1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
#!/usr/bin/env python
# Copyright 2012 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Unit tests for proxyshaper.
Usage:
$ ./proxyshaper_test.py
"""
import proxyshaper
import StringIO
import unittest
# pylint: disable=bad-whitespace
VALID_RATES = (
# input, expected_bps
( '384Kbit/s', 384000),
('1536Kbit/s', 1536000),
( '1Mbit/s', 1000000),
( '5Mbit/s', 5000000),
( '2MByte/s', 16000000),
( '0', 0),
( '5', 5),
( 384000, 384000),
)
ERROR_RATES = (
'1536KBit/s', # Older versions of dummynet used capital 'B' for bytes.
'1Mbyte/s', # Require capital 'B' for bytes.
'5bps',
)
class TimedTestCase(unittest.TestCase):
def assertValuesAlmostEqual(self, expected, actual, tolerance=0.05):
"""Like the following with nicer default message:
assertTrue(expected <= actual + tolerance &&
expected >= actual - tolerance)
"""
delta = tolerance * expected
if actual > expected + delta or actual < expected - delta:
self.fail('%s is not equal to expected %s +/- %s%%' % (
actual, expected, 100 * tolerance))
class RateLimitedFileTest(TimedTestCase):
def testReadLimitedBasic(self):
num_bytes = 1024
bps = 384000
request_counter = lambda: 1
f = StringIO.StringIO(' ' * num_bytes)
limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
start = proxyshaper.TIMER()
self.assertEqual(num_bytes, len(limited_f.read()))
expected_ms = 8.0 * num_bytes / bps * 1000.0
actual_ms = (proxyshaper.TIMER() - start) * 1000.0
self.assertValuesAlmostEqual(expected_ms, actual_ms)
def testReadlineLimitedBasic(self):
num_bytes = 1024 * 8 + 512
bps = 384000
request_counter = lambda: 1
f = StringIO.StringIO(' ' * num_bytes)
limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
start = proxyshaper.TIMER()
self.assertEqual(num_bytes, len(limited_f.readline()))
expected_ms = 8.0 * num_bytes / bps * 1000.0
actual_ms = (proxyshaper.TIMER() - start) * 1000.0
self.assertValuesAlmostEqual(expected_ms, actual_ms)
def testReadLimitedSlowedByMultipleRequests(self):
num_bytes = 1024
bps = 384000
request_count = 2
request_counter = lambda: request_count
f = StringIO.StringIO(' ' * num_bytes)
limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
start = proxyshaper.TIMER()
num_read_bytes = limited_f.read()
self.assertEqual(num_bytes, len(num_read_bytes))
expected_ms = 8.0 * num_bytes / (bps / float(request_count)) * 1000.0
actual_ms = (proxyshaper.TIMER() - start) * 1000.0
self.assertValuesAlmostEqual(expected_ms, actual_ms)
def testWriteLimitedBasic(self):
num_bytes = 1024 * 10 + 350
bps = 384000
request_counter = lambda: 1
f = StringIO.StringIO()
limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
start = proxyshaper.TIMER()
limited_f.write(' ' * num_bytes)
self.assertEqual(num_bytes, len(limited_f.getvalue()))
expected_ms = 8.0 * num_bytes / bps * 1000.0
actual_ms = (proxyshaper.TIMER() - start) * 1000.0
self.assertValuesAlmostEqual(expected_ms, actual_ms)
def testWriteLimitedSlowedByMultipleRequests(self):
num_bytes = 1024 * 10
bps = 384000
request_count = 2
request_counter = lambda: request_count
f = StringIO.StringIO(' ' * num_bytes)
limited_f = proxyshaper.RateLimitedFile(request_counter, f, bps)
start = proxyshaper.TIMER()
limited_f.write(' ' * num_bytes)
self.assertEqual(num_bytes, len(limited_f.getvalue()))
expected_ms = 8.0 * num_bytes / (bps / float(request_count)) * 1000.0
actual_ms = (proxyshaper.TIMER() - start) * 1000.0
self.assertValuesAlmostEqual(expected_ms, actual_ms)
class GetBitsPerSecondTest(unittest.TestCase):
def testConvertsValidValues(self):
for dummynet_option, expected_bps in VALID_RATES:
bps = proxyshaper.GetBitsPerSecond(dummynet_option)
self.assertEqual(
expected_bps, bps, 'Unexpected result for %s: %s != %s' % (
dummynet_option, expected_bps, bps))
def testRaisesOnUnexpectedValues(self):
for dummynet_option in ERROR_RATES:
self.assertRaises(proxyshaper.BandwidthValueError,
proxyshaper.GetBitsPerSecond, dummynet_option)
if __name__ == '__main__':
unittest.main()
|
