code.grnet.gr Git - ganeti-local/blob - test/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()