208d2debd0
*Python 3 deprecated the logger.warn method, see: *https://docs.python.org/3/library/logging.html#logging.warning *so we prefer to use warning to avoid DeprecationWarning. Change-Id: I07ee9c97c3548c965aaf83d34b37b23e9baba584
143 lines
4.4 KiB
Python
143 lines
4.4 KiB
Python
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
import weakref
|
|
|
|
from oslo_config import cfg
|
|
from oslo_log import log as logging
|
|
from oslo_utils import importutils
|
|
import six
|
|
from stevedore import enabled
|
|
|
|
from heat.common import exception
|
|
from heat.common.i18n import _
|
|
from heat.common.i18n import _LW
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
_default_backend = "heat.engine.clients.OpenStackClients"
|
|
|
|
cloud_opts = [
|
|
cfg.StrOpt('cloud_backend',
|
|
default=_default_backend,
|
|
help="Fully qualified class name to use as a client backend.")
|
|
]
|
|
cfg.CONF.register_opts(cloud_opts)
|
|
|
|
|
|
class OpenStackClients(object):
|
|
"""Convenience class to create and cache client instances."""
|
|
|
|
def __init__(self, context):
|
|
self._context = weakref.ref(context)
|
|
self._clients = {}
|
|
self._client_plugins = {}
|
|
|
|
@property
|
|
def context(self):
|
|
ctxt = self._context()
|
|
assert ctxt is not None, "Need a reference to the context"
|
|
return ctxt
|
|
|
|
def invalidate_plugins(self):
|
|
"""Used to force plugins to clear any cached client."""
|
|
for name in self._client_plugins:
|
|
self._client_plugins[name].invalidate()
|
|
|
|
def client_plugin(self, name):
|
|
global _mgr
|
|
if name in self._client_plugins:
|
|
return self._client_plugins[name]
|
|
if _mgr and name in _mgr.names():
|
|
client_plugin = _mgr[name].plugin(self.context)
|
|
self._client_plugins[name] = client_plugin
|
|
return client_plugin
|
|
|
|
def client(self, name):
|
|
client_plugin = self.client_plugin(name)
|
|
if client_plugin:
|
|
return client_plugin.client()
|
|
|
|
if name in self._clients:
|
|
return self._clients[name]
|
|
# call the local method _<name>() if a real client plugin
|
|
# doesn't exist
|
|
method_name = '_%s' % name
|
|
if callable(getattr(self, method_name, None)):
|
|
client = getattr(self, method_name)()
|
|
self._clients[name] = client
|
|
return client
|
|
LOG.warning(_LW('Requested client "%s" not found'), name)
|
|
|
|
@property
|
|
def auth_token(self):
|
|
# Always use the auth_token from the keystone() client, as
|
|
# this may be refreshed if the context contains credentials
|
|
# which allow reissuing of a new token before the context
|
|
# auth_token expiry (e.g trust_id or username/password)
|
|
return self.client('keystone').auth_token
|
|
|
|
|
|
class ClientBackend(object):
|
|
"""Class for delaying choosing the backend client module.
|
|
|
|
Delay choosing the backend client module until the client's class needs
|
|
to be initialized.
|
|
"""
|
|
def __new__(cls, context):
|
|
if cfg.CONF.cloud_backend == _default_backend:
|
|
return OpenStackClients(context)
|
|
else:
|
|
try:
|
|
return importutils.import_object(cfg.CONF.cloud_backend,
|
|
context)
|
|
except (ImportError, RuntimeError, cfg.NoSuchOptError) as err:
|
|
msg = _('Invalid cloud_backend setting in heat.conf '
|
|
'detected - %s') % six.text_type(err)
|
|
LOG.error(msg)
|
|
raise exception.Invalid(reason=msg)
|
|
|
|
|
|
Clients = ClientBackend
|
|
|
|
|
|
_mgr = None
|
|
|
|
|
|
def has_client(name):
|
|
return _mgr and name in _mgr.names()
|
|
|
|
|
|
def initialise():
|
|
global _mgr
|
|
if _mgr:
|
|
return
|
|
|
|
def client_is_available(client_plugin):
|
|
if not hasattr(client_plugin.plugin, 'is_available'):
|
|
# if the client does not have a is_available() class method, then
|
|
# we assume it wants to be always available
|
|
return True
|
|
# let the client plugin decide if it wants to register or not
|
|
return client_plugin.plugin.is_available()
|
|
|
|
_mgr = enabled.EnabledExtensionManager(
|
|
namespace='heat.clients',
|
|
check_func=client_is_available,
|
|
invoke_on_load=False)
|
|
|
|
|
|
def list_opts():
|
|
yield None, cloud_opts
|