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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 random
import string
import logging
import asyncio
from netmodel.model.type import Integer, String
from netmodel.model.key import Key
from vicn.core.attribute import Attribute, Reference
from vicn.core.exception import ResourceNotFound
from vicn.core.state import ResourceState, AttributeState
from vicn.core.task import inline_task, async_task, run_task
from vicn.core.task import get_attributes_task, BashTask
from vicn.core.task import inherit_parent
from vicn.resource.channel import Channel
from vicn.resource.interface import Interface
from vicn.resource.linux.net_device import NonTapBaseNetDevice
from vicn.resource.node import Node
from vicn.resource.lxd.lxc_container import CMD_MOUNT_FOLDER, LxcContainer
from vicn.resource.vpp.memif_device import MemifDevice
from vicn.resource.linux.folder import Folder
# FIXME remove VPP specific code
from vicn.resource.vpp.interface import VPPInterface
log = logging.getLogger(__name__)
CONTAINER_SOCKET_PATH='/root/{}'
SHARED_FOLDER_PATH='/tmp/{}'
class MemifLink(Channel):
"""
Resource: MemifLink
Implements a virtual wired link between containers. It is made
with a pair of MemifDevice which are created in the two containers.
Because of this, the resource only supports passing source and destination
containers, and not interfaces. It also explains the relative complexity of
the current implementation.
"""
src_node = Attribute(LxcContainer, description = 'Source node',
mandatory = True)
dst_node = Attribute(LxcContainer, description = 'Destination node',
mandatory = True)
folder = Attribute(Folder, description = 'Shared folder holding the socket used by the MemifDevices')
key = Attribute(Integer)
__key__ = Key(src_node, dst_node)
def __init__(self, *args, **kwargs):
assert 'src_node' in kwargs and 'dst_node' in kwargs
self._src = None
self._dst = None
self._folder = None
super().__init__(*args, **kwargs)
@inherit_parent
def __subresources__(self):
assert self.src_node.node_with_kernel == self.dst_node.node_with_kernel
host = self.src_node.node_with_kernel
# We create two managed net devices that are pre-setup
# but the resource manager has to take over for IP addresses etc.
# Being done in initialize, those attributes won't be considered as
# dependencies and will thus not block the resource state machine.
socket_name = 'socket-' + ''.join(random.choice(string.ascii_uppercase
+ string.digits) for _ in range(5)) +'.file'
_folder = Folder(node = host,
foldername = SHARED_FOLDER_PATH.format(self.src_node.name + '-' + self.dst_node.name),
permission = 777)
self.key = random.randint(0, 2**31)
self._src = MemifDevice(node = self.src_node,
channel = self,
owner = self,
path_unix_socket = CONTAINER_SOCKET_PATH.format(self.src_node.name + '-'
+ self.dst_node.name) + '/',
folder_host = _folder,
socket_name = socket_name,
device_name = 'memif-'+self.dst_node.name,
key = Reference(self, 'key'),
master = False)
self._dst = MemifDevice(node = self.dst_node,
channel = self,
owner = self,
path_unix_socket = CONTAINER_SOCKET_PATH.format(self.src_node.name + '-'
+ self.dst_node.name) + '/',
socket_name = socket_name,
folder_host = _folder,
device_name = 'memif-'+self.src_node.name,
key = Reference(self, 'key'),
master = True)
self._dst.remote = self._src
self._src.remote = self._dst
return _folder | (self._src | self._dst)
#--------------------------------------------------------------------------
# Internal methods
#--------------------------------------------------------------------------
async def _commit(self):
manager = self._state.manager
if hasattr(self.src_node, 'vpp') and not self.src_node.vpp is None:
vpp_src = VPPInterface(parent = self._src,
vpp = self.src_node.vpp,
ip4_address = Reference(self._src, 'ip4_address'),
ip6_address = Reference(self._src, 'ip6_address'))
manager.commit_resource(vpp_src)
if hasattr(self.dst_node, 'vpp') and not self.dst_node.vpp is None:
vpp_dst = VPPInterface(parent = self._dst,
vpp = self.dst_node.vpp,
ip4_address = Reference(self._dst, 'ip4_address'),
ip6_address = Reference(self._dst, 'ip6_address'))
manager.commit_resource(vpp_dst)
@inherit_parent
def __get__(self):
return async_task(self._commit)()
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