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# Copyright 2012 OpenStack Foundation
# All Rights Reserved.
#
# 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.
"""
Base utilities to build API operation managers and objects on top of.
"""
import copy
from ceilometerclient.openstack.common.apiclient import base
# Python 2.4 compat
try:
all
except NameError:
def all(iterable):
return True not in (not x for x in iterable)
def getid(obj):
"""Abstracts the common pattern of allowing both an object or an
object's ID (UUID) as a parameter when dealing with relationships.
"""
try:
return obj.id
except AttributeError:
return obj
class Manager(object):
"""Managers interact with a particular type of API
(samples, meters, alarms, etc.) and provide CRUD operations for them.
"""
resource_class = None
def __init__(self, api):
self.api = api
def _create(self, url, body):
body = self.api.post(url, json=body).json()
if body:
return self.resource_class(self, body)
def _list(self, url, response_key=None, obj_class=None, body=None,
expect_single=False):
body = self.api.get(url).json()
if obj_class is None:
obj_class = self.resource_class
if response_key:
try:
data = body[response_key]
except KeyError:
return []
else:
data = body
if expect_single:
data = [data]
return [obj_class(self, res, loaded=True) for res in data if res]
def _update(self, url, body, response_key=None):
body = self.api.put(url, json=body).json()
# PUT requests may not return a body
if body:
return self.resource_class(self, body)
def _delete(self, url):
self.api.delete(url)
class Resource(base.Resource):
"""A resource represents a particular instance of an object (tenant, user,
etc). This is pretty much just a bag for attributes.
:param manager: Manager object
:param info: dictionary representing resource attributes
:param loaded: prevent lazy-loading if set to True
"""
def to_dict(self):
return copy.deepcopy(self._info)
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