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import logging
from concurrent.futures import ThreadPoolExecutor
from operator import attrgetter
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 MemFSTests(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())
def test_no_context_error(self):
"""Accessing MemFS attributes before __enter__ raises RuntimeError."""
cases = [
attrgetter("path"),
attrgetter("name"),
attrgetter("home"),
attrgetter("output"),
lambda fs: fs.mkdir(""),
lambda fs: list(fs.files(1)),
]
memfs = MemFS(10)
for case in cases:
with self.subTest(case=case), self.assertRaises(RuntimeError):
case(memfs)
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