feat(updater): add UpdaterService wrapping electron-updater lifecycle

src/main/updater/updater-service.js

@@ -0,0 +1,42 @@
+const { EventEmitter } = require('events');
+const DEBOUNCE_MS = 60_000;
+
+class UpdaterService extends EventEmitter {
+  constructor(autoUpdater) {
+    super();
+    this.autoUpdater = autoUpdater;
+    this.state = 'idle';
+    this.lastCheckAt = 0;
+    this._wire();
+  }
+
+  _wire() {
+    const au = this.autoUpdater;
+    au.on('checking-for-update', () => this._emit({ state: 'checking' }));
+    au.on('update-available', (info) => this._emit({ state: 'available', version: info.version }));
+    au.on('download-progress', (p) => this._emit({ state: 'downloading', percent: p.percent }));
+    au.on('update-downloaded', (info) => this._emit({ state: 'ready', version: info.version }));
+    au.on('update-not-available', () => this._emit({ state: 'idle' }));
+    au.on('error', (err) => {
+      const code = err && /ENOTFOUND|ETIMEDOUT|ECONNREFUSED/.test(err.message) ? 'NETWORK' : 'UNKNOWN';
+      this._emit({ state: 'error', code });
+    });
+  }
+
+  _emit(payload) {
+    this.state = payload.state;
+    this.emit('status', payload);
+  }
+
+  async check() {
+    if (Date.now() - this.lastCheckAt < DEBOUNCE_MS) return;
+    this.lastCheckAt = Date.now();
+    await this.autoUpdater.checkForUpdates();
+  }
+
+  install() {
+    this.autoUpdater.quitAndInstall();
+  }
+}
+
+module.exports = { UpdaterService };