/usr/lib/python2.7/dist-packages/seamicroclient/base.py is in python-seamicroclient 0.2.0-0ubuntu1.
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# 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 time
import six
from seamicroclient import exceptions
from seamicroclient.openstack.common import strutils
from seamicroclient import utils
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, storage
etc.) and provide CRUD operations for them.
"""
resource_class = None
def __init__(self, api):
self.api = api
def _list(self, url, body=None, filters=None):
if body:
_resp, body = self.api.client.post(url, body=body)
else:
_resp, body = self.api.client.get(url)
obj_class = self.resource_class
data = body
output = []
for k, v in data.iteritems():
if data[k]:
v.update({'id': k})
output.append(obj_class(self, v, loaded=True))
filtered_output = set()
if filters is not None:
for k, v in filters.iteritems():
for item in output:
if isinstance(v, basestring):
if v in getattr(item, k):
output.add(item)
else:
if item in output:
output.remove(item)
elif isinstance(v, int):
if v == getattr(item, k):
output.add(item)
else:
if item in output:
output.remove(item)
else:
continue
return filtered_output
return output
def _get(self, id, url):
_resp, body = self.api.client.get(url)
body.update({'id': id})
return self.resource_class(self, body)
def _create(self, url, body, return_raw=False, **kwargs):
self.run_hooks('modify_body_for_create', body, **kwargs)
_resp, body = self.api.client.post(url, body=body)
if isinstance(body, basestring):
return body.partition('/')[-1]
if return_raw:
return body
for k, v in body.iteritems():
v.update({'id': k})
return self.resource_class(self, v)
def _delete(self, url):
_resp, _body = self.api.client.delete(url)
def _update(self, url, body, **kwargs):
self.run_hooks('modify_body_for_update', body, **kwargs)
_resp, body = self.api.client.put(url, body=body)
if body:
if isinstance(body, basestring):
return body.partition('/')[-1]
if body == kwargs.get('action'):
return
for k, v in body.iteritems():
v.update({'id': k})
return self.resource_class(self, v)
@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(404, msg)
elif num_matches > 1:
raise exceptions.NoUniqueMatch
else:
return matches[0]
def findall(self, **kwargs):
"""
Find all items with attributes matching ``**kwargs``.
To find volume with size less than equal to 500 GB and id contains
'ironic'
kwargs = {'freeSize_le': 500, 'id_has': 'ironic', "UsedSize": 300}
Operator:
no operator required for "equal to" checks
_le: less than equal to
_ge: greater than equal to
_has: contains string
This isn't very efficient: it loads the entire list then filters on
the Python side.
"""
found = []
searches = kwargs.items()
listing = self.list()
for obj in listing:
try:
for attr, value in searches:
if attr.endswith('_eq'):
if getattr(obj, attr) == value:
found.append(obj)
elif attr.endswith('_le'):
if getattr(obj, attr) <= value:
found.append(obj)
elif attr.endswith('_ge'):
if getattr(obj, attr) >= value:
found.append(obj)
elif attr.endswith('_has'):
if value in getattr(obj, attr):
found.append(obj)
else:
if getattr(obj, attr) == value:
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.
:param manager: Manager object
:param info: dictionary representing resource attributes
:param loaded: prevent lazy-loading if set to True
"""
HUMAN_ID = False
NAME_ATTR = 'id'
def __init__(self, manager, info, loaded=False):
self.manager = manager
self._info = info
self._add_details(info)
self._loaded = loaded
@property
def human_id(self):
"""Subclasses may override this provide a pretty ID which can be used
for bash completion.
"""
if self.NAME_ATTR in self.__dict__ and self.HUMAN_ID:
return strutils.to_slug(getattr(self, self.NAME_ATTR))
return None
def _add_details(self, info):
for (k, v) in six.iteritems(info):
try:
setattr(self, k, v)
self._info[k] = v
except AttributeError:
# In this case we already defined the attribute on the class
pass
def __getattr__(self, k):
if k not in self.__dict__:
# NOTE(rk): disallow lazy-loading if already loaded once
if not self.is_loaded():
self.get()
return self.__getattr__(k)
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):
# set_loaded() first ... so if we have to bail, we know we tried.
self.set_loaded(True)
if not hasattr(self.manager, 'get'):
return
new = self.manager.get(self.id)
if new:
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 is_loaded(self):
return self._loaded
def set_loaded(self, val):
self._loaded = val
def refresh(self, sleep=None):
if sleep:
time.sleep(sleep)
return self.manager.get(self.id)
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