/usr/share/pyshared/keystoneclient/base.py is in python-keystoneclient 2012.1-3+deb7u1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 | # Copyright 2010 Jacob Kaplan-Moss
# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
# 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.
"""
Base utilities to build API operation managers and objects on top of.
"""
from keystoneclient import exceptions
# Python 2.4 compat
try:
all
except NameError:
def all(iterable):
return True not in (not x for x in iterable)
def getid(obj):
"""
Abstracts the common pattern of allowing both an object or an object's ID
(UUID) as a parameter when dealing with relationships.
"""
# Try to return the object's UUID first, if we have a UUID.
try:
if obj.uuid:
return obj.uuid
except AttributeError:
pass
try:
return obj.id
except AttributeError:
return obj
class Manager(object):
"""
Managers interact with a particular type of API (servers, flavors, images,
etc.) and provide CRUD operations for them.
"""
resource_class = None
def __init__(self, api):
self.api = api
def _list(self, url, response_key, obj_class=None, body=None):
resp = None
if body:
resp, body = self.api.post(url, body=body)
else:
resp, body = self.api.get(url)
if obj_class is None:
obj_class = self.resource_class
data = body[response_key]
# NOTE(ja): keystone returns values as list as {'values': [ ... ]}
# unlike other services which just return the list...
if type(data) is dict:
data = data['values']
return [obj_class(self, res, loaded=True) for res in data if res]
def _get(self, url, response_key):
resp, body = self.api.get(url)
return self.resource_class(self, body[response_key])
def _create(self, url, body, response_key, return_raw=False):
resp, body = self.api.post(url, body=body)
if return_raw:
return body[response_key]
return self.resource_class(self, body[response_key])
def _delete(self, url):
resp, body = self.api.delete(url)
def _update(self, url, body, response_key=None, method="PUT"):
methods = {"PUT": self.api.put,
"POST": self.api.post}
try:
resp, body = methods[method](url, body=body)
except KeyError:
raise exceptions.ClientException("Invalid update method: %s"
% method)
# PUT requests may not return a body
if body:
return self.resource_class(self, body[response_key])
class ManagerWithFind(Manager):
"""
Like a `Manager`, but with additional `find()`/`findall()` methods.
"""
def find(self, **kwargs):
"""
Find a single item with attributes matching ``**kwargs``.
This isn't very efficient: it loads the entire list then filters on
the Python side.
"""
rl = self.findall(**kwargs)
try:
return rl[0]
except IndexError:
msg = "No %s matching %s." % (self.resource_class.__name__, kwargs)
raise exceptions.NotFound(404, msg)
def findall(self, **kwargs):
"""
Find all items with attributes matching ``**kwargs``.
This isn't very efficient: it loads the entire list then filters on
the Python side.
"""
found = []
searches = kwargs.items()
for obj in self.list():
try:
if all(getattr(obj, attr) == value
for (attr, value) in searches):
found.append(obj)
except AttributeError:
continue
return found
class Resource(object):
"""
A resource represents a particular instance of an object (tenant, user,
etc). This is pretty much just a bag for attributes.
:param manager: Manager object
:param info: dictionary representing resource attributes
:param loaded: prevent lazy-loading if set to True
"""
def __init__(self, manager, info, loaded=False):
self.manager = manager
self._info = info
self._add_details(info)
self._loaded = loaded
def _add_details(self, info):
for (k, v) in info.iteritems():
setattr(self, k, v)
def __getattr__(self, k):
if k not in self.__dict__:
#NOTE(bcwaldon): disallow lazy-loading if already loaded once
if not self.is_loaded():
self.get()
return self.__getattr__(k)
raise AttributeError(k)
else:
return self.__dict__[k]
def __repr__(self):
reprkeys = sorted(k for k in self.__dict__.keys() if k[0] != '_' and
k != 'manager')
info = ", ".join("%s=%s" % (k, getattr(self, k)) for k in reprkeys)
return "<%s %s>" % (self.__class__.__name__, info)
def get(self):
# set_loaded() first ... so if we have to bail, we know we tried.
self.set_loaded(True)
if not hasattr(self.manager, 'get'):
return
new = self.manager.get(self.id)
if new:
self._add_details(new._info)
def __eq__(self, other):
if not isinstance(other, self.__class__):
return False
if hasattr(self, 'id') and hasattr(other, 'id'):
return self.id == other.id
return self._info == other._info
def is_loaded(self):
return self._loaded
def set_loaded(self, val):
self._loaded = val
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