refactor(desktop): extract server startup into modules/server.ts

surfsense_desktop/src/modules/server.ts

@@ -0,0 +1,53 @@
+import path from 'path';
+import { app } from 'electron';
+import { getPort } from 'get-port-please';
+
+const isDev = !app.isPackaged;
+let serverPort = 3000;
+
+export function getServerPort(): number {
+  return serverPort;
+}
+
+function getStandalonePath(): string {
+  if (isDev) {
+    return path.join(__dirname, '..', '..', 'surfsense_web', '.next', 'standalone', 'surfsense_web');
+  }
+  return path.join(process.resourcesPath, 'standalone');
+}
+
+async function waitForServer(url: string, maxRetries = 60): Promise<boolean> {
+  for (let i = 0; i < maxRetries; i++) {
+    try {
+      const res = await fetch(url);
+      if (res.ok || res.status === 404 || res.status === 500) return true;
+    } catch {
+      // not ready yet
+    }
+    await new Promise((r) => setTimeout(r, 500));
+  }
+  return false;
+}
+
+export async function startNextServer(): Promise<void> {
+  if (isDev) return;
+
+  serverPort = await getPort({ port: 3000, portRange: [30_011, 50_000] });
+  console.log(`Selected port ${serverPort}`);
+
+  const standalonePath = getStandalonePath();
+  const serverScript = path.join(standalonePath, 'server.js');
+
+  process.env.PORT = String(serverPort);
+  process.env.HOSTNAME = 'localhost';
+  process.env.NODE_ENV = 'production';
+  process.chdir(standalonePath);
+
+  require(serverScript);
+
+  const ready = await waitForServer(`http://localhost:${serverPort}`);
+  if (!ready) {
+    throw new Error('Next.js server failed to start within 30 s');
+  }
+  console.log(`Next.js server ready on port ${serverPort}`);
+}