def test_set_already_exists_extend_expiry_on_get_true(self):
key1, expected1 = 'key1', 'value1'
# sleep_time is less then expiry but we sleep twice below so the total time
# is greater than expiry and would have made the key expire
# had it not been for extend_expiry_on_get=True
expiry = 0.5
sleep_time = expiry - expiry * 0.01
c = Cache(extend_expiry_on_get=True)
c.set(key1, expected1, expiry)
sleep(sleep_time)
returned1_a = c.get(key1)
returned1_b = c.get(key1, True)
self.assertEquals(returned1_a, expected1)
self.assertEquals(len(c), 1)
self.assertEquals(returned1_b.value, expected1)
sleep(sleep_time)
returned1_a = c.get(key1)
returned1_b = c.get(key1, True)
self.assertEquals(returned1_a, expected1)
self.assertEquals(len(c), 1)
self.assertEquals(returned1_b.value, expected1)
def test_max_item_size_number_value(self):
key1, expected1 = 'key1', sys.maxint
key2, expected2 = 'key2', 10.0**10
key3, expected3 = 'key3', Decimal(2.2**2.2)
key4, expected4 = 'key4', 123.45j + 6789
c = Cache(max_item_size=1)
# No exception should be raised by the calls below as all values are numbers
c.set(key1, expected1)
c.set(key2, expected2)
c.set(key3, expected3)
c.set(key4, expected4)
returned1 = c.get(key1)
self.assertEquals(returned1, expected1)
returned2 = c.get(key2)
self.assertEquals(returned2, expected2)
returned3 = c.get(key3)
self.assertEquals(returned3, expected3)
returned4 = c.get(key4)
self.assertEquals(returned4, expected4)
def test_set_already_exists_extend_expiry_on_get_false(self):
key1, expected1 = 'key1', 'value1'
# Unlike in test_set_already_exists_extend_expiry_on_get_false,
# in this test case extend_expiry_on_get=False so .get won't extend it.
expiry = 0.5
sleep_time = expiry - expiry * 0.01
c = Cache(extend_expiry_on_get=False)
c.set(key1, expected1, expiry)
sleep(sleep_time)
returned1_a = c.get(key1)
returned1_b = c.get(key1, True)
self.assertEquals(returned1_a, expected1)
self.assertEquals(len(c), 1)
self.assertEquals(returned1_b.value, expected1)
sleep(sleep_time)
self.assertRaises(KeyExpiredError, c.get, key1)
self.assertRaises(KeyError, c.get, key1, True)
def test_set_defaults(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key2_expiry = 1000
c = Cache()
c.set(key1, expected1)
c.set(key2, expected2, key2_expiry)
returned1 = c.get(key1, True)
sleep(0.01)
self.assertEquals(returned1.value, expected1)
self.assertEquals(returned1.expiry, 0.0)
self.assertEquals(returned1.expires_at, 0.0)
self.assertEquals(returned1.hits, 1)
self.assertEquals(returned1.prev_read, 0.0)
self.assertEquals(returned1.prev_write, 0.0)
self.assertLess(returned1.last_read, c.get_timestamp())
self.assertLess(returned1.last_write, c.get_timestamp())
returned2 = c.get(key2, True)
sleep(0.01)
self.assertEquals(returned2.value, expected2)
self.assertEquals(returned2.expiry, key2_expiry)
self.assertLess(c.get_timestamp() - returned2.expires_at, key2_expiry)
self.assertEquals(returned2.hits, 1)
self.assertLess(returned2.last_read, c.get_timestamp())
self.assertLess(returned2.last_write, c.get_timestamp())
self.assertEquals(returned2.prev_read, 0.0)
self.assertEquals(returned2.prev_write, 0.0)
def test_max_item_size_no_exception(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache(max_item_size=6)
# No exception should be raised by the calls below as all values are not greater than max_item_size
c.set(key1, expected1)
c.set(key2, expected2)
c.set(key3, expected3)
def test_set_already_exists_no_expiry(self):
key1, expected1 = 'key1', 'value1'
expected1_new = 'value1_new'
c = Cache()
c.set(key1, expected1)
c.set(key1, expected1_new)
returned1_a = c.get(key1)
returned1_b = c.get(key1, True)
self.assertEquals(len(c), 1)
self.assertEquals(returned1_a, expected1_new)
self.assertEquals(returned1_b.value, expected1_new)
def test_max_item_size_python_object(self):
class MyClass(object):
a = '1' * 10000
b = 2.0**20
instance = MyClass()
key1, expected1 = 'key1', instance
c = Cache(max_item_size=1)
# No exception should be raised by the calls below value is a non-string Python object
c.set(key1, expected1)
returned1 = c.get(key1)
self.assertIs(returned1, expected1)
def test_set_already_exists_extend_expiry_on_set_true(self):
key1, expected1 = 'key1', 'value1'
expected1_new = 'value1_new'
c = Cache(extend_expiry_on_set=True)
c.set(key1, expected1, 0.1)
sleep(0.11)
c.set(key1, expected1_new)
returned1_a = c.get(key1)
returned1_b = c.get(key1, True)
self.assertEquals(len(c), 1)
self.assertEquals(returned1_a, expected1_new)
self.assertEquals(returned1_b.value, expected1_new)
def test_set_already_exists_extend_expiry_on_set_false(self):
key1, expected1 = 'key1', 'value1'
expected1_new = 'value1_new'
c = Cache(extend_expiry_on_set=False)
c.set(key1, expected1, 0.1)
sleep(0.11)
self.assertRaises(KeyExpiredError, c.set, key1, expected1_new)
self.assertEquals(len(c), 0)
self.assertListEqual(c._expired_on_op, [key1])
deleted = c.delete_expired()
self.assertEquals(sorted(deleted), [key1])
self.assertListEqual(c._expired_on_op, [])
def test_hits_per_position(self):
max_size = 2
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache(max_size)
c.set(key1, expected1)
c.set(key2, expected2)
c.set(key3, expected3)
self.assertEquals(len(c.hits_per_position), 2)
self.assertEquals(c.hits_per_position[0], 0)
self.assertEquals(c.hits_per_position[1], 0)
# Right now index0 is key3, so when we look up this key 3 times, we always find it at index0
c.get('key3')
c.get('key3')
c.get('key3')
self.assertEquals(c.hits_per_position[0], 3)
# Now get key2 which will be found at index1 and getting it will move it to index0
c.get('key2')
self.assertEquals(c.hits_per_position[1], 1)
# Now key2 is at index0 so getting this key will increase index0's counter
c.get('key2')
c.get('key2')
c.get('key2')
self.assertEquals(c.hits_per_position[0], 6)
# Make sure index1's counter is still the same as it was
self.assertEquals(c.hits_per_position[1], 1)
# Looking up unknown keys should not increase any counters
try:
c.get(uuid4().hex)
except KeyError:
pass
self.assertEquals(len(c.hits_per_position), 2)
self.assertEquals(c.hits_per_position[0], 6)
self.assertEquals(c.hits_per_position[1], 1)
def test_del(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache()
c.set(key1, expected1)
c.set(key2, expected2)
c.set(key3, expected3)
c.delete(key1)
self.assertEquals(len(c), 2)
self.assertNotIn(key1, c)
self.assertIn(key2, c)
self.assertIn(key3, c)
def test_max_item_size_str_value_exceeded(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value33'
c = Cache(max_item_size=6)
# The first two must succeed
c.set(key1, expected1)
c.set(key2, expected2)
# This fails because expected3 is > than max_item_size
try:
c.set(key3, expected3)
except ValueError, e:
self.assertEquals(e.message, 'Value too long 7 > 6')
def test_set_get(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache()
c.set(key1, expected1, 1.0, None)
c.set(key2, expected2, 1.0, None)
c.set(key3, expected3, 1.0, None)
returned1 = c.get(key1, None, False)
self.assertEquals(returned1, expected1)
returned2 = c.get(key2, None, False)
self.assertEquals(returned2, expected2)
returned3 = c.get(key3, None, False)
self.assertEquals(returned3, expected3)
def test_set_get(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache()
c.set(key1, expected1)
c.set(key2, expected2)
c.set(key3, expected3)
returned1 = c.get(key1)
self.assertEquals(returned1, expected1)
returned2 = c.get(key2)
self.assertEquals(returned2, expected2)
returned3 = c.get(key3)
self.assertEquals(returned3, expected3)
def test_max_item_size_str_value_exceeded(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value33'
c = Cache(max_item_size=6)
# The first two must succeed
c.set(key1, expected1, 0.0, None)
c.set(key2, expected2, 0.0, None)
# This fails because expected3 is > than max_item_size
try:
c.set(key3, expected3, 0.0, None)
except ValueError as e:
self.assertEquals(e.message, 'Value too long 7 > 6')
else:
self.fail('Expected aValueError to be raised')
def test_delete_expired(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache()
c.set(key1, expected1, 0.1, None)
c.set(key2, expected2, 0.0, None)
c.set(key3, expected3, 0.03, None)
sleep(0.12)
deleted = c.delete_expired()
self.assertEquals(sorted(deleted), [key1, key3])
self.assertEquals(len(c), 1)
self.assertNotIn(key1, c)
self.assertIn(key2, c)
self.assertNotIn(key3, c)
def test_get_deletes_expired_key(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache()
c.set(key1, expected1, 0.03)
c.set(key2, expected2)
c.set(key3, expected3, 0.05)
sleep(0.12)
self.assertRaises(KeyExpiredError, c.get, key1)
self.assertRaises(KeyExpiredError, c.get, key3)
self.assertEquals(len(c), 1)
self.assertNotIn(key1, c)
self.assertIn(key2, c)
self.assertNotIn(key3, c)
# It will be arranged in the same order as .get were called in
self.assertListEqual(c._expired_on_op, [key1, key3])
deleted = c.delete_expired()
self.assertEquals(sorted(deleted), [key1, key3])
self.assertListEqual(c._expired_on_op, [])
def test_set_eviction_on_full(self):
max_size = 2
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache(max_size)
c.set(key1, expected1)
c.set(key2, expected2)
c.set(key3, expected3)
# The value of max_size is 2 but we added 3 keys and there were no .get in between .set calls,
# so we now expect that the first key will have been evicted and only key2 and key3 still exist.
self.assertEquals(len(c), 2)
self.assertEquals(c.max_size, 2)
self.assertEquals(c.set_ops, 3)
self.assertEquals(c.get_ops, 0)
self.assertEquals(c.index(key3), 0)
self.assertEquals(c.index(key2), 1)
self.assertIsNone(c.index(key1))
def test_set_get_with_details(self):
key1, expected1 = 'key1', 'value1'
key2, expected2 = 'key2', 'value2'
key3, expected3 = 'key3', 'value3'
c = Cache()
c.set(key1, expected1)
c.set(key2, expected2)
c.set(key3, expected3)
# Add one second to be sure that at least that much time elapsed between when keys were stored and current time.
now = c.get_timestamp() + 1
returned1 = c.get(key1, True)
self.assertEquals(returned1.value, expected1)
self.assertEquals(returned1.position, 2)
self.assertLess(returned1.last_read, now)
self.assertLess(returned1.last_write, now)
self.assertLess(returned1.prev_read, now)
self.assertLess(returned1.prev_write, now)
returned2 = c.get(key2, True)
self.assertEquals(returned2.value, expected2)
self.assertEquals(returned2.position, 2)
self.assertLess(returned2.last_read, now)
self.assertLess(returned2.last_write, now)
self.assertLess(returned2.prev_read, now)
self.assertLess(returned2.prev_write, now)
returned3 = c.get(key3, True)
self.assertEquals(returned3.value, expected3)
self.assertEquals(returned3.position, 2)
self.assertLess(returned3.last_read, now)
self.assertLess(returned3.last_write, now)
self.assertLess(returned3.prev_read, now)
self.assertLess(returned3.prev_write, now)
