Fixed #33735 -- Added async support to StreamingHttpResponse.

Thanks to Florian Vazelle for initial exploratory work, and to Nick
Pope and Mariusz Felisiak for review.

1 files changed, 25 insertions, 0 deletions

diff --git a/django/utils/asyncio.py b/django/utils/asyncio.py
index 1e79f90c2c..eea2df48e2 100644
--- a/django/utils/asyncio.py
+++ b/django/utils/asyncio.py
@@ -37,3 +37,28 @@ def async_unsafe(message):
         return decorator(func)
     else:
         return decorator
+
+
+try:
+    from contextlib import aclosing
+except ImportError:
+    # TODO: Remove when dropping support for PY39.
+    from contextlib import AbstractAsyncContextManager
+
+    # Backport of contextlib.aclosing() from Python 3.10. Copyright (C) Python
+    # Software Foundation (see LICENSE.python).
+    class aclosing(AbstractAsyncContextManager):
+        """
+        Async context manager for safely finalizing an asynchronously
+        cleaned-up resource such as an async generator, calling its
+        ``aclose()`` method.
+        """
+
+        def __init__(self, thing):
+            self.thing = thing
+
+        async def __aenter__(self):
+            return self.thing
+
+        async def __aexit__(self, *exc_info):
+            await self.thing.aclose()