feat(logging): enable log rotation and set retry on full log store sy…

…nc (#3699)

* feat(logging): enable log rotation and set retry

packages/logging_cloudwatch/amplify_logging_cloudwatch/lib/src/queued_item_store/dart_queued_item_store.stub.dart

@@ -42,7 +42,7 @@ class DartQueuedItemStore implements QueuedItemStore, Closeable {
   }
 
   @override
-  FutureOr<bool> isFull(int maxSizeInMB) {
+  bool isFull(int maxSizeInMB) {
     throw UnimplementedError('isFull() has not been implemented.');
   }
 

packages/logging_cloudwatch/amplify_logging_cloudwatch/lib/src/queued_item_store/dart_queued_item_store.vm.dart

@@ -56,7 +56,7 @@ class DartQueuedItemStore implements QueuedItemStore, Closeable {
   }
 
   @override
-  Future<bool> isFull(int maxSizeInMB) {
+  bool isFull(int maxSizeInMB) {
     return _database.isFull(maxSizeInMB);
   }
 

packages/logging_cloudwatch/amplify_logging_cloudwatch/lib/src/queued_item_store/dart_queued_item_store.web.dart

@@ -14,8 +14,8 @@ class DartQueuedItemStore
   // ignore: avoid_unused_constructor_parameters
   DartQueuedItemStore(String? storagePath);
 
-  late final Future<QueuedItemStore> _database = () async {
-    if (await IndexedDbAdapter.checkIsIndexedDBSupported()) {
+  late final QueuedItemStore _database = () {
+    if (IndexedDbAdapter.checkIsIndexedDBSupported()) {
       return IndexedDbAdapter();
     }
     logger.warn(
@@ -34,8 +34,7 @@ class DartQueuedItemStore
     String timestamp, {
     bool enableQueueRotation = false,
   }) async {
-    final db = await _database;
-    await db.addItem(
+    await _database.addItem(
       string,
       timestamp,
       enableQueueRotation: enableQueueRotation,
@@ -44,34 +43,29 @@ class DartQueuedItemStore
 
   @override
   Future<void> deleteItems(Iterable<QueuedItem> items) async {
-    final db = await _database;
-    await db.deleteItems(items);
+    await _database.deleteItems(items);
   }
 
   @override
   Future<Iterable<QueuedItem>> getCount(int count) async {
-    final db = await _database;
-    return db.getCount(count);
+    return _database.getCount(count);
   }
 
   @override
   Future<Iterable<QueuedItem>> getAll() async {
-    final db = await _database;
-    return db.getAll();
+    return _database.getAll();
   }
 
   @override
-  Future<bool> isFull(int maxSizeInMB) async {
-    final db = await _database;
-    return db.isFull(maxSizeInMB);
+  bool isFull(int maxSizeInMB) {
+    return _database.isFull(maxSizeInMB);
   }
 
   /// Clear IndexedDB data.
   @override
   @visibleForTesting
   Future<void> clear() async {
-    final db = await _database;
-    return db.clear();
+    return _database.clear();
   }
 
   @override

packages/logging_cloudwatch/amplify_logging_cloudwatch/lib/src/queued_item_store/drift/drift_queued_item_store.dart

@@ -104,7 +104,7 @@ class DriftQueuedItemStore extends _$DriftQueuedItemStore
   }
 
   @override
-  Future<bool> isFull(int maxSizeInMB) async {
+  bool isFull(int maxSizeInMB) {
     final maxBytes = maxSizeInMB * 1024 * 1024;
     return _currentTotalByteSize >= maxBytes;
   }

packages/logging_cloudwatch/amplify_logging_cloudwatch/lib/src/queued_item_store/index_db/indexed_db_adapter.dart

@@ -150,7 +150,7 @@ class IndexedDbAdapter implements QueuedItemStore {
   }
 
   @override
-  Future<bool> isFull(int maxSizeInMB) async {
+  bool isFull(int maxSizeInMB) {
     final maxBytes = maxSizeInMB * 1024 * 1024;
     return _currentTotalByteSize >= maxBytes;
   }
@@ -167,15 +167,14 @@ class IndexedDbAdapter implements QueuedItemStore {
   void close() {}
 
   /// Check that IndexDB will work on this device.
-  static Future<bool> checkIsIndexedDBSupported() async {
+  static bool checkIsIndexedDBSupported() {
     if (indexedDB == null) {
       return false;
     }
     // indexedDB will be non-null in Firefox private browsing,
     // but will fail to open.
     try {
-      final openRequest = indexedDB!.open('test', 1);
-      await openRequest.future;
+      indexedDB!.open('test', 1).result;
       return true;
     } on Object {
       return false;

packages/logging_cloudwatch/amplify_logging_cloudwatch/test/queued_item_store_test.dart

@@ -233,14 +233,14 @@ void main() {
           await db.addItem(largeItem, DateTime.now().toIso8601String());
         }
 
-        var result = await db.isFull(capacityLimit);
+        var result = db.isFull(capacityLimit);
         expect(result, isFalse);
 
         for (var i = 0; i < 100; i++) {
           await db.addItem(largeItem, DateTime.now().toIso8601String());
         }
 
-        result = await db.isFull(capacityLimit);
+        result = db.isFull(capacityLimit);
         expect(result, isTrue);
       },
     );

packages/logging_cloudwatch/aws_logging_cloudwatch/lib/src/cloudwatch_logger_plugin.dart

@@ -32,9 +32,10 @@ import 'package:meta/meta.dart';
 const int _maxNumberOfLogEventsInBatch = 10000;
 const int _maxLogEventsBatchSize = 1048576;
 const int _baseBufferSize = 26;
+const int _maxLogEventsTimeSpanInBatch = Duration.millisecondsPerDay;
 const int _maxLogEventSize = 256000;
-final int _maxLogEventsTimeSpanInBatch =
-    const Duration(hours: 24).inMilliseconds;
+const Duration _minusMaxLogEventTimeInFuture = Duration(hours: -2);
+const Duration _baseRetryInterval = Duration(seconds: 10);
 
 typedef _LogBatch = (List<QueuedItem> logQueues, List<InputLogEvent> logEvents);
 
@@ -113,7 +114,8 @@ class CloudWatchLoggerPlugin extends AWSLoggerPlugin
   bool _enabled;
   StoppableTimer? _timer;
   RemoteLoggingConstraintProvider? _remoteLoggingConstraintProvider;
-
+  int _retryCount = 0;
+  DateTime? _retryTime;
   set remoteLoggingConstraintProvider(
     RemoteLoggingConstraintProvider remoteProvider,
   ) {
@@ -129,32 +131,89 @@ class CloudWatchLoggerPlugin extends AWSLoggerPlugin
     Future<void> startSyncing() async {
       final batchStream = _getLogBatchesToSync();
       await for (final (logs, events) in batchStream) {
-        final response = await _sendToCloudWatch(events);
-        // TODO(nikahsn): handle tooOldLogEventEndIndex
-        // and expiredLogEventEndIndex.
-        if (response.rejectedLogEventsInfo?.tooNewLogEventStartIndex != null) {
-          // TODO(nikahsn): throw and exception to enable log rotation if the
-          // log store is full.
-          break;
+        _TooNewLogEventException? tooNewException;
+        while (logs.isNotEmpty && events.isNotEmpty) {
+          final rejectedLogEventsInfo =
+              (await _sendToCloudWatch(events)).rejectedLogEventsInfo;
+          if (rejectedLogEventsInfo == null) {
+            await _logStore.deleteItems(logs);
+            break;
+          }
+
+          final (tooOldEndIndex, tooNewStartIndex) =
+              rejectedLogEventsInfo.parse(events.length);
+
+          if (_isValidIndex(tooNewStartIndex, events.length)) {
+            tooNewException = _TooNewLogEventException(
+              events[tooNewStartIndex!].timestamp.toInt(),
+            );
+            // set logs to end before the index.
+            logs.removeRange(tooNewStartIndex, events.length);
+            // set events to end before the index.
+            events.removeRange(tooNewStartIndex, events.length);
+          }
+          if (_isValidIndex(tooOldEndIndex, events.length)) {
+            // remove old logs from log store.
+            await _logStore.deleteItems(logs.sublist(0, tooOldEndIndex! + 1));
+            // set logs to start after the index.
+            logs.removeRange(0, tooOldEndIndex + 1);
+            // set events to start after the index.
+            events.removeRange(0, tooOldEndIndex + 1);
+          }
+        }
+        // after sending each batch to CloudWatch check if the batch has
+        // `tooNewException` and throw to stop syncing next batches.
+        if (tooNewException != null) {
+          throw tooNewException;
         }
-        await _logStore.deleteItems(logs);
       }
     }
 
     if (!_syncing) {
-      // TODO(nikahsn): disable log rotation.
       _syncing = true;
+      DateTime? nextRetry;
       try {
         await startSyncing();
+      } on _TooNewLogEventException catch (e) {
+        nextRetry =
+            DateTime.fromMillisecondsSinceEpoch(e.timeInMillisecondsSinceEpoch)
+                .add(_minusMaxLogEventTimeInFuture);
       } on Exception catch (e) {
         logger.error('Failed to sync logs to CloudWatch.', e);
-        // TODO(nikahsn): enable log rotation if the log store is full
       } finally {
+        _handleFullLogStoreAfterSync(
+          retryTime: nextRetry,
+        );
         _syncing = false;
       }
     }
   }
 
+  void _handleFullLogStoreAfterSync({
+    DateTime? retryTime,
+  }) {
+    final isLogStoreFull =
+        _logStore.isFull(_pluginConfig.localStoreMaxSizeInMB);
+    if (!isLogStoreFull) {
+      _retryCount = 0;
+      _retryTime = null;
+      return;
+    }
+    if (retryTime != null && retryTime.isAfter(DateTime.timestamp())) {
+      _retryTime = retryTime;
+      return;
+    }
+    _retryCount += 1;
+    _retryTime = DateTime.timestamp().add((_baseRetryInterval * _retryCount));
+  }
+
+  bool _shouldSyncOnFullLogStore() {
+    if (_retryTime == null) {
+      return true;
+    }
+    return !(_retryTime!.isAfter(DateTime.timestamp()));
+  }
+
   void _onTimerError(Object e) {
     logger.error('Failed to sync logs to CloudWatch.', e);
   }
@@ -225,11 +284,17 @@ class CloudWatchLoggerPlugin extends AWSLoggerPlugin
       return;
     }
     final item = logEntry.toQueuedItem();
+    final isLogStoreFull =
+        _logStore.isFull(_pluginConfig.localStoreMaxSizeInMB);
+    final shouldEnableQueueRotation = isLogStoreFull && _retryTime != null;
+
     await _logStore.addItem(
       item.value,
       item.timestamp,
+      enableQueueRotation: shouldEnableQueueRotation,
     );
-    if (await _logStore.isFull(_pluginConfig.localStoreMaxSizeInMB)) {
+
+    if (isLogStoreFull && _shouldSyncOnFullLogStore()) {
       await _startSyncingIfNotInProgress();
     }
   }
@@ -253,6 +318,8 @@ class CloudWatchLoggerPlugin extends AWSLoggerPlugin
     _enabled = false;
     _timer?.stop();
     await _logStore.clear();
+    _retryCount = 0;
+    _retryTime = null;
   }
 
   /// Sends logs on-demand to CloudWatch.
@@ -285,3 +352,34 @@ extension on LogEntry {
     );
   }
 }
+
+extension on RejectedLogEventsInfo {
+  (int? pastEndIndex, int? futureStartIndex) parse(int length) {
+    int? pastEndIndex;
+    int? futureStartIndex;
+
+    if (_isValidIndex(tooOldLogEventEndIndex, length)) {
+      pastEndIndex = tooOldLogEventEndIndex;
+    }
+    if (_isValidIndex(expiredLogEventEndIndex, length)) {
+      pastEndIndex = pastEndIndex == null
+          ? expiredLogEventEndIndex
+          : max(pastEndIndex, expiredLogEventEndIndex!);
+    }
+    if (_isValidIndex(tooNewLogEventStartIndex, length)) {
+      futureStartIndex = tooNewLogEventStartIndex;
+    }
+    return (pastEndIndex, futureStartIndex);
+  }
+}
+
+class _TooNewLogEventException implements Exception {
+  const _TooNewLogEventException(
+    this.timeInMillisecondsSinceEpoch,
+  );
+  final int timeInMillisecondsSinceEpoch;
+}
+
+bool _isValidIndex(int? index, int length) {
+  return index != null && index >= 0 && index <= length - 1;
+}

packages/logging_cloudwatch/aws_logging_cloudwatch/lib/src/queued_item_store/queued_item_store.dart

@@ -24,7 +24,7 @@ abstract interface class QueuedItemStore {
   FutureOr<Iterable<QueuedItem>> getAll();
 
   /// Whether the queue size is reached [maxSizeInMB].
-  FutureOr<bool> isFull(int maxSizeInMB);
+  bool isFull(int maxSizeInMB);
 
   /// Clear the queue of items.
   FutureOr<void> clear();