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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import abc
import copy
import logging
import operator
import types
from netmodel.model.attribute import Attribute as BaseAttribute, NEVER_SET
from netmodel.model.attribute import Multiplicity, DEFAULT
from netmodel.model.type import Self
from netmodel.model.uuid import UUID
from netmodel.util.misc import is_iterable
from vicn.core.requirement import Requirement, RequirementList
from vicn.core.state import Operations
log = logging.getLogger(__name__)
#------------------------------------------------------------------------------
# Attribute
#------------------------------------------------------------------------------
class Attribute(BaseAttribute):
properties = BaseAttribute.properties
properties.extend([
'requirements',
'remote_default'
])
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Post processing attribute properties
if self.requirements is not NEVER_SET:
self.requirements = RequirementList(self.requirements)
#--------------------------------------------------------------------------
# Descriptor protocol
#
# see. https://docs.python.org/3/howto/descriptor.html
#--------------------------------------------------------------------------
# XXX Overloaded & simpler
def __get__(self, instance, owner=None):
if not instance:
return self
return instance.get(self.name, blocking=False)
def __set__(self, instance, value):
if not instance:
raise NotImplementedError('Setting default value not implemented')
instance.set(self.name, value, blocking=False)
#--------------------------------------------------------------------------
def do_list_add(self, instance, value):
if instance.is_local_attribute(self.name):
from vicn.core.resource import Resource
if isinstance(value, Resource):
value = value.get_uuid()
return value
else:
try:
cur_value = vars(instance)[self.name]
if self.is_collection:
# copy the list
cur_value = list(cur_value)
except KeyError as e:
cur_value = None
if self.is_collection:
cur_value = list()
instance._state.dirty[self.name].trigger(Operations.LIST_ADD,
value, cur_value)
# prevent instrumented list to perform operation
raise InstrumentedListException
def do_list_remove(self, instance, value):
if instance.is_local_attribute(self.name):
from vicn.core.resource import Resource
if isinstance(value, Resource):
value = value.get_uuid()
return value
else:
cur_value = vars(instance)[self.name]
if self.is_collection:
# copy the list
cur_value = list(cur_value)
instance._state.dirty[self.name].trigger(Operations.LIST_REMOVE,
value, cur_value)
# prevent instrumented list to perform operation
raise InstrumentedListException
def do_list_clear(self, instance):
if instance.is_local_attribute(self.name):
return
else:
cur_value = vars(instance)[self.name]
if self.is_collection:
# copy the list
cur_value = list(cur_value)
instance._state.dirty[self.name].trigger(Operations.LIST_CLEAR,
value, cur_value)
# prevent instrumented list to perform operation
raise InstrumentedListException
def handle_getitem(self, instance, item):
if isinstance(item, UUID):
from vicn.core.resource_mgr import ResourceManager
return ResourceManager().by_uuid(item)
return item
#--------------------------------------------------------------------------
# Operations
#--------------------------------------------------------------------------
def merge(self, parent):
for prop in Attribute.properties:
# NOTE: we cannot use getattr otherwise we get the default value,
# and we never override
value = vars(self).get(prop, NEVER_SET)
if value is not NEVER_SET and not is_iterable(value):
continue
parent_value = vars(parent).get(prop, NEVER_SET)
if parent_value is NEVER_SET:
continue
if parent_value:
if is_iterable(value):
value.extend(parent_value)
else:
setattr(self, prop, parent_value)
#------------------------------------------------------------------------------
# XXX Move this to object, be careful of access to self._reference !
class Reference:
"""
Value reference.
Attribute value refers to attribute value on a different resource.
Use resource = Self to point to another attribute of the same resource.
"""
def __init__(self, resource, attribute=None):
self._resource = resource
self._attribute = attribute
def get_proxy(self):
if self._resource is Self:
resource = getattr(self, self._attribute)
else:
resource = getattr(self._resource, self._attribute)
return resource
def get(self, attribute_name):
return self.get_proxy().get(attribute_name)
def __iter__(self):
return iter(self.get_proxy())
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