update refactoring and add new features

SYS/file_server.py

@@ -1,9 +1,11 @@
 """Simple HTTP file server for serving files in web mode."""
 
+import atexit
+import os
 import threading
 import socket
 import logging
-from http.server import HTTPServer, SimpleHTTPRequestHandler
+from http.server import ThreadingHTTPServer, SimpleHTTPRequestHandler
 from pathlib import Path
 from typing import Optional
 import mimetypes
@@ -11,9 +13,12 @@ import urllib.parse
 
 logger = logging.getLogger(__name__)
 
+_DNS_FALLBACK_HOST = os.environ.get("MM_DNS_SERVER", "8.8.8.8")
+_DNS_FALLBACK_PORT = 80
+
 # Global server instance
-_file_server: Optional[HTTPServer] = None
-_server_thread: Optional[threading.Thread] = None
+_file_server: Optional[ThreadingHTTPServer] = None
+_file_server_thread: Optional[threading.Thread] = None
 _server_port: int = 8001
 
 
@@ -84,7 +89,7 @@ def get_local_ip() -> Optional[str]:
     try:
         # Connect to a remote server to determine local IP
         s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        s.connect(("8.8.8.8", 80))
+        s.connect((_DNS_FALLBACK_HOST, _DNS_FALLBACK_PORT))
         ip = s.getsockname()[0]
         s.close()
         return ip
@@ -116,7 +121,7 @@ def start_file_server(port: int = 8001) -> Optional[str]:
 
         # Create server
         server_address = ("", port)
-        _file_server = HTTPServer(server_address, FileServerHandler)
+        _file_server = ThreadingHTTPServer(server_address, FileServerHandler)
 
         # Start in daemon thread
         _server_thread = threading.Thread(
@@ -125,6 +130,8 @@ def start_file_server(port: int = 8001) -> Optional[str]:
         )
         _server_thread.start()
 
+        atexit.register(stop_file_server)
+
         logger.info(f"File server started on port {port}")
 
         # Get local IP