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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 math
from vicn.core.resource import Resource
from netmodel.model.type import String
from vicn.core.attribute import Attribute
from vicn.resource.ip.prefix_tree import Inet6Prefix, PrefixTree, Inet4Prefix
from vicn.core.task import inline_task
from vicn.core.exception import ResourceNotFound
class IpAssignment(Resource):
prefix = Attribute(String, mandatory=True)
control_prefix = Attribute(String, description="prefix for control plane")
PrefixClass = None
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self._prefix = self.PrefixClass(self.prefix)
self._prefix_tree = PrefixTree(self._prefix)
self._assigned_prefixes = {}
if self.control_prefix:
self._ctrl_prefix = self.PrefixClass(self.control_prefix)
self._ctrl_prefix_it = iter(self._ctrl_prefix)
next(self._ctrl_prefix_it) #Removes internet address
self._assigned_addresses = {}
def get_prefix(self, obj, prefix_size):
ret = None
if obj in self._assigned_prefixes:
ret = self._assigned_prefixes[obj]
else:
ret = self._prefix_tree.get_prefix(prefix_size)
self._assigned_prefixes[obj] = ret
return ret
def get_control_address(self, obj):
ret = None
if not self.control_prefix:
raise RuntimeError("No control prefix given")
try:
ret = self._assigned_addresses[obj]
except KeyError:
ret = next(self._ctrl_prefix_it)
self._assigned_addresses[obj] = ret
return ret
@inline_task
def __get__(self):
raise ResourceNotFound
@inline_task
def __create__(self):
# XXX code from Channel.__create__, until Events are properly implemented.
# Iterate on channels for allocate IP addresses
for group in self.groups:
for channel in group.iter_by_type_str('channel'):
interfaces = sorted(channel.interfaces, key = lambda x : x.device_name)
if not interfaces:
continue
min_prefix_size = math.ceil(math.log(len(channel.interfaces), 2))
prefix_size = min(self.DEFAULT_PREFIX_SIZE, self.MAX_PREFIX_SIZE - min_prefix_size)
prefix = iter(self.get_prefix(channel, prefix_size))
for interface in interfaces:
ip = next(prefix)
print('attribute ip=', ip)
setattr(interface, self.ATTR_ADDRESS, ip)
setattr(interface, self.ATTR_PREFIX, prefix_size)
__delete__ = None
class Ipv6Assignment(IpAssignment):
PrefixClass = Inet6Prefix
DEFAULT_PREFIX_SIZE = 64
MAX_PREFIX_SIZE = 128
ATTR_ADDRESS = 'ip6_address'
ATTR_PREFIX = 'ip6_prefix'
class Ipv4Assignment(IpAssignment):
PrefixClass = Inet4Prefix
DEFAULT_PREFIX_SIZE = 32
MAX_PREFIX_SIZE = 32
ATTR_ADDRESS = 'ip4_address'
ATTR_PREFIX = 'ip4_prefix'
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