iOS TvCasting app: Adding async completion callback to startMatterServer API (project-chip#24285)

Author: sharadb-amazon

examples/tv-casting-app/darwin/MatterTvCastingBridge/MatterTvCastingBridge/CastingServerBridge.h

@@ -185,9 +185,15 @@
 - (void)disconnect:(dispatch_queue_t _Nonnull)clientQueue requestSentHandler:(nullable void (^)())requestSentHandler;
 
 /**
- @brief Start the Matter server and reconnect to a previously connected Video Player (if any)
+ @brief Start the Matter server and reconnect to a previously connected Video Player (if any). This API is async
+
+ @param clientQueue Queue to invoke callbacks on
+
+ @param startMatterServerCompletionCallback Called after the Matter server has started and connected (or failed to connect) to a
+ previously connected video player (if any) are complete
  */
-- (void)startMatterServer;
+- (void)startMatterServer:(dispatch_queue_t _Nonnull)clientQueue
+    startMatterServerCompletionCallback:(nullable void (^)(MatterError * _Nonnull))startMatterServerCompletionCallback;
 
 /**
  @brief Stop the Matter server

examples/tv-casting-app/darwin/MatterTvCastingBridge/MatterTvCastingBridge/CastingServerBridge.mm

@@ -510,15 +510,20 @@ - (void)shutdownAllSubscriptions:(dispatch_queue_t _Nonnull)clientQueue requestS
     });
 }
 
-- (void)startMatterServer
+- (void)startMatterServer:(dispatch_queue_t _Nonnull)clientQueue
+    startMatterServerCompletionCallback:(nullable void (^)(MatterError * _Nonnull))startMatterServerCompletionCallback
 {
     ChipLogProgress(AppServer, "CastingServerBridge().startMatterServer() called");
 
-    dispatch_sync(_chipWorkQueue, ^{
+    dispatch_async(_chipWorkQueue, ^{
         // Initialize the Matter server
         CHIP_ERROR err = chip::Server::GetInstance().Init(*self->_serverInitParams);
         if (err != CHIP_NO_ERROR) {
             ChipLogError(AppServer, "chip::Server init failed: %s", ErrorStr(err));
+            dispatch_async(clientQueue, ^{
+                startMatterServerCompletionCallback(
+                    [[MatterError alloc] initWithCode:err.AsInteger() message:[NSString stringWithUTF8String:err.AsString()]]);
+            });
             return;
         }
 
@@ -527,8 +532,28 @@ - (void)startMatterServer
             ChipLogProgress(
                 AppServer, "CastingServerBridge().startMatterServer() reconnecting to previously connected VideoPlayer...");
             err = CastingServer::GetInstance()->VerifyOrEstablishConnection(
-                *(self->_previouslyConnectedVideoPlayer), [](TargetVideoPlayerInfo * cppTargetVideoPlayerInfo) {},
-                [](CHIP_ERROR err) {}, [](TargetEndpointInfo * cppTargetEndpointInfo) {});
+                *(self->_previouslyConnectedVideoPlayer),
+                [clientQueue, startMatterServerCompletionCallback](TargetVideoPlayerInfo * cppTargetVideoPlayerInfo) {
+                    dispatch_async(clientQueue, ^{
+                        startMatterServerCompletionCallback(
+                            [[MatterError alloc] initWithCode:CHIP_NO_ERROR.AsInteger()
+                                                      message:[NSString stringWithUTF8String:CHIP_NO_ERROR.AsString()]]);
+                    });
+                },
+                [clientQueue, startMatterServerCompletionCallback](CHIP_ERROR err) {
+                    dispatch_async(clientQueue, ^{
+                        startMatterServerCompletionCallback(
+                            [[MatterError alloc] initWithCode:err.AsInteger()
+                                                      message:[NSString stringWithUTF8String:err.AsString()]]);
+                    });
+                },
+                [](TargetEndpointInfo * cppTargetEndpointInfo) {});
+        } else {
+            dispatch_async(clientQueue, ^{
+                startMatterServerCompletionCallback(
+                    [[MatterError alloc] initWithCode:CHIP_NO_ERROR.AsInteger()
+                                              message:[NSString stringWithUTF8String:CHIP_NO_ERROR.AsString()]]);
+            });
         }
     });
 }

examples/tv-casting-app/darwin/TvCasting/TvCasting/TvCastingApp.swift

@@ -64,7 +64,11 @@ struct TvCastingApp: App {
                     {
                         if let castingServerBridge = CastingServerBridge.getSharedInstance()
                         {
-                            castingServerBridge.startMatterServer()
+                            castingServerBridge.startMatterServer(DispatchQueue.main, startMatterServerCompletionCallback: { (error: MatterError) -> () in
+                                DispatchQueue.main.async {
+                                    self.Log.info("TvCastingApp.startMatterServerCompletionCallback called with \(error)")
+                                }
+                            })
                         }
                     }
                     firstAppActivation = false