Only change loop policy in non-async methods

sanic/app.py

@@ -1102,6 +1102,9 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
             register_sys_signals=register_sys_signals,
         )
 
+        if self.config.USE_UVLOOP:
+            use_uvloop()
+
         try:
             self.is_running = True
             self.is_stopping = False
@@ -1213,7 +1216,7 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
             ssl=ssl,
             sock=sock,
             unix=unix,
-            loop=True,
+            loop=get_event_loop(),
             protocol=protocol,
             backlog=backlog,
             run_async=return_asyncio_server,
@@ -1323,7 +1326,7 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
         sock: Optional[socket] = None,
         unix: Optional[str] = None,
         workers: int = 1,
-        loop: Union[AbstractEventLoop, bool] = None,
+        loop: AbstractEventLoop = None,
         protocol: Type[Protocol] = HttpProtocol,
         backlog: int = 100,
         register_sys_signals: bool = True,
@@ -1356,13 +1359,6 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
             display_host = f"[{host}]" if ":" in host else host
             serve_location = f"{proto}://{display_host}:{port}"
 
-        if not isinstance(loop, AbstractEventLoop):
-            if self.config.USE_UVLOOP:
-                use_uvloop()
-
-            if loop is True:
-                loop = get_event_loop()
-
         ssl = process_to_context(ssl)
 
         server_settings = {
@@ -1459,8 +1455,6 @@ class Sanic(BaseSanic, metaclass=TouchUpMeta):
         details: https://asgi.readthedocs.io/en/latest
         """
         self.asgi = True
-        if self.config.USE_UVLOOP:
-            use_uvloop()
         self.motd("")
         self._asgi_app = await ASGIApp.create(self, scope, receive, send)
         asgi_app = self._asgi_app

tests/test_app.py

@@ -440,6 +440,7 @@ def test_custom_context():
 
     assert app.ctx == ctx
 
+
 def test_uvloop_usage(app, monkeypatch):
     @app.get("/test")
     def handler(request):
@@ -457,7 +458,7 @@ def test_uvloop_usage(app, monkeypatch):
     use_uvloop.assert_called_once()
 
 
-def test_uvloop_usage_with_create_server(app, monkeypatch):
+def test_uvloop_is_ignored_with_create_server(app, monkeypatch):
     @app.get("/test")
     def handler(request):
         return text("ok")
@@ -481,7 +482,8 @@ def test_uvloop_usage_with_create_server(app, monkeypatch):
         asyncio_server_kwargs=dict(start_serving=False)
     )
     loop.run_until_complete(asyncio_srv_coro)
-    use_uvloop.assert_called_once()
+    use_uvloop.assert_not_called()
+
 
 def test_cannot_run_fast_and_workers(app):
     message = "You cannot use both fast=True and workers=X"