Electron-136 (Optimize memory by reloading the app when the user is idle) (#335)

- Refresh app when memory exceeds the threshold and if user is inactive
- Add logic to reload app when memory exceeds threshold and if user is inactive
- Add reload threshold
- Fix unit test

js/memoryMonitor.js

@@ -2,6 +2,14 @@
 
 const log = require('./log.js');
 const logLevels = require('./enums/logLevels.js');
+const { getMainWindow, setIsAutoReload } = require('./windowMgr');
+const systemIdleTime = require('@paulcbetts/system-idle-time');
+const { getConfigField } = require('./config');
+
+const maxMemory = 800;
+let maxIdleTime = 4 * 60 * 1000;
+let reloadThreshold = 30 * 60 * 1000;
+let reloadedTimeStamp;
 
 // once a minute
 setInterval(gatherMemory, 1000 * 60);
@@ -18,3 +26,35 @@ function gatherMemory() {
         ' sharedBytes: ' + memory.sharedBytes;
     log.send(logLevels.INFO, details);
 }
+
+/**
+ * Method that checks memory usage every minute
+ * and verify if the user in inactive if so it reloads the
+ * application to free up some memory consumption
+ * 
+ * @param memoryInfo
+ */
+function optimizeMemory(memoryInfo) {
+    const memoryConsumed = (memoryInfo && memoryInfo.workingSetSize / 1024) || 0;
+    const canReload = (!reloadedTimeStamp || (new Date().getTime() - reloadedTimeStamp) > reloadThreshold);
+
+    if (memoryConsumed > maxMemory && systemIdleTime.getIdleTime() > maxIdleTime && canReload) {
+        getConfigField('memoryRefresh')
+            .then((enabled) => {
+                if (enabled) {
+                    const mainWindow = getMainWindow();
+
+                    if (mainWindow && !mainWindow.isDestroyed()) {
+                        setIsAutoReload(true);
+                        reloadedTimeStamp = new Date().getTime();
+                        log.send(logLevels.INFO, 'Reloading the app to optimize memory usage');
+                        mainWindow.webContents.reload();
+                    }
+                }
+            });
+    }
+}
+
+module.exports = {
+    optimizeMemory
+};