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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Copyright 2011 Nebula, Inc.
#
# 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
import logging
from django.utils.decorators import available_attrs
from horizon import exceptions
__all__ = ('APIResourceWrapper', 'APIDictWrapper',
'get_service_from_catalog', 'url_for',)
LOG = logging.getLogger(__name__)
class APIResourceWrapper(object):
""" Simple wrapper for api objects
Define _attrs on the child class and pass in the
api object as the only argument to the constructor
"""
_attrs = []
def __init__(self, apiresource):
self._apiresource = apiresource
def __getattr__(self, attr):
if attr in self._attrs:
# __getattr__ won't find properties
return self._apiresource.__getattribute__(attr)
else:
LOG.debug('Attempted to access unknown attribute "%s" on'
' APIResource object of type "%s" wrapping resource of'
' type "%s"' % (attr, self.__class__,
self._apiresource.__class__))
raise AttributeError(attr)
class APIDictWrapper(object):
""" Simple wrapper for api dictionaries
Some api calls return dictionaries. This class provides identical
behavior as APIResourceWrapper, except that it will also behave as a
dictionary, in addition to attribute accesses.
Attribute access is the preferred method of access, to be
consistent with api resource objects from openstackx
"""
def __init__(self, apidict):
self._apidict = apidict
def __getattr__(self, attr):
if attr in self._attrs:
try:
return self._apidict[attr]
except KeyError, e:
raise AttributeError(e)
else:
LOG.debug('Attempted to access unknown item "%s" on'
'APIResource object of type "%s"'
% (attr, self.__class__))
raise AttributeError(attr)
def __getitem__(self, item):
try:
return self.__getattr__(item)
except AttributeError, e:
# caller is expecting a KeyError
raise KeyError(e)
def get(self, item, default=None):
try:
return self.__getattr__(item)
except AttributeError:
return default
def get_service_from_catalog(catalog, service_type):
for service in catalog:
if service['type'] == service_type:
return service
return None
def url_for(request, service_type, admin=False):
catalog = request.user.service_catalog
service = get_service_from_catalog(catalog, service_type)
if service:
try:
if admin:
return service['endpoints'][0]['adminURL']
else:
return service['endpoints'][0]['internalURL']
except (IndexError, KeyError):
raise exceptions.ServiceCatalogException(service_type)
else:
raise exceptions.ServiceCatalogException(service_type)
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