We can now add logging to our microservice. In the following example, we will print information about the socket address, the incoming request, and a generated random value:

fn main() {
     logger::init();
     info!("Rand Microservice - v0.1.0");
     trace!("Starting...");
     let addr = ([127, 0, 0, 1], 8080).into();
     debug!("Trying to bind server to address: {}", addr);
     let builder = Server::bind(&addr);
     trace!("Creating service handler...");
     let server = builder.serve(|| {
         service_fn_ok(|req| {
             trace!("Incoming request is: {:?}", req);
             let random_byte = rand::random::<u8>();
             debug!("Generated value is: {}", random_byte);
             Response::new(Body::from(random_byte.to_string()))
         })
     });
     info!("Used address: {}", server.local_addr());
     let server = server.map_err(drop);
     debug!("Run!");
     hyper::rt::run(server);
 }

Using logging is quite simple. We can use macros to print the address of the socket and information about the request and response.