client and order optimization

lib/storages/fsKeysStorage.js

@@ -0,0 +1,27 @@
+'use strict';
+
+const fs = require('fs');
+
+module.exports = (pathToFile) => {
+	const path = pathToFile;
+
+	return {
+		read() {
+			if (!fs.existsSync(path))
+				return null;
+			return fs.readFileSync(path, { encoding: 'utf8' });
+		},
+
+		write(data) {
+			fs.writeFileSync(path, data, { encoding: 'utf8' });
+			return this;
+		},
+
+		hasData() {
+			if (fs.existsSync(path))
+				return this.read() !== '';
+
+			return false;
+		},
+	};
+};