code.grnet.gr Git - ganeti-local/blob - test/ganeti.utils.filelock_unittest.py

   1 #!/usr/bin/python
   2 #
   3
   4 # Copyright (C) 2006, 2007, 2010, 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.filelock"""
  23
  24 import os
  25 import tempfile
  26 import unittest
  27
  28 from ganeti import constants
  29 from ganeti import utils
  30 from ganeti import errors
  31
  32 import testutils
  33
  34
  35 class _BaseFileLockTest:
  36   """Test case for the FileLock class"""
  37
  38   def testSharedNonblocking(self):
  39     self.lock.Shared(blocking=False)
  40     self.lock.Close()
  41
  42   def testExclusiveNonblocking(self):
  43     self.lock.Exclusive(blocking=False)
  44     self.lock.Close()
  45
  46   def testUnlockNonblocking(self):
  47     self.lock.Unlock(blocking=False)
  48     self.lock.Close()
  49
  50   def testSharedBlocking(self):
  51     self.lock.Shared(blocking=True)
  52     self.lock.Close()
  53
  54   def testExclusiveBlocking(self):
  55     self.lock.Exclusive(blocking=True)
  56     self.lock.Close()
  57
  58   def testUnlockBlocking(self):
  59     self.lock.Unlock(blocking=True)
  60     self.lock.Close()
  61
  62   def testSharedExclusiveUnlock(self):
  63     self.lock.Shared(blocking=False)
  64     self.lock.Exclusive(blocking=False)
  65     self.lock.Unlock(blocking=False)
  66     self.lock.Close()
  67
  68   def testExclusiveSharedUnlock(self):
  69     self.lock.Exclusive(blocking=False)
  70     self.lock.Shared(blocking=False)
  71     self.lock.Unlock(blocking=False)
  72     self.lock.Close()
  73
  74   def testSimpleTimeout(self):
  75     # These will succeed on the first attempt, hence a short timeout
  76     self.lock.Shared(blocking=True, timeout=10.0)
  77     self.lock.Exclusive(blocking=False, timeout=10.0)
  78     self.lock.Unlock(blocking=True, timeout=10.0)
  79     self.lock.Close()
  80
  81   @staticmethod
  82   def _TryLockInner(filename, shared, blocking):
  83     lock = utils.FileLock.Open(filename)
  84
  85     if shared:
  86       fn = lock.Shared
  87     else:
  88       fn = lock.Exclusive
  89
  90     try:
  91       # The timeout doesn't really matter as the parent process waits for us to
  92       # finish anyway.
  93       fn(blocking=blocking, timeout=0.01)
  94     except errors.LockError, err:
  95       return False
  96
  97     return True
  98
  99   def _TryLock(self, *args):
 100     return utils.RunInSeparateProcess(self._TryLockInner, self.tmpfile.name,
 101                                       *args)
 102
 103   def testTimeout(self):
 104     for blocking in [True, False]:
 105       self.lock.Exclusive(blocking=True)
 106       self.failIf(self._TryLock(False, blocking))
 107       self.failIf(self._TryLock(True, blocking))
 108
 109       self.lock.Shared(blocking=True)
 110       self.assert_(self._TryLock(True, blocking))
 111       self.failIf(self._TryLock(False, blocking))
 112
 113   def testCloseShared(self):
 114     self.lock.Close()
 115     self.assertRaises(AssertionError, self.lock.Shared, blocking=False)
 116
 117   def testCloseExclusive(self):
 118     self.lock.Close()
 119     self.assertRaises(AssertionError, self.lock.Exclusive, blocking=False)
 120
 121   def testCloseUnlock(self):
 122     self.lock.Close()
 123     self.assertRaises(AssertionError, self.lock.Unlock, blocking=False)
 124
 125
 126 class TestFileLockWithFilename(testutils.GanetiTestCase, _BaseFileLockTest):
 127   TESTDATA = "Hello World\n" * 10
 128
 129   def setUp(self):
 130     testutils.GanetiTestCase.setUp(self)
 131
 132     self.tmpfile = tempfile.NamedTemporaryFile()
 133     utils.WriteFile(self.tmpfile.name, data=self.TESTDATA)
 134     self.lock = utils.FileLock.Open(self.tmpfile.name)
 135
 136     # Ensure "Open" didn't truncate file
 137     self.assertFileContent(self.tmpfile.name, self.TESTDATA)
 138
 139   def tearDown(self):
 140     self.assertFileContent(self.tmpfile.name, self.TESTDATA)
 141
 142     testutils.GanetiTestCase.tearDown(self)
 143
 144
 145 class TestFileLockWithFileObject(unittest.TestCase, _BaseFileLockTest):
 146   def setUp(self):
 147     self.tmpfile = tempfile.NamedTemporaryFile()
 148     self.lock = utils.FileLock(open(self.tmpfile.name, "w"), self.tmpfile.name)
 149
 150
 151 if __name__ == "__main__":
 152   testutils.GanetiTestProgram()