ntex-service 5.0.0

ntex service
Documentation 
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use std::{future::Future, future::poll_fn, pin, pin::Pin, task::Poll};

use crate::{Ctx, Service};

pub(crate) type BoxFuture<'a, R> = Pin<Box<dyn Future<Output = R> + 'a>>;

pub(crate) async fn shutdown<S, St, A, B, RA, RB>(svc1: &A, svc2: &B, ctx: Ctx<'_, S, St>)
where
    A: Service<St, RA>,
    B: Service<St, RB>,
{
    let mut fut1 = pin::pin!(ctx.shutdown(svc1));
    let mut fut2 = pin::pin!(ctx.shutdown(svc2));

    let mut ready1 = false;
    let mut ready2 = false;

    poll_fn(move |cx| {
        if !ready1 && Pin::new(&mut fut1).poll(cx).is_ready() {
            ready1 = true;
        }
        if !ready2 && Pin::new(&mut fut2).poll(cx).is_ready() {
            ready2 = true;
        }
        if ready1 && ready2 {
            Poll::Ready(())
        } else {
            Poll::Pending
        }
    })
    .await;
}

pub(crate) async fn ready<S, St, A, B, RA, RB>(
    svc1: &A,
    svc2: &B,
    ctx: Ctx<'_, S, St>,
) -> Result<(), A::Error>
where
    A: Service<St, RA>,
    B: Service<St, RB, Error = A::Error>,
{
    let mut fut1 = pin::pin!(ctx.ready(svc1));
    let mut fut2 = pin::pin!(ctx.ready(svc2));

    let mut ready1 = false;
    let mut ready2 = false;

    poll_fn(move |cx| {
        if !ready1 && Pin::new(&mut fut1).poll(cx)?.is_ready() {
            ready1 = true;
        }
        if !ready2 && Pin::new(&mut fut2).poll(cx)?.is_ready() {
            ready2 = true;
        }
        if ready1 && ready2 {
            Poll::Ready(Ok(()))
        } else {
            Poll::Pending
        }
    })
    .await
}