root / test / py / ganeti.utils.filelock_unittest.py @ 07809f7d
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#!/usr/bin/python
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#
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# Copyright (C) 2006, 2007, 2010, 2011 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Script for testing ganeti.utils.filelock"""
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import os |
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import tempfile |
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import unittest |
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from ganeti import constants |
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from ganeti import utils |
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from ganeti import errors |
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import testutils |
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class _BaseFileLockTest: |
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"""Test case for the FileLock class"""
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def testSharedNonblocking(self): |
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self.lock.Shared(blocking=False) |
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self.lock.Close()
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def testExclusiveNonblocking(self): |
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self.lock.Exclusive(blocking=False) |
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self.lock.Close()
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def testUnlockNonblocking(self): |
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self.lock.Unlock(blocking=False) |
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self.lock.Close()
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def testSharedBlocking(self): |
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self.lock.Shared(blocking=True) |
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self.lock.Close()
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def testExclusiveBlocking(self): |
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self.lock.Exclusive(blocking=True) |
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self.lock.Close()
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def testUnlockBlocking(self): |
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self.lock.Unlock(blocking=True) |
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self.lock.Close()
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def testSharedExclusiveUnlock(self): |
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self.lock.Shared(blocking=False) |
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self.lock.Exclusive(blocking=False) |
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self.lock.Unlock(blocking=False) |
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self.lock.Close()
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def testExclusiveSharedUnlock(self): |
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self.lock.Exclusive(blocking=False) |
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self.lock.Shared(blocking=False) |
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self.lock.Unlock(blocking=False) |
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self.lock.Close()
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def testSimpleTimeout(self): |
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# These will succeed on the first attempt, hence a short timeout
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self.lock.Shared(blocking=True, timeout=10.0) |
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self.lock.Exclusive(blocking=False, timeout=10.0) |
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self.lock.Unlock(blocking=True, timeout=10.0) |
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self.lock.Close()
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@staticmethod
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def _TryLockInner(filename, shared, blocking): |
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lock = utils.FileLock.Open(filename) |
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if shared:
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fn = lock.Shared |
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else:
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fn = lock.Exclusive |
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try:
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# The timeout doesn't really matter as the parent process waits for us to
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# finish anyway.
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fn(blocking=blocking, timeout=0.01)
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except errors.LockError, err:
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return False |
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return True |
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def _TryLock(self, *args): |
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return utils.RunInSeparateProcess(self._TryLockInner, self.tmpfile.name, |
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*args) |
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def testTimeout(self): |
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for blocking in [True, False]: |
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self.lock.Exclusive(blocking=True) |
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self.failIf(self._TryLock(False, blocking)) |
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self.failIf(self._TryLock(True, blocking)) |
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self.lock.Shared(blocking=True) |
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self.assert_(self._TryLock(True, blocking)) |
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self.failIf(self._TryLock(False, blocking)) |
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def testCloseShared(self): |
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self.lock.Close()
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self.assertRaises(AssertionError, self.lock.Shared, blocking=False) |
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def testCloseExclusive(self): |
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self.lock.Close()
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self.assertRaises(AssertionError, self.lock.Exclusive, blocking=False) |
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def testCloseUnlock(self): |
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self.lock.Close()
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self.assertRaises(AssertionError, self.lock.Unlock, blocking=False) |
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class TestFileLockWithFilename(testutils.GanetiTestCase, _BaseFileLockTest): |
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TESTDATA = "Hello World\n" * 10 |
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def setUp(self): |
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testutils.GanetiTestCase.setUp(self)
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self.tmpfile = tempfile.NamedTemporaryFile()
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utils.WriteFile(self.tmpfile.name, data=self.TESTDATA) |
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self.lock = utils.FileLock.Open(self.tmpfile.name) |
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# Ensure "Open" didn't truncate file
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self.assertFileContent(self.tmpfile.name, self.TESTDATA) |
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def tearDown(self): |
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self.assertFileContent(self.tmpfile.name, self.TESTDATA) |
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testutils.GanetiTestCase.tearDown(self)
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class TestFileLockWithFileObject(unittest.TestCase, _BaseFileLockTest): |
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def setUp(self): |
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self.tmpfile = tempfile.NamedTemporaryFile()
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self.lock = utils.FileLock(open(self.tmpfile.name, "w"), self.tmpfile.name) |
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if __name__ == "__main__": |
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testutils.GanetiTestProgram() |