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# This file is part of Supysonic.
# Supysonic is a Python implementation of the Subsonic server API.
#
# Copyright (C) 2018 Alban 'spl0k' Féron
# 2018-2019 Carey 'pR0Ps' Metcalfe
#
# Distributed under terms of the GNU AGPLv3 license.
import os
import unittest
import shutil
import time
import tempfile
from supysonic.cache import Cache, CacheMiss, ProtectedError
class CacheTestCase(unittest.TestCase):
def setUp(self):
self.__dir = tempfile.mkdtemp()
def tearDown(self):
shutil.rmtree(self.__dir)
def test_existing_files_order(self):
cache = Cache(self.__dir, 30)
val = b"0123456789"
cache.set("key1", val)
cache.set("key2", val)
cache.set("key3", val)
self.assertEqual(cache.size, 30)
# file mtime is accurate to the second
time.sleep(1)
cache.get_value("key1")
cache = Cache(self.__dir, 30, min_time=0)
self.assertEqual(cache.size, 30)
self.assertTrue(cache.has("key1"))
self.assertTrue(cache.has("key2"))
self.assertTrue(cache.has("key3"))
cache.set("key4", val)
self.assertEqual(cache.size, 30)
self.assertTrue(cache.has("key1"))
self.assertFalse(cache.has("key2"))
self.assertTrue(cache.has("key3"))
self.assertTrue(cache.has("key4"))
def test_missing(self):
cache = Cache(self.__dir, 10)
self.assertFalse(cache.has("missing"))
with self.assertRaises(CacheMiss):
cache.get_value("missing")
def test_delete_missing(self):
cache = Cache(self.__dir, 0, min_time=0)
cache.delete("missing1")
cache.delete("missing2")
def test_store_literal(self):
cache = Cache(self.__dir, 10)
val = b"0123456789"
cache.set("key", val)
self.assertEqual(cache.size, 10)
self.assertTrue(cache.has("key"))
self.assertEqual(cache.get_value("key"), val)
def test_store_generated(self):
cache = Cache(self.__dir, 10)
val = [b"0", b"12", b"345", b"6789"]
def gen():
yield from val
t = []
for x in cache.set_generated("key", gen):
t.append(x)
self.assertEqual(cache.size, 0)
self.assertFalse(cache.has("key"))
self.assertEqual(t, val)
self.assertEqual(cache.size, 10)
self.assertEqual(cache.get_value("key"), b"".join(val))
def test_store_to_fp(self):
cache = Cache(self.__dir, 10)
val = b"0123456789"
with cache.set_fileobj("key") as fp:
fp.write(val)
self.assertEqual(cache.size, 0)
self.assertEqual(cache.size, 10)
self.assertEqual(cache.get_value("key"), val)
def test_access_data(self):
cache = Cache(self.__dir, 25, min_time=0)
val = b"0123456789"
cache.set("key", val)
self.assertEqual(cache.get_value("key"), val)
with cache.get_fileobj("key") as f:
self.assertEqual(f.read(), val)
with open(cache.get("key"), "rb") as f:
self.assertEqual(f.read(), val)
def test_accessing_preserves(self):
cache = Cache(self.__dir, 25, min_time=0)
val = b"0123456789"
cache.set("key1", val)
cache.set("key2", val)
self.assertEqual(cache.size, 20)
cache.get_value("key1")
cache.set("key3", val)
self.assertEqual(cache.size, 20)
self.assertTrue(cache.has("key1"))
self.assertFalse(cache.has("key2"))
self.assertTrue(cache.has("key3"))
def test_automatic_delete_oldest(self):
cache = Cache(self.__dir, 25, min_time=0)
val = b"0123456789"
cache.set("key1", val)
self.assertTrue(cache.has("key1"))
self.assertEqual(cache.size, 10)
cache.set("key2", val)
self.assertEqual(cache.size, 20)
self.assertTrue(cache.has("key1"))
self.assertTrue(cache.has("key2"))
cache.set("key3", val)
self.assertEqual(cache.size, 20)
self.assertFalse(cache.has("key1"))
self.assertTrue(cache.has("key2"))
self.assertTrue(cache.has("key3"))
def test_delete(self):
cache = Cache(self.__dir, 25, min_time=0)
val = b"0123456789"
cache.set("key1", val)
self.assertTrue(cache.has("key1"))
self.assertEqual(cache.size, 10)
cache.delete("key1")
self.assertFalse(cache.has("key1"))
self.assertEqual(cache.size, 0)
def test_cleanup_on_error(self):
cache = Cache(self.__dir, 10)
def gen():
# Cause a TypeError halfway through
yield from [b"0", b"12", object(), b"345", b"6789"]
with self.assertRaises(TypeError):
for x in cache.set_generated("key", gen):
pass
# Make sure no partial files are left after the error
self.assertEqual(list(os.listdir(self.__dir)), list())
def test_parallel_generation(self):
cache = Cache(self.__dir, 20)
def gen():
yield from [b"0", b"12", b"345", b"6789"]
g1 = cache.set_generated("key", gen)
g2 = cache.set_generated("key", gen)
next(g1)
files = os.listdir(self.__dir)
self.assertEqual(len(files), 1)
for x in files:
self.assertTrue(x.endswith(".part"))
next(g2)
files = os.listdir(self.__dir)
self.assertEqual(len(files), 2)
for x in files:
self.assertTrue(x.endswith(".part"))
self.assertEqual(cache.size, 0)
for x in g1:
pass
self.assertEqual(cache.size, 10)
self.assertTrue(cache.has("key"))
# Replace the file - size should stay the same
for x in g2:
pass
self.assertEqual(cache.size, 10)
self.assertTrue(cache.has("key"))
# Only a single file
self.assertEqual(len(os.listdir(self.__dir)), 1)
def test_replace(self):
cache = Cache(self.__dir, 20)
val_small = b"0"
val_big = b"0123456789"
cache.set("key", val_small)
self.assertEqual(cache.size, 1)
cache.set("key", val_big)
self.assertEqual(cache.size, 10)
cache.set("key", val_small)
self.assertEqual(cache.size, 1)
def test_no_auto_prune(self):
cache = Cache(self.__dir, 10, min_time=0, auto_prune=False)
val = b"0123456789"
cache.set("key1", val)
cache.set("key2", val)
cache.set("key3", val)
cache.set("key4", val)
self.assertEqual(cache.size, 40)
cache.prune()
self.assertEqual(cache.size, 10)
def test_min_time_clear(self):
cache = Cache(self.__dir, 40, min_time=1)
val = b"0123456789"
cache.set("key1", val)
cache.set("key2", val)
time.sleep(1)
cache.set("key3", val)
cache.set("key4", val)
self.assertEqual(cache.size, 40)
cache.clear()
self.assertEqual(cache.size, 20)
time.sleep(1)
cache.clear()
self.assertEqual(cache.size, 0)
def test_not_expired(self):
cache = Cache(self.__dir, 40, min_time=1)
val = b"0123456789"
cache.set("key1", val)
with self.assertRaises(ProtectedError):
cache.delete("key1")
time.sleep(1)
cache.delete("key1")
self.assertEqual(cache.size, 0)
def test_missing_cache_file(self):
cache = Cache(self.__dir, 10, min_time=0)
val = b"0123456789"
os.remove(cache.set("key", val))
self.assertEqual(cache.size, 10)
self.assertFalse(cache.has("key"))
self.assertEqual(cache.size, 0)
os.remove(cache.set("key", val))
self.assertEqual(cache.size, 10)
with self.assertRaises(CacheMiss):
cache.get("key")
self.assertEqual(cache.size, 0)
if __name__ == "__main__":
unittest.main()
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