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import logging
from concurrent.futures import ThreadPoolExecutor
from unittest import TestCase, mock
from uuid import uuid4
from snekbox.memfs import MemFS
UUID_TEST = uuid4()
def get_memfs_with_context():
return MemFS(10).__enter__()
class NsJailTests(TestCase):
def setUp(self):
super().setUp()
self.logger = logging.getLogger("snekbox.memfs")
self.logger.setLevel(logging.WARNING)
@mock.patch("snekbox.memfs.uuid4", lambda: UUID_TEST)
def test_assignment_thread_safe(self):
"""Test concurrent mounting works in multi-thread environments."""
# Concurrently create MemFS in threads, check only 1 can be created
# Others should result in RuntimeError
with ThreadPoolExecutor() as pool:
memfs: MemFS | None = None
futures = [pool.submit(get_memfs_with_context) for _ in range(8)]
for future in futures:
# We should have exactly one result and all others RuntimeErrors
if err := future.exception():
self.assertIsInstance(err, RuntimeError)
else:
self.assertIsNone(memfs)
memfs = future.result()
# Original memfs should still exist afterwards
self.assertIsInstance(memfs, MemFS)
self.assertTrue(memfs.path.exists())
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