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use pin_project_lite::pin_project;
use std::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use super::Oneshot;
/// A tower [`Service`][tower-svc] converted into a hyper [`Service`][hyper-svc].
///
/// This wraps an inner tower service `S` in a [`hyper::service::Service`] implementation. See
/// the module-level documentation of [`service`][crate::service] for more information about using
/// [`tower`][tower] services and middleware with [`hyper`].
///
/// [hyper-svc]: hyper::service::Service
/// [tower]: https://docs.rs/tower/latest/tower/
/// [tower-svc]: https://docs.rs/tower/latest/tower/trait.Service.html
#[derive(Debug, Copy, Clone)]
pub struct TowerToHyperService<S> {
service: S,
}
impl<S> TowerToHyperService<S> {
/// Create a new [`TowerToHyperService`] from a tower service.
pub fn new(tower_service: S) -> Self {
Self {
service: tower_service,
}
}
}
impl<S, R> hyper::service::Service<R> for TowerToHyperService<S>
where
S: tower_service::Service<R> + Clone,
{
type Response = S::Response;
type Error = S::Error;
type Future = TowerToHyperServiceFuture<S, R>;
fn call(&self, req: R) -> Self::Future {
TowerToHyperServiceFuture {
future: Oneshot::new(self.service.clone(), req),
}
}
}
pin_project! {
/// Response future for [`TowerToHyperService`].
///
/// This future is acquired by [`call`][hyper::service::Service::call]ing a
/// [`TowerToHyperService`].
pub struct TowerToHyperServiceFuture<S, R>
where
S: tower_service::Service<R>,
{
#[pin]
future: Oneshot<S, R>,
}
}
impl<S, R> Future for TowerToHyperServiceFuture<S, R>
where
S: tower_service::Service<R>,
{
type Output = Result<S::Response, S::Error>;
#[inline]
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
self.project().future.poll(cx)
}
}
|
