Stopping Our App

Our WebServerService is pretty smart. It creates a server for us on-demand, while also handling any requests from users on the server's port.

However, one thing it doesn't do is allow the consumer to shut down the server. Currently, the only way to do this is to stop the Node.js process altogether.

tip

This is an anti-pattern; services should always provide a way to close down any resources they may create over their lifetime. For example, a service managing database connections should allow for the closing of connections too.

Let's update our web server service to provide a shutdown method, which will shutdown the active HTTP server.

// ...

@Service([DatabaseService])
class WebServerService {
  // ...
  stopServer() {
    if (this.server?.listening) {
      this.server.close();
    }
  }
  // ...
}