Is it possible to use state elsewhere? about viz

[fundon]

Do you have the complete code?

[Baiyuetribe]

viz/examples/routing/todos/src/main.rs

Line 74 in 24f224f

async fn show(mut req: Request) -> Result<Response> {

modify this method:

async fn show(_: Request) -> Result<Response> {
    let mut req = Request::builder().body(IncomingBody::Empty).unwrap();
    let State(db) = req.extract::<State<DB>>().await?;
    let _ = db.lock();
    println!("print if db is ok");
    Ok(Response::text("Hello, World!"))
}

cargo run --bin todos
try : http://127.0.0.1:3000/todos/1

[fundon]

@Baiyuetribe

It's correct. In original, the DB state has been added to the request:

viz/examples/routing/todos/src/main.rs

Line 137 in 24f224f

.with(State::new(db))

[Baiyuetribe]

@fundon no,it not work

viz/examples/routing/todos/src/main.rs

Line 74 in 24f224f

async fn show(mut req: Request) -> Result<Response> {

modify this method:

async fn show(_: Request) -> Result<Response> {
    let mut req = Request::builder().body(IncomingBody::Empty).unwrap();
    let State(db) = req.extract::<State<DB>>().await?; // ***erorr***
    let _ = db.lock();
    println!("print if db is ok");
    Ok(Response::text("Hello, World!"))
}

cargo run --bin todos try : http://127.0.0.1:3000/todos/1

[fundon]

Forged a request, if we want to extract some stats from request, we should add stats to it use set_state method, when it cannot be found, a 500 error is returned.

viz/viz-core/src/request.rs

Lines 141 to 145 in 7fc08df

	/// Store a shared state.
	#[cfg(feature = "state")]
	fn set_state<T>(&mut self, t: T) -> Option<T>
	where
	T: Clone + Send + Sync + 'static;