fix: constantly write script by sftp

lib/data/model/server/server.dart

@@ -10,7 +10,7 @@ class Server implements TagPickable {
   SSHClient? client;
   ServerState state;
 
-  /// Whether is generating client. 
+  /// Whether is generating client.
   /// Use this to avoid reconnecting if last connect try not finished.
   bool isGenerating = false;
 

lib/data/model/sftp/req.dart

@@ -78,14 +78,12 @@ class SftpReqStatus {
       case int:
         size = event;
         break;
-      case Exception:
-        error = event;
-        break;
       case Duration:
         spentTime = event;
         break;
       default:
-        error = Exception('unknown event: $event');
+        error = Exception('sftp worker event: $event');
+        dispose();
     }
     notifyListeners();
   }

lib/data/provider/server.dart

@@ -267,7 +267,7 @@ class ServerProvider extends ChangeNotifier {
 
       final time1 = DateTime.now();
 
-      try { 
+      try {
         if (s.isGenerating) return;
         s.isGenerating = true;
         s.client = await genClient(
@@ -323,6 +323,7 @@ class ServerProvider extends ChangeNotifier {
           s.status.failedInfo = e.toString();
           _setServerState(s, ServerState.failed);
           Loggers.app.warning('Write script to ${spi.name} failed', e);
+          return;
         } finally {
           await file.delete();
         }

lib/data/res/build_data.dart

@@ -2,9 +2,9 @@
 
 class BuildData {
   static const String name = "ServerBox";
-  static const int build = 607;
-  static const String engine = "3.13.7";
-  static const String buildAt = "2023-10-22 14:20:27";
-  static const int modifications = 4;
+  static const int build = 611;
+  static const String engine = "3.13.8";
+  static const String buildAt = "2023-10-27 20:42:26";
+  static const int modifications = 7;
   static const int script = 22;
 }

lib/data/res/rebuild.dart

@@ -4,4 +4,4 @@ class RebuildNodes {
   const RebuildNodes._();
 
   static final app = RebuildNode();
-}
+}