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147 lines
4.8 KiB
Python
147 lines
4.8 KiB
Python
import asyncio
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import os
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from unittest import mock
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from asgiref.sync import async_to_sync, iscoroutinefunction
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from django.core.cache import DEFAULT_CACHE_ALIAS, caches
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from django.core.exceptions import ImproperlyConfigured, SynchronousOnlyOperation
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from django.http import HttpResponse, HttpResponseNotAllowed
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from django.test import RequestFactory, SimpleTestCase
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from django.utils.asyncio import async_unsafe
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from django.views.generic.base import View
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from .models import SimpleModel
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class CacheTest(SimpleTestCase):
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def test_caches_local(self):
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@async_to_sync
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async def async_cache():
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return caches[DEFAULT_CACHE_ALIAS]
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cache_1 = async_cache()
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cache_2 = async_cache()
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self.assertIs(cache_1, cache_2)
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class DatabaseConnectionTest(SimpleTestCase):
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"""A database connection cannot be used in an async context."""
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async def test_get_async_connection(self):
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with self.assertRaises(SynchronousOnlyOperation):
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list(SimpleModel.objects.all())
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class AsyncUnsafeTest(SimpleTestCase):
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"""
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async_unsafe decorator should work correctly and returns the correct
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message.
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"""
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@async_unsafe
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def dangerous_method(self):
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return True
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async def test_async_unsafe(self):
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# async_unsafe decorator catches bad access and returns the right
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# message.
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msg = (
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"You cannot call this from an async context - use a thread or "
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"sync_to_async."
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)
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with self.assertRaisesMessage(SynchronousOnlyOperation, msg):
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self.dangerous_method()
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@mock.patch.dict(os.environ, {"DJANGO_ALLOW_ASYNC_UNSAFE": "true"})
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@async_to_sync # mock.patch() is not async-aware.
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async def test_async_unsafe_suppressed(self):
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# Decorator doesn't trigger check when the environment variable to
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# suppress it is set.
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try:
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self.dangerous_method()
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except SynchronousOnlyOperation:
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self.fail("SynchronousOnlyOperation should not be raised.")
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class SyncView(View):
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def get(self, request, *args, **kwargs):
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return HttpResponse("Hello (sync) world!")
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class AsyncView(View):
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async def get(self, request, *args, **kwargs):
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return HttpResponse("Hello (async) world!")
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class ViewTests(SimpleTestCase):
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def test_views_are_correctly_marked(self):
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tests = [
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(SyncView, False),
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(AsyncView, True),
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]
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for view_cls, is_async in tests:
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with self.subTest(view_cls=view_cls, is_async=is_async):
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self.assertIs(view_cls.view_is_async, is_async)
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callback = view_cls.as_view()
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self.assertIs(iscoroutinefunction(callback), is_async)
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def test_mixed_views_raise_error(self):
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class MixedView(View):
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def get(self, request, *args, **kwargs):
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return HttpResponse("Hello (mixed) world!")
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async def post(self, request, *args, **kwargs):
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return HttpResponse("Hello (mixed) world!")
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msg = (
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f"{MixedView.__qualname__} HTTP handlers must either be all sync or all "
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"async."
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)
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with self.assertRaisesMessage(ImproperlyConfigured, msg):
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MixedView.as_view()
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def test_options_handler_responds_correctly(self):
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tests = [
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(SyncView, False),
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(AsyncView, True),
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]
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for view_cls, is_coroutine in tests:
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with self.subTest(view_cls=view_cls, is_coroutine=is_coroutine):
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instance = view_cls()
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response = instance.options(None)
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self.assertIs(
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asyncio.iscoroutine(response),
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is_coroutine,
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)
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if is_coroutine:
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response = asyncio.run(response)
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self.assertIsInstance(response, HttpResponse)
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def test_http_method_not_allowed_responds_correctly(self):
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request_factory = RequestFactory()
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tests = [
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(SyncView, False),
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(AsyncView, True),
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]
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for view_cls, is_coroutine in tests:
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with self.subTest(view_cls=view_cls, is_coroutine=is_coroutine):
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instance = view_cls()
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response = instance.http_method_not_allowed(request_factory.post("/"))
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self.assertIs(
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asyncio.iscoroutine(response),
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is_coroutine,
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)
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if is_coroutine:
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response = asyncio.run(response)
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self.assertIsInstance(response, HttpResponseNotAllowed)
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def test_base_view_class_is_sync(self):
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"""
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View and by extension any subclasses that don't define handlers are
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sync.
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"""
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self.assertIs(View.view_is_async, False)
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