Allow only one instance of debugpy to be started across the process

Author: mrexodia

ida/idacode_utils/socket_handler.py

@@ -12,14 +12,28 @@ def create_env():
         "__name__": "__main__"
     }
 
+debugpy_host = ""
+debugpy_port = 0
+
 def start_debug_server():
+    # At most one instance of debugpy can ever be created per process.
+    # Reference: https://github.com/microsoft/debugpy/issues/297
+    global debugpy_host, debugpy_port
+    if debugpy_port and debugpy_port:
+        print("[IDACode] debugpy server is already listening on {}:{}".format(debugpy_host, debugpy_port))
+        return
+
+    # Install hook for os.getcwd
+    hooks.install()
+
+    # Start debugpy server
     if settings.LOGGING:
         tmp_path = tempfile.gettempdir()
         debugpy.log_to(tmp_path)
         print("[IDACode] Logging to {} with pattern debugpy.*.log".format(tmp_path))
-    debugpy.configure({ "python": settings.PYTHON })
-    debugpy.listen((settings.HOST, settings.DEBUG_PORT))
-    print("[IDACode] IDACode debug server listening on {address}:{port}".format(address=settings.HOST, port=settings.DEBUG_PORT))
+    debugpy.configure(python=settings.PYTHON)
+    debugpy_host, debugpy_port = debugpy.listen((settings.HOST, settings.DEBUG_PORT))
+    print("[IDACode] Started debugpy server on {}:{}".format(debugpy_host, debugpy_port))
 
 class SocketHandler(tornado.websocket.WebSocketHandler):
     def open(self):