freezerclient.utils

Source code for freezerclient.utils

# (c) Copyright 2014-2016 Hewlett-Packard Development Company, L.P.
#
# 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

logging = logging.getLogger(__name__)


[docs]class Namespace(dict): """A dict subclass that exposes its items as attributes. Warning: Namespace instances do not have direct access to the dict methods. """ def __init__(self, obj={}): super(Namespace, self).__init__(obj) def __dir__(self): return tuple(self) def __repr__(self): return "%s(%s)" % (type(self).__name__, super(Namespace, self).__repr__()) def __getattribute__(self, name): try: return self[name] except KeyError: # Return None in case the value doesn't exists # this is not an issue for the apiclient because it skips # None values return None def __setattr__(self, name, value): self[name] = value def __delattr__(self, name): del self[name]
[docs] @classmethod def from_object(cls, obj, names=None): if names is None: names = dir(obj) ns = {name: getattr(obj, name) for name in names} return cls(ns)
[docs] @classmethod def from_mapping(cls, ns, names=None): if names: ns = {name: ns[name] for name in names} return cls(ns)
[docs] @classmethod def from_sequence(cls, seq, names=None): if names: seq = {name: val for name, val in seq if name in names} return cls(seq)
[docs] @staticmethod def hasattr(ns, name): try: object.__getattribute__(ns, name) except AttributeError: return False return True
[docs] @staticmethod def getattr(ns, name): return object.__getattribute__(ns, name)
[docs] @staticmethod def setattr(ns, name, value): return object.__setattr__(ns, name, value)
[docs] @staticmethod def delattr(ns, name): return object.__delattr__(ns, name)
[docs]class CachedProperty(object): def __init__(self, func): self.__doc__ = getattr(func, '__doc__') self.func = func def __get__(self, obj, cls): if obj is None: return self value = obj.__dict__[self.func.__name__] = self.func(obj) return value
[docs]def doc_from_json_file(path_to_file): """Build a json from a file in the file system :param path_to_file: path to file :return: in memory file in json format """ with open(path_to_file, 'rb') as fd: try: return json.load(fd) except Exception as err: logging.error(err) raise Exception('Unable to load conf file. {0}'.format(err))
[docs]def create_headers_for_request(token): """Create a header dict to be passed to the api. :param token: token string coming from the api :return: a dict containing all the headers for a request """ return { 'X-Auth-Token': token, 'Content-Type': 'application/json', 'Accept': 'application/json' }
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