0005 axum

use axum::{
    routing::{get, post, Router},
    extract::{Json}
};

#[tokio::main]
async fn main() {
    tracing_subscriber::fmt::init();
    let app = Router::new()
        .route("/", get(root))
        .route("/users", post(create_user));

    let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
    axum::serve(listener, app).await.unwrap();
}

async fn root() -> &'static str {
    "Hello, World!"
}

async fn create_user(Json(payment):Json<CreateUser>) -> Json<User> {
    tracing::info!("create_user: {:?}", payment);
    let user = User {
        id: 1,
        username: payment.username,
        email: payment.email,
    };
    Json(user)
}

#[derive(serde::Deserialize, Debug)]
struct CreateUser {
    username: String,
    email: String,
}

#[derive(serde::Serialize, serde::Deserialize,Debug)]
struct User {
    id: u32,
    username: String,
    email: String,
}

jsonにするときにstructがSerializeできるようにderiveをつけておく

[package]
name = "axum"
version = "0.1.0"
edition = "2024"

[dependencies]
tokio = { version = "1", features = ["full"] }
axum = "0.8"
serde = { version = "1", features = ["derive"] }
tracing-subscriber = { version = "0.3"}
tracing = "0.1"
anyhow = "1.0"