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import os
import sys
from unittest import mock, skipIf
from asgiref.sync import async_to_sync
from django.core.exceptions import SynchronousOnlyOperation
from django.test import SimpleTestCase
from django.utils.asyncio import async_unsafe
from .models import SimpleModel
@skipIf(sys.platform == 'win32' and (3, 8, 0) < sys.version_info < (3, 8, 1), 'https://bugs.python.org/issue38563')
class DatabaseConnectionTest(SimpleTestCase):
"""A database connection cannot be used in an async context."""
@async_to_sync
async def test_get_async_connection(self):
with self.assertRaises(SynchronousOnlyOperation):
list(SimpleModel.objects.all())
@skipIf(sys.platform == 'win32' and (3, 8, 0) < sys.version_info < (3, 8, 1), 'https://bugs.python.org/issue38563')
class AsyncUnsafeTest(SimpleTestCase):
"""
async_unsafe decorator should work correctly and returns the correct
message.
"""
@async_unsafe
def dangerous_method(self):
return True
@async_to_sync
async def test_async_unsafe(self):
# async_unsafe decorator catches bad access and returns the right
# message.
msg = (
'You cannot call this from an async context - use a thread or '
'sync_to_async.'
)
with self.assertRaisesMessage(SynchronousOnlyOperation, msg):
self.dangerous_method()
@mock.patch.dict(os.environ, {'DJANGO_ALLOW_ASYNC_UNSAFE': 'true'})
@async_to_sync
async def test_async_unsafe_suppressed(self):
# Decorator doesn't trigger check when the environment variable to
# suppress it is set.
try:
self.dangerous_method()
except SynchronousOnlyOperation:
self.fail('SynchronousOnlyOperation should not be raised.')
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