OpenStack Compute (Nova) Client
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python-novaclient/novaclient/base.py

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# 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 abc
import contextlib
import hashlib
import inspect
import os
import threading
import six
from novaclient import exceptions
from novaclient.openstack.common.apiclient import base
from novaclient.openstack.common import cliutils
Resource = base.Resource
def getid(obj):
"""
Abstracts the common pattern of allowing both an object or an object's ID
as a parameter when dealing with relationships.
"""
try:
return obj.id
except AttributeError:
return obj
class Manager(base.HookableMixin):
"""
Managers interact with a particular type of API (servers, flavors, images,
etc.) and provide CRUD operations for them.
"""
resource_class = None
cache_lock = threading.RLock()
def __init__(self, api):
self.api = api
def _list(self, url, response_key, obj_class=None, body=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 alternate_service_type(self, service_type):
original_service_type = self.api.client.service_type
self.api.client.service_type = service_type
try:
yield
finally:
self.api.client.service_type = original_service_type
@contextlib.contextmanager
def completion_cache(self, cache_type, obj_class, mode):
"""
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.
"""
# NOTE(wryan): This lock protects read and write access to the
# completion caches
with self.cache_lock:
base_dir = cliutils.env('NOVACLIENT_UUID_CACHE_DIR',
default="~/.novaclient")
# NOTE(sirp): Keep separate UUID caches for each username +
# endpoint pair
username = cliutils.env('OS_USERNAME', 'NOVA_USERNAME')
url = cliutils.env('OS_URL', 'NOVA_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):
_resp, body = self.api.client.get(url)
return self.resource_class(self, body[response_key], 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)
@six.add_metaclass(abc.ABCMeta)
class ManagerWithFind(Manager):
"""
Like a `Manager`, but with additional `find()`/`findall()` methods.
"""
@abc.abstractmethod
def list(self):
pass
def find(self, **kwargs):
"""
Find a single item with attributes matching ``**kwargs``.
"""
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``.
"""
found = []
searches = kwargs.items()
detailed = True
list_kwargs = {}
list_argspec = inspect.getargspec(self.list)
if 'detailed' in list_argspec.args:
detailed = ("human_id" not in kwargs and
"name" not in kwargs and
"display_name" not in kwargs)
list_kwargs['detailed'] = detailed
if 'is_public' in list_argspec.args and 'is_public' in kwargs:
is_public = kwargs['is_public']
list_kwargs['is_public'] = is_public
if is_public is None:
tmp_kwargs = kwargs.copy()
del tmp_kwargs['is_public']
searches = tmp_kwargs.items()
if 'search_opts' in list_argspec.args:
# pass search_opts in to do server side based filtering.
# TODO(jogo) not all search_opts support regex, find way to
# identify when to use regex and when to use string matching.
# volumes does not support regex while servers does. So when
# doing findall on servers some client side filtering is still
# needed.
if "human_id" in kwargs:
list_kwargs['search_opts'] = {"name": kwargs["human_id"]}
elif "name" in kwargs:
list_kwargs['search_opts'] = {"name": kwargs["name"]}
elif "display_name" in kwargs:
list_kwargs['search_opts'] = {"name": kwargs["display_name"]}
if "all_tenants" in kwargs:
all_tenants = kwargs['all_tenants']
list_kwargs['search_opts']['all_tenants'] = all_tenants
searches = [(k, v) for k, v in searches if k != 'all_tenants']
listing = self.list(**list_kwargs)
for obj in listing:
try:
if all(getattr(obj, attr) == value
for (attr, value) in searches):
if detailed:
found.append(obj)
else:
found.append(self.get(obj.id))
except AttributeError:
continue
return found
class BootingManagerWithFind(ManagerWithFind):
"""Like a `ManagerWithFind`, but has the ability to boot servers."""
def _parse_block_device_mapping(self, block_device_mapping):
bdm = []
for device_name, mapping in six.iteritems(block_device_mapping):
#
# The mapping is in the format:
# <id>:[<type>]:[<size(GB)>]:[<delete_on_terminate>]
#
bdm_dict = {'device_name': device_name}
mapping_parts = mapping.split(':')
source_id = mapping_parts[0]
bdm_dict['uuid'] = source_id
bdm_dict['boot_index'] = 0
if len(mapping_parts) == 1:
bdm_dict['volume_id'] = source_id
bdm_dict['source_type'] = 'volume'
elif len(mapping_parts) > 1:
source_type = mapping_parts[1]
bdm_dict['source_type'] = source_type
if source_type.startswith('snap'):
bdm_dict['snapshot_id'] = source_id
else:
bdm_dict['volume_id'] = source_id
if len(mapping_parts) > 2 and mapping_parts[2]:
bdm_dict['volume_size'] = str(int(mapping_parts[2]))
if len(mapping_parts) > 3:
bdm_dict['delete_on_termination'] = mapping_parts[3]
bdm.append(bdm_dict)
return bdm