updater.js

const {dialog, BrowserWindow, ipcMain} = require('electron');
const {autoUpdater} = require('electron-updater');

const path = require('path');
const url = require('url');
const log = require('electron-log');

log.transports.file.level = 'info';
autoUpdater.logger = log;

autoUpdater.autoDownload = false;

exports.check = () => {
  autoUpdater.checkForUpdates();

  autoUpdater.on('update-available', () => {

    let downloadProgress = 0;

    dialog.showMessageBox({
      type: 'info',
      title: 'Update Available',
      message: 'A new version of PIA is available. Do you want to update now?',
      buttons: ['Update', 'No']
    }, (buttonIndex) => {
      if(buttonIndex !== 0) return;

      autoUpdater.downloadUpdate();

      let progressWin = new BrowserWindow({
        width: 350,
        height: 35,
        useContentSize: true,
        autoHideMenuBar: true,
        maximizable: false,
        fullscreen: false,
        fullscreenable: false,
        resizable: false
      });

      progressWin.loadURL(url.format({
        pathname: path.join(__dirname, 'renderer', 'progress.html'),
        protocol: 'file:',
        slashes: true
      }));

      progressWin.on('closed', () => {
        progressWin = null
      });

      ipcMain.on('download-progress-request', (e) => {
        e.returnValue = downloadProgress
      });

      autoUpdater.on('download-progress', (d) => {
        console.log(d.percent);
        downloadProgress = d.percent
      });

      autoUpdater.on('update-downloaded', () => {
        if (progressWin) progressWin.close();
        dialog.showMessageBox({
          type: 'info',
          title: 'Update ready',
          message: 'A new version of PIA is ready. Quit and install now?',
          buttons: ['Yes', 'Later']
        }, (buttonIndex) => {
          if (buttonIndex === 0) autoUpdater.quitAndInstall()
        })
      })
    })
  })
};