rocket_session/examples/minimal/main.rs

#[macro_use]
extern crate rocket;

use std::time::Duration;

type Session<'a> = rocket_session::Session<'a, u64>;

#[launch]
fn rocket() -> _ {
    // This session expires in 15 seconds as a demonstration of session configuration
    rocket::build()
        .attach(Session::fairing().with_lifetime(Duration::from_secs(15)))
        .mount("/", routes![index])
}

#[get("/")]
fn index(session: Session) -> String {
    let count = session.tap(|n| {
        // Change the stored value (it is &mut)
        *n += 1;

        // Return something to the caller.
        // This can be any type, 'tap' is generic.
        *n
    });

    format!("{} visits", count)
}