feat: support metadata update. (#259)

lib/src/core/signal_client.dart

@@ -381,6 +381,12 @@ extension SignalClientRequests on SignalClient {
     ));
   }
 
+  @internal
+  void sendUpdateLocalMetadata(lk_rtc.UpdateParticipantMetadata metadata) =>
+      _sendRequest(lk_rtc.SignalRequest(
+        updateMetadata: metadata,
+      ));
+
   @internal
   void sendUpdateTrackSettings(lk_rtc.UpdateTrackSettings settings) =>
       _sendRequest(lk_rtc.SignalRequest(

lib/src/events.dart

@@ -411,3 +411,16 @@ class ParticipantPermissionsUpdatedEvent with RoomEvent, ParticipantEvent {
   String toString() => '${runtimeType}'
       '(participant: ${participant}, permissions: ${permissions})';
 }
+
+class ParticipantNameUpdatedEvent with RoomEvent, ParticipantEvent {
+  final Participant participant;
+  final String name;
+  const ParticipantNameUpdatedEvent({
+    required this.participant,
+    required this.name,
+  });
+
+  @override
+  String toString() => '${runtimeType}'
+      '(participant: ${participant}, name: ${name})';
+}

lib/src/participant/local.dart

@@ -276,6 +276,29 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
     await room.engine.sendDataPacket(packet);
   }
 
+  /// Sets and updates the metadata of the local participant.
+  /// Note: this requires `CanUpdateOwnMetadata` permission encoded in the token.
+  /// @param metadata
+  void setMetadata(String metadata) {
+    room.engine.signalClient
+        .sendUpdateLocalMetadata(lk_rtc.UpdateParticipantMetadata(
+      name: name,
+      metadata: metadata,
+    ));
+  }
+
+  /// Sets and updates the name of the local participant.
+  ///  Note: this requires `CanUpdateOwnMetadata` permission encoded in the token.
+  ///  @param name
+  void setName(String name) {
+    super.updateName(name);
+    room.engine.signalClient
+        .sendUpdateLocalMetadata(lk_rtc.UpdateParticipantMetadata(
+      name: name,
+      metadata: metadata,
+    ));
+  }
+
   /// A convenience property to get all video tracks.
   @override
   List<LocalTrackPublication<LocalVideoTrack>> get videoTracks =>

lib/src/participant/participant.dart

@@ -159,8 +159,8 @@ abstract class Participant<T extends TrackPublication>
   @internal
   void updateFromInfo(lk_models.ParticipantInfo info) {
     identity = info.identity;
-    _name = info.name;
     sid = info.sid;
+    updateName(info.name);
     if (info.metadata.isNotEmpty) {
       _setMetadata(info.metadata);
     }
@@ -177,6 +177,16 @@ abstract class Participant<T extends TrackPublication>
     return oldValue;
   }
 
+  @internal
+  void updateName(String name) {
+    if (_name == name) return;
+    _name = name;
+    [events, room.events].emit(ParticipantNameUpdatedEvent(
+      participant: this,
+      name: name,
+    ));
+  }
+
   /// for internal use
   /// {@nodoc}
   @internal