def test_full(self):
# Test resource recovery after a premature termination
lock_dir = get_lock_dir('full')
resource = Resource('full', ['foo'], 1)
os.makedirs(lock_dir, exist_ok=True)
with open(os.path.join(lock_dir, '0.0.lock'), 'w') as fid:
fid.write(str(os.getpid()))
with self.assertRaises(ResourceError):
resource.acquire()
process = Process(target=lambda: 0)
process.start()
dead_pid = process.pid
process.join()
with open(os.path.join(lock_dir, '0.0.lock'), 'w') as fid:
fid.write(str(dead_pid))
lock = resource.acquire()
self.assertEqual(lock, 'foo')
# Test that additional calls to acquire after recovering resource, work
self.assertEqual(lock, resource.acquire())
# Clean up warnings
resource.release(force=True)
def test_dir_cleanup(self):
# Test that empty lock dir is auto deleted
resource = Resource('test', 1, 1)
if filelock.FileLock == filelock.SoftFileLock:
self.assertNotExist(resource.lock_dir)
else:
self.assertExist(resource.lock_dir, is_dir=True)
resource.acquire()
self.assertExist(resource.lock_dir, is_dir=True)
lock_file = resource._local.lock.lock_file
self.assertExist(lock_file)
resource.release()
self.assertNotExist(lock_file)
self.assertNotExist(resource.lock_dir)
def test_release(self):
# test releasing a lock in a single thread
test = Resource('test', 1, 1)
test.acquire()
lock = test._local.lock
self.assertIsNotNone(test._local.lock)
self.assertIsNotNone(test._local.resource_id)
self.assertIsNotNone(test._local.instance_id)
test.release()
# make sure file and cache is cleaned up
self.assertNotExist(lock.lock_file)
self.assertIsNone(test._local.lock)
self.assertIsNone(test._local.resource_id)
self.assertIsNone(test._local.instance_id)
def test_items(self):
# Test list of objects as resources
resource1 = Resource('items', ['foo', 'bar'])
resource2 = Resource('items', ['foo', 'bar'])
resource3 = Resource('items', ['foo', 'bar'])
foo = resource1.acquire()
self.assertEqual(foo, 'foo')
self.assertEqual(foo, resource1.acquire())
bar = resource2.acquire()
self.assertEqual(bar, 'bar')
self.assertEqual(bar, resource2.acquire())
with self.assertRaises(ResourceError):
resource3.acquire()
# Clean up warnings
resource1.release(force=True)
resource2.release(force=True)
def test_repeats(self):
# test repeated resources
repeat1 = Resource('repeat', 2, 2)
repeat2 = Resource('repeat', 2, 2)
repeat3 = Resource('repeat', 2, 2)
repeat4 = Resource('repeat', 2, 2)
repeat5 = Resource('repeat', 2, 2)
lock1 = repeat1.acquire()
lock2 = repeat2.acquire()
lock3 = repeat3.acquire()
lock4 = repeat4.acquire()
# Four unique names
self.assertEqual(
len({
repeat1._local.lock.lock_file, repeat2._local.lock.lock_file,
repeat3._local.lock.lock_file, repeat4._local.lock.lock_file
}), 4)
# reacquire, cache
lock1b = repeat1.acquire()
lock2b = repeat2.acquire()
lock3b = repeat3.acquire()
lock4b = repeat4.acquire()
self.assertEqual(lock1, lock1b)
self.assertEqual(lock2, lock2b)
self.assertEqual(lock3, lock3b)
self.assertEqual(lock4, lock4b)
with self.assertRaises(ResourceError):
repeat5.acquire()
self.assertEqual(lock1, 0)
self.assertEqual(repeat1._local.instance_id, 0)
self.assertEqual(lock2, 1)
self.assertEqual(repeat2._local.instance_id, 0)
self.assertEqual(lock3, 0)
self.assertEqual(repeat3._local.instance_id, 1)
self.assertEqual(lock4, 1)
self.assertEqual(repeat4._local.instance_id, 1)
# Clean up warnings
repeat1.release(force=True)
repeat2.release(force=True)
repeat3.release(force=True)
repeat4.release(force=True)
def test_acquire_single(self):
# test acquiring a lock in a single thread
test1 = Resource('single', 2, 1)
test2 = Resource('single', 2, 1)
test3 = Resource('single', 2, 1)
lock1 = test1.acquire()
lock2 = test1.acquire()
# Acquiring twice, should use the same value
self.assertEqual(lock1, lock2)
lock3 = test2.acquire()
# However, using an entirely different resource instance, won't have cache
self.assertNotEqual(lock1, lock3)
# At this point, I should be out of resources
with self.assertRaises(ResourceError):
test3.acquire()
# cleanup warnings
test1.release(force=True)
test2.release(force=True)
def test_none(self):
# Early version of the code used None in such a way it tripped up the logic
# This test is to make sure that doesn't happen again.
resource1 = Resource('none', [None, None, 1], 1)
resource2 = Resource('none', [None, None, 1], 1)
resource3 = Resource('none', [None, None], 1)
n1 = resource1.acquire()
self.assertIsNone(n1)
# Prevent the accidental delete lock loophole, which would create a race
# condition, if not caught
lock1 = resource1._local.lock
self.assertIsNone(resource1.acquire())
n2 = resource2.acquire()
self.assertIsNone(n2)
# resource2 should already be acquired, make sure it's not accidentally
# unlocking and relocking again
lock1.release()
self.assertIsNone(resource2.acquire())
lock1.acquire(timeout=0)
# two unique names
self.assertEqual(
len({
resource1._local.lock.lock_file,
resource2._local.lock.lock_file
}), 2)
with self.assertRaises(ResourceError):
resource3.acquire()
# Clean up warnings
resource1.release(force=True)
resource2.release(force=True)
def test_multiple_release(self):
test = Resource('test', 1, 1)
self.assertFalse(test.is_locked)
test.acquire()
self.assertTrue(test.is_locked)
self.assertEqual(test._local.lock._lock_counter, 1)
test.acquire()
self.assertTrue(test.is_locked)
self.assertEqual(test._local.lock._lock_counter, 2)
test.release()
self.assertTrue(test.is_locked)
self.assertEqual(test._local.lock._lock_counter, 1)
test.release()
self.assertFalse(test.is_locked)
with self.assertRaisesRegex(ValueError,
"Release called with no lock acquired"):
test.release()
def test_force_release(self):
test = Resource('test', 1, 1)
test.acquire()
test.acquire()
test.release(force=True)
self.assertFalse(test.is_locked)