feat: Add game activity status (Experimental)

electron/README.md

@@ -16,6 +16,7 @@ Electron main-process package for MetoYou / Toju. This directory owns desktop bo
 | --- | --- |
 | `main.ts` | Electron app bootstrap and process entry point |
 | `preload.ts` | Typed renderer-facing preload bridge |
+| `process-list.ts` | Linux/Windows process-name scan used by now-playing game detection |
 | `app/` | App lifecycle and startup composition |
 | `ipc/` | Renderer-invoked IPC handlers |
 | `cqrs/` | Local database command/query handlers and mappings |
@@ -28,4 +29,4 @@ Electron main-process package for MetoYou / Toju. This directory owns desktop bo
 
 - When adding a renderer-facing capability, update the Electron implementation, `preload.ts`, and the renderer bridge in `toju-app/` together.
 - Treat `dist/electron/` and `dist-electron/` as generated output.
-- See [AGENTS.md](AGENTS.md) for package-level editing rules.
+- See [AGENTS.md](AGENTS.md) for package-level editing rules.

electron/db/database.ts

@@ -26,6 +26,24 @@ let dbBackupPath = '';
 
 // SQLite files start with this 16-byte header string.
 const SQLITE_MAGIC = 'SQLite format 3\0';
+const SAVE_RETRY_DELAYS_MS = [25, 75, 150, 300, 600];
+const RETRYABLE_SAVE_ERROR_CODES = new Set(['EPERM', 'EACCES', 'EBUSY']);
+
+let saveQueue: Promise<void> = Promise.resolve();
+
+function wait(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+function isRetryableSaveError(error: unknown): boolean {
+  if (!error || typeof error !== 'object') {
+    return false;
+  }
+
+  const code = (error as NodeJS.ErrnoException).code;
+
+  return typeof code === 'string' && RETRYABLE_SAVE_ERROR_CODES.has(code);
+}
 
 export function getDataSource(): DataSource | undefined {
   return applicationDataSource;
@@ -87,18 +105,47 @@ function safeguardDbFile(): Uint8Array | undefined {
  * then rename it over the real file. rename() is atomic on the same
  * filesystem, so a crash mid-write can never leave a half-written DB.
  */
-async function atomicSave(data: Uint8Array): Promise<void> {
+async function replaceDatabaseFile(tmpPath: string): Promise<void> {
+  for (let attempt = 0; ; attempt++) {
+    try {
+      await fsp.rename(tmpPath, dbFilePath);
+      return;
+    } catch (error) {
+      const delay = SAVE_RETRY_DELAYS_MS[attempt];
+
+      if (!isRetryableSaveError(error) || delay === undefined) {
+        throw error;
+      }
+
+      await wait(delay);
+    }
+  }
+}
+
+async function writeDatabaseSnapshot(snapshot: Buffer): Promise<void> {
   const tmpPath = dbFilePath + '.tmp-' + randomBytes(6).toString('hex');
 
   try {
-    await fsp.writeFile(tmpPath, Buffer.from(data));
-    await fsp.rename(tmpPath, dbFilePath);
+    await fsp.writeFile(tmpPath, snapshot);
+    await replaceDatabaseFile(tmpPath);
   } catch (err) {
     await fsp.unlink(tmpPath).catch(() => {});
     throw err;
   }
 }
 
+async function atomicSave(data: Uint8Array): Promise<void> {
+  const snapshot = Buffer.from(data);
+  const saveTask = saveQueue.then(
+    () => writeDatabaseSnapshot(snapshot),
+    () => writeDatabaseSnapshot(snapshot)
+  );
+
+  saveQueue = saveTask.catch(() => {});
+
+  return saveTask;
+}
+
 export async function initializeDatabase(): Promise<void> {
   const userDataPath = app.getPath('userData');
   const dbDir = path.join(userDataPath, 'metoyou');

electron/ipc/system.ts

@@ -55,6 +55,7 @@ import {
   importUserData,
   openCurrentDataFolder
 } from '../data-management';
+import { listRunningProcessNames } from '../process-list';
 
 const DEFAULT_MIME_TYPE = 'application/octet-stream';
 const FILE_CLIPBOARD_FORMATS = [
@@ -320,6 +321,8 @@ export function setupSystemHandlers(): void {
     }
   });
 
+  ipcMain.handle('get-running-process-names', async () => await listRunningProcessNames());
+
   ipcMain.handle('prepare-linux-screen-share-audio-routing', async () => {
     return await prepareLinuxScreenShareAudioRouting();
   });

electron/preload.ts

@@ -167,6 +167,7 @@ export interface ElectronAPI {
 
   openExternal: (url: string) => Promise<boolean>;
   getSources: () => Promise<{ id: string; name: string; thumbnail: string }[]>;
+  getRunningProcessNames: () => Promise<string[]>;
   prepareLinuxScreenShareAudioRouting: () => Promise<LinuxScreenShareAudioRoutingInfo>;
   activateLinuxScreenShareAudioRouting: () => Promise<LinuxScreenShareAudioRoutingInfo>;
   deactivateLinuxScreenShareAudioRouting: () => Promise<boolean>;
@@ -252,6 +253,7 @@ const electronAPI: ElectronAPI = {
 
   openExternal: (url) => ipcRenderer.invoke('open-external', url),
   getSources: () => ipcRenderer.invoke('get-sources'),
+  getRunningProcessNames: () => ipcRenderer.invoke('get-running-process-names'),
   prepareLinuxScreenShareAudioRouting: () => ipcRenderer.invoke('prepare-linux-screen-share-audio-routing'),
   activateLinuxScreenShareAudioRouting: () => ipcRenderer.invoke('activate-linux-screen-share-audio-routing'),
   deactivateLinuxScreenShareAudioRouting: () => ipcRenderer.invoke('deactivate-linux-screen-share-audio-routing'),

electron/process-list.ts

@@ -0,0 +1,85 @@
+import { execFile } from 'child_process';
+import * as path from 'path';
+import { promisify } from 'util';
+
+const execFileAsync = promisify(execFile);
+const MAX_PROCESS_NAMES = 512;
+
+export async function listRunningProcessNames(): Promise<string[]> {
+  if (process.platform === 'win32') {
+    return normalizeProcessNames(await listWindowsProcessNames());
+  }
+
+  if (process.platform === 'linux') {
+    return normalizeProcessNames(await listLinuxProcessNames());
+  }
+
+  return [];
+}
+
+async function listLinuxProcessNames(): Promise<string[]> {
+  const { stdout } = await execFileAsync('ps', ['-eo', 'comm='], {
+    maxBuffer: 1024 * 1024,
+    timeout: 5_000
+  });
+
+  return stdout.split('\n');
+}
+
+async function listWindowsProcessNames(): Promise<string[]> {
+  const { stdout } = await execFileAsync('tasklist', [
+    '/FO',
+    'CSV',
+    '/NH'
+  ], {
+    maxBuffer: 1024 * 1024,
+    timeout: 5_000,
+    windowsHide: true
+  });
+
+  return stdout
+    .split(/\r?\n/)
+    .map((line) => parseCsvFirstColumn(line));
+}
+
+function parseCsvFirstColumn(line: string): string {
+  const trimmed = line.trim();
+
+  if (!trimmed) {
+    return '';
+  }
+
+  if (!trimmed.startsWith('"')) {
+    return trimmed.split(',')[0] ?? '';
+  }
+
+  const endQuoteIndex = trimmed.indexOf('"', 1);
+
+  return endQuoteIndex > 1 ? trimmed.slice(1, endQuoteIndex) : '';
+}
+
+function normalizeProcessNames(names: string[]): string[] {
+  const normalized = new Set<string>();
+
+  for (const rawName of names) {
+    const name = normalizeProcessName(rawName);
+
+    if (name) {
+      normalized.add(name);
+    }
+  }
+
+  return Array.from(normalized)
+    .sort()
+    .slice(0, MAX_PROCESS_NAMES);
+}
+
+function normalizeProcessName(rawName: string): string {
+  const baseName = path.basename(rawName.trim()).trim();
+
+  if (!baseName || baseName.length > 96) {
+    return '';
+  }
+
+  return baseName;
+}