handle stop signal

src/app.js

@@ -70,3 +70,15 @@ io.on('connection', async (socket) => {
 const server = http.listen(port, () => {
     console.log(`server is running on port ${server.address().port}`);
 });
+
+
+// handle stop signal
+const shutdown = () => {
+  console.log('Stopping server.');
+  process.exit();
+  // server.close(() => {
+  //   console.log('Stopped server.');
+  // });
+};
+process.on('SIGINT', shutdown);
+process.on('SIGTERM', shutdown);