154 lines
4.5 KiB
Python
154 lines
4.5 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright 2013 - Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import json
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import logging
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LOG = logging.getLogger(__name__)
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class Resource(object):
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resource_name = 'Something'
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defaults = {}
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def __init__(self, manager, data):
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self.manager = manager
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self._data = data
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self._set_defaults()
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self._set_attributes()
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def _set_defaults(self):
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for k, v in self.defaults.iteritems():
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if k not in self._data:
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self._data[k] = v
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def _set_attributes(self):
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for k, v in self._data.iteritems():
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try:
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setattr(self, k, v)
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except AttributeError:
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# In this case we already defined the attribute on the class
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pass
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def __str__(self):
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vals = ", ".join(["%s='%s'" % (n, v)
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for n, v in self._data.iteritems()])
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return "%s [%s]" % (self.resource_name, vals)
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def _check_items(obj, searches):
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try:
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return all(getattr(obj, attr) == value for (attr, value) in searches)
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except AttributeError:
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return False
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def extract_json(response, response_key):
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if response_key is not None:
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return get_json(response)[response_key]
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else:
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return get_json(response)
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class ResourceManager(object):
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resource_class = None
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def __init__(self, client):
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self.client = client
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def find(self, **kwargs):
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return [i for i in self.list() if _check_items(i, kwargs.items())]
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def _ensure_not_empty(self, **kwargs):
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for name, value in kwargs.iteritems():
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if value is None or (isinstance(value, str) and len(value) == 0):
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raise APIException('%s is missing field "%s"' %
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(self.resource_class.__name__, name))
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def _copy_if_defined(self, data, **kwargs):
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for name, value in kwargs.iteritems():
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if value is not None:
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data[name] = value
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def _create(self, url, data, response_key=None, dump_json=True):
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if dump_json:
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data = json.dumps(data)
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resp = self.client.http_client.post(url, data)
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if resp.status_code != 201:
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self._raise_api_exception(resp)
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return self.resource_class(self, extract_json(resp, response_key))
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def _update(self, url, data, response_key=None, dump_json=True):
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if dump_json:
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data = json.dumps(data)
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resp = self.client.http_client.put(url, data)
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if resp.status_code != 200:
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self._raise_api_exception(resp)
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return self.resource_class(self, extract_json(resp, response_key))
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def _list(self, url, response_key=None):
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resp = self.client.http_client.get(url)
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if resp.status_code == 200:
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return [self.resource_class(self, resource_data)
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for resource_data in extract_json(resp, response_key)]
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else:
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self._raise_api_exception(resp)
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def _get(self, url, response_key=None):
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resp = self.client.http_client.get(url)
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if resp.status_code == 200:
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return self.resource_class(self, extract_json(resp, response_key))
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else:
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self._raise_api_exception(resp)
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def _delete(self, url):
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resp = self.client.http_client.delete(url)
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if resp.status_code != 204:
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self._raise_api_exception(resp)
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def _plurify_resource_name(self):
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return self.resource_class.resource_name + 's'
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def _raise_api_exception(self, resp):
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error_data = get_json(resp)
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raise APIException(error_data["faultstring"])
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def get_json(response):
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"""This method provided backward compatibility with old versions
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of requests library
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"""
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json_field_or_function = getattr(response, 'json', None)
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if callable(json_field_or_function):
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return response.json()
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else:
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return json.loads(response.content)
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class APIException(Exception):
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pass
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