Improve reconnect logic for websocket (#406)

* Capture possible exceptions when closing the room at any time and the internal process is busy.

* fix.

* imporve reconnect logic.

* fix canReconnect logic on SignalLeaveEvent.

* Monitor Connectivity changes and automatically reconnect.

* update.

* Improve PCs reconnection speed.

* support Manual subscription.

* update.

* simple grid view for test.

* update pubspec.

* Fixed handleParticipantDisconnect not emitting for existing partcicpant.

* Trigger full Reconnect when peerConnection Failed.

* update grid view.

* add checkIfDesposed.

* update.

* remove checkIfDisposed.

* fixed rendering exception.

* update.

* update.

* fix flutter analyze.

* fix reconnect test.

* update.

* update.

* revert changes for example app.

* update.

* Refactored reconnect logic to support connectivity/network change checking.

* update.

* update.

* cleanup.

* cleanup.

* sendLeave for room.disconnect.

* fix for web.

* fix for web.

* dart run import_sorter:main.

* update.

* fix.

example/lib/exts.dart

@@ -208,12 +208,14 @@ extension LKExampleExt on BuildContext {
 
 enum SimulateScenarioResult {
   signalReconnect,
+  fullReconnect,
+  speakerUpdate,
   nodeFailure,
   migration,
   serverLeave,
   switchCandidate,
-  clear,
   e2eeKeyRatchet,
   participantName,
   participantMetadata,
+  clear,
 }

example/lib/pages/room.dart

@@ -96,6 +96,8 @@ class _RoomPageState extends State<RoomPage> {
     })
     ..on<LocalTrackPublishedEvent>((_) => _sortParticipants())
     ..on<LocalTrackUnpublishedEvent>((_) => _sortParticipants())
+    ..on<TrackSubscribedEvent>((_) => _sortParticipants())
+    ..on<TrackUnsubscribedEvent>((_) => _sortParticipants())
     ..on<TrackE2EEStateEvent>(_onE2EEStateEvent)
     ..on<ParticipantNameUpdatedEvent>((event) {
       print(

example/lib/widgets/controls.dart

@@ -250,8 +250,12 @@ class _ControlsWidgetState extends State<ControlsWidget> {
       }
 
       await widget.room.sendSimulateScenario(
+        speakerUpdate:
+            result == SimulateScenarioResult.speakerUpdate ? 3 : null,
         signalReconnect:
             result == SimulateScenarioResult.signalReconnect ? true : null,
+        fullReconnect:
+            result == SimulateScenarioResult.fullReconnect ? true : null,
         nodeFailure: result == SimulateScenarioResult.nodeFailure ? true : null,
         migration: result == SimulateScenarioResult.migration ? true : null,
         serverLeave: result == SimulateScenarioResult.serverLeave ? true : null,

example/pubspec.yaml

@@ -21,12 +21,10 @@ dependencies:
   flutter_svg: ^2.0.5
   dropdown_button2: ^2.3.6
   flutter_window_close: ^0.2.2
+  collection: '>=1.16.0'
 
   livekit_client:
     path: ../
-    # git:
-    #   url: https://github.com/livekit/client-sdk-flutter
-    #   ref: main
 
 dev_dependencies:
   flutter_test: