# 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 inspect
import six
from novaclient import exceptions
from novaclient.openstack.common.apiclient import base
from novaclient import utils
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(utils.HookableMixin):
"""
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 _write_object_to_completion_cache(self, obj):
if hasattr(self.api, 'write_object_to_completion_cache'):
self.api.write_object_to_completion_cache(obj)
def _clear_completion_cache_for_class(self, obj_class):
if hasattr(self.api, 'clear_completion_cache_for_class'):
self.api.clear_completion_cache_for_class(obj_class)
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
self._clear_completion_cache_for_class(obj_class)
objs = []
for res in data:
if res:
obj = obj_class(self, res, loaded=True)
self._write_object_to_completion_cache(obj)
objs.append(obj)
return objs
def _get(self, url, response_key):
_resp, body = self.api.client.get(url)
obj = self.resource_class(self, body[response_key], loaded=True)
self._write_object_to_completion_cache(obj)
return obj
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]
obj = self.resource_class(self, body[response_key])
self._write_object_to_completion_cache(obj)
return obj
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``.
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(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 = 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()
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]
if len(mapping_parts) == 1:
bdm_dict['volume_id'] = source_id
elif len(mapping_parts) > 1:
source_type = mapping_parts[1]
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