Fix issue #5746: [Bug]: Broken "Open in VSCode" button

frontend/src/components/features/file-explorer/file-explorer.tsx

@@ -49,12 +49,13 @@ export function FileExplorer({ isOpen, onToggle }: FileExplorerProps) {
         ),
       );
       window.open(vscodeUrl.vscode_url, "_blank");
-    } else if (vscodeUrl?.error) {
+    } else {
+      const errorMessage = vscodeUrl?.error || t(I18nKey.EXPLORER$VSCODE_SWITCHING_ERROR_MESSAGE, {
+        error: "VSCode server is not ready. Please try again in a few seconds.",
+      });
       toast.error(
         `open-vscode-error-${new Date().getTime()}`,
-        t(I18nKey.EXPLORER$VSCODE_SWITCHING_ERROR_MESSAGE, {
-          error: vscodeUrl.error,
-        }),
+        errorMessage,
       );
     }
   };

openhands/runtime/plugins/vscode/__init__.py

@@ -35,17 +35,19 @@ class VSCodePlugin(Plugin):
             stderr=subprocess.STDOUT,
             shell=True,
         )
-        # read stdout until the kernel gateway is ready
+        # Wait for the VSCode server to start and be ready
         output = ''
-        while should_continue() and self.gateway_process.stdout is not None:
-            line = self.gateway_process.stdout.readline().decode('utf-8')
-            print(line)
-            output += line
-            if 'at' in line:
-                break
+        start_time = time.time()
+        timeout = 30  # 30 seconds timeout
+        
+        while should_continue() and time.time() - start_time < timeout:
+            if not check_port_available(self.vscode_port):
+                # Port is in use, which means server is running
+                logger.debug(f'VSCode server started at port {self.vscode_port}')
+                return
             time.sleep(1)
             logger.debug('Waiting for VSCode server to start...')
 
-        logger.debug(
-            f'VSCode server started at port {self.vscode_port}. Output: {output}'
-        )
+        if check_port_available(self.vscode_port):
+            logger.error('VSCode server failed to start within timeout period')
+            raise RuntimeError('VSCode server failed to start within timeout period')