93a6a5822d
Filtering by base class for plugins was never required. The unused imports removed as well. This is one of the initial refactoring steps for sahara and plugins into different projects. Partially-implements bp: move-plugins-to-separate-repo Change-Id: I20e83fd432b95c6e86ae218fa1a8e13766e8a461
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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from oslo_log import log as logging
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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.i18n import _
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from sahara.i18n import _LI
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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', 'spark', 'cdh'],
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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(_LI("Plugin {plugin_name} loaded {entry_point}").format(
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plugin_name=ext.name,
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entry_point=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):
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return [self.plugins[plugin] for plugin in CONF.plugins]
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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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