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# Copyright (c) 2013 Mirantis 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 json
import logging
import six
LOG = logging.getLogger(__name__)
class Resource(object):
resource_name = 'Something'
defaults = {}
def __init__(self, manager, info):
self.manager = manager
self._info = info
self._set_defaults(info)
self._add_details(info)
def _set_defaults(self, info):
for name, value in six.iteritems(self.defaults):
if name not in info:
info[name] = value
def _add_details(self, info):
for (k, v) in six.iteritems(info):
try:
setattr(self, k, v)
self._info[k] = v
except AttributeError:
# In this case we already defined the attribute on the class
pass
def __str__(self):
return '%s %s' % (self.resource_name, str(self._info))
def _check_items(obj, searches):
try:
return all(getattr(obj, attr) == value for (attr, value) in searches)
except AttributeError:
return False
class ResourceManager(object):
resource_class = None
def __init__(self, api):
self.api = api
def find(self, **kwargs):
return [i for i in self.list() if _check_items(i, kwargs.items())]
def _copy_if_defined(self, data, **kwargs):
for var_name, var_value in six.iteritems(kwargs):
if var_value is not None:
data[var_name] = var_value
def _create(self, url, data, response_key=None, dump_json=True):
if dump_json:
data = json.dumps(data)
resp = self.api.client.post(url, data)
if resp.status_code != 202:
self._raise_api_exception(resp)
if response_key is not None:
data = get_json(resp)[response_key]
else:
data = get_json(resp)
return self.resource_class(self, data)
def _update(self, url, data, response_key=None, dump_json=True):
if dump_json:
data = json.dumps(data)
resp = self.api.client.put(url, data)
if resp.status_code != 202:
self._raise_api_exception(resp)
if response_key is not None:
data = get_json(resp)[response_key]
else:
data = get_json(resp)
return self.resource_class(self, data)
def _list(self, url, response_key):
resp = self.api.client.get(url)
if resp.status_code == 200:
data = get_json(resp)[response_key]
return [self.resource_class(self, res)
for res in data]
else:
self._raise_api_exception(resp)
def _get(self, url, response_key=None):
resp = self.api.client.get(url)
if resp.status_code == 200:
if response_key is not None:
data = get_json(resp)[response_key]
else:
data = get_json(resp)
return self.resource_class(self, data)
else:
self._raise_api_exception(resp)
def _delete(self, url):
resp = self.api.client.delete(url)
if resp.status_code != 204:
self._raise_api_exception(resp)
def _plurify_resource_name(self):
return self.resource_class.resource_name + 's'
def _raise_api_exception(self, resp):
error_data = get_json(resp)
raise APIException(error_data["error_message"])
def get_json(response):
"""This method provided backward compatibility with old versions
of requests library
"""
json_field_or_function = getattr(response, 'json', None)
if callable(json_field_or_function):
return response.json()
else:
return json.loads(response.content)
class APIException(Exception):
pass
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