dns添加

lib/hj_utils/detect_line_manager.dart

@@ -4,6 +4,9 @@ import 'dart:async';
 
 import 'package:dio/dio.dart';
 import 'package:hgdj/config/config.dart';
+import 'package:hgdj/hj_utils/dns_solve/dnsolve.dart';
+import 'package:hgdj/hj_utils/light_model.dart';
+import 'package:hgdj/hj_utils/store_keys.dart';
 import 'package:hgdj/hj_utils/text_util.dart';
 import 'package:hgdj/tools_base/debug_log.dart';
 import 'package:hgdj/tools_base/net/http_manager.dart';
@@ -36,8 +39,14 @@ class DetectLineManager {
 
   /// 一次完整的批量选线过程
   Future<String> _detectLineOnce() async {
-    //线路只来自 Config.lineList：DNS 解析兜底和本地线路缓存都已去掉
-    return await _pingCheckBatch(Config.lineList);
+    final saved = await lightKV.getStringList(StoreKeys.DETECT_LINE);
+    final lines = saved?.isNotEmpty == true ? saved! : Config.lineList;
+    var successLine = await _pingCheckBatch(lines);
+    // 本地线路全部失败，回退 DNS 解析
+    if (TextUtil.isEmpty(successLine)) {
+      successLine = await _dnsSolve();
+    }
+    return successLine;
   }
 
   ///检查一批线路：并发 ping，谁先成功用谁；全失败返回 ""
@@ -94,4 +103,35 @@ class DetectLineManager {
     }
     return resp.isSuccess;
   }
+
+  //本地域名不通的情况下，使用 dns 解析
+  Future<String> _dnsSolve() async {
+    final response = await DNSolve().lookup(
+      Config.dns,
+      dnsSec: true,
+      type: RecordType.txt,
+      provider: DNSProvider.aliyun,
+    );
+
+    //必须先取出来判空，不能写成 `?? []`：那个空字面量会被推成 List<dynamic>，
+    //整行 LUB 退化后 record 也成了 dynamic，record.data.split().map().toList()
+    //一路 dynamic 下去，运行期是 List<dynamic>，传给 setStringList(List<String>) 直接抛。
+    //全程 dynamic，analyze 一个警告都不会给
+    final records = response.answer?.records;
+    if (records == null) return '';
+    for (final record in records) {
+      if (record.data.isEmpty) continue;
+      debugLog("selectLine", "dnsSolve ==== ${record.data}");
+      //DNS TXT 值带引号，去掉后按 _ 拆成多条线路
+      final lines = record.data
+          .split('_')
+          .map((e) => e.replaceAll("\"", ""))
+          .where(TextUtil.isNotEmpty)
+          .toList();
+      if (lines.isEmpty) continue; // 这条记录没解析出线路，接着看下一条，别直接放弃
+      lightKV.setStringList(StoreKeys.DETECT_LINE, lines);
+      return await _pingCheckBatch(lines);
+    }
+    return '';
+  }
 }