c7dce2adec
Normally the underlying value of an object attribute is set upon first attempt to set it and would not exist otherwise. This causes the object attribute access mechanism to fall back to obj_load_attr. This is mostly fine for a lot of use cases, but it also means that for ObjectListBase subclasses, it is not possible to construct them empty and then call list methods on them without resorting to something like: myListObject(objects=[]) This patch makes ObjectListBase default it's objects filed to [] if it's not passed in allowing us to have a cleaner API and call list methods such as len() on objects constructed on the fly.. Change-Id: Iad1301cc4f88018f10f3dd6c76e35275cd0c51f6
677 lines
25 KiB
Python
677 lines
25 KiB
Python
# Copyright 2013 IBM Corp.
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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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"""Nova common internal object model"""
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import collections
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import copy
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import functools
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import netaddr
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from oslo import messaging
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import six
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from nova import context
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from nova import exception
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from nova import objects
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from nova.objects import fields
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import log as logging
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from nova.openstack.common import versionutils
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LOG = logging.getLogger('object')
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class NotSpecifiedSentinel:
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pass
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def get_attrname(name):
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"""Return the mangled name of the attribute's underlying storage."""
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return '_%s' % name
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def make_class_properties(cls):
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# NOTE(danms/comstud): Inherit fields from super classes.
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# mro() returns the current class first and returns 'object' last, so
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# those can be skipped. Also be careful to not overwrite any fields
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# that already exist. And make sure each cls has its own copy of
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# fields and that it is not sharing the dict with a super class.
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cls.fields = dict(cls.fields)
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for supercls in cls.mro()[1:-1]:
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if not hasattr(supercls, 'fields'):
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continue
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for name, field in supercls.fields.items():
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if name not in cls.fields:
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cls.fields[name] = field
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for name, field in cls.fields.iteritems():
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if not isinstance(field, fields.Field):
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raise exception.ObjectFieldInvalid(
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field=name, objname=cls.obj_name())
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def getter(self, name=name):
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attrname = get_attrname(name)
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if not hasattr(self, attrname):
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self.obj_load_attr(name)
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return getattr(self, attrname)
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def setter(self, value, name=name, field=field):
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attrname = get_attrname(name)
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field_value = field.coerce(self, name, value)
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if field.read_only and hasattr(self, attrname):
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# Note(yjiang5): _from_db_object() may iterate
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# every field and write, no exception in such situation.
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if getattr(self, attrname) != field_value:
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raise exception.ReadOnlyFieldError(field=name)
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else:
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return
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self._changed_fields.add(name)
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try:
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return setattr(self, attrname, field_value)
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except Exception:
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attr = "%s.%s" % (self.obj_name(), name)
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LOG.exception(_('Error setting %(attr)s') %
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{'attr': attr})
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raise
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setattr(cls, name, property(getter, setter))
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class NovaObjectMetaclass(type):
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"""Metaclass that allows tracking of object classes."""
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# NOTE(danms): This is what controls whether object operations are
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# remoted. If this is not None, use it to remote things over RPC.
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indirection_api = None
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def __init__(cls, names, bases, dict_):
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if not hasattr(cls, '_obj_classes'):
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# This means this is a base class using the metaclass. I.e.,
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# the 'NovaObject' class.
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cls._obj_classes = collections.defaultdict(list)
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return
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def _vers_tuple(obj):
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return tuple([int(x) for x in obj.VERSION.split(".")])
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# Add the subclass to NovaObject._obj_classes. If the
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# same version already exists, replace it. Otherwise,
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# keep the list with newest version first.
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make_class_properties(cls)
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obj_name = cls.obj_name()
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for i, obj in enumerate(cls._obj_classes[obj_name]):
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if cls.VERSION == obj.VERSION:
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cls._obj_classes[obj_name][i] = cls
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# Update nova.objects with this newer class.
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setattr(objects, obj_name, cls)
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break
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if _vers_tuple(cls) > _vers_tuple(obj):
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# Insert before.
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cls._obj_classes[obj_name].insert(i, cls)
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if i == 0:
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# Later version than we've seen before. Update
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# nova.objects.
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setattr(objects, obj_name, cls)
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break
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else:
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cls._obj_classes[obj_name].append(cls)
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# Either this is the first time we've seen the object or it's
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# an older version than anything we'e seen. Update nova.objects
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# only if it's the first time we've seen this object name.
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if not hasattr(objects, obj_name):
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setattr(objects, obj_name, cls)
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# These are decorators that mark an object's method as remotable.
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# If the metaclass is configured to forward object methods to an
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# indirection service, these will result in making an RPC call
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# instead of directly calling the implementation in the object. Instead,
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# the object implementation on the remote end will perform the
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# requested action and the result will be returned here.
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def remotable_classmethod(fn):
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"""Decorator for remotable classmethods."""
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@functools.wraps(fn)
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def wrapper(cls, context, *args, **kwargs):
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if NovaObject.indirection_api:
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result = NovaObject.indirection_api.object_class_action(
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context, cls.obj_name(), fn.__name__, cls.VERSION,
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args, kwargs)
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else:
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result = fn(cls, context, *args, **kwargs)
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if isinstance(result, NovaObject):
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result._context = context
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return result
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# NOTE(danms): Make this discoverable
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wrapper.remotable = True
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wrapper.original_fn = fn
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return classmethod(wrapper)
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# See comment above for remotable_classmethod()
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#
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# Note that this will use either the provided context, or the one
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# stashed in the object. If neither are present, the object is
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# "orphaned" and remotable methods cannot be called.
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def remotable(fn):
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"""Decorator for remotable object methods."""
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@functools.wraps(fn)
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def wrapper(self, *args, **kwargs):
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ctxt = self._context
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try:
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if isinstance(args[0], (context.RequestContext)):
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ctxt = args[0]
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args = args[1:]
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except IndexError:
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pass
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if ctxt is None:
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raise exception.OrphanedObjectError(method=fn.__name__,
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objtype=self.obj_name())
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# Force this to be set if it wasn't before.
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self._context = ctxt
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if NovaObject.indirection_api:
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updates, result = NovaObject.indirection_api.object_action(
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ctxt, self, fn.__name__, args, kwargs)
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for key, value in updates.iteritems():
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if key in self.fields:
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field = self.fields[key]
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self[key] = field.from_primitive(self, key, value)
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self.obj_reset_changes()
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self._changed_fields = set(updates.get('obj_what_changed', []))
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return result
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else:
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return fn(self, ctxt, *args, **kwargs)
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wrapper.remotable = True
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wrapper.original_fn = fn
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return wrapper
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@six.add_metaclass(NovaObjectMetaclass)
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class NovaObject(object):
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"""Base class and object factory.
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This forms the base of all objects that can be remoted or instantiated
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via RPC. Simply defining a class that inherits from this base class
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will make it remotely instantiatable. Objects should implement the
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necessary "get" classmethod routines as well as "save" object methods
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as appropriate.
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"""
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# Object versioning rules
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#
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# Each service has its set of objects, each with a version attached. When
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# a client attempts to call an object method, the server checks to see if
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# the version of that object matches (in a compatible way) its object
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# implementation. If so, cool, and if not, fail.
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VERSION = '1.0'
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# The fields present in this object as key:field pairs. For example:
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#
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# fields = { 'foo': fields.IntegerField(),
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# 'bar': fields.StringField(),
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# }
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fields = {}
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obj_extra_fields = []
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def __init__(self, context=None, **kwargs):
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self._changed_fields = set()
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self._context = context
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for key in kwargs.keys():
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self[key] = kwargs[key]
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@classmethod
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def obj_name(cls):
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"""Return a canonical name for this object which will be used over
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the wire for remote hydration.
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"""
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return cls.__name__
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@classmethod
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def obj_class_from_name(cls, objname, objver):
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"""Returns a class from the registry based on a name and version."""
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if objname not in cls._obj_classes:
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LOG.error(_('Unable to instantiate unregistered object type '
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'%(objtype)s') % dict(objtype=objname))
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raise exception.UnsupportedObjectError(objtype=objname)
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# NOTE(comstud): If there's not an exact match, return the highest
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# compatible version. The objects stored in the class are sorted
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# such that highest version is first, so only set compatible_match
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# once below.
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compatible_match = None
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for objclass in cls._obj_classes[objname]:
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if objclass.VERSION == objver:
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return objclass
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if (not compatible_match and
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versionutils.is_compatible(objver, objclass.VERSION)):
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compatible_match = objclass
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if compatible_match:
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return compatible_match
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# As mentioned above, latest version is always first in the list.
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latest_ver = cls._obj_classes[objname][0].VERSION
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raise exception.IncompatibleObjectVersion(objname=objname,
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objver=objver,
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supported=latest_ver)
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@classmethod
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def _obj_from_primitive(cls, context, objver, primitive):
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self = cls()
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self._context = context
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self.VERSION = objver
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objdata = primitive['nova_object.data']
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changes = primitive.get('nova_object.changes', [])
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for name, field in self.fields.items():
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if name in objdata:
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setattr(self, name, field.from_primitive(self, name,
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objdata[name]))
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self._changed_fields = set([x for x in changes if x in self.fields])
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return self
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@classmethod
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def obj_from_primitive(cls, primitive, context=None):
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"""Object field-by-field hydration."""
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if primitive['nova_object.namespace'] != 'nova':
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# NOTE(danms): We don't do anything with this now, but it's
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# there for "the future"
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raise exception.UnsupportedObjectError(
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objtype='%s.%s' % (primitive['nova_object.namespace'],
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primitive['nova_object.name']))
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objname = primitive['nova_object.name']
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objver = primitive['nova_object.version']
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objclass = cls.obj_class_from_name(objname, objver)
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return objclass._obj_from_primitive(context, objver, primitive)
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def __deepcopy__(self, memo):
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"""Efficiently make a deep copy of this object."""
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# NOTE(danms): A naive deepcopy would copy more than we need,
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# and since we have knowledge of the volatile bits of the
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# object, we can be smarter here. Also, nested entities within
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# some objects may be uncopyable, so we can avoid those sorts
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# of issues by copying only our field data.
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nobj = self.__class__()
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nobj._context = self._context
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for name in self.fields:
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if self.obj_attr_is_set(name):
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nval = copy.deepcopy(getattr(self, name), memo)
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setattr(nobj, name, nval)
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nobj._changed_fields = set(self._changed_fields)
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return nobj
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def obj_clone(self):
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"""Create a copy."""
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return copy.deepcopy(self)
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def obj_make_compatible(self, primitive, target_version):
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"""Make an object representation compatible with a target version.
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This is responsible for taking the primitive representation of
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an object and making it suitable for the given target_version.
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This may mean converting the format of object attributes, removing
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attributes that have been added since the target version, etc.
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:param:primitive: The result of self.obj_to_primitive()
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:param:target_version: The version string requested by the recipient
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of the object.
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:param:raises: nova.exception.UnsupportedObjectError if conversion
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is not possible for some reason.
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"""
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pass
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def obj_to_primitive(self, target_version=None):
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"""Simple base-case dehydration.
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This calls to_primitive() for each item in fields.
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"""
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primitive = dict()
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for name, field in self.fields.items():
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if self.obj_attr_is_set(name):
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primitive[name] = field.to_primitive(self, name,
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getattr(self, name))
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if target_version:
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self.obj_make_compatible(primitive, target_version)
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obj = {'nova_object.name': self.obj_name(),
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'nova_object.namespace': 'nova',
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'nova_object.version': target_version or self.VERSION,
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'nova_object.data': primitive}
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if self.obj_what_changed():
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obj['nova_object.changes'] = list(self.obj_what_changed())
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return obj
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def obj_load_attr(self, attrname):
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"""Load an additional attribute from the real object.
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This should use self._conductor, and cache any data that might
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be useful for future load operations.
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"""
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raise NotImplementedError(
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_("Cannot load '%s' in the base class") % attrname)
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def save(self, context):
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"""Save the changed fields back to the store.
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This is optional for subclasses, but is presented here in the base
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class for consistency among those that do.
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"""
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raise NotImplementedError('Cannot save anything in the base class')
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def obj_what_changed(self):
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"""Returns a set of fields that have been modified."""
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changes = set(self._changed_fields)
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for field in self.fields:
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if (self.obj_attr_is_set(field) and
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isinstance(self[field], NovaObject) and
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self[field].obj_what_changed()):
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changes.add(field)
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return changes
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def obj_get_changes(self):
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"""Returns a dict of changed fields and their new values."""
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changes = {}
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for key in self.obj_what_changed():
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changes[key] = self[key]
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return changes
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def obj_reset_changes(self, fields=None):
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"""Reset the list of fields that have been changed.
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Note that this is NOT "revert to previous values"
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"""
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if fields:
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self._changed_fields -= set(fields)
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else:
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self._changed_fields.clear()
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def obj_attr_is_set(self, attrname):
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"""Test object to see if attrname is present.
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Returns True if the named attribute has a value set, or
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False if not. Raises AttributeError if attrname is not
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a valid attribute for this object.
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"""
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if attrname not in self.obj_fields:
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raise AttributeError(
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_("%(objname)s object has no attribute '%(attrname)s'") %
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{'objname': self.obj_name(), 'attrname': attrname})
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return hasattr(self, get_attrname(attrname))
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@property
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def obj_fields(self):
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return self.fields.keys() + self.obj_extra_fields
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# dictish syntactic sugar
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def iteritems(self):
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"""For backwards-compatibility with dict-based objects.
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NOTE(danms): May be removed in the future.
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"""
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for name in self.obj_fields:
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if (self.obj_attr_is_set(name) or
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name in self.obj_extra_fields):
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yield name, getattr(self, name)
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items = lambda self: list(self.iteritems())
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def __getitem__(self, name):
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"""For backwards-compatibility with dict-based objects.
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NOTE(danms): May be removed in the future.
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"""
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return getattr(self, name)
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def __setitem__(self, name, value):
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"""For backwards-compatibility with dict-based objects.
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NOTE(danms): May be removed in the future.
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"""
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setattr(self, name, value)
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def __contains__(self, name):
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"""For backwards-compatibility with dict-based objects.
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NOTE(danms): May be removed in the future.
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"""
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try:
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return self.obj_attr_is_set(name)
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except AttributeError:
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return False
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def get(self, key, value=NotSpecifiedSentinel):
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"""For backwards-compatibility with dict-based objects.
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NOTE(danms): May be removed in the future.
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"""
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if key not in self.obj_fields:
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raise AttributeError("'%s' object has no attribute '%s'" % (
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self.__class__, key))
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if value != NotSpecifiedSentinel and not self.obj_attr_is_set(key):
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return value
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else:
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return self[key]
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def update(self, updates):
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"""For backwards-compatibility with dict-base objects.
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NOTE(danms): May be removed in the future.
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"""
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for key, value in updates.items():
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self[key] = value
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class NovaPersistentObject(object):
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"""Mixin class for Persistent objects.
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This adds the fields that we use in common for all persisent objects.
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"""
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fields = {
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'created_at': fields.DateTimeField(nullable=True),
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'updated_at': fields.DateTimeField(nullable=True),
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'deleted_at': fields.DateTimeField(nullable=True),
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'deleted': fields.BooleanField(default=False),
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}
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class ObjectListBase(object):
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"""Mixin class for lists of objects.
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This mixin class can be added as a base class for an object that
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is implementing a list of objects. It adds a single field of 'objects',
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which is the list store, and behaves like a list itself. It supports
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serialization of the list of objects automatically.
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"""
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fields = {
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'objects': fields.ListOfObjectsField('NovaObject'),
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}
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# This is a dictionary of my_version:child_version mappings so that
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# we can support backleveling our contents based on the version
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# requested of the list object.
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child_versions = {}
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
super(ObjectListBase, self).__init__(*args, **kwargs)
|
|
if 'objects' not in kwargs:
|
|
self.objects = []
|
|
self._changed_fields.discard('objects')
|
|
|
|
def __iter__(self):
|
|
"""List iterator interface."""
|
|
return iter(self.objects)
|
|
|
|
def __len__(self):
|
|
"""List length."""
|
|
return len(self.objects)
|
|
|
|
def __getitem__(self, index):
|
|
"""List index access."""
|
|
if isinstance(index, slice):
|
|
new_obj = self.__class__()
|
|
new_obj.objects = self.objects[index]
|
|
# NOTE(danms): We must be mixed in with a NovaObject!
|
|
new_obj.obj_reset_changes()
|
|
new_obj._context = self._context
|
|
return new_obj
|
|
return self.objects[index]
|
|
|
|
def __contains__(self, value):
|
|
"""List membership test."""
|
|
return value in self.objects
|
|
|
|
def count(self, value):
|
|
"""List count of value occurrences."""
|
|
return self.objects.count(value)
|
|
|
|
def index(self, value):
|
|
"""List index of value."""
|
|
return self.objects.index(value)
|
|
|
|
def sort(self, cmp=None, key=None, reverse=False):
|
|
self.objects.sort(cmp=cmp, key=key, reverse=reverse)
|
|
|
|
def _attr_objects_to_primitive(self):
|
|
"""Serialization of object list."""
|
|
return [x.obj_to_primitive() for x in self.objects]
|
|
|
|
def _attr_objects_from_primitive(self, value):
|
|
"""Deserialization of object list."""
|
|
objects = []
|
|
for entity in value:
|
|
obj = NovaObject.obj_from_primitive(entity, context=self._context)
|
|
objects.append(obj)
|
|
return objects
|
|
|
|
def obj_make_compatible(self, primitive, target_version):
|
|
primitives = primitive['objects']
|
|
child_target_version = self.child_versions.get(target_version, '1.0')
|
|
for index, item in enumerate(self.objects):
|
|
self.objects[index].obj_make_compatible(
|
|
primitives[index]['nova_object.data'],
|
|
child_target_version)
|
|
primitives[index]['nova_object.version'] = child_target_version
|
|
|
|
def obj_what_changed(self):
|
|
changes = set(self._changed_fields)
|
|
for child in self.objects:
|
|
if child.obj_what_changed():
|
|
changes.add('objects')
|
|
return changes
|
|
|
|
|
|
class NovaObjectSerializer(messaging.NoOpSerializer):
|
|
"""A NovaObject-aware Serializer.
|
|
|
|
This implements the Oslo Serializer interface and provides the
|
|
ability to serialize and deserialize NovaObject entities. Any service
|
|
that needs to accept or return NovaObjects as arguments or result values
|
|
should pass this to its RPCClient and RPCServer objects.
|
|
"""
|
|
|
|
@property
|
|
def conductor(self):
|
|
if not hasattr(self, '_conductor'):
|
|
from nova import conductor
|
|
self._conductor = conductor.API()
|
|
return self._conductor
|
|
|
|
def _process_object(self, context, objprim):
|
|
try:
|
|
objinst = NovaObject.obj_from_primitive(objprim, context=context)
|
|
except exception.IncompatibleObjectVersion as e:
|
|
objinst = self.conductor.object_backport(context, objprim,
|
|
e.kwargs['supported'])
|
|
return objinst
|
|
|
|
def _process_iterable(self, context, action_fn, values):
|
|
"""Process an iterable, taking an action on each value.
|
|
:param:context: Request context
|
|
:param:action_fn: Action to take on each item in values
|
|
:param:values: Iterable container of things to take action on
|
|
:returns: A new container of the same type (except set) with
|
|
items from values having had action applied.
|
|
"""
|
|
iterable = values.__class__
|
|
if iterable == set:
|
|
# NOTE(danms): A set can't have an unhashable value inside, such as
|
|
# a dict. Convert sets to tuples, which is fine, since we can't
|
|
# send them over RPC anyway.
|
|
iterable = tuple
|
|
return iterable([action_fn(context, value) for value in values])
|
|
|
|
def serialize_entity(self, context, entity):
|
|
if isinstance(entity, (tuple, list, set)):
|
|
entity = self._process_iterable(context, self.serialize_entity,
|
|
entity)
|
|
elif (hasattr(entity, 'obj_to_primitive') and
|
|
callable(entity.obj_to_primitive)):
|
|
entity = entity.obj_to_primitive()
|
|
return entity
|
|
|
|
def deserialize_entity(self, context, entity):
|
|
if isinstance(entity, dict) and 'nova_object.name' in entity:
|
|
entity = self._process_object(context, entity)
|
|
elif isinstance(entity, (tuple, list, set)):
|
|
entity = self._process_iterable(context, self.deserialize_entity,
|
|
entity)
|
|
return entity
|
|
|
|
|
|
def obj_to_primitive(obj):
|
|
"""Recursively turn an object into a python primitive.
|
|
|
|
A NovaObject becomes a dict, and anything that implements ObjectListBase
|
|
becomes a list.
|
|
"""
|
|
if isinstance(obj, ObjectListBase):
|
|
return [obj_to_primitive(x) for x in obj]
|
|
elif isinstance(obj, NovaObject):
|
|
result = {}
|
|
for key, value in obj.iteritems():
|
|
result[key] = obj_to_primitive(value)
|
|
return result
|
|
elif isinstance(obj, netaddr.IPAddress):
|
|
return str(obj)
|
|
elif isinstance(obj, netaddr.IPNetwork):
|
|
return str(obj)
|
|
else:
|
|
return obj
|
|
|
|
|
|
def obj_make_list(context, list_obj, item_cls, db_list, **extra_args):
|
|
"""Construct an object list from a list of primitives.
|
|
|
|
This calls item_cls._from_db_object() on each item of db_list, and
|
|
adds the resulting object to list_obj.
|
|
|
|
:param:context: Request contextr
|
|
:param:list_obj: An ObjectListBase object
|
|
:param:item_cls: The NovaObject class of the objects within the list
|
|
:param:db_list: The list of primitives to convert to objects
|
|
:param:extra_args: Extra arguments to pass to _from_db_object()
|
|
:returns: list_obj
|
|
"""
|
|
list_obj.objects = []
|
|
for db_item in db_list:
|
|
item = item_cls._from_db_object(context, item_cls(), db_item,
|
|
**extra_args)
|
|
list_obj.objects.append(item)
|
|
list_obj._context = context
|
|
list_obj.obj_reset_changes()
|
|
return list_obj
|