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use super::SpawnReady;
use futures_core::ready;
use pin_project_lite::pin_project;
use std::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use tower_service::Service;
#[derive(Clone, Debug)]
pub struct MakeSpawnReady<S> {
inner: S,
}
impl<S> MakeSpawnReady<S> {
pub fn new(service: S) -> Self {
Self { inner: service }
}
}
pin_project! {
#[derive(Debug)]
pub struct MakeFuture<F> {
#[pin]
inner: F,
}
}
impl<S, Target> Service<Target> for MakeSpawnReady<S>
where
S: Service<Target>,
{
type Response = SpawnReady<S::Response>;
type Error = S::Error;
type Future = MakeFuture<S::Future>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.inner.poll_ready(cx)
}
fn call(&mut self, target: Target) -> Self::Future {
MakeFuture {
inner: self.inner.call(target),
}
}
}
impl<F, T, E> Future for MakeFuture<F>
where
F: Future<Output = Result<T, E>>,
{
type Output = Result<SpawnReady<T>, E>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = self.project();
let inner = ready!(this.inner.poll(cx))?;
let svc = SpawnReady::new(inner);
Poll::Ready(Ok(svc))
}
}