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import os
import unittest
from test.support import import_helper, threading_helper
from test.support.threading_helper import run_concurrently
from uuid import SafeUUID
c_uuid = import_helper.import_module("_uuid")
NTHREADS = 10
UUID_PER_THREAD = 1000
@threading_helper.requires_working_threading()
class UUIDTests(unittest.TestCase):
@unittest.skipUnless(os.name == "posix", "POSIX only")
def test_generate_time_safe(self):
uuids = []
def worker():
local_uuids = []
for _ in range(UUID_PER_THREAD):
uuid, is_safe = c_uuid.generate_time_safe()
self.assertIs(type(uuid), bytes)
self.assertEqual(len(uuid), 16)
# Collect the UUID only if it is safe. If not, we cannot ensure
# UUID uniqueness. According to uuid_generate_time_safe() man
# page, it is theoretically possible for two concurrently
# running processes to generate the same UUID(s) if the return
# value is not 0.
if is_safe == SafeUUID.safe:
local_uuids.append(uuid)
# Merge all safe uuids
uuids.extend(local_uuids)
run_concurrently(worker_func=worker, nthreads=NTHREADS)
self.assertEqual(len(uuids), len(set(uuids)))
@unittest.skipUnless(os.name == "nt", "Windows only")
def test_UuidCreate(self):
uuids = []
def worker():
local_uuids = []
for _ in range(UUID_PER_THREAD):
uuid = c_uuid.UuidCreate()
self.assertIs(type(uuid), bytes)
self.assertEqual(len(uuid), 16)
local_uuids.append(uuid)
# Merge all uuids
uuids.extend(local_uuids)
run_concurrently(worker_func=worker, nthreads=NTHREADS)
self.assertEqual(len(uuids), len(set(uuids)))
if __name__ == "__main__":
unittest.main()
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