Hands-On Microservices with Rust

Server

The main function activates a logger and spawns a worker. Then, we extract the ADDRESS environment variable to use this address value to bind a socket of a server. Loot at the following code:

fn main() -> Result<(), Error> {    env_logger::init();    let tx = spawn_worker()?;    let addr: SocketAddr = env::var("ADDRESS")?.parse()?;    let mut io = IoHandler::default();    let sender = Mutex::new(tx.clone());    io.add_method(START_ROLL_CALL, move |_| {        trace!("START_ROLL_CALL");        let tx = sender            .lock()            .map_err(to_internal)?;        tx.send(Action::StartRollCall)            .map_err(to_internal)            .map(|_| Value::Bool(true))    });    let sender = Mutex::new(tx.clone());    io.add_method(MARK_ITSELF, move |_| {        trace!("MARK_ITSELF");        let tx = sender            .lock() .map_err(to_internal)?; ...