1f6aa0df14
This commit provides the framework for the Savanna CLI. It is based on the python-novaclient. novaclient was chosen because of its maturity and the ubiquity in which it has been previously copied, i.e. we're in the same boat as most everyone else. The goal is to keep modifications in Savanna's copy to a minimum. To that end, much of the novaclient code is retained, though commented out when it is not applicable. A simple plugins-list/show command is provided with the framework for demonstration and testing purposes. Change-Id: I6bbbc86135d6cb16e088dd76261fdef29c2cb929 Implements: blueprint python-savannaclient-cli
144 lines
4.5 KiB
Python
144 lines
4.5 KiB
Python
# Copyright 2013 OpenStack Foundation
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# Copyright 2013 Spanish National Research Council.
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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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import logging
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import pkg_resources
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import six
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from savannaclient.nova import utils
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from savannaclient.openstack.common.apiclient import exceptions
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logger = logging.getLogger(__name__)
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_discovered_plugins = {}
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def discover_auth_systems():
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"""Discover the available auth-systems.
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This won't take into account the old style auth-systems.
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"""
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ep_name = 'openstack.client.auth_plugin'
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for ep in pkg_resources.iter_entry_points(ep_name):
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try:
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auth_plugin = ep.load()
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except (ImportError, pkg_resources.UnknownExtra, AttributeError) as e:
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logger.debug("ERROR: Cannot load auth plugin %s" % ep.name)
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logger.debug(e, exc_info=1)
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else:
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_discovered_plugins[ep.name] = auth_plugin
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def load_auth_system_opts(parser):
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"""Load options needed by the available auth-systems into a parser.
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This function will try to populate the parser with options from the
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available plugins.
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"""
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for name, auth_plugin in six.iteritems(_discovered_plugins):
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add_opts_fn = getattr(auth_plugin, "add_opts", None)
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if add_opts_fn:
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group = parser.add_argument_group("Auth-system '%s' options" %
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name)
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add_opts_fn(group)
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def load_plugin(auth_system):
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if auth_system in _discovered_plugins:
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return _discovered_plugins[auth_system]()
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# NOTE(aloga): If we arrive here, the plugin will be an old-style one,
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# so we have to create a fake AuthPlugin for it.
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return DeprecatedAuthPlugin(auth_system)
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class BaseAuthPlugin(object):
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"""Base class for authentication plugins.
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An authentication plugin needs to override at least the authenticate
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method to be a valid plugin.
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"""
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def __init__(self):
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self.opts = {}
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def get_auth_url(self):
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"""Return the auth url for the plugin (if any)."""
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return None
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@staticmethod
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def add_opts(parser):
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"""Populate and return the parser with the options for this plugin.
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If the plugin does not need any options, it should return the same
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parser untouched.
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"""
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return parser
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def parse_opts(self, args):
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"""Parse the actual auth-system options if any.
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This method is expected to populate the attribute self.opts with a
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dict containing the options and values needed to make authentication.
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If the dict is empty, the client should assume that it needs the same
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options as the 'keystone' auth system (i.e. os_username and
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os_password).
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Returns the self.opts dict.
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"""
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return self.opts
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def authenticate(self, cls, auth_url):
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"""Authenticate using plugin defined method."""
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raise exceptions.AuthSystemNotFound(self.auth_system)
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class DeprecatedAuthPlugin(object):
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"""Class to mimic the AuthPlugin class for deprecated auth systems.
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Old auth systems only define two entry points: openstack.client.auth_url
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and openstack.client.authenticate. This class will load those entry points
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into a class similar to a valid AuthPlugin.
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"""
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def __init__(self, auth_system):
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self.auth_system = auth_system
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def authenticate(cls, auth_url):
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raise exceptions.AuthSystemNotFound(self.auth_system)
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self.opts = {}
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self.get_auth_url = lambda: None
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self.authenticate = authenticate
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self._load_endpoints()
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def _load_endpoints(self):
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ep_name = 'openstack.client.auth_url'
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fn = utils._load_entry_point(ep_name, name=self.auth_system)
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if fn:
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self.get_auth_url = fn
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ep_name = 'openstack.client.authenticate'
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fn = utils._load_entry_point(ep_name, name=self.auth_system)
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if fn:
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self.authenticate = fn
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def parse_opts(self, args):
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return self.opts
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