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#!/usr/bin/env python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""End-to-end tests for traffic control library."""
import os
import re
import sys
import unittest
import traffic_control
class TrafficControlTests(unittest.TestCase):
"""System tests for traffic_control functions.
These tests require root access.
"""
# A dummy interface name to use instead of real interface.
_INTERFACE = 'myeth'
def setUp(self):
"""Setup a dummy interface."""
# If we update to python version 2.7 or newer we can use setUpClass() or
# unittest.skipIf().
if os.getuid() != 0:
sys.exit('You need root access to run these tests.')
command = ['ip', 'link', 'add', 'name', self._INTERFACE, 'type', 'dummy']
traffic_control._Exec(command, 'Error creating dummy interface %s.' %
self._INTERFACE)
def tearDown(self):
"""Teardown the dummy interface and any network constraints on it."""
# Deleting the dummy interface deletes all associated constraints.
command = ['ip', 'link', 'del', self._INTERFACE]
traffic_control._Exec(command)
def testExecOutput(self):
output = traffic_control._Exec(['echo', ' Test '])
self.assertEqual(output, 'Test')
def testExecException(self):
self.assertRaises(traffic_control.TrafficControlError,
traffic_control._Exec, command=['ls', '!doesntExist!'])
def testExecErrorCustomMsg(self):
try:
traffic_control._Exec(['ls', '!doesntExist!'], msg='test_msg')
self.fail('No exception raised for invalid command.')
except traffic_control.TrafficControlError as e:
self.assertEqual(e.msg, 'test_msg')
def testAddRootQdisc(self):
"""Checks adding a root qdisc is successful."""
config = {'interface': self._INTERFACE}
root_detail = 'qdisc htb 1: root'
# Assert no htb root at startup.
command = ['tc', 'qdisc', 'ls', 'dev', config['interface']]
output = traffic_control._Exec(command)
self.assertFalse(root_detail in output)
traffic_control._AddRootQdisc(config['interface'])
output = traffic_control._Exec(command)
# Assert htb root is added.
self.assertTrue(root_detail in output)
def testConfigureClassAdd(self):
"""Checks adding and deleting a class to the root qdisc."""
config = {
'interface': self._INTERFACE,
'port': 12345,
'server_port': 33333,
'bandwidth': 2000
}
class_detail = ('class htb 1:%x root prio 0 rate %dKbit ceil %dKbit' %
(config['port'], config['bandwidth'], config['bandwidth']))
# Add root qdisc.
traffic_control._AddRootQdisc(config['interface'])
# Assert class does not exist prior to adding it.
command = ['tc', 'class', 'ls', 'dev', config['interface']]
output = traffic_control._Exec(command)
self.assertFalse(class_detail in output)
# Add class to root.
traffic_control._ConfigureClass('add', config)
# Assert class is added.
command = ['tc', 'class', 'ls', 'dev', config['interface']]
output = traffic_control._Exec(command)
self.assertTrue(class_detail in output)
# Delete class.
traffic_control._ConfigureClass('del', config)
# Assert class is deleted.
command = ['tc', 'class', 'ls', 'dev', config['interface']]
output = traffic_control._Exec(command)
self.assertFalse(class_detail in output)
def testAddSubQdisc(self):
"""Checks adding a sub qdisc to existing class."""
config = {
'interface': self._INTERFACE,
'port': 12345,
'server_port': 33333,
'bandwidth': 2000,
'latency': 250,
'loss': 5
}
qdisc_re_detail = ('qdisc netem %x: parent 1:%x .* delay %d.0ms loss %d%%' %
(config['port'], config['port'], config['latency'],
config['loss']))
# Add root qdisc.
traffic_control._AddRootQdisc(config['interface'])
# Add class to root.
traffic_control._ConfigureClass('add', config)
# Assert qdisc does not exist prior to adding it.
command = ['tc', 'qdisc', 'ls', 'dev', config['interface']]
output = traffic_control._Exec(command)
handle_id_re = re.search(qdisc_re_detail, output)
self.assertEqual(handle_id_re, None)
# Add qdisc to class.
traffic_control._AddSubQdisc(config)
# Assert qdisc is added.
command = ['tc', 'qdisc', 'ls', 'dev', config['interface']]
output = traffic_control._Exec(command)
handle_id_re = re.search(qdisc_re_detail, output)
self.assertNotEqual(handle_id_re, None)
def testAddDeleteFilter(self):
config = {
'interface': self._INTERFACE,
'port': 12345,
'bandwidth': 2000
}
# Assert no filter exists.
command = ['tc', 'filter', 'list', 'dev', config['interface'], 'parent',
'1:0']
output = traffic_control._Exec(command)
self.assertEqual(output, '')
# Create the root and class to which the filter will be attached.
# Add root qdisc.
traffic_control._AddRootQdisc(config['interface'])
# Add class to root.
traffic_control._ConfigureClass('add', config)
# Add the filter.
traffic_control._AddFilter(config['interface'], config['port'])
handle_id = traffic_control._GetFilterHandleId(config['interface'],
config['port'])
self.assertNotEqual(handle_id, None)
# Delete the filter.
# The output of tc filter list is not None because tc adds default filters.
traffic_control._DeleteFilter(config['interface'], config['port'])
self.assertRaises(traffic_control.TrafficControlError,
traffic_control._GetFilterHandleId, config['interface'],
config['port'])
if __name__ == '__main__':
unittest.main()
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