All: Save size of a resource to the database; and added mechanism to run non-database migrations

ReactNativeClient/lib/services/MigrationService.js

@@ -0,0 +1,37 @@
+const BaseService = require('lib/services/BaseService');
+const Migration = require('lib/models/Migration');
+
+class MigrationService extends BaseService {
+
+	constructor() {
+		super();
+
+	}
+
+	static instance() {
+		if (this.instance_) return this.instance_;
+		this.instance_ = new MigrationService();
+		return this.instance_;
+	}
+
+	async run() {
+		const migrations = await Migration.migrationsToDo();
+
+		for (const migration of migrations) {
+			this.logger().info('Running migration: ' + migration.number);
+
+			const script = Migration.script(migration.number);
+
+			try {
+				await script.exec();
+				await Migration.delete(migration.id);
+			} catch (error) {
+				this.logger().error('Cannot run migration: ' + migration.number, error);
+				break;
+			}
+		}
+	}
+
+}
+
+module.exports = MigrationService;