如何使用共享變量 Rust 的 Rocket web 框架？

Question

我正在嘗試在路由功能中使用共享資源，例如在我的 hello() function 中訪問變量“shared_resource”

#[launch]
fn rocket() -> _ {
    let shared_resource = SharedResource::new()
    rocket::build().mount("/", routes![hello])
}

#[get("/")]
fn hello() -> &'static str {
    let _ = shared_resource.some_method()
    "Hello, world!"
}

我如何實現這一目標？

Answer 1

您可以為此使用rocket::State 。

只要SharedResource實現Send + Sync + 'static並在啟動時初始化，這將起作用。

例子

#[launch]
fn rocket() -> _ {
    let shared_resource = SharedResource::new()
    rocket::build()
        .mount("/", routes![hello])
        .manage(shared_resource)
}

#[get("/")]
fn hello(shared_resource: State<SharedResource>) -> &'static str {
    let _ = shared_resource.some_method()
    "Hello, world!"
}