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Fixed #20536 -- rewrite of the file based cache backend

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* Safer for use in multiprocess environments
 * Better random culling
 * Cache files use less disk space
 * Safer delete behavior

Also fixed #15806, fixed #15825.
This commit is contained in:
Jaap Roes 2013-08-26 16:34:02 +02:00 • committed by Anssi Kääriäinen
parent ac2d86f8d3
commit 7be638390e
3 changed files with 143 additions and 145 deletions
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48
tests/cache/tests.py vendored
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@ -1076,33 +1076,35 @@ class FileBasedCacheTests(unittest.TestCase, BaseCacheTests):
def tearDown(self):
self.cache.clear()
def test_hashing(self):
"""Test that keys are hashed into subdirectories correctly"""
self.cache.set("foo", "bar")
key = self.cache.make_key("foo")
keyhash = hashlib.md5(key.encode()).hexdigest()
keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
self.assertTrue(os.path.exists(keypath))
def test_subdirectory_removal(self):
"""
Make sure that the created subdirectories are correctly removed when empty.
"""
self.cache.set("foo", "bar")
key = self.cache.make_key("foo")
keyhash = hashlib.md5(key.encode()).hexdigest()
keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
self.assertTrue(os.path.exists(keypath))
self.cache.delete("foo")
self.assertTrue(not os.path.exists(keypath))
self.assertTrue(not os.path.exists(os.path.dirname(keypath)))
self.assertTrue(not os.path.exists(os.path.dirname(os.path.dirname(keypath))))
os.rmdir(self.dirname)
def test_cull(self):
self.perform_cull_test(50, 29)
def test_ignores_non_cache_files(self):
fname = os.path.join(self.dirname, 'not-a-cache-file')
with open(fname, 'w'):
os.utime(fname, None)
self.cache.clear()
self.assertTrue(os.path.exists(fname),
'Expected cache.clear to ignore non cache files')
os.remove(fname)
def test_clear_does_not_remove_cache_dir(self):
self.cache.clear()
self.assertTrue(os.path.exists(self.dirname),
'Expected cache.clear to keep the cache dir')
def test_creates_cache_dir_if_nonexistent(self):
os.rmdir(self.dirname)
self.cache.set('foo', 'bar')
os.path.exists(self.dirname)
def test_zero_cull(self):
# Regression test for #15806
self.cache = get_cache(self.backend_name, LOCATION=self.dirname, OPTIONS={'MAX_ENTRIES': 30, 'CULL_FREQUENCY': 0})
self.perform_cull_test(50, 19)
class CustomCacheKeyValidationTests(unittest.TestCase):
"""