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#!/usr/bin/env python
__metaclass__ = type
from optparse import OptionParser
import sys
import subprocess
from script_commands import (
Command,
UserError,
)
def tc(command):
subprocess.call('sudo tc ' + command, shell=True)
class StartCommand(Command):
@classmethod
def get_parser(cls):
parser = OptionParser()
parser.add_option(
'-d', '--delay', dest='delay', type='int',
help='Length of delay in miliseconds (each way).')
return parser
@staticmethod
def run(delay=500, port=443):
tc('qdisc add dev lo root handle 1: prio')
tc('qdisc add dev lo parent 1:3 handle 30: netem delay %dms' % delay)
tc('filter add dev lo protocol ip parent 1:0 prio 3 u32 match ip'
' dport %d 0xffff flowid 1:3' % port)
tc('filter add dev lo protocol ip parent 1:0 prio 3 u32 match ip'
' sport %d 0xffff flowid 1:3' % port)
Command.commands['start'] = StartCommand
class StopCommand(Command):
@staticmethod
def get_parser():
parser = OptionParser()
return parser
@staticmethod
def run():
tc('qdisc del dev lo root')
Command.commands['stop'] = StopCommand
if __name__ == "__main__":
try:
Command.run_subcommand(sys.argv[1:])
except UserError as e:
sys.stderr.write(str(e)+'\n')
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