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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 OpenStack LLC
#
# 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 functools
from keystone.openstack.common import importutils
class Manager(object):
"""Base class for intermediary request layer.
The Manager layer exists to support additional logic that applies to all
or some of the methods exposed by a service that are not specific to the
HTTP interface.
It also provides a stable entry point to dynamic backends.
An example of a probable use case is logging all the calls.
"""
def __init__(self, driver_name):
self.driver = importutils.import_object(driver_name)
def __getattr__(self, name):
"""Forward calls to the underlying driver."""
f = getattr(self.driver, name)
@functools.wraps(f)
def _wrapper(*args, **kw):
return f(*args, **kw)
setattr(self, name, _wrapper)
return _wrapper
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