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  • Committer: Aaron Bentley
  • Date: 2011-08-05 15:47:22 UTC
  • mto: This revision was merged to the branch mainline in revision 13619.
  • Revision ID: aaron@canonical.com-20110805154722-aas1d2wrk9vlfrqh
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utilities/local-latency
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def tc(command):
 
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    """Run a tc command under sudo.
 
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    :param tc: The remainder of the command (leaving out tc).
 
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    """
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     subprocess.call('sudo tc ' + command, shell=True)
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@helps(delay='Length of delay in miliseconds (each way).',
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       port='Port to induce delay on.')
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def start(delay=500, port=443):
 
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    """Add artificial latency to the lo interface on the specified port."""
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    tc('qdisc add dev lo root handle 1: prio')
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    tc('qdisc add dev lo parent 1:3 handle 30: netem delay %dms' % delay)
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    tc('filter add dev lo protocol ip parent 1:0 prio 3 u32 match ip'
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def stop():
 
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    """Add latency from the lo."""
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    tc('qdisc del dev lo root')
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