add nest_asyncio

Author: Archmonger

CHANGELOG.md

@@ -41,6 +41,7 @@ Using the following categories, list your changes in this order:
 ### Added
 
 -   ReactPy Websocket will now decode messages via `orjson` resulting in an ~6% overall performance boost.
+-   Built-in asyncio event loops are now patched via `nest_asyncio` to be re-enterant, resulting in an ~10% overall performance boost. This has no performance impact if you are running your webserver with `uvloop`.
 
 ### Changed
 
@@ -49,6 +50,8 @@ Using the following categories, list your changes in this order:
 ### Fixed
 
 -   Fix bug where `REACTPY_WEBSOCKET_URL` always generates a warning if unset.
+-   Fixed bug where `assert f is self._write_fut` would be raised within Uvicorn on Windows when `REACTPY_BACKHAUL_THREAD = True`.
+-   Fixed bug where rendering behavior would be jittery with Daphne on Windows when `REACTPY_BACKHAUL_THREAD = True`.
 
 ## [3.3.1] - 2023-08-08
 

requirements/pkg-deps.txt

@@ -3,5 +3,6 @@ django >=4.1.0
 reactpy >=1.0.0, <1.1.0
 aiofile >=3.0
 dill >=0.3.5
-orjson >=3.0.0
+orjson >=3.6.0
+nest_asyncio >=1.5.0
 typing_extensions

src/reactpy_django/__init__.py

@@ -1,3 +1,7 @@
+import contextlib
+
+import nest_asyncio
+
 from reactpy_django import checks, components, decorators, hooks, types, utils
 from reactpy_django.websocket.paths import REACTPY_WEBSOCKET_PATH
 
@@ -11,3 +15,9 @@
     "utils",
     "checks",
 ]
+# Built-in asyncio event loops can create `assert f is self._write_fut` exceptions
+# while we are using our backhaul thread, so we use this patch to fix this.
+# This also resolves jittery rendering behaviors within Daphne. Can be demonstrated
+# using our "Renders Per Second" test page.
+with contextlib.suppress(ValueError):
+    nest_asyncio.apply()