fix: limit each android background run to 20 mins

mobile/android/app/src/main/kotlin/app/alextran/immich/background/BackgroundEngineLock.kt

@@ -43,8 +43,8 @@ class BackgroundEngineLock(context: Context) : BackgroundWorkerLockApi, ImmichPl
 
   override fun onAttachedToEngine(binding: FlutterPlugin.FlutterPluginBinding) {
     super.onAttachedToEngine(binding)
-    checkAndEnforceBackgroundLock(binding.applicationContext)
     engineCount.incrementAndGet()
+    checkAndEnforceBackgroundLock(binding.applicationContext)
     Log.i(TAG, "Flutter engine attached. Attached Engines count: $engineCount")
   }
 

mobile/android/app/src/main/kotlin/app/alextran/immich/background/BackgroundWorker.g.kt

@@ -295,12 +295,12 @@ class BackgroundWorkerFlutterApi(private val binaryMessenger: BinaryMessenger, p
       } 
     }
   }
-  fun onAndroidUpload(callback: (Result<Unit>) -> Unit)
+  fun onAndroidUpload(maxMinutesArg: Long?, callback: (Result<Unit>) -> Unit)
 {
     val separatedMessageChannelSuffix = if (messageChannelSuffix.isNotEmpty()) ".$messageChannelSuffix" else ""
     val channelName = "dev.flutter.pigeon.immich_mobile.BackgroundWorkerFlutterApi.onAndroidUpload$separatedMessageChannelSuffix"
     val channel = BasicMessageChannel<Any?>(binaryMessenger, channelName, codec)
-    channel.send(null) {
+    channel.send(listOf(maxMinutesArg)) {
       if (it is List<*>) {
         if (it.size > 1) {
           callback(Result.failure(FlutterError(it[0] as String, it[1] as String, it[2] as String?)))

mobile/android/app/src/main/kotlin/app/alextran/immich/background/BackgroundWorker.kt

@@ -107,7 +107,7 @@ class BackgroundWorker(context: Context, params: WorkerParameters) :
    * This method acts as a bridge between the native Android background task system and Flutter.
    */
   override fun onInitialized() {
-    flutterApi?.onAndroidUpload { handleHostResult(it) }
+    flutterApi?.onAndroidUpload(maxMinutesArg = 20) { handleHostResult(it) }
   }
 
   // TODO: Move this to a separate NotificationManager class

mobile/android/app/src/main/kotlin/app/alextran/immich/background/BackgroundWorkerApiImpl.kt

@@ -5,8 +5,10 @@ import android.provider.MediaStore
 import android.util.Log
 import androidx.work.BackoffPolicy
 import androidx.work.Constraints
+import androidx.work.ExistingPeriodicWorkPolicy
 import androidx.work.ExistingWorkPolicy
-import androidx.work.OneTimeWorkRequest
+import androidx.work.OneTimeWorkRequestBuilder
+import androidx.work.PeriodicWorkRequestBuilder
 import androidx.work.WorkManager
 import io.flutter.embedding.engine.FlutterEngineCache
 import java.util.concurrent.TimeUnit
@@ -18,6 +20,7 @@ class BackgroundWorkerApiImpl(context: Context) : BackgroundWorkerFgHostApi {
 
   override fun enable() {
     enqueueMediaObserver(ctx)
+    enqueuePeriodicWorker(ctx)
   }
 
   override fun saveNotificationMessage(title: String, body: String) {
@@ -27,12 +30,14 @@ class BackgroundWorkerApiImpl(context: Context) : BackgroundWorkerFgHostApi {
   override fun configure(settings: BackgroundWorkerSettings) {
     BackgroundWorkerPreferences(ctx).updateSettings(settings)
     enqueueMediaObserver(ctx)
+    enqueuePeriodicWorker(ctx)
   }
 
   override fun disable() {
     WorkManager.getInstance(ctx).apply {
       cancelUniqueWork(OBSERVER_WORKER_NAME)
       cancelUniqueWork(BACKGROUND_WORKER_NAME)
+      cancelUniqueWork(PERIODIC_WORKER_NAME)
     }
     Log.i(TAG, "Cancelled background upload tasks")
   }
@@ -40,6 +45,7 @@ class BackgroundWorkerApiImpl(context: Context) : BackgroundWorkerFgHostApi {
   companion object {
     private const val BACKGROUND_WORKER_NAME = "immich/BackgroundWorkerV1"
     private const val OBSERVER_WORKER_NAME = "immich/MediaObserverV1"
+    private const val PERIODIC_WORKER_NAME = "immich/PeriodicBackgroundWorkerV1"
     const val ENGINE_CACHE_KEY = "immich::background_worker::engine"
 
 
@@ -55,7 +61,7 @@ class BackgroundWorkerApiImpl(context: Context) : BackgroundWorkerFgHostApi {
         setRequiresCharging(settings.requiresCharging)
       }.build()
 
-      val work = OneTimeWorkRequest.Builder(MediaObserver::class.java)
+      val work = OneTimeWorkRequestBuilder<MediaObserver>()
         .setConstraints(constraints)
         .build()
       WorkManager.getInstance(ctx)
@@ -67,10 +73,30 @@ class BackgroundWorkerApiImpl(context: Context) : BackgroundWorkerFgHostApi {
       )
     }
 
+    fun enqueuePeriodicWorker(ctx: Context) {
+      val settings = BackgroundWorkerPreferences(ctx).getSettings()
+      val constraints = Constraints.Builder().apply {
+        setRequiresCharging(settings.requiresCharging)
+      }.build()
+
+      val work =
+        PeriodicWorkRequestBuilder<PeriodicWorker>(
+          1,
+          TimeUnit.HOURS,
+          15,
+          TimeUnit.MINUTES
+        ).setConstraints(constraints)
+          .build()
+
+      WorkManager.getInstance(ctx)
+        .enqueueUniquePeriodicWork(PERIODIC_WORKER_NAME, ExistingPeriodicWorkPolicy.UPDATE, work)
+
+      Log.i(TAG, "Enqueued periodic background worker with name: $PERIODIC_WORKER_NAME")
+    }
+
     fun enqueueBackgroundWorker(ctx: Context) {
       val constraints = Constraints.Builder().setRequiresBatteryNotLow(true).build()
-
-      val work = OneTimeWorkRequest.Builder(BackgroundWorker::class.java)
+      val work = OneTimeWorkRequestBuilder<BackgroundWorker>()
         .setConstraints(constraints)
         .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 1, TimeUnit.MINUTES)
         .build()

mobile/android/app/src/main/kotlin/app/alextran/immich/background/PeriodicWorker.kt

@@ -0,0 +1,16 @@
+package app.alextran.immich.background
+
+import android.content.Context
+import android.util.Log
+import androidx.work.Worker
+import androidx.work.WorkerParameters
+
+class PeriodicWorker(context: Context, params: WorkerParameters) : Worker(context, params) {
+  private val ctx: Context = context.applicationContext
+
+  override fun doWork(): Result {
+    Log.i("PeriodicWorker", "Periodic worker triggered, starting background worker")
+    BackgroundWorkerApiImpl.enqueueBackgroundWorker(ctx)
+    return Result.success()
+  }
+}

mobile/ios/Runner/Background/BackgroundWorker.g.swift

@@ -295,7 +295,7 @@ class BackgroundWorkerBgHostApiSetup {
 /// Generated protocol from Pigeon that represents Flutter messages that can be called from Swift.
 protocol BackgroundWorkerFlutterApiProtocol {
   func onIosUpload(isRefresh isRefreshArg: Bool, maxSeconds maxSecondsArg: Int64?, completion: @escaping (Result<Void, PigeonError>) -> Void)
-  func onAndroidUpload(completion: @escaping (Result<Void, PigeonError>) -> Void)
+  func onAndroidUpload(maxMinutes maxMinutesArg: Int64?, completion: @escaping (Result<Void, PigeonError>) -> Void)
   func cancel(completion: @escaping (Result<Void, PigeonError>) -> Void)
 }
 class BackgroundWorkerFlutterApi: BackgroundWorkerFlutterApiProtocol {
@@ -326,10 +326,10 @@ class BackgroundWorkerFlutterApi: BackgroundWorkerFlutterApiProtocol {
       }
     }
   }
-  func onAndroidUpload(completion: @escaping (Result<Void, PigeonError>) -> Void) {
+  func onAndroidUpload(maxMinutes maxMinutesArg: Int64?, completion: @escaping (Result<Void, PigeonError>) -> Void) {
     let channelName: String = "dev.flutter.pigeon.immich_mobile.BackgroundWorkerFlutterApi.onAndroidUpload\(messageChannelSuffix)"
     let channel = FlutterBasicMessageChannel(name: channelName, binaryMessenger: binaryMessenger, codec: codec)
-    channel.sendMessage(nil) { response in
+    channel.sendMessage([maxMinutesArg] as [Any?]) { response in
       guard let listResponse = response as? [Any?] else {
         completion(.failure(createConnectionError(withChannelName: channelName)))
         return

mobile/lib/domain/services/background_worker.service.dart

@@ -122,46 +122,54 @@ class BackgroundWorkerBgService extends BackgroundWorkerFlutterApi {
   }
 
   @override
-  Future<void> onAndroidUpload() async {
-    _logger.info('Android background processing started');
-    final sw = Stopwatch()..start();
-    try {
-      if (!await _syncAssets(hashTimeout: Duration(minutes: _isBackupEnabled ? 3 : 6))) {
-        _logger.warning("Remote sync did not complete successfully, skipping backup");
-        return;
-      }
-      await _handleBackup();
-    } catch (error, stack) {
-      _logger.severe("Failed to complete Android background processing", error, stack);
-    } finally {
-      sw.stop();
-      _logger.info("Android background processing completed in ${sw.elapsed.inSeconds}s");
-      await _cleanup();
-    }
+  Future<void> onAndroidUpload(int? maxMinutes) async {
+    final hashTimeout = Duration(minutes: _isBackupEnabled ? 3 : 6);
+    final backupTimeout = maxMinutes != null ? Duration(minutes: maxMinutes - 1) : null;
+    return _backgroundLoop(
+      hashTimeout: hashTimeout,
+      backupTimeout: backupTimeout,
+      debugLabel: 'Android background upload',
+    );
   }
 
   @override
   Future<void> onIosUpload(bool isRefresh, int? maxSeconds) async {
-    _logger.info('iOS background upload started with maxSeconds: ${maxSeconds}s');
+    final hashTimeout = isRefresh ? const Duration(seconds: 5) : Duration(minutes: _isBackupEnabled ? 3 : 6);
+    final backupTimeout = maxSeconds != null ? Duration(seconds: maxSeconds - 1) : null;
+    return _backgroundLoop(hashTimeout: hashTimeout, backupTimeout: backupTimeout, debugLabel: 'iOS background upload');
+  }
+
+  Future<void> _backgroundLoop({
+    required Duration hashTimeout,
+    required Duration? backupTimeout,
+    required String debugLabel,
+  }) async {
+    _logger.info(
+      '$debugLabel started hashTimeout: ${hashTimeout.inSeconds}s, backupTimeout: ${backupTimeout?.inMinutes ?? '~'}m',
+    );
     final sw = Stopwatch()..start();
     try {
-      final timeout = isRefresh ? const Duration(seconds: 5) : Duration(minutes: _isBackupEnabled ? 3 : 6);
-      if (!await _syncAssets(hashTimeout: timeout)) {
+      if (!await _syncAssets(hashTimeout: hashTimeout)) {
         _logger.warning("Remote sync did not complete successfully, skipping backup");
         return;
       }
 
       final backupFuture = _handleBackup();
-      if (maxSeconds != null) {
-        await backupFuture.timeout(Duration(seconds: maxSeconds - 1), onTimeout: () {});
+      if (backupTimeout != null) {
+        await backupFuture.timeout(
+          backupTimeout,
+          onTimeout: () {
+            _cancellationToken.cancel();
+          },
+        );
       } else {
         await backupFuture;
       }
     } catch (error, stack) {
-      _logger.severe("Failed to complete iOS background upload", error, stack);
+      _logger.severe("Failed to complete $debugLabel", error, stack);
     } finally {
       sw.stop();
-      _logger.info("iOS background upload completed in ${sw.elapsed.inSeconds}s");
+      _logger.info("$debugLabel completed in ${sw.elapsed.inSeconds}s");
       await _cleanup();
     }
   }

mobile/lib/platform/background_worker_api.g.dart

@@ -273,7 +273,7 @@ abstract class BackgroundWorkerFlutterApi {
 
   Future<void> onIosUpload(bool isRefresh, int? maxSeconds);
 
-  Future<void> onAndroidUpload();
+  Future<void> onAndroidUpload(int? maxMinutes);
 
   Future<void> cancel();
 
@@ -327,8 +327,14 @@ abstract class BackgroundWorkerFlutterApi {
         pigeonVar_channel.setMessageHandler(null);
       } else {
         pigeonVar_channel.setMessageHandler((Object? message) async {
+          assert(
+            message != null,
+            'Argument for dev.flutter.pigeon.immich_mobile.BackgroundWorkerFlutterApi.onAndroidUpload was null.',
+          );
+          final List<Object?> args = (message as List<Object?>?)!;
+          final int? arg_maxMinutes = (args[0] as int?);
           try {
-            await api.onAndroidUpload();
+            await api.onAndroidUpload(arg_maxMinutes);
             return wrapResponse(empty: true);
           } on PlatformException catch (e) {
             return wrapResponse(error: e);

mobile/pigeon/background_worker_api.dart

@@ -47,7 +47,7 @@ abstract class BackgroundWorkerFlutterApi {
 
   // Android Only: Called when the Android background upload is triggered
   @async
-  void onAndroidUpload();
+  void onAndroidUpload(int? maxMinutes);
 
   @async
   void cancel();