Cache settings in local storage

js/fc.js

@@ -78,7 +78,6 @@ var FC = {
     MIXER_CONFIG: null,
     BATTERY_CONFIG: null,
     OUTPUT_MAPPING: null,
-    SETTINGS: null,
     BRAKING_CONFIG: null,
     SAFEHOMES: null,
     BOARD_ALIGNMENT: null,
@@ -570,8 +569,6 @@ var FC = {
 
         this.OUTPUT_MAPPING = new OutputMappingCollection();
 
-        this.SETTINGS = {};
-
         this.SAFEHOMES = new SafehomeCollection();
 
         this.RATE_DYNAMICS = {

js/msp/MSPHelper.js

@@ -20,6 +20,7 @@ const { FwApproach } = require('./../fwApproach');
 const Waypoint = require('./../waypoint');
 const mspDeduplicationQueue = require('./mspDeduplicationQueue');
 const mspStatistics = require('./mspStatistics');
+const settingsCache = require('./../settingsCache');
 
 var mspHelper = (function () {
     var self = {};
@@ -3060,9 +3061,12 @@ var mspHelper = (function () {
     };
 
     self._getSetting = function (name) {
-        if (FC.SETTINGS[name]) {
-            return Promise.resolve(FC.SETTINGS[name]);
+
+        const storedSetting = settingsCache.get(name);
+        if (typeof storedSetting !== 'undefined') {
+            return Promise.resolve(storedSetting);
         }
+
         var data = [];
         self._encodeSettingReference(name, null, data);
         return MSP.promise(MSPCodes.MSP2_COMMON_SETTING_INFO, data).then(function (result) {
@@ -3109,7 +3113,7 @@ var mspHelper = (function () {
                 }
                 setting.table = { values: values };
             }
-            FC.SETTINGS[name] = setting;
+            settingsCache.set(name, setting);
             return setting;
         });
     }

js/settingsCache.js

@@ -0,0 +1,46 @@
+'use strict';
+
+const Store = require('electron-store');
+const store = new Store();
+const FC = require('./fc');
+
+var settingsCache = (function() {
+
+    let publicScope = {};
+    let privateScope = {};
+
+    const SETTINGS_KEY = 'settings';
+
+    privateScope.getSetingKey = function(settingName) {
+        return FC.CONFIG.target + '_' + FC.CONFIG.flightControllerVersion + '_' + settingName;
+    }
+
+    publicScope.flush = function() {
+        store.delete(SETTINGS_KEY);
+    };
+
+    publicScope.get = function(settingName) {
+        let settings = store.get(SETTINGS_KEY, null);
+
+        if (settings === null) {
+            return undefined;
+        }
+        let setting = settings[privateScope.getSetingKey(settingName)];
+        return setting;
+    };
+
+    publicScope.set = function(settingName, value) {
+        let settings = store.get(SETTINGS_KEY, null);
+
+        if (settings === null) {
+            settings = {};
+        }
+
+        settings[privateScope.getSetingKey(settingName)] = value;
+        store.set(SETTINGS_KEY, settings);
+    };
+
+    return publicScope;
+}());
+
+module.exports = settingsCache;