feat: retry logic

Signed-off-by: Kingtous <kingtous@qq.com>

flutter/lib/desktop/pages/connection_page.dart

@@ -609,6 +609,18 @@ class _ConnectionPageState extends State<ConnectionPage> {
         builder: (context, snapshot) {
           if (snapshot.hasData) {
             return _buildAddressBook(context);
+          } else if (snapshot.hasError) {
+            return Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                Text(translate("${snapshot.error}")),
+                TextButton(
+                    onPressed: () {
+                      setState(() {});
+                    },
+                    child: Text(translate("Retry")))
+              ],
+            );
           } else {
             if (model.abLoading) {
               return Center(
@@ -616,7 +628,17 @@ class _ConnectionPageState extends State<ConnectionPage> {
               );
             } else if (model.abError.isNotEmpty) {
               return Center(
-                child: Text(translate("${model.abError}")),
+                child: Column(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
+                    Text(translate("${model.abError}")),
+                    TextButton(
+                        onPressed: () {
+                          setState(() {});
+                        },
+                        child: Text(translate("Retry")))
+                  ],
+                ),
               );
             } else {
               return Offstage();

flutter/lib/models/ab_model.dart

@@ -24,22 +24,25 @@ class AbModel with ChangeNotifier {
     notifyListeners();
     // request
     final api = "${await getApiServer()}/api/ab/get";
-    final resp = await http.post(Uri.parse(api), headers: await _getHeaders());
+    try {
-    abLoading = false;
+      final resp =
-    Map<String, dynamic> json = jsonDecode(resp.body);
+          await http.post(Uri.parse(api), headers: await _getHeaders());
-    if (json.containsKey('error')) {
+      Map<String, dynamic> json = jsonDecode(resp.body);
-      abError = json['error'];
+      if (json.containsKey('error')) {
-    } else if (json.containsKey('data')) {
+        abError = json['error'];
-      // {"tags":["aaa","bbb"],
+      } else if (json.containsKey('data')) {
-      // "peers":[{"id":"aa1234","username":"selfd",
+        final data = jsonDecode(json['data']);
-      // "hostname":"PC","platform":"Windows","tags":["aaa"]}]}
+        tags.value = data['tags'];
-      final data = jsonDecode(json['data']);
+        peers.value = data['peers'];
-      tags.value = data['tags'];
+      }
-      peers.value = data['peers'];
+      return resp.body;
+    } catch (err) {
+      abError = err.toString();
+    } finally {
+      abLoading = false;
     }
-    print(json);
     notifyListeners();
-    return resp.body;
+    return null;
   }
 
   Future<String> getApiServer() async {