element-web/electron_app/src/updater.js

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const { app, autoUpdater, ipcMain } = require('electron');
const UPDATE_POLL_INTERVAL_MS = 60 * 60 * 1000;
const INITIAL_UPDATE_DELAY_MS = 30 * 1000;
function installUpdate() {
// for some reason, quitAndInstall does not fire the
// before-quit event, so we need to set the flag here.
global.appQuitting = true;
autoUpdater.quitAndInstall();
}
function pollForUpdates() {
try {
autoUpdater.checkForUpdates();
} catch (e) {
console.log('Couldn\'t check for update', e);
}
}
module.exports = {};
module.exports.start = function startAutoUpdate(updateBaseUrl) {
if (updateBaseUrl.slice(-1) !== '/') {
updateBaseUrl = updateBaseUrl + '/';
}
try {
let url;
// For reasons best known to Squirrel, the way it checks for updates
// is completely different between macOS and windows. On macOS, it
// hits a URL that either gives it a 200 with some json or
// 204 No Content. On windows it takes a base path and looks for
// files under that path.
if (process.platform === 'darwin') {
// include the current version in the URL we hit. Electron doesn't add
// it anywhere (apart from the User-Agent) so it's up to us. We could
// (and previously did) just use the User-Agent, but this doesn't
// rely on NSURLConnection setting the User-Agent to what we expect,
// and also acts as a convenient cache-buster to ensure that when the
// app updates it always gets a fresh value to avoid update-looping.
url = `${updateBaseUrl}macos/?localVersion=${encodeURIComponent(app.getVersion())}`;
} else if (process.platform === 'win32') {
url = `${updateBaseUrl}win32/${process.arch}/`;
} else {
// Squirrel / electron only supports auto-update on these two platforms.
// I'm not even going to try to guess which feed style they'd use if they
// implemented it on Linux, or if it would be different again.
console.log('Auto update not supported on this platform');
}
if (url) {
autoUpdater.setFeedURL(url);
// We check for updates ourselves rather than using 'updater' because we need to
// do it in the main process (and we don't really need to check every 10 minutes:
// every hour should be just fine for a desktop app)
// However, we still let the main window listen for the update events.
// We also wait a short time before checking for updates the first time because
// of squirrel on windows and it taking a small amount of time to release a
// lock file.
setTimeout(pollForUpdates, INITIAL_UPDATE_DELAY_MS);
setInterval(pollForUpdates, UPDATE_POLL_INTERVAL_MS);
}
} catch (err) {
// will fail if running in debug mode
console.log('Couldn\'t enable update checking', err);
}
}
ipcMain.on('install_update', installUpdate);
ipcMain.on('check_updates', pollForUpdates);
function ipcChannelSendUpdateStatus(status) {
if (global.mainWindow) {
global.mainWindow.webContents.send('check_updates', status);
}
}
autoUpdater.on('update-available', function() {
ipcChannelSendUpdateStatus(true);
}).on('update-not-available', function() {
ipcChannelSendUpdateStatus(false);
}).on('error', function(error) {
ipcChannelSendUpdateStatus(error.message);
});