164 lines
4.9 KiB
Python
164 lines
4.9 KiB
Python
#
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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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from oslo.config import cfg
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from oslo.utils import importutils
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from stevedore import extension
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import warnings
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from heat.common.i18n import _LW
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from heat.openstack.common import log as logging
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LOG = logging.getLogger(__name__)
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_default_backend = "heat.engine.clients.OpenStackClients"
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cloud_opts = [
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cfg.StrOpt('cloud_backend',
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default=_default_backend,
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help="Fully qualified class name to use as a client backend.")
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]
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cfg.CONF.register_opts(cloud_opts)
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class OpenStackClients(object):
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'''
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Convenience class to create and cache client instances.
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'''
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def __init__(self, context):
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self.context = context
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self._clients = {}
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self._client_plugins = {}
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def client_plugin(self, name):
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global _mgr
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if name in self._client_plugins:
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return self._client_plugins[name]
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if _mgr and name in _mgr.names():
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client_plugin = _mgr[name].plugin(self.context)
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self._client_plugins[name] = client_plugin
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return client_plugin
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def client(self, name):
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client_plugin = self.client_plugin(name)
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if client_plugin:
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return client_plugin.client()
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if name in self._clients:
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return self._clients[name]
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# call the local method _<name>() if a real client plugin
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# doesn't exist
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method_name = '_%s' % name
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if callable(getattr(self, method_name, None)):
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client = getattr(self, method_name)()
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self._clients[name] = client
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return client
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LOG.warn(_LW('Requested client "%s" not found'), name)
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@property
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def auth_token(self):
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# Always use the auth_token from the keystone() client, as
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# this may be refreshed if the context contains credentials
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# which allow reissuing of a new token before the context
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# auth_token expiry (e.g trust_id or username/password)
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return self.client('keystone').auth_token
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def keystone(self):
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warnings.warn('keystone() is deprecated. '
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'Replace with calls to client("keystone")')
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return self.client('keystone')
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def url_for(self, **kwargs):
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return self.client('keystone').url_for(**kwargs)
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def nova(self):
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warnings.warn('nova() is deprecated. '
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'Replace with calls to client("nova")')
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return self.client('nova')
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def swift(self):
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warnings.warn('swift() is deprecated. '
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'Replace with calls to client("swift")')
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return self.client('swift')
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def glance(self):
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warnings.warn('glance() is deprecated. '
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'Replace with calls to client("glance")')
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return self.client('glance')
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def neutron(self):
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warnings.warn('neutron() is deprecated. '
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'Replace with calls to client("neutron")')
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return self.client('neutron')
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def cinder(self):
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warnings.warn('cinder() is deprecated. '
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'Replace with calls to client("cinder")')
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return self.client('cinder')
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def trove(self):
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warnings.warn('trove() is deprecated. '
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'Replace with calls to client("trove")')
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return self.client('trove')
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def ceilometer(self):
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warnings.warn('ceilometer() is deprecated. '
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'Replace with calls to client("ceilometer")')
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return self.client('ceilometer')
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def heat(self):
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warnings.warn('heat() is deprecated. '
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'Replace with calls to client("heat")')
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return self.client('heat')
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class ClientBackend(object):
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'''Delay choosing the backend client module until the client's class needs
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to be initialized.
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'''
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def __new__(cls, context):
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if cfg.CONF.cloud_backend == _default_backend:
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return OpenStackClients(context)
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else:
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return importutils.import_object(
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cfg.CONF.cloud_backend,
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context
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)
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Clients = ClientBackend
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_mgr = None
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def has_client(name):
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return _mgr and name in _mgr.names()
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def initialise():
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global _mgr
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if _mgr:
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return
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_mgr = extension.ExtensionManager(
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namespace='heat.clients',
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invoke_on_load=False,
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verify_requirements=True)
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def list_opts():
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yield None, cloud_opts
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