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import unittest
from cachetools import TTLCache
from . import CacheTestMixin
class Timer:
def __init__(self, auto=False):
self.auto = auto
self.time = 0
def __call__(self):
if self.auto:
self.time += 1
return self.time
def tick(self):
self.time += 1
class TTLCacheTest(unittest.TestCase, CacheTestMixin):
def cache(self, maxsize, ttl=0, missing=None, getsizeof=None):
return TTLCache(maxsize, ttl, timer=Timer(), missing=missing,
getsizeof=getsizeof)
def test_lru(self):
cache = self.cache(maxsize=2)
cache[1] = 1
cache[2] = 2
cache[3] = 3
self.assertEqual(len(cache), 2)
self.assertNotIn(1, cache)
self.assertEqual(cache[2], 2)
self.assertEqual(cache[3], 3)
cache[2]
cache[4] = 4
self.assertEqual(len(cache), 2)
self.assertNotIn(1, cache)
self.assertEqual(cache[2], 2)
self.assertNotIn(3, cache)
self.assertEqual(cache[4], 4)
cache[5] = 5
self.assertEqual(len(cache), 2)
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
self.assertNotIn(3, cache)
self.assertEqual(cache[4], 4)
self.assertEqual(cache[5], 5)
def test_ttl(self):
cache = self.cache(maxsize=2, ttl=1)
self.assertEqual(0, cache.timer())
self.assertEqual(1, cache.ttl)
cache[1] = 1
self.assertEqual({1}, set(cache))
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.currsize)
self.assertEqual(1, cache[1])
cache.timer.tick()
self.assertEqual({1}, set(cache))
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.currsize)
self.assertEqual(1, cache[1])
cache[2] = 2
self.assertEqual({1, 2}, set(cache))
self.assertEqual(2, len(cache))
self.assertEqual(2, cache.currsize)
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
cache.timer.tick()
self.assertEqual({2}, set(cache))
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.currsize)
self.assertNotIn(1, cache)
self.assertEqual(2, cache[2])
cache[3] = 3
self.assertEqual({2, 3}, set(cache))
self.assertEqual(2, len(cache))
self.assertEqual(2, cache.currsize)
self.assertNotIn(1, cache)
self.assertEqual(2, cache[2])
self.assertEqual(3, cache[3])
cache.timer.tick()
self.assertEqual({3}, set(cache))
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.currsize)
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
self.assertEqual(3, cache[3])
cache.timer.tick()
self.assertEqual(set(), set(cache))
self.assertEqual(0, len(cache))
self.assertEqual(0, cache.currsize)
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
self.assertNotIn(3, cache)
with self.assertRaises(KeyError):
del cache[1]
with self.assertRaises(KeyError):
cache.pop(2)
def test_expire(self):
cache = self.cache(maxsize=3, ttl=2)
with cache.timer as time:
self.assertEqual(time, cache.timer())
self.assertEqual(2, cache.ttl)
cache[1] = 1
cache.timer.tick()
cache[2] = 2
cache.timer.tick()
cache[3] = 3
self.assertEqual(2, cache.timer())
self.assertEqual({1, 2, 3}, set(cache))
self.assertEqual(3, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
self.assertEqual(3, cache[3])
cache.expire()
self.assertEqual({1, 2, 3}, set(cache))
self.assertEqual(3, len(cache))
self.assertEqual(3, cache.currsize)
self.assertEqual(1, cache[1])
self.assertEqual(2, cache[2])
self.assertEqual(3, cache[3])
cache.expire(3)
self.assertEqual({2, 3}, set(cache))
self.assertEqual(2, len(cache))
self.assertEqual(2, cache.currsize)
self.assertNotIn(1, cache)
self.assertEqual(2, cache[2])
self.assertEqual(3, cache[3])
cache.expire(4)
self.assertEqual({3}, set(cache))
self.assertEqual(1, len(cache))
self.assertEqual(1, cache.currsize)
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
self.assertEqual(3, cache[3])
cache.expire(5)
self.assertEqual(set(), set(cache))
self.assertEqual(0, len(cache))
self.assertEqual(0, cache.currsize)
self.assertNotIn(1, cache)
self.assertNotIn(2, cache)
self.assertNotIn(3, cache)
def test_atomic(self):
cache = TTLCache(maxsize=1, ttl=1, timer=Timer(auto=True))
cache[1] = 1
self.assertEqual(1, cache[1])
cache[1] = 1
self.assertEqual(1, cache.get(1))
cache[1] = 1
self.assertEqual(1, cache.pop(1))
cache[1] = 1
self.assertEqual(1, cache.setdefault(1))
def test_tuple_key(self):
cache = self.cache(maxsize=1, ttl=0)
self.assertEqual(0, cache.ttl)
cache[(1, 2, 3)] = 42
self.assertEqual(42, cache[(1, 2, 3)])
cache.timer.tick()
with self.assertRaises(KeyError):
cache[(1, 2, 3)]
self.assertNotIn((1, 2, 3), cache)
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