Add Winloop To the list of loop setups and optional-dependencies

pyproject.toml

@@ -42,6 +42,7 @@ standard = [
     "python-dotenv>=0.13",
     "PyYAML>=5.1",
     "uvloop>=0.14.0,!=0.15.0,!=0.15.1; sys_platform != 'win32' and (sys_platform != 'cygwin' and platform_python_implementation != 'PyPy')",
+    "winloop>=0.1.7; sys_platform == 'win32' or (sys_platform == 'cygwin' and platform_python_implementation != 'PyPy')",
     "watchfiles>=0.13",
     "websockets>=10.4",
 ]

uvicorn/config.py

@@ -27,7 +27,7 @@
 HTTPProtocolType = Literal["auto", "h11", "httptools"]
 WSProtocolType = Literal["auto", "none", "websockets", "wsproto"]
 LifespanType = Literal["auto", "on", "off"]
-LoopSetupType = Literal["none", "auto", "asyncio", "uvloop"]
+LoopSetupType = Literal["none", "auto", "asyncio", "uvloop", "winloop"]
 InterfaceType = Literal["auto", "asgi3", "asgi2", "wsgi"]
 
 LOG_LEVELS: dict[str, int] = {
@@ -59,7 +59,9 @@
     "auto": "uvicorn.loops.auto:auto_loop_setup",
     "asyncio": "uvicorn.loops.asyncio:asyncio_setup",
     "uvloop": "uvicorn.loops.uvloop:uvloop_setup",
+    "winloop": "uvicorn.loops.winloop:winloop_setup",
 }
+
 INTERFACES: list[InterfaceType] = ["auto", "asgi3", "asgi2", "wsgi"]
 
 SSL_PROTOCOL_VERSION: int = ssl.PROTOCOL_TLS_SERVER

uvicorn/loops/auto.py

@@ -2,10 +2,17 @@ def auto_loop_setup(use_subprocess: bool = False) -> None:
     try:
         import uvloop  # noqa
     except ImportError:  # pragma: no cover
-        from uvicorn.loops.asyncio import asyncio_setup as loop_setup
+        try:
+            import winloop  # noqa
+        except ImportError:
+            from uvicorn.loops.asyncio import asyncio_setup as loop_setup
 
-        loop_setup(use_subprocess=use_subprocess)
+            loop_setup(use_subprocess=use_subprocess)
+        else:
+            from uvicorn.loops.winloop import winloop_setup as loop_setup
+
+            loop_setup(use_subprocess=use_subprocess)
     else:  # pragma: no cover
         from uvicorn.loops.uvloop import uvloop_setup
-
         uvloop_setup(use_subprocess=use_subprocess)
+

uvicorn/loops/winloop.py

@@ -0,0 +1,7 @@
+import asyncio
+
+import winloop
+
+
+def winloop_setup(use_subprocess: bool = False) -> None:
+    asyncio.set_event_loop_policy(winloop.EventLoopPolicy())