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