⚡ Optimize loading speed of chat

✨ Support new subscribe channel

api/Nexus/Check Status.bru

@@ -0,0 +1,11 @@
+meta {
+  name: Check Status
+  type: http
+  seq: 1
+}
+
+get {
+  url: {{endpoint}}/directory/status
+  body: none
+  auth: none
+}

api/Nexus/List Services.bru

@@ -0,0 +1,11 @@
+meta {
+  name: List Services
+  type: http
+  seq: 2
+}
+
+get {
+  url: {{endpoint}}/directory/services
+  body: none
+  auth: none
+}

lib/controllers/chat_message_controller.dart

@@ -38,6 +38,7 @@ class ChatMessageController extends ChangeNotifier {
 
   bool isPending = true;
   bool isLoading = false;
+  bool isAggressiveLoading = false;
 
   int? messageTotal;
 
@@ -320,7 +321,7 @@ class ChatMessageController extends ChangeNotifier {
   /// Check the local storage is up to date with the server.
   /// If the local storage is not up to date, it will be updated.
   Future<void> checkUpdate() async {
-    isLoading = true;
+    isAggressiveLoading = true;
     notifyListeners();
 
     final mostRecentMessage = await (_dt.db.snLocalChatMessage.select()
@@ -357,7 +358,7 @@ class ChatMessageController extends ChangeNotifier {
       rethrow;
     } finally {
       await loadMessages();
-      isLoading = false;
+      isAggressiveLoading = false;
 
       isCheckedUpdate = true;
       _saveMessageToLocal(incomeStrandedQueue).then((_) {

lib/providers/websocket.dart

@@ -39,7 +39,7 @@ class WebSocketProvider extends ChangeNotifier {
   Future<void> connect({noRetry = false}) async {
     if (_connectCompleter != null) {
       await _connectCompleter!.future;
-      _connectCompleter = null;
+      return;
     }
 
     if (!_ua.isAuthorized) return;

lib/screens/chat/room.dart

@@ -89,6 +89,12 @@ class _ChatRoomScreenState extends State<ChatRoomScreen> {
       if (!mounted) return;
       final nty = context.read<NotificationProvider>();
       nty.skippableNotifyChannel = _channel!.id;
+      final ws = context.read<WebSocketProvider>();
+      if (_channel != null) {
+        ws.conn?.sink.add({
+          'channel_id': _channel?.id,
+        });
+      }
     } catch (err) {
       if (!mounted) return;
       context.showErrorDialog(err);
@@ -239,6 +245,12 @@ class _ChatRoomScreenState extends State<ChatRoomScreen> {
     _messageController.dispose();
     final nty = context.read<NotificationProvider>();
     nty.skippableNotifyChannel = null;
+    final ws = context.read<WebSocketProvider>();
+    if (_channel != null) {
+      ws.conn?.sink.add({
+        'channel_id': _channel?.id,
+      });
+    }
     super.dispose();
   }
 
@@ -289,7 +301,9 @@ class _ChatRoomScreenState extends State<ChatRoomScreen> {
         builder: (context, _) {
           return Column(
             children: [
-              LoadingIndicator(isActive: _isBusy),
+              LoadingIndicator(
+                isActive: _isBusy || _messageController.isAggressiveLoading,
+              ),
               SingleChildScrollView(
                 physics: const NeverScrollableScrollPhysics(),
                 child: MaterialBanner(
@@ -315,8 +329,8 @@ class _ChatRoomScreenState extends State<ChatRoomScreen> {
               if (_messageController.isPending)
                 Expanded(
                   child: const CircularProgressIndicator().center(),
-                ),
-              if (!_messageController.isPending)
+                )
+              else
                 Expanded(
                   child: InfiniteList(
                     reverse: true,