【Rust】Axumでなんとかログイン機能を作りたい(その3)

axumでユーザの登録画面、insert文を作っていきます。
L formで送られてきたパスワードをハッシュ化して、usrnameと一緒に保存します。

async fn handle_save(form: Form<SignUp>)-> axum::response::Html<String> {
    let register: SignUp = form.0;
    let password_hash = hashing_password(&register.password);

    println!("{}", &password_hash);

    let _ = db_save(&register.username.to_string(), &password_hash).await.unwrap();

    let tera = tera::Tera::new("templates/*").unwrap();

    let mut context = tera::Context::new();
    context.insert("title", "Index page");

    let output = tera.render("index.html", &context);
    axum::response::Html(output.unwrap())
}

async fn db_save(name: &String, password: &String) -> Result<(), Box<dyn std::error::Error>> {
    let (client, connection) = tokio_postgres::connect("host=localhost user=postgres password=password", NoTls).await?;

    tokio::spawn(async move {
        if let Err(e) = connection.await {
            eprintln!("connection error: {}", e);
        }
    });
    client.execute(
        "INSERT INTO users (username, password) VALUES ($1, $2)",
        &[&name, &password],
    ).await?;

    for row in client.query("SELECT id, username, password From users", &[]).await? {
        let id: i32 = row.get(0);
        let name: String = row.get(1);
        let password: String = row.get(2);

        println!("{} {} {}", id, name, password);
    }
    Ok(())
}

Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.95s
Running `target/debug/login`
$2b$08$OxMrzm88ag/iPtKahE3kveHNmmUI5uAuYGuY.lcCybGGqN8cYx/km
1 hpscript $2b$08$bKVELv/My0WaKvoyTltoLe3pOp7VJ4UxtxuA3C5qurnAblnqXbcfi
2 yamada $2b$08$OxMrzm88ag/iPtKahE3kveHNmmUI5uAuYGuY.lcCybGGqN8cYx/km

ここまでは割と簡単なんだけど、問題はここからなんだよな〜