ChangBo Guo(gcb) c8bb1a2755 Remove copy of incubated Oslo code
The Oslo team has moved all previously incubated code from the
openstack/oslo-incubator repository into separate library repositories
and released those libraries to the Python Package Index. Many of our
big tent project teams are still using the old, unsupported, incubated
versions of the code. The Oslo team has been working to remove that
incubated code from projects, and the time has come to finish that work.

As one of community-wide goals in Ocata, please see:
https://github.com/openstack/governance/blob/master/goals/ocata/remove-incubated-oslo-code.rst

Note: This commit also fix pep8 violations.
Change-Id: I03288adb94c702d1d63df88ef9ba33a2ff59eaa3
2016-09-28 10:06:45 +08:00

217 lines
7.2 KiB
Python

# Copyright 2010 Jacob Kaplan-Moss
# Copyright 2011 OpenStack Foundation
# 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.
"""
import contextlib
import hashlib
import os
from manilaclient.common import cliutils
from manilaclient import exceptions
from manilaclient import utils
# Python 2.4 compat
try:
all
except NameError:
def all(iterable):
return True not in (not x for x in iterable)
class Manager(utils.HookableMixin):
"""Manager for CRUD operations.
Managers interact with a particular type of API (shares, snapshots,
etc.) and provide CRUD operations for them.
"""
resource_class = None
def __init__(self, api):
self.api = api
self.client = api.client
@property
def api_version(self):
return self.api.api_version
def _list(self, url, response_key, obj_class=None, body=None):
resp = None
if body:
resp, body = self.api.client.post(url, body=body)
else:
resp, body = self.api.client.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 isinstance(data, dict):
try:
data = data['values']
except KeyError:
pass
with self.completion_cache('human_id', obj_class, mode="w"):
with self.completion_cache('uuid', obj_class, mode="w"):
return [obj_class(self, res, loaded=True)
for res in data if res]
@contextlib.contextmanager
def completion_cache(self, cache_type, obj_class, mode):
"""Bash autocompletion items storage.
The completion cache store items that can be used for bash
autocompletion, like UUIDs or human-friendly IDs.
A resource listing will clear and repopulate the cache.
A resource create will append to the cache.
Delete is not handled because listings are assumed to be performed
often enough to keep the cache reasonably up-to-date.
"""
base_dir = cliutils.env('manilaclient_UUID_CACHE_DIR',
'MANILACLIENT_UUID_CACHE_DIR',
default="~/.manilaclient")
# NOTE(sirp): Keep separate UUID caches for each username + endpoint
# pair
username = cliutils.env('OS_USERNAME', 'MANILA_USERNAME')
url = cliutils.env('OS_URL', 'MANILA_URL')
uniqifier = hashlib.md5(username.encode('utf-8') +
url.encode('utf-8')).hexdigest()
cache_dir = os.path.expanduser(os.path.join(base_dir, uniqifier))
try:
os.makedirs(cache_dir, 0o755)
except OSError:
# NOTE(kiall): This is typically either permission denied while
# attempting to create the directory, or the directory
# already exists. Either way, don't fail.
pass
resource = obj_class.__name__.lower()
filename = "%s-%s-cache" % (resource, cache_type.replace('_', '-'))
path = os.path.join(cache_dir, filename)
cache_attr = "_%s_cache" % cache_type
try:
setattr(self, cache_attr, open(path, mode))
except IOError:
# NOTE(kiall): This is typically a permission denied while
# attempting to write the cache file.
pass
try:
yield
finally:
cache = getattr(self, cache_attr, None)
if cache:
cache.close()
delattr(self, cache_attr)
def write_to_completion_cache(self, cache_type, val):
cache = getattr(self, "_%s_cache" % cache_type, None)
if cache:
cache.write("%s\n" % val)
def _get(self, url, response_key=None):
resp, body = self.api.client.get(url)
if response_key:
return self.resource_class(self, body[response_key], loaded=True)
else:
return self.resource_class(self, body, loaded=True)
def _get_with_base_url(self, url, response_key=None):
resp, body = self.api.client.get_with_base_url(url)
if response_key:
return [self.resource_class(self, res, loaded=True)
for res in body[response_key] if res]
else:
return self.resource_class(self, body, loaded=True)
def _create(self, url, body, response_key, return_raw=False, **kwargs):
self.run_hooks('modify_body_for_create', body, **kwargs)
resp, body = self.api.client.post(url, body=body)
if return_raw:
return body[response_key]
with self.completion_cache('human_id', self.resource_class, mode="a"):
with self.completion_cache('uuid', self.resource_class, mode="a"):
return self.resource_class(self, body[response_key])
def _delete(self, url):
resp, body = self.api.client.delete(url)
def _update(self, url, body, response_key=None, **kwargs):
self.run_hooks('modify_body_for_update', body, **kwargs)
resp, body = self.api.client.put(url, body=body)
if body:
if response_key:
return self.resource_class(self, body[response_key])
else:
return self.resource_class(self, 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.
"""
matches = self.findall(**kwargs)
num_matches = len(matches)
if num_matches == 0:
msg = "No %s matching %s." % (self.resource_class.__name__, kwargs)
raise exceptions.NotFound(404, msg)
elif num_matches > 1:
raise exceptions.NoUniqueMatch
else:
return matches[0]
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 = list(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
def list(self):
raise NotImplementedError