins,
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namespace='sahara.cluster.plugins',
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invoke_on_load=True
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)
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for ext in extension_manager.extensions:
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if ext.name in self.plugins:
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raise ex.ConfigurationError(
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"Plugin with name '%s' already exists." % ext.name)
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ext.obj.name = ext.name
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self.plugins[ext.name] = ext.obj
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LOG.info("Plugin '%s' loaded (%s)"
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% (ext.name, ext.entry_point_target))
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if len(self.plugins) < len(config_plugins):
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loaded_plugins = set(six.iterkeys(self.plugins))
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requested_plugins = set(config_plugins)
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raise ex.ConfigurationError(
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"Plugins couldn't be loaded: %s" %
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", ".join(requested_plugins - loaded_plugins))
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def get_plugins(self, base):
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return [
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self.plugins[plugin] for plugin in CONF.plugins
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if not base or issubclass(self.plugins[plugin].__class__, base)
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]
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def get_plugin(self, plugin_name):
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return self.plugins.get(plugin_name)
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def is_plugin_implements(self, plugin_name, fun_name):
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plugin = self.get_plugin(plugin_name)
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fun = getattr(plugin, fun_name)
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if not (fun and callable(fun)):
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return False
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return not hasattr(fun, '__not_implemented__')
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PLUGINS = None
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def setup_plugins():
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global PLUGINS
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PLUGINS = PluginManager()
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