Initial Flutter booru app

lib/core/database/database_service.dart

@@ -0,0 +1,32 @@
+import 'package:isar/isar.dart';
+
+import '../errors/app_exception.dart';
+import '../utils/result.dart';
+import 'app_database.dart';
+
+class DatabaseService {
+  DatabaseService(this.database);
+
+  final AppDatabase database;
+
+  Isar get isar => database.isar;
+
+  Future<Result<T>> safeRead<T>(Future<T> Function(Isar isar) action) async {
+    try {
+      return Success(await action(isar));
+    } catch (error) {
+      return Error(
+          DatabaseException(error.toString(), details: error).toFailure());
+    }
+  }
+
+  Future<Result<T>> safeWrite<T>(Future<T> Function(Isar isar) action) async {
+    try {
+      final value = await isar.writeTxn(() => action(isar));
+      return Success(value);
+    } catch (error) {
+      return Error(
+          DatabaseException(error.toString(), details: error).toFailure());
+    }
+  }
+}