Add option for /_stop route (for graceful shutdown)

modules/cmd_args.py

@@ -103,3 +103,4 @@ parser.add_argument("--skip-version-check", action='store_true', help="Do not ch
 parser.add_argument("--no-hashing", action='store_true', help="disable sha256 hashing of checkpoints to help loading performance", default=False)
 parser.add_argument("--no-download-sd-model", action='store_true', help="don't download SD1.5 model even if no model is found in --ckpt-dir", default=False)
 parser.add_argument('--subpath', type=str, help='customize the subpath for gradio, use with reverse proxy')
+parser.add_argument('--add-stop-route', action='store_true', help='add /_stop route to stop server')

webui.py

@@ -8,7 +8,7 @@ import warnings
 import json
 from threading import Thread
 
-from fastapi import FastAPI
+from fastapi import FastAPI, Response
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.middleware.gzip import GZipMiddleware
 from packaging import version
@@ -270,6 +270,12 @@ def api_only():
     print(f"Startup time: {startup_timer.summary()}.")
     api.launch(server_name="0.0.0.0" if cmd_opts.listen else "127.0.0.1", port=cmd_opts.port if cmd_opts.port else 7861)
 
+
+def stop_route(request):
+    shared.state.server_command = "stop"
+    return Response("Stopping.")
+
+
 def webui():
     launch_api = cmd_opts.api
     initialize()
@@ -318,6 +324,8 @@ def webui():
             inbrowser=cmd_opts.autolaunch,
             prevent_thread_lock=True
         )
+        if cmd_opts.add_stop_route:
+            app.add_route("/_stop", stop_route, methods=["POST"])
 
         # after initial launch, disable --autolaunch for subsequent restarts
         cmd_opts.autolaunch = False
@@ -359,11 +367,12 @@ def webui():
                     else:
                         print(f"Unknown server command: {server_command}")
         except KeyboardInterrupt:
+            print('Caught KeyboardInterrupt, stopping...')
             server_command = "stop"
 
         if server_command == "stop":
+            print("Stopping server...")
             # If we catch a keyboard interrupt, we want to stop the server and exit.
-            print('Caught KeyboardInterrupt, stopping...')
             shared.demo.close()
             break
         print('Restarting UI...')