Fix #9046 /sdapi/v1/txt2img endpoint not working

**Describe what this pull request is trying to achieve.**

Fix https://github.com/AUTOMATIC1111/stable-diffusion-webui/issues/9046

**Environment this was tested in**

* OS: Linux
* Browser: chrome
* Graphics card: RTX 3090

1 files changed, 41 insertions, 0 deletions

diff --git a/webui.py b/webui.py
index b570895f..8927aa33 100644
--- a/webui.py
+++ b/webui.py
@@ -5,6 +5,7 @@ import importlib
 import signal

 import re

 import warnings

+import asyncio

 from fastapi import FastAPI

 from fastapi.middleware.cors import CORSMiddleware

 from fastapi.middleware.gzip import GZipMiddleware

@@ -66,6 +67,46 @@ if cmd_opts.server_name:
 else:

     server_name = "0.0.0.0" if cmd_opts.listen else None

 

+if sys.platform == "win32" and hasattr(asyncio, "WindowsSelectorEventLoopPolicy"):

+    # "Any thread" and "selector" should be orthogonal, but there's not a clean

+    # interface for composing policies so pick the right base.

+    _BasePolicy = asyncio.WindowsSelectorEventLoopPolicy  # type: ignore

+else:

+    _BasePolicy = asyncio.DefaultEventLoopPolicy

+

+

+class AnyThreadEventLoopPolicy(_BasePolicy):  # type: ignore

+    """Event loop policy that allows loop creation on any thread.

+

+    The default `asyncio` event loop policy only automatically creates

+    event loops in the main threads. Other threads must create event

+    loops explicitly or `asyncio.get_event_loop` (and therefore

+    `.IOLoop.current`) will fail. Installing this policy allows event

+    loops to be created automatically on any thread, matching the

+    behavior of Tornado versions prior to 5.0 (or 5.0 on Python 2).

+

+    Usage::

+

+        asyncio.set_event_loop_policy(AnyThreadEventLoopPolicy())

+

+    .. versionadded:: 5.0

+

+    """

+

+    def get_event_loop(self) -> asyncio.AbstractEventLoop:

+        try:

+            return super().get_event_loop()

+        except (RuntimeError, AssertionError):

+            # This was an AssertionError in python 3.4.2 (which ships with debian jessie)

+            # and changed to a RuntimeError in 3.4.3.

+            # "There is no current event loop in thread %r"

+            loop = self.new_event_loop()

+            self.set_event_loop(loop)

+            return loop

+

+

+asyncio.set_event_loop_policy(AnyThreadEventLoopPolicy())

+

 

 def check_versions():

     if shared.cmd_opts.skip_version_check: