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