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import os
import signal
from string import Template
import subprocess
import time
from TdcPlugin import TdcPlugin
from tdc_config import *
class SubPlugin(TdcPlugin):
def __init__(self):
self.sub_class = 'ns/SubPlugin'
super().__init__()
def pre_suite(self, testcount, testidlist):
'''run commands before test_runner goes into a test loop'''
super().pre_suite(testcount, testidlist)
if self.args.namespace:
self._ns_create()
else:
self._ports_create()
def post_suite(self, index):
'''run commands after test_runner goes into a test loop'''
super().post_suite(index)
if self.args.verbose:
print('{}.post_suite'.format(self.sub_class))
if self.args.namespace:
self._ns_destroy()
else:
self._ports_destroy()
def add_args(self, parser):
super().add_args(parser)
self.argparser_group = self.argparser.add_argument_group(
'netns',
'options for nsPlugin(run commands in net namespace)')
self.argparser_group.add_argument(
'-N', '--no-namespace', action='store_false', default=True,
dest='namespace', help='Don\'t run commands in namespace')
return self.argparser
def adjust_command(self, stage, command):
super().adjust_command(stage, command)
cmdform = 'list'
cmdlist = list()
if not self.args.namespace:
return command
if self.args.verbose:
print('{}.adjust_command'.format(self.sub_class))
if not isinstance(command, list):
cmdform = 'str'
cmdlist = command.split()
else:
cmdlist = command
if stage == 'setup' or stage == 'execute' or stage == 'verify' or stage == 'teardown':
if self.args.verbose:
print('adjust_command: stage is {}; inserting netns stuff in command [{}] list [{}]'.format(stage, command, cmdlist))
cmdlist.insert(0, self.args.NAMES['NS'])
cmdlist.insert(0, 'exec')
cmdlist.insert(0, 'netns')
cmdlist.insert(0, self.args.NAMES['IP'])
else:
pass
if cmdform == 'str':
command = ' '.join(cmdlist)
else:
command = cmdlist
if self.args.verbose:
print('adjust_command: return command [{}]'.format(command))
return command
def _ports_create(self):
cmd = '$IP link add $DEV0 type veth peer name $DEV1'
self._exec_cmd('pre', cmd)
cmd = '$IP link set $DEV0 up'
self._exec_cmd('pre', cmd)
if not self.args.namespace:
cmd = '$IP link set $DEV1 up'
self._exec_cmd('pre', cmd)
def _ports_destroy(self):
cmd = '$IP link del $DEV0'
self._exec_cmd('post', cmd)
def _ns_create(self):
'''
Create the network namespace in which the tests will be run and set up
the required network devices for it.
'''
self._ports_create()
if self.args.namespace:
cmd = '$IP netns add {}'.format(self.args.NAMES['NS'])
self._exec_cmd('pre', cmd)
cmd = '$IP link set $DEV1 netns {}'.format(self.args.NAMES['NS'])
self._exec_cmd('pre', cmd)
cmd = '$IP -n {} link set $DEV1 up'.format(self.args.NAMES['NS'])
self._exec_cmd('pre', cmd)
if self.args.device:
cmd = '$IP link set $DEV2 netns {}'.format(self.args.NAMES['NS'])
self._exec_cmd('pre', cmd)
cmd = '$IP -n {} link set $DEV2 up'.format(self.args.NAMES['NS'])
self._exec_cmd('pre', cmd)
def _ns_destroy(self):
'''
Destroy the network namespace for testing (and any associated network
devices as well)
'''
if self.args.namespace:
cmd = '$IP netns delete {}'.format(self.args.NAMES['NS'])
self._exec_cmd('post', cmd)
def _exec_cmd(self, stage, command):
'''
Perform any required modifications on an executable command, then run
it in a subprocess and return the results.
'''
if '$' in command:
command = self._replace_keywords(command)
self.adjust_command(stage, command)
if self.args.verbose:
print('_exec_cmd: command "{}"'.format(command))
proc = subprocess.Popen(command,
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
env=ENVIR)
(rawout, serr) = proc.communicate()
if proc.returncode != 0 and len(serr) > 0:
foutput = serr.decode("utf-8")
else:
foutput = rawout.decode("utf-8")
proc.stdout.close()
proc.stderr.close()
return proc, foutput
def _replace_keywords(self, cmd):
"""
For a given executable command, substitute any known
variables contained within NAMES with the correct values
"""
tcmd = Template(cmd)
subcmd = tcmd.safe_substitute(self.args.NAMES)
return subcmd
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