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#
# A library to manage ARCFIRE experiments
#
# Copyright (C) 2017 Nextworks S.r.l.
# Copyright (C) 2017 imec
#
# Sander Vrijders <sander.vrijders@ugent.be>
# Dimitri Staessens <dimitri.staessens@ugent.be>
# Vincenzo Maffione <v.maffione@nextworks.it>
# Marco Capitani <m.capitani@nextworks.it>
# Nick Aerts <nick.aerts@ugent.be>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., http://www.fsf.org/about/contact/.
#
import os
from time import sleep
import docker
import subprocess
import rumba.model as mod
import rumba.log as log
from rumba.executors.docker import DockerExecutor
logger = log.get_logger(__name__)
class Testbed(mod.Testbed):
def __init__(self, exp_name, base_image, pull_image=True,
use_ovs=False):
mod.Testbed.__init__(self, exp_name, "", "", "")
img = base_image.rsplit(":", 1)
self.base_image_repo = img[0]
self.base_image_tag = "latest" if len(img) == 1 else img[1]
self.base_image = "%s:%s" % (self.base_image_repo, self.base_image_tag)
self.pull_image = pull_image
self.use_ovs = use_ovs
self.running_containers = {}
self.active_bridges = set()
self.active_ipcps = set()
self.docker_client = docker.from_env()
self.executor = DockerExecutor(self)
def _swap_in(self, experiment):
docker_client = self.docker_client
# Pull image
if self.pull_image:
docker_client.images.pull(self.base_image_repo,
self.base_image_tag)
docker_client.images.get("%s:%s" % (self.base_image_repo,
self.base_image_tag))
# Start all nodes
for node in experiment.nodes:
self.running_containers[node.name] = docker_client.containers.run(
self.base_image, command=node.startup_command, name=node.name,
detach=True, network="none", privileged=True,
devices=["/dev/fuse"])
logger.info("Nodes starting")
if not os.path.exists("/var/run/netns"):
subprocess.check_call('sudo mkdir /var/run/netns'.split())
for shim in experiment.dif_ordering:
if not isinstance(shim, mod.ShimEthDIF):
# Nothing to do here
continue
cmd = ""
if self.use_ovs:
cmd += 'sudo ovs-vsctl add-br %(shim)s'
else:
cmd += 'sudo ip link add %(shim)s type bridge'
cmd = cmd % {'shim': shim.name}
self.active_bridges.add(shim.name)
subprocess.check_call(cmd.split())
if not self.use_ovs:
cmd = 'sudo ip link set dev %(shim)s up' % {'shim': shim.name}
subprocess.check_call(cmd.split())
for node in experiment.nodes:
container = self.running_containers[node.name]
container.reload()
state = container.attrs["State"]
while not state["Running"]:
sleep(0.2)
container.reload()
state = container.attrs["State"]
pid = state["Pid"]
subprocess.check_call(('sudo ln -s /proc/%(pid)i/ns/net '
'/var/run/netns/%(pid)i' % {'pid': pid}).split())
for ipcp in node.ipcps:
if isinstance(ipcp, mod.ShimEthIPCP):
if ipcp.ifname is None:
ipcp.ifname = "eth%i" % node.ipcps.index(ipcp)
cmd = ('sudo ip link add %(node)s.%(ifname)s type veth '
'peer name _%(node)s.%(ifname)s'\
% {'node': node.name, 'ifname': ipcp.ifname})
subprocess.check_call(cmd.split())
cmd = ""
if self.use_ovs:
cmd += ('sudo ovs-vsctl add-port %(dif)s %(node)s.%('
'ifname)s')
else:
cmd += ('sudo ip link set %(node)s.%(ifname)s master '
'%(dif)s')
cmd = (cmd % {'node': node.name,
'ifname': ipcp.ifname,
'dif': ipcp.dif.name})
subprocess.check_call(cmd.split())
cmd = ('sudo ip link set _%(node)s.%(ifname)s '
'netns %(pid)i '
'name %(ifname)s'
% {'node': node.name,
'pid': pid,
'ifname': ipcp.ifname})
subprocess.check_call(cmd.split())
cmd = ('sudo ip link set dev %(node)s.%(ifname)s up'
% {'node': node.name, 'ifname': ipcp.ifname})
subprocess.check_call(cmd.split())
cmd = ('sudo ip netns exec %(pid)i ip link set dev '
'%(ifname)s up'
% {'pid': pid, 'ifname': ipcp.ifname})
subprocess.check_call(cmd.split())
self.active_ipcps.add(ipcp)
logger.info("Experiment swapped in")
def swap_out(self, experiment):
for name, container in self.running_containers.items():
container.remove(force=True)
for shim in experiment.dif_ordering:
if isinstance(shim, mod.ShimEthDIF) and shim.name in self.active_bridges:
cmd = ""
if self.use_ovs:
cmd += 'sudo ovs-vsctl del-br %(shim)s'
else:
cmd += 'sudo ip link del %(shim)s'
cmd = cmd % {'shim': shim.name}
subprocess.check_call(cmd.split())
self.active_bridges.remove(shim.name)
for name, container in self.running_containers.items():
pid = container.attrs["State"]["Pid"]
cmd = 'sudo rm /var/run/netns/%(pid)i' % {'pid': pid}
subprocess.check_call(cmd.split())
self.running_containers = {}
logger.info("Experiment swapped out")
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