def test_preserve_error_subprocess():
pipe_recv, pipe_send = multiprocessing.Pipe(False)
def child(c, pipe):
try:
c.preserve('preserved')
except Exception as e:
pipe.send(pickle.dumps(e))
finally:
pipe.close()
with tempfile.TemporaryDirectory() as d:
cache = MultiprocessFileCache(10, dir=d, do_pickle=True)
for i in range(10):
cache.put(i, str(i))
# Run preservation in the subprocess
p = multiprocessing.Process(target=child, args=(cache, pipe_send))
p.start()
p.join()
cache.close()
e = pickle.loads(pipe_recv.recv())
assert isinstance(e, RuntimeError)
def test_cleanup():
with tempfile.TemporaryDirectory() as d:
cache = MultiprocessFileCache(10, dir=d, do_pickle=True)
for i in range(10):
cache.put(i, str(i))
assert len(os.listdir(d)) == 1
cache.close()
assert len(os.listdir(d)) == 0
def test_preservation_error_already_exists():
with tempfile.TemporaryDirectory() as d:
cache = MultiprocessFileCache(10, dir=d, do_pickle=True)
for i in range(10):
cache.put(i, str(i))
cache.preserve('preserved')
with pytest.raises(ValueError):
cache.preserve('preserved')
cache.close()
def test_preservation_interoperability():
with tempfile.TemporaryDirectory() as d:
cache = MultiprocessFileCache(10, dir=d, do_pickle=True)
for i in range(10):
cache.put(i, str(i))
assert cache.preserve('preserved') is True
cache.close()
cache2 = FileCache(10, dir=d, do_pickle=True)
assert cache2.preload('preserved') is True
for i in range(10):
assert str(i) == cache2.get(i)
cache2.close()
def test_preservation():
with tempfile.TemporaryDirectory() as d:
cache = MultiprocessFileCache(10, dir=d, do_pickle=True)
for i in range(10):
cache.put(i, str(i))
cache.preserve('preserved')
cache.close()
# Imitating a new process, fresh load
cache2 = MultiprocessFileCache(10, dir=d, do_pickle=True)
cache2.preload('preserved')
for i in range(10):
assert str(i) == cache2.get(i)
cache2.close()
# No temporary cache file should remain,
# and the preserved cache should be kept.
assert os.listdir(d) == ['preserved.cached', 'preserved.cachei']