Improved performance of /api/getFactorioLocale with caching

lib/getFactorioLocale.js

@@ -6,6 +6,8 @@ Module for grabbing factorio locale from a local factorio install
 const fs = require("fs");
 const ini = require("ini");
 
+const cache = {};
+
 /**
 Gets raw factorio locale from the .ini file.
 Not available outside of module through exports.
@@ -32,14 +34,20 @@ Gets factorios locale as an object, does not respect mods.
 */
 module.exports.asObject = function getLocaleAsObject(factorioDirectory, languageCode, callback){
 	if(typeof factorioDirectory != "string" || typeof languageCode != "string" || typeof callback != "function"){
-		throw "Error: wrong parameters provided";
+		throw new Error("Error: wrong parameters provided");
+	}
+	
+	if(!cache[languageCode]){
+		getLocale(factorioDirectory, languageCode, (err, rawLocale) => {
+			if(err){
+				callback(err);
+			} else {
+				let processedLocale = ini.parse(rawLocale);
+				cache[languageCode] = processedLocale;
+				callback(undefined, processedLocale);
+			}
+		});
+	} else {
+		callback(undefined, cache[languageCode]);
 	}
-	getLocale(factorioDirectory, languageCode, (err, rawLocale) => {
-		if(err){
-			callback(err);
-		} else {
-			let processedLocale = ini.parse(rawLocale)
-			callback(undefined, processedLocale);
-		}
-	});
 }

master.js

@@ -782,7 +782,7 @@ Requires x-access-token header to be set. Find you api token in secret-api-token
 @memberof clusterioMaster
 @instance
 @alias api/runCommand
-@param {object} JSON {instanceID:19412312, command:"/c game.print('hello')"}
+@param {object} JSON {instanceID:19412312, broadcast:false, command:"/c game.print('hello')"}
 @returns {object} Status {auth: bool, message: "Informative error", data:{}}
 */
 app.post("/api/runCommand", (req,res) => {