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use std::convert::Infallible;
use std::task::{Context, Poll};
use tower_service::Service;
#[derive(Debug, Clone, Copy)]
pub struct Shared<S> {
service: S,
}
impl<S> Shared<S> {
pub fn new(service: S) -> Self {
Self { service }
}
}
impl<S, T> Service<T> for Shared<S>
where
S: Clone,
{
type Response = S;
type Error = Infallible;
type Future = SharedFuture<S>;
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, _target: T) -> Self::Future {
SharedFuture(futures_util::future::ready(Ok(self.service.clone())))
}
}
opaque_future! {
pub type SharedFuture<S> = futures_util::future::Ready<Result<S, Infallible>>;
}
#[cfg(test)]
mod tests {
use super::*;
use crate::make::MakeService;
use crate::service_fn;
use futures::future::poll_fn;
async fn echo<R>(req: R) -> Result<R, Infallible> {
Ok(req)
}
#[tokio::test]
async fn as_make_service() {
let mut shared = Shared::new(service_fn(echo::<&'static str>));
poll_fn(|cx| MakeService::<(), _>::poll_ready(&mut shared, cx))
.await
.unwrap();
let mut svc = shared.make_service(()).await.unwrap();
poll_fn(|cx| svc.poll_ready(cx)).await.unwrap();
let res = svc.call("foo").await.unwrap();
assert_eq!(res, "foo");
}
#[tokio::test]
async fn as_make_service_into_service() {
let shared = Shared::new(service_fn(echo::<&'static str>));
let mut shared = MakeService::<(), _>::into_service(shared);
poll_fn(|cx| Service::<()>::poll_ready(&mut shared, cx))
.await
.unwrap();
let mut svc = shared.call(()).await.unwrap();
poll_fn(|cx| svc.poll_ready(cx)).await.unwrap();
let res = svc.call("foo").await.unwrap();
assert_eq!(res, "foo");
}
}