878 lines
34 KiB
Python
878 lines
34 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 contextlib
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import copy
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import datetime
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import functools
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import traceback
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import netaddr
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from oslo import messaging
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from oslo.utils import timeutils
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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.i18n import _, _LE
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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 import log as logging
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from nova.openstack.common import versionutils
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from nova import utils
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LOG = logging.getLogger('object')
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class NotSpecifiedSentinel(object):
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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 '_' + 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(_LE('Error setting %(attr)s'), {'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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# NOTE(ndipanov): Since NovaObjectSerializer will have
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# deserialized any object fields into objects already,
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# we do not try to deserialize them again here.
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if isinstance(value, NovaObject):
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self[key] = value
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else:
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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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#
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# This version is allowed to have three parts, X.Y.Z, where the .Z element
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# is reserved for stable branch backports. The .Z is ignored for the
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# purposes of triggering a backport, which means anything changed under
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# a .Z must be additive and non-destructive such that a node that knows
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# about X.Y can consider X.Y.Z equivalent.
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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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# Table of sub-object versioning information
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#
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# This contains a list of version mappings, by the field name of
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# the subobject. The mappings must be in order of oldest to
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# newest, and are tuples of (my_version, subobject_version). A
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# request to backport this object to $my_version will cause the
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# subobject to be backported to $subobject_version.
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#
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# obj_relationships = {
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# 'subobject1': [('1.2', '1.1'), ('1.4', '1.2')],
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# 'subobject2': [('1.2', '1.0')],
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# }
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#
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# In the above example:
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#
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# - If we are asked to backport our object to version 1.3,
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# subobject1 will be backported to version 1.1, since it was
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# bumped to version 1.2 when our version was 1.4.
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# - If we are asked to backport our object to version 1.5,
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# no changes will be made to subobject1 or subobject2, since
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# they have not changed since version 1.4.
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# - If we are asked to backlevel our object to version 1.1, we
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# will remove both subobject1 and subobject2 from the primitive,
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# since they were not added until version 1.2.
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obj_relationships = {}
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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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setattr(self, key, kwargs[key])
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def __repr__(self):
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return '%s(%s)' % (
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self.obj_name(),
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','.join(['%s=%s' % (name,
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(self.obj_attr_is_set(name) and
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field.stringify(getattr(self, name)) or
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'<?>'))
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for name, field in sorted(self.fields.items())]))
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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(_LE('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_obj_compatible(self, primitive, target_version, field):
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"""Backlevel a sub-object based on our versioning rules.
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This is responsible for backporting objects contained within
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this object's primitive according to a set of rules we
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maintain about version dependencies between objects. This
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requires that the obj_relationships table in this object is
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correct and up-to-date.
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:param:primitive: The primitive version of this object
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:param:target_version: The version string requested for this object
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:param:field: The name of the field in this object containing the
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sub-object to be backported
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"""
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def _do_backport(to_version):
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obj = getattr(self, field)
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if not obj:
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return
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if isinstance(obj, NovaObject):
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obj.obj_make_compatible(
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primitive[field]['nova_object.data'],
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to_version)
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primitive[field]['nova_object.version'] = to_version
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elif isinstance(obj, list):
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for i, element in enumerate(obj):
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element.obj_make_compatible(
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primitive[field][i]['nova_object.data'],
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to_version)
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primitive[field][i]['nova_object.version'] = to_version
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target_version = utils.convert_version_to_tuple(target_version)
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for index, versions in enumerate(self.obj_relationships[field]):
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my_version, child_version = versions
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my_version = utils.convert_version_to_tuple(my_version)
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if target_version < my_version:
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if index == 0:
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# We're backporting to a version from before this
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# subobject was added: delete it from the primitive.
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del primitive[field]
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else:
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# We're in the gap between index-1 and index, so
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# backport to the older version
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last_child_version = \
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self.obj_relationships[field][index - 1][1]
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_do_backport(last_child_version)
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return
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elif target_version == my_version:
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# This is the first mapping that satisfies the
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# target_version request: backport the object.
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_do_backport(child_version)
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return
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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. In
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general:
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- If a new version of an object adds a field, this routine
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should remove it for older versions.
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- If a new version changed or restricted the format of a field, this
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should convert it back to something a client knowing only of the
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older version will tolerate.
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- If an object that this object depends on is bumped, then this
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object should also take a version bump. Then, this routine should
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backlevel the dependent object (by calling its obj_make_compatible())
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if the requested version of this object is older than the version
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where the new dependent object was added.
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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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:raises: nova.exception.UnsupportedObjectError if conversion
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is not possible for some reason
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"""
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for key, field in self.fields.items():
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if not isinstance(field, (fields.ObjectField,
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fields.ListOfObjectsField)):
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continue
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if not self.obj_attr_is_set(key):
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continue
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if key not in self.obj_relationships:
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# NOTE(danms): This is really a coding error and shouldn't
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# happen unless we miss something
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raise exception.ObjectActionError(
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action='obj_make_compatible',
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reason='No rule for %s' % key)
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self._obj_make_obj_compatible(primitive, target_version, key)
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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_set_defaults(self, *attrs):
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if not attrs:
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attrs = [name for name, field in self.fields.items()
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if field.default != fields.UnspecifiedDefault]
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for attr in attrs:
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default = self.fields[attr].default
|
|
if default is fields.UnspecifiedDefault:
|
|
raise exception.ObjectActionError(
|
|
action='set_defaults',
|
|
reason='No default set for field %s' % attr)
|
|
setattr(self, attr, default)
|
|
|
|
def obj_load_attr(self, attrname):
|
|
"""Load an additional attribute from the real object.
|
|
|
|
This should use self._conductor, and cache any data that might
|
|
be useful for future load operations.
|
|
"""
|
|
raise NotImplementedError(
|
|
_("Cannot load '%s' in the base class") % attrname)
|
|
|
|
def save(self, context):
|
|
"""Save the changed fields back to the store.
|
|
|
|
This is optional for subclasses, but is presented here in the base
|
|
class for consistency among those that do.
|
|
"""
|
|
raise NotImplementedError('Cannot save anything in the base class')
|
|
|
|
def obj_what_changed(self):
|
|
"""Returns a set of fields that have been modified."""
|
|
changes = set(self._changed_fields)
|
|
for field in self.fields:
|
|
if (self.obj_attr_is_set(field) and
|
|
isinstance(getattr(self, field), NovaObject) and
|
|
getattr(self, field).obj_what_changed()):
|
|
changes.add(field)
|
|
return changes
|
|
|
|
def obj_get_changes(self):
|
|
"""Returns a dict of changed fields and their new values."""
|
|
changes = {}
|
|
for key in self.obj_what_changed():
|
|
changes[key] = getattr(self, key)
|
|
return changes
|
|
|
|
def obj_reset_changes(self, fields=None):
|
|
"""Reset the list of fields that have been changed.
|
|
|
|
Note that this is NOT "revert to previous values"
|
|
"""
|
|
if fields:
|
|
self._changed_fields -= set(fields)
|
|
else:
|
|
self._changed_fields.clear()
|
|
|
|
def obj_attr_is_set(self, attrname):
|
|
"""Test object to see if attrname is present.
|
|
|
|
Returns True if the named attribute has a value set, or
|
|
False if not. Raises AttributeError if attrname is not
|
|
a valid attribute for this object.
|
|
"""
|
|
if attrname not in self.obj_fields:
|
|
raise AttributeError(
|
|
_("%(objname)s object has no attribute '%(attrname)s'") %
|
|
{'objname': self.obj_name(), 'attrname': attrname})
|
|
return hasattr(self, get_attrname(attrname))
|
|
|
|
@property
|
|
def obj_fields(self):
|
|
return self.fields.keys() + self.obj_extra_fields
|
|
|
|
|
|
class NovaObjectDictCompat(object):
|
|
"""Mix-in to provide dictionary key access compat
|
|
|
|
If an object needs to support attribute access using
|
|
dictionary items instead of object attributes, inherit
|
|
from this class. This should only be used as a temporary
|
|
measure until all callers are converted to use modern
|
|
attribute access.
|
|
|
|
NOTE(berrange) This class will eventually be deleted.
|
|
"""
|
|
|
|
# dictish syntactic sugar
|
|
def iteritems(self):
|
|
"""For backwards-compatibility with dict-based objects.
|
|
|
|
NOTE(danms): May be removed in the future.
|
|
"""
|
|
for name in self.obj_fields:
|
|
if (self.obj_attr_is_set(name) or
|
|
name in self.obj_extra_fields):
|
|
yield name, getattr(self, name)
|
|
|
|
items = lambda self: list(self.iteritems())
|
|
|
|
def __getitem__(self, name):
|
|
"""For backwards-compatibility with dict-based objects.
|
|
|
|
NOTE(danms): May be removed in the future.
|
|
"""
|
|
return getattr(self, name)
|
|
|
|
def __setitem__(self, name, value):
|
|
"""For backwards-compatibility with dict-based objects.
|
|
|
|
NOTE(danms): May be removed in the future.
|
|
"""
|
|
setattr(self, name, value)
|
|
|
|
def __contains__(self, name):
|
|
"""For backwards-compatibility with dict-based objects.
|
|
|
|
NOTE(danms): May be removed in the future.
|
|
"""
|
|
try:
|
|
return self.obj_attr_is_set(name)
|
|
except AttributeError:
|
|
return False
|
|
|
|
def get(self, key, value=NotSpecifiedSentinel):
|
|
"""For backwards-compatibility with dict-based objects.
|
|
|
|
NOTE(danms): May be removed in the future.
|
|
"""
|
|
if key not in self.obj_fields:
|
|
raise AttributeError("'%s' object has no attribute '%s'" % (
|
|
self.__class__, key))
|
|
if value != NotSpecifiedSentinel and not self.obj_attr_is_set(key):
|
|
return value
|
|
else:
|
|
return getattr(self, key)
|
|
|
|
def update(self, updates):
|
|
"""For backwards-compatibility with dict-base objects.
|
|
|
|
NOTE(danms): May be removed in the future.
|
|
"""
|
|
for key, value in updates.items():
|
|
setattr(self, key, value)
|
|
|
|
|
|
class NovaPersistentObject(object):
|
|
"""Mixin class for Persistent objects.
|
|
This adds the fields that we use in common for all persistent objects.
|
|
"""
|
|
fields = {
|
|
'created_at': fields.DateTimeField(nullable=True),
|
|
'updated_at': fields.DateTimeField(nullable=True),
|
|
'deleted_at': fields.DateTimeField(nullable=True),
|
|
'deleted': fields.BooleanField(default=False),
|
|
}
|
|
|
|
@contextlib.contextmanager
|
|
def obj_as_admin(self):
|
|
"""Context manager to make an object call as an admin.
|
|
|
|
This temporarily modifies the context embedded in an object to
|
|
be elevated() and restores it after the call completes. Example
|
|
usage:
|
|
|
|
with obj.obj_as_admin():
|
|
obj.save()
|
|
|
|
"""
|
|
if self._context is None:
|
|
raise exception.OrphanedObjectError(method='obj_as_admin',
|
|
objtype=self.obj_name())
|
|
|
|
original_context = self._context
|
|
self._context = self._context.elevated()
|
|
try:
|
|
yield
|
|
finally:
|
|
self._context = original_context
|
|
|
|
|
|
class ObjectListBase(object):
|
|
"""Mixin class for lists of objects.
|
|
|
|
This mixin class can be added as a base class for an object that
|
|
is implementing a list of objects. It adds a single field of 'objects',
|
|
which is the list store, and behaves like a list itself. It supports
|
|
serialization of the list of objects automatically.
|
|
"""
|
|
fields = {
|
|
'objects': fields.ListOfObjectsField('NovaObject'),
|
|
}
|
|
|
|
# This is a dictionary of my_version:child_version mappings so that
|
|
# we can support backleveling our contents based on the version
|
|
# requested of the list object.
|
|
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 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:
|
|
objver = objprim['nova_object.version']
|
|
if objver.count('.') == 2:
|
|
# NOTE(danms): For our purposes, the .z part of the version
|
|
# should be safe to accept without requiring a backport
|
|
objprim['nova_object.version'] = \
|
|
'.'.join(objver.split('.')[:2])
|
|
return self._process_object(context, objprim)
|
|
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 issubclass(iterable, dict):
|
|
return iterable(**{k: action_fn(context, v)
|
|
for k, v in six.iteritems(values)})
|
|
else:
|
|
# 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.
|
|
if iterable == set:
|
|
iterable = tuple
|
|
return iterable([action_fn(context, value) for value in values])
|
|
|
|
def serialize_entity(self, context, entity):
|
|
if isinstance(entity, (tuple, list, set, dict)):
|
|
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, dict)):
|
|
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 in obj.obj_fields:
|
|
if obj.obj_attr_is_set(key) or key in obj.obj_extra_fields:
|
|
result[key] = obj_to_primitive(getattr(obj, key))
|
|
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 context
|
|
: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
|
|
|
|
|
|
def serialize_args(fn):
|
|
"""Decorator that will do the arguments serialization before remoting."""
|
|
def wrapper(obj, *args, **kwargs):
|
|
for kw in kwargs:
|
|
value_arg = kwargs.get(kw)
|
|
if kw == 'exc_val' and value_arg:
|
|
kwargs[kw] = str(value_arg)
|
|
elif kw == 'exc_tb' and (
|
|
not isinstance(value_arg, six.string_types) and value_arg):
|
|
kwargs[kw] = ''.join(traceback.format_tb(value_arg))
|
|
elif isinstance(value_arg, datetime.datetime):
|
|
kwargs[kw] = timeutils.isotime(value_arg)
|
|
if hasattr(fn, '__call__'):
|
|
return fn(obj, *args, **kwargs)
|
|
# NOTE(danms): We wrap a descriptor, so use that protocol
|
|
return fn.__get__(None, obj)(*args, **kwargs)
|
|
|
|
# NOTE(danms): Make this discoverable
|
|
wrapper.remotable = getattr(fn, 'remotable', False)
|
|
wrapper.original_fn = fn
|
|
return (functools.wraps(fn)(wrapper) if hasattr(fn, '__call__')
|
|
else classmethod(wrapper))
|