feat: add helper process (#2753)

apps/electron/src/main/index.ts

@@ -0,0 +1,71 @@
+import './security-restrictions';
+
+import { app } from 'electron';
+
+import { createApplicationMenu } from './application-menu/create';
+import { registerEvents } from './events';
+import { registerHandlers } from './handlers';
+import { ensureHelperProcess } from './helper-process';
+import { logger } from './logger';
+import { restoreOrCreateWindow } from './main-window';
+import { registerPlugin } from './plugin';
+import { registerProtocol } from './protocol';
+import { registerUpdater } from './updater';
+
+if (require('electron-squirrel-startup')) app.quit();
+// allow tests to overwrite app name through passing args
+if (process.argv.includes('--app-name')) {
+  const appNameIndex = process.argv.indexOf('--app-name');
+  const appName = process.argv[appNameIndex + 1];
+  app.setName(appName);
+}
+
+/**
+ * Prevent multiple instances
+ */
+const isSingleInstance = app.requestSingleInstanceLock();
+if (!isSingleInstance) {
+  logger.info('Another instance is running, exiting...');
+  app.quit();
+  process.exit(0);
+}
+
+app.on('second-instance', () => {
+  restoreOrCreateWindow().catch(e =>
+    console.error('Failed to restore or create window:', e)
+  );
+});
+
+app.on('open-url', async (_, _url) => {
+  // todo: handle `affine://...` urls
+});
+
+/**
+ * Shout down background process if all windows was closed
+ */
+app.on('window-all-closed', () => {
+  if (process.platform !== 'darwin') {
+    app.quit();
+  }
+});
+
+/**
+ * @see https://www.electronjs.org/docs/v14-x-y/api/app#event-activate-macos Event: 'activate'
+ */
+app.on('activate', restoreOrCreateWindow);
+
+/**
+ * Create app window when background process will be ready
+ */
+app
+  .whenReady()
+  .then(registerProtocol)
+  .then(registerHandlers)
+  .then(registerEvents)
+  .then(registerPlugin)
+  .then(ensureHelperProcess)
+  .then(restoreOrCreateWindow)
+  .then(createApplicationMenu)
+  .then()
+  .then(registerUpdater)
+  .catch(e => console.error('Failed create window:', e));