Axum v0.8.4 HTTP/1 サーバー最小構成

Cargo.toml

[dependencies]
axum = { version = "0.8" }
tokio = { version = "1", features = ["full"] }

main.rs

use axum::{routing::get, Router};
use std::net::SocketAddr;

#[tokio::main]
async fn main() {
    let app = Router::new().route("/", get(handler));

    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
    println!("Listening on http://{}", addr);

    let listener = tokio::net::TcpListener::bind(addr)
        .await
        .expect("failed to bind");
    axum::serve(listener, app)
        .await
        .expect("server error");
}

async fn handler() -> &'static str {
    "Hello, Axum v0.8.4!"
}

main_with_graceful_shutdown.rs

use axum::{routing::get, Router};
use std::net::SocketAddr;
use tokio::signal;

#[tokio::main]
async fn main() {
    let app = Router::new().route("/", get(handler));

    let addr = SocketAddr::from(([127, 0, 0, 1], 3000));
    println!("Listening on http://{}", addr);

    let listener = tokio::net::TcpListener::bind(addr)
        .await
        .expect("failed to bind");

    // シャットダウンシグナルを受け取る
    let shutdown_signal = async {
        signal::ctrl_c()
            .await
            .expect("failed to install Ctrl+C handler");
        println!("\nReceived shutdown signal. Cleaning up...");
    };

    axum::serve(listener, app)
        .with_graceful_shutdown(shutdown_signal)
        .await
        .expect("server error");

    println!("Server shut down gracefully.");
}

async fn handler() -> &'static str {
    "Hello, Axum v0.8.4 with graceful shutdown!"
}