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# Copyright 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 copy
import json
import logging
LOG = logging.getLogger(__name__)
class Resource(object):
resource_name = 'Something'
defaults = {}
def __init__(self, manager, data):
self.manager = manager
self._data = data
self._set_defaults()
self._set_attributes()
def _set_defaults(self):
for k, v in self.defaults.items():
if k not in self._data:
self._data[k] = v
def _set_attributes(self):
for k, v in self._data.items():
try:
setattr(self, k, v)
except AttributeError:
# In this case we already defined the attribute on the class
pass
def to_dict(self):
return copy.deepcopy(self._data)
def __str__(self):
vals = ", ".join(["%s='%s'" % (n, v)
for n, v in self._data.items()])
return "%s [%s]" % (self.resource_name, vals)
def _check_items(obj, searches):
try:
return all(getattr(obj, attr) == value for (attr, value) in searches)
except AttributeError:
return False
def extract_json(response, response_key):
if response_key is not None:
return get_json(response)[response_key]
else:
return get_json(response)
class ResourceManager(object):
resource_class = None
def __init__(self, client):
self.client = client
def find(self, **kwargs):
return [i for i in self.list() if _check_items(i, kwargs.items())]
def _ensure_not_empty(self, **kwargs):
for name, value in kwargs.items():
if value is None or (isinstance(value, str) and len(value) == 0):
raise APIException('%s is missing field "%s"' %
(self.resource_class.__name__, name))
def _copy_if_defined(self, data, **kwargs):
for name, value in kwargs.items():
if value is not None:
data[name] = value
def _create(self, url, data, response_key=None, dump_json=True):
if dump_json:
data = json.dumps(data)
resp = self.client.http_client.post(url, data)
if resp.status_code != 201:
self._raise_api_exception(resp)
return self.resource_class(self, extract_json(resp, response_key))
def _update(self, url, data, response_key=None, dump_json=True):
if dump_json:
data = json.dumps(data)
resp = self.client.http_client.put(url, data)
if resp.status_code != 200:
self._raise_api_exception(resp)
return self.resource_class(self, extract_json(resp, response_key))
def _list(self, url, response_key=None):
resp = self.client.http_client.get(url)
if resp.status_code != 200:
self._raise_api_exception(resp)
return [self.resource_class(self, resource_data)
for resource_data in extract_json(resp, response_key)]
def _get(self, url, response_key=None):
resp = self.client.http_client.get(url)
if resp.status_code == 200:
return self.resource_class(self, extract_json(resp, response_key))
else:
self._raise_api_exception(resp)
def _delete(self, url):
resp = self.client.http_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):
try:
error_data = (resp.headers.get("Server-Error-Message", None) or
get_json(resp).get("faultstring"))
except ValueError:
error_data = resp.content
raise APIException(error_code=resp.status_code,
error_message=error_data)
def get_json(response):
"""Gets JSON representation of 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):
def __init__(self, error_code=None, error_message=None):
super(APIException, self).__init__(error_message)
self.error_code = error_code
self.error_message = error_message
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