/usr/share/pyshared/openstack/compute/base.py is in python-openstack-compute 2.0a1-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Base utilities to build API operation managers and objects on top of.
"""
from openstack.compute.exceptions import NotFound
# Python 2.4 compat
try:
all
except NameError:
def all(iterable):
return True not in (not x for x in iterable)
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):
resp, body = self.api.client.get(url)
return [self.resource_class(self, res) for res in body[response_key]]
def _get(self, url, response_key):
resp, body = self.api.client.get(url)
return self.resource_class(self, body[response_key])
def _create(self, url, body, response_key):
resp, body = self.api.client.post(url, body=body)
return self.resource_class(self, body[response_key])
def _delete(self, url):
resp, body = self.api.client.delete(url)
def _update(self, url, body):
resp, body = self.api.client.put(url, body=body)
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:
raise NotFound(404, "No %s matching %s." % (self.resource_class.__name__, kwargs))
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 (server, flavor,
etc). This is pretty much just a bag for attributes.
"""
def __init__(self, manager, info):
self.manager = manager
self._info = info
self._add_details(info)
def _add_details(self, info):
for (k, v) in info.iteritems():
setattr(self, k, v)
def __getattr__(self, k):
self.get()
if k not in self.__dict__:
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):
new = self.manager.get(self.id)
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 getid(obj):
"""
Abstracts the common pattern of allowing both an object or an object's ID
(integer) as a parameter when dealing with relationships.
"""
try:
return obj.id
except AttributeError:
return int(obj)
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