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100 lines
3.4 KiB
100 lines
3.4 KiB
#!/usr/bin/env python
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#
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# Copyright 2020 - The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Tests for LocalInstanceLock."""
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import fcntl
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import os
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import shutil
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import tempfile
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import unittest
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from unittest import mock
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from acloud import errors
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from acloud.internal.lib import local_instance_lock
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class LocalInstanceLockTest(unittest.TestCase):
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"""Test LocalInstanceLock methods."""
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def setUp(self):
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self._temp_dir = tempfile.mkdtemp()
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self._lock_path = os.path.join(self._temp_dir, "temp.lock")
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self._lock = local_instance_lock.LocalInstanceLock(
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self._lock_path)
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def tearDown(self):
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shutil.rmtree(self._temp_dir, ignore_errors=True)
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def testLock(self):
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"""Test the method calls that don't raise errors."""
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self.assertTrue(self._lock.LockIfNotInUse())
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self.assertTrue(os.path.isfile(self._lock_path))
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self._lock.Unlock()
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self.assertTrue(self._lock.LockIfNotInUse(timeout_secs=0))
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self._lock.SetInUse(True)
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self._lock.Unlock()
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self.assertFalse(self._lock.LockIfNotInUse())
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self.assertTrue(self._lock.Lock())
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self._lock.SetInUse(False)
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self._lock.Unlock()
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self.assertTrue(self._lock.Lock(timeout_secs=0))
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self._lock.Unlock()
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def testOperationsWithoutLock(self):
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"""Test raising errors when the file is not locked."""
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self.assertRaises(RuntimeError, self._lock.Unlock)
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self.assertRaises(RuntimeError, self._lock.SetInUse, True)
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self.assertRaises(RuntimeError, self._lock.SetInUse, False)
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def testNonBlockingLock(self):
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"""Test failing to lock in non-blocking mode."""
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lock = local_instance_lock.LocalInstanceLock(self._lock_path)
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self.assertTrue(lock.Lock(timeout_secs=0))
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try:
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self.assertFalse(self._lock.Lock(timeout_secs=0))
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self.assertFalse(self._lock.LockIfNotInUse(timeout_secs=0))
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finally:
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lock.Unlock()
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@mock.patch("acloud.internal.lib.local_instance_lock."
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"utils.TimeoutException")
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def testLockWithTimeout(self, mock_timeout_exception):
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"""Test failing to lock due to timeout."""
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mock_wrapped_flock = mock.Mock(side_effect=errors.FunctionTimeoutError)
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mock_wrapper = mock.Mock(return_value=mock_wrapped_flock)
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mock_timeout_exception.return_value = mock_wrapper
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self.assertFalse(self._lock.Lock(timeout_secs=1))
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mock_wrapper.assert_called_once_with(fcntl.flock)
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mock_wrapped_flock.assert_called_once_with(mock.ANY, fcntl.LOCK_EX)
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mock_wrapper.reset_mock()
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mock_wrapped_flock.reset_mock()
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self.assertFalse(self._lock.LockIfNotInUse(timeout_secs=1))
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mock_wrapper.assert_called_once_with(fcntl.flock)
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mock_wrapped_flock.assert_called_once_with(mock.ANY, fcntl.LOCK_EX)
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if __name__ == "__main__":
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unittest.main()
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