539 lines
18 KiB
Python
539 lines
18 KiB
Python
# Copyright 2010 Jacob Kaplan-Moss
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# Copyright 2011 OpenStack Foundation
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# Copyright 2013 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""
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Base utilities to build API operation managers and objects on top of.
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"""
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import abc
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import copy
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import functools
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import warnings
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from oslo_utils import strutils
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import six
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from six.moves import urllib
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from keystoneclient import auth
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from keystoneclient import exceptions
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from keystoneclient.i18n import _
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def getid(obj):
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"""Return id if argument is a Resource.
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Abstracts the common pattern of allowing both an object or an object's ID
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(UUID) as a parameter when dealing with relationships.
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"""
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try:
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if obj.uuid:
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return obj.uuid
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except AttributeError:
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pass
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try:
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return obj.id
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except AttributeError:
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return obj
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def filter_none(**kwargs):
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"""Remove any entries from a dictionary where the value is None."""
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return dict((k, v) for k, v in six.iteritems(kwargs) if v is not None)
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def filter_kwargs(f):
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@functools.wraps(f)
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def func(*args, **kwargs):
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new_kwargs = {}
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for key, ref in six.iteritems(kwargs):
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if ref is None:
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# drop null values
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continue
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id_value = getid(ref)
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if id_value != ref:
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# If an object with an id was passed, then use the id, e.g.:
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# user: user(id=1) becomes user_id: 1
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key = '%s_id' % key
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new_kwargs[key] = id_value
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return f(*args, **new_kwargs)
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return func
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class Manager(object):
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"""Basic manager type providing common operations.
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Managers interact with a particular type of API (servers, flavors, images,
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etc.) and provide CRUD operations for them.
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:param client: instance of BaseClient descendant for HTTP requests
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"""
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resource_class = None
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def __init__(self, client):
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super(Manager, self).__init__()
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self.client = client
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@property
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def api(self):
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"""The client.
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.. warning::
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This property is deprecated as of the 1.7.0 release in favor of
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:meth:`client` and may be removed in the 2.0.0 release.
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"""
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warnings.warn(
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'api is deprecated as of the 1.7.0 release in favor of client and '
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'may be removed in the 2.0.0 release', DeprecationWarning)
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return self.client
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def _list(self, url, response_key, obj_class=None, body=None, **kwargs):
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"""List the collection.
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:param url: a partial URL, e.g., '/servers'
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:param response_key: the key to be looked up in response dictionary,
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e.g., 'servers'
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:param obj_class: class for constructing the returned objects
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(self.resource_class will be used by default)
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:param body: data that will be encoded as JSON and passed in POST
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request (GET will be sent by default)
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:param kwargs: Additional arguments will be passed to the request.
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"""
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if body:
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resp, body = self.client.post(url, body=body, **kwargs)
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else:
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resp, body = self.client.get(url, **kwargs)
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if obj_class is None:
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obj_class = self.resource_class
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data = body[response_key]
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# NOTE(ja): keystone returns values as list as {'values': [ ... ]}
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# unlike other services which just return the list...
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try:
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data = data['values']
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except (KeyError, TypeError):
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pass
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return [obj_class(self, res, loaded=True) for res in data if res]
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def _get(self, url, response_key, **kwargs):
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"""Get an object from collection.
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:param url: a partial URL, e.g., '/servers'
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:param response_key: the key to be looked up in response dictionary,
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e.g., 'server'
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:param kwargs: Additional arguments will be passed to the request.
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"""
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resp, body = self.client.get(url, **kwargs)
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return self.resource_class(self, body[response_key], loaded=True)
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def _head(self, url, **kwargs):
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"""Retrieve request headers for an object.
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:param url: a partial URL, e.g., '/servers'
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:param kwargs: Additional arguments will be passed to the request.
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"""
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resp, body = self.client.head(url, **kwargs)
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return resp.status_code == 204
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def _create(self, url, body, response_key, return_raw=False, **kwargs):
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"""Deprecated. Use `_post` instead.
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"""
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return self._post(url, body, response_key, return_raw, **kwargs)
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def _post(self, url, body, response_key, return_raw=False, **kwargs):
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"""Create an object.
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:param url: a partial URL, e.g., '/servers'
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:param body: data that will be encoded as JSON and passed in POST
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request (GET will be sent by default)
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:param response_key: the key to be looked up in response dictionary,
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e.g., 'servers'
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:param return_raw: flag to force returning raw JSON instead of
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Python object of self.resource_class
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:param kwargs: Additional arguments will be passed to the request.
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"""
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resp, body = self.client.post(url, body=body, **kwargs)
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if return_raw:
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return body[response_key]
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return self.resource_class(self, body[response_key])
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def _put(self, url, body=None, response_key=None, **kwargs):
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"""Update an object with PUT method.
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:param url: a partial URL, e.g., '/servers'
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:param body: data that will be encoded as JSON and passed in POST
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request (GET will be sent by default)
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:param response_key: the key to be looked up in response dictionary,
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e.g., 'servers'
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:param kwargs: Additional arguments will be passed to the request.
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"""
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resp, body = self.client.put(url, body=body, **kwargs)
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# PUT requests may not return a body
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if body is not None:
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if response_key is not None:
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return self.resource_class(self, body[response_key])
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else:
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return self.resource_class(self, body)
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def _patch(self, url, body=None, response_key=None, **kwargs):
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"""Update an object with PATCH method.
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:param url: a partial URL, e.g., '/servers'
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:param body: data that will be encoded as JSON and passed in POST
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request (GET will be sent by default)
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:param response_key: the key to be looked up in response dictionary,
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e.g., 'servers'
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:param kwargs: Additional arguments will be passed to the request.
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"""
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resp, body = self.client.patch(url, body=body, **kwargs)
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if response_key is not None:
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return self.resource_class(self, body[response_key])
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else:
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return self.resource_class(self, body)
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def _delete(self, url, **kwargs):
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"""Delete an object.
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:param url: a partial URL, e.g., '/servers/my-server'
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:param kwargs: Additional arguments will be passed to the request.
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"""
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return self.client.delete(url, **kwargs)
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def _update(self, url, body=None, response_key=None, method="PUT",
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**kwargs):
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methods = {"PUT": self.client.put,
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"POST": self.client.post,
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"PATCH": self.client.patch}
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try:
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resp, body = methods[method](url, body=body,
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**kwargs)
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except KeyError:
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raise exceptions.ClientException(_("Invalid update method: %s")
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% method)
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# PUT requests may not return a body
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if body:
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return self.resource_class(self, body[response_key])
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@six.add_metaclass(abc.ABCMeta)
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class ManagerWithFind(Manager):
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"""Manager with additional `find()`/`findall()` methods."""
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@abc.abstractmethod
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def list(self):
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pass
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def find(self, **kwargs):
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"""Find a single item with attributes matching ``**kwargs``.
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This isn't very efficient: it loads the entire list then filters on
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the Python side.
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"""
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rl = self.findall(**kwargs)
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num = len(rl)
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if num == 0:
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msg = _("No %(name)s matching %(kwargs)s.") % {
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'name': self.resource_class.__name__, 'kwargs': kwargs}
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raise exceptions.NotFound(404, msg)
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elif num > 1:
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raise exceptions.NoUniqueMatch
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else:
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return rl[0]
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def findall(self, **kwargs):
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"""Find all items with attributes matching ``**kwargs``.
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This isn't very efficient: it loads the entire list then filters on
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the Python side.
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"""
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found = []
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searches = kwargs.items()
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for obj in self.list():
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try:
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if all(getattr(obj, attr) == value
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for (attr, value) in searches):
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found.append(obj)
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except AttributeError:
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continue
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return found
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class CrudManager(Manager):
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"""Base manager class for manipulating Keystone entities.
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Children of this class are expected to define a `collection_key` and `key`.
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- `collection_key`: Usually a plural noun by convention (e.g. `entities`);
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used to refer collections in both URL's (e.g. `/v3/entities`) and JSON
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objects containing a list of member resources (e.g. `{'entities': [{},
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{}, {}]}`).
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- `key`: Usually a singular noun by convention (e.g. `entity`); used to
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refer to an individual member of the collection.
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"""
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collection_key = None
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key = None
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base_url = None
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def build_url(self, dict_args_in_out=None):
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"""Builds a resource URL for the given kwargs.
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Given an example collection where `collection_key = 'entities'` and
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`key = 'entity'`, the following URL's could be generated.
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By default, the URL will represent a collection of entities, e.g.::
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/entities
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If kwargs contains an `entity_id`, then the URL will represent a
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specific member, e.g.::
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/entities/{entity_id}
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If a `base_url` is provided, the generated URL will be appended to it.
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If a 'tail' is provided, it will be appended to the end of the URL.
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"""
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if dict_args_in_out is None:
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dict_args_in_out = {}
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url = dict_args_in_out.pop('base_url', None) or self.base_url or ''
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url += '/%s' % self.collection_key
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# do we have a specific entity?
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entity_id = dict_args_in_out.pop('%s_id' % self.key, None)
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if entity_id is not None:
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url += '/%s' % entity_id
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if dict_args_in_out.get('tail'):
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url += dict_args_in_out['tail']
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return url
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@filter_kwargs
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def create(self, **kwargs):
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url = self.build_url(dict_args_in_out=kwargs)
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return self._create(
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url,
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{self.key: kwargs},
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self.key)
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@filter_kwargs
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def get(self, **kwargs):
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return self._get(
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self.build_url(dict_args_in_out=kwargs),
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self.key)
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@filter_kwargs
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def head(self, **kwargs):
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return self._head(self.build_url(dict_args_in_out=kwargs))
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def _build_query(self, params):
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return '?%s' % urllib.parse.urlencode(params) if params else ''
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def build_key_only_query(self, params_list):
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"""Builds a query that does not include values, just keys.
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The Identity API has some calls that define queries without values,
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this can not be accomplished by using urllib.parse.urlencode(). This
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method builds a query using only the keys.
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"""
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return '?%s' % '&'.join(params_list) if params_list else ''
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@filter_kwargs
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def list(self, fallback_to_auth=False, **kwargs):
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if 'id' in kwargs.keys():
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# Ensure that users are not trying to call things like
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# ``domains.list(id='default')`` when they should have used
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# ``[domains.get(domain_id='default')]`` instead. Keystone supports
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# ``GET /v3/domains/{domain_id}``, not ``GET
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# /v3/domains?id={domain_id}``.
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raise TypeError(
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_("list() got an unexpected keyword argument 'id'. To "
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"retrieve a single object using a globally unique "
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"identifier, try using get() instead."))
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url = self.build_url(dict_args_in_out=kwargs)
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try:
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query = self._build_query(kwargs)
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url_query = '%(url)s%(query)s' % {'url': url, 'query': query}
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return self._list(
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url_query,
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self.collection_key)
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except exceptions.EmptyCatalog:
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if fallback_to_auth:
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return self._list(
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url_query,
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self.collection_key,
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endpoint_filter={'interface': auth.AUTH_INTERFACE})
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else:
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raise
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@filter_kwargs
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def put(self, **kwargs):
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return self._update(
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self.build_url(dict_args_in_out=kwargs),
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method='PUT')
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@filter_kwargs
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def update(self, **kwargs):
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url = self.build_url(dict_args_in_out=kwargs)
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return self._update(
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url,
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{self.key: kwargs},
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self.key,
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method='PATCH')
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@filter_kwargs
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def delete(self, **kwargs):
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return self._delete(
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self.build_url(dict_args_in_out=kwargs))
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@filter_kwargs
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def find(self, **kwargs):
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"""Find a single item with attributes matching ``**kwargs``."""
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url = self.build_url(dict_args_in_out=kwargs)
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query = self._build_query(kwargs)
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rl = self._list(
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'%(url)s%(query)s' % {
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'url': url,
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'query': query,
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},
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self.collection_key)
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num = len(rl)
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if num == 0:
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msg = _("No %(name)s matching %(kwargs)s.") % {
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'name': self.resource_class.__name__, 'kwargs': kwargs}
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raise exceptions.NotFound(404, msg)
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elif num > 1:
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raise exceptions.NoUniqueMatch
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else:
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return rl[0]
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class Resource(object):
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"""Base class for OpenStack resources (tenant, user, etc.).
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This is pretty much just a bag for attributes.
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"""
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HUMAN_ID = False
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NAME_ATTR = 'name'
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def __init__(self, manager, info, loaded=False):
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"""Populate and bind to a manager.
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:param manager: BaseManager object
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:param info: dictionary representing resource attributes
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:param loaded: prevent lazy-loading if set to True
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"""
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self.manager = manager
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self._info = info
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self._add_details(info)
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self._loaded = loaded
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def __repr__(self):
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reprkeys = sorted(k
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for k in self.__dict__.keys()
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if k[0] != '_' and k != 'manager')
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info = ", ".join("%s=%s" % (k, getattr(self, k)) for k in reprkeys)
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return "<%s %s>" % (self.__class__.__name__, info)
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@property
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def human_id(self):
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"""Human-readable ID which can be used for bash completion.
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"""
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if self.HUMAN_ID:
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name = getattr(self, self.NAME_ATTR, None)
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if name is not None:
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return strutils.to_slug(name)
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return None
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def _add_details(self, info):
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for (k, v) in six.iteritems(info):
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try:
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setattr(self, k, v)
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self._info[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 __getattr__(self, k):
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if k not in self.__dict__:
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# NOTE(bcwaldon): disallow lazy-loading if already loaded once
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if not self.is_loaded():
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self.get()
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return self.__getattr__(k)
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raise AttributeError(k)
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else:
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return self.__dict__[k]
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def get(self):
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"""Support for lazy loading details.
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Some clients, such as novaclient have the option to lazy load the
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details, details which can be loaded with this function.
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"""
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# set_loaded() first ... so if we have to bail, we know we tried.
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self.set_loaded(True)
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if not hasattr(self.manager, 'get'):
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return
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new = self.manager.get(self.id)
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if new:
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self._add_details(new._info)
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self._add_details(
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{'x_request_id': self.manager.client.last_request_id})
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def __eq__(self, other):
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if not isinstance(other, Resource):
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return NotImplemented
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# two resources of different types are not equal
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if not isinstance(other, self.__class__):
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return False
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if hasattr(self, 'id') and hasattr(other, 'id'):
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return self.id == other.id
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return self._info == other._info
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def is_loaded(self):
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return self._loaded
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def set_loaded(self, val):
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self._loaded = val
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def to_dict(self):
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return copy.deepcopy(self._info)
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def delete(self):
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return self.manager.delete(self)
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