def default_time():
"""Generate a TimeUUID from the current local date and time. uuid
generator is provided by DSE, to be stored in Cassandra
:return: A uuid
:rtype: uuid.UUID
"""
return uuid_from_time(datetime.now())
def test_conversion_specific_date(self):
dt = datetime(1981, 7, 11, microsecond=555000)
uuid = util.uuid_from_time(dt)
from uuid import UUID
assert isinstance(uuid, UUID)
ts = (uuid.time - 0x01b21dd213814000) / 1e7 # back to a timestamp
new_dt = datetime.utcfromtimestamp(ts)
# checks that we created a UUID1 with the proper timestamp
assert new_dt == dt
def test_uuid_from_time(self):
t = time.time()
seq = 0x2aa5
node = uuid.getnode()
u = util.uuid_from_time(t, node, seq)
# using AlmostEqual because time precision is different for
# some platforms
self.assertAlmostEqual(util.unix_time_from_uuid1(u), t, 4)
self.assertEqual(u.node, node)
self.assertEqual(u.clock_seq, seq)
# random node
u1 = util.uuid_from_time(t, clock_seq=seq)
u2 = util.uuid_from_time(t, clock_seq=seq)
self.assertAlmostEqual(util.unix_time_from_uuid1(u1), t, 4)
self.assertAlmostEqual(util.unix_time_from_uuid1(u2), t, 4)
self.assertEqual(u.clock_seq, seq)
# not impossible, but we shouldn't get the same value twice
self.assertNotEqual(u1.node, u2.node)
# random seq
u1 = util.uuid_from_time(t, node=node)
u2 = util.uuid_from_time(t, node=node)
self.assertAlmostEqual(util.unix_time_from_uuid1(u1), t, 4)
self.assertAlmostEqual(util.unix_time_from_uuid1(u2), t, 4)
self.assertEqual(u.node, node)
# not impossible, but we shouldn't get the same value twice
self.assertNotEqual(u1.clock_seq, u2.clock_seq)
# node too large
with self.assertRaises(ValueError):
u = util.uuid_from_time(t, node=2 ** 48)
# clock_seq too large
with self.assertRaises(ValueError):
u = util.uuid_from_time(t, clock_seq=0x4000)
# construct from datetime
dt = util.datetime_from_timestamp(t)
u = util.uuid_from_time(dt, node, seq)
self.assertAlmostEqual(util.unix_time_from_uuid1(u), t, 4)
self.assertEqual(u.node, node)
self.assertEqual(u.clock_seq, seq)
def default_time():
"""Generate a TimeUUID from the current local date and time"""
return uuid_from_time(datetime.now())