diff options
Diffstat (limited to 'vicn/resource/linux/sym_veth_pair.py')
| -rw-r--r-- | vicn/resource/linux/sym_veth_pair.py | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/vicn/resource/linux/sym_veth_pair.py b/vicn/resource/linux/sym_veth_pair.py new file mode 100644 index 00000000..bf79a69b --- /dev/null +++ b/vicn/resource/linux/sym_veth_pair.py @@ -0,0 +1,151 @@ +#!/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 random +import string + +from netmodel.model.type import Integer +from vicn.core.attribute import Attribute +from vicn.core.exception import ResourceNotFound +from vicn.core.resource import Resource +from vicn.core.state import ResourceState, AttributeState +from vicn.core.task import BashTask, get_attributes_task +from vicn.core.task import async_task, task, inline_task +from vicn.core.task import run_task +from vicn.resource.interface import Interface +from vicn.resource.node import Node +from vicn.resource.linux.net_device import NonTapBaseNetDevice +from vicn.resource.linux.link import CMD_DELETE_IF_EXISTS +from vicn.resource.linux.link import CMD_UP + +CMD_CREATE=''' +# Create veth pair in the host node +ip link add name {tmp_side1} type veth peer name {tmp_side2} +ip link set dev {tmp_side1} netns {pid[0]} name {side1_device_name} +ip link set dev {tmp_side2} netns {pid[1]} name {side2_device_name} +''' + +class SymVethPair(Resource): + """ + Resource: SymVethPair + + This resource is used in VPPBridge. The main difference with the Link + resource is that is it not a channel. + """ + + node1 = Attribute(Node, + description = 'Node on which one side of the veth will sit', + mandatory = True) + node2 = Attribute(Node, + description = 'Node on which the other side of the veth will sit', + mandatory = True) + capacity = Attribute(Integer, + description = 'Capacity of the veth pair (Mb/s)') + side1 = Attribute(Interface, description = 'Source interface') + side2 = Attribute(Interface, description = 'Destination interface') + + #-------------------------------------------------------------------------- + # Internal methods + #-------------------------------------------------------------------------- + + async def _commit(self): + # see link.py for explanations + manager = self._state.manager + await manager._set_resource_state(self.side1, + ResourceState.INITIALIZED) + await manager._set_resource_state(self.side2, + ResourceState.INITIALIZED) + await manager._set_resource_state(self.side1, ResourceState.CREATED) + await manager._set_resource_state(self.side2, ResourceState.CREATED) + await manager._set_attribute_state(self, 'side1', AttributeState.CLEAN) + await manager._set_attribute_state(self, 'side2', AttributeState.CLEAN) + manager.commit_resource(self.side1) + manager.commit_resource(self.side2) + + #-------------------------------------------------------------------------- + # Resource lifecycle + #-------------------------------------------------------------------------- + + @inline_task + def __initialize__(self): + self.side1 = NonTapBaseNetDevice(node = self.node1, + device_name = self.node2.name, + capacity = self.capacity, + owner = self.owner) + self.side2 = NonTapBaseNetDevice(node = self.node2, + device_name = self.node1.name, + capacity = self.capacity, + owner = self.owner) + self.side1.remote = self.side2 + self.side2.remote = self.side1 + + @async_task + async def __get__(self): + manager = self._state.manager + + try: + await run_task(self.side1.__get__(), manager) + await run_task(self.side2.__get__(), manager) + except ResourceNotFound: + raise ResourceNotFound + + await self._commit() + + def __create__(self): + assert self.node1.get_type() == 'lxccontainer' + assert self.node2.get_type() == 'lxccontainer' + + node1_host = self.node1.node + node2_host = self.node2.node + + assert node1_host == node2_host + host = node1_host + + # Sometimes a down interface persists on one side + delif_side1 = BashTask(self.node1, CMD_DELETE_IF_EXISTS, + {'interface': self.side1}) + delif_side2 = BashTask(self.node2, CMD_DELETE_IF_EXISTS, + {'interface': self.side2}) + + pid_node1 = get_attributes_task(self.node1, ['pid']) + pid_node2 = get_attributes_task(self.node2, ['pid']) + + tmp_side1 = 'tmp-veth-' + ''.join(random.choice( + string.ascii_uppercase + string.digits) for _ in range(5)) + tmp_side2 = 'tmp-veth-' + ''.join(random.choice( + string.ascii_uppercase + string.digits) for _ in range(5)) + + create = BashTask(host, CMD_CREATE, + {'side1_device_name': self.side1.device_name, + 'side2_device_name': self.side2.device_name, + 'tmp_side1': tmp_side1, 'tmp_side2': tmp_side2}) + + up_side1 = BashTask(self.node1, CMD_UP, {'interface': self.side1}) + up_side2 = BashTask(self.node2, CMD_UP, {'interface': self.side2}) + + @async_task + async def set_state(): + await self._commit() + + delif = delif_side1 | delif_side2 + up = up_side1 | up_side2 + pid = pid_node1 | pid_node2 + return ((delif > (pid @ create)) > up) > set_state() + + def __delete__(self): + raise NotImplementedError |