42e43b4cc8536d5051c08a556a4609912a19afd4
[ganeti-github.git] / test / py / ganeti.utils.retry_unittest.py
1 #!/usr/bin/python
2 #
3
4 # Copyright (C) 2011 Google Inc.
5 #
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
10 #
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
15 #
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 # 02110-1301, USA.
20
21
22 """Script for testing ganeti.utils.retry"""
23
24 import unittest
25
26 from ganeti import constants
27 from ganeti import errors
28 from ganeti import utils
29
30 import testutils
31
32
33 class TestRetry(testutils.GanetiTestCase):
34 def setUp(self):
35 testutils.GanetiTestCase.setUp(self)
36 self.retries = 0
37 self.called = 0
38
39 @staticmethod
40 def _RaiseRetryAgain():
41 raise utils.RetryAgain()
42
43 @staticmethod
44 def _RaiseRetryAgainWithArg(args):
45 raise utils.RetryAgain(*args)
46
47 def _WrongNestedLoop(self):
48 return utils.Retry(self._RaiseRetryAgain, 0.01, 0.02)
49
50 def _RetryAndSucceed(self, retries):
51 if self.retries < retries:
52 self.retries += 1
53 raise utils.RetryAgain()
54 else:
55 return True
56
57 def _SimpleRetryAndSucceed(self, retries):
58 self.called += 1
59 if self.retries < retries:
60 self.retries += 1
61 return False
62 else:
63 return True
64
65 def testRaiseTimeout(self):
66 self.failUnlessRaises(utils.RetryTimeout, utils.Retry,
67 self._RaiseRetryAgain, 0.01, 0.02)
68 self.failUnlessRaises(utils.RetryTimeout, utils.Retry,
69 self._RetryAndSucceed, 0.01, 0, args=[1])
70 self.failUnlessEqual(self.retries, 1)
71
72 def testComplete(self):
73 self.failUnlessEqual(utils.Retry(lambda: True, 0, 1), True)
74 self.failUnlessEqual(utils.Retry(self._RetryAndSucceed, 0, 1, args=[2]),
75 True)
76 self.failUnlessEqual(self.retries, 2)
77
78 def testNestedLoop(self):
79 try:
80 self.failUnlessRaises(errors.ProgrammerError, utils.Retry,
81 self._WrongNestedLoop, 0, 1)
82 except utils.RetryTimeout:
83 self.fail("Didn't detect inner loop's exception")
84
85 def testTimeoutArgument(self):
86 retry_arg="my_important_debugging_message"
87 try:
88 utils.Retry(self._RaiseRetryAgainWithArg, 0.01, 0.02, args=[[retry_arg]])
89 except utils.RetryTimeout, err:
90 self.failUnlessEqual(err.args, (retry_arg, ))
91 else:
92 self.fail("Expected timeout didn't happen")
93
94 def testRaiseInnerWithExc(self):
95 retry_arg="my_important_debugging_message"
96 try:
97 try:
98 utils.Retry(self._RaiseRetryAgainWithArg, 0.01, 0.02,
99 args=[[errors.GenericError(retry_arg, retry_arg)]])
100 except utils.RetryTimeout, err:
101 err.RaiseInner()
102 else:
103 self.fail("Expected timeout didn't happen")
104 except errors.GenericError, err:
105 self.failUnlessEqual(err.args, (retry_arg, retry_arg))
106 else:
107 self.fail("Expected GenericError didn't happen")
108
109 def testRaiseInnerWithMsg(self):
110 retry_arg="my_important_debugging_message"
111 try:
112 try:
113 utils.Retry(self._RaiseRetryAgainWithArg, 0.01, 0.02,
114 args=[[retry_arg, retry_arg]])
115 except utils.RetryTimeout, err:
116 err.RaiseInner()
117 else:
118 self.fail("Expected timeout didn't happen")
119 except utils.RetryTimeout, err:
120 self.failUnlessEqual(err.args, (retry_arg, retry_arg))
121 else:
122 self.fail("Expected RetryTimeout didn't happen")
123
124 def testSimpleRetry(self):
125 self.assertFalse(utils.SimpleRetry(True, lambda: False, 0.01, 0.02))
126 self.assertFalse(utils.SimpleRetry(lambda x: x, lambda: False, 0.01, 0.02))
127 self.assertTrue(utils.SimpleRetry(True, lambda: True, 0, 1))
128 self.assertTrue(utils.SimpleRetry(lambda x: x, lambda: True, 0, 1))
129 self.assertTrue(utils.SimpleRetry(True, self._SimpleRetryAndSucceed,
130 0, 1, args=[1]))
131 self.assertEqual(self.retries, 1)
132 self.assertEqual(self.called, 2)
133 self.called = self.retries = 0
134 self.assertTrue(utils.SimpleRetry(True, self._SimpleRetryAndSucceed,
135 0, 1, args=[2]))
136 self.assertEqual(self.called, 3)
137
138
139 if __name__ == "__main__":
140 testutils.GanetiTestProgram()