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use std::{future::Future, marker::PhantomData};
use crate::{apply_fn, dev::Apply, Service, Transform};
pub fn fn_transform<S, F, R, Req, Res, Err>(f: F) -> FnTransform<S, F, R, Req, Res, Err>
where
S: Service<Error = Err>,
F: Fn(Req, &S) -> R + Clone,
R: Future<Output = Result<Res, Err>>,
{
FnTransform::new(f)
}
pub struct FnTransform<S, F, R, Req, Res, Err>
where
S: Service<Error = Err>,
F: Fn(Req, &S) -> R + Clone,
R: Future<Output = Result<Res, Err>>,
{
f: F,
_t: PhantomData<(S, R, Req)>,
}
impl<S, F, R, Req, Res, Err> FnTransform<S, F, R, Req, Res, Err>
where
S: Service<Error = Err>,
F: Fn(Req, &S) -> R + Clone,
R: Future<Output = Result<Res, Err>>,
{
fn new(f: F) -> Self {
FnTransform { f, _t: PhantomData }
}
}
impl<S, F, R, Req, Res, Err> Transform<S> for FnTransform<S, F, R, Req, Res, Err>
where
S: Service<Error = Err>,
F: Fn(Req, &S) -> R + Clone,
R: Future<Output = Result<Res, Err>>,
{
type Service = Apply<S, F, R, Req, Res, Err>;
fn new_transform(&self, service: S) -> Self::Service {
apply_fn(service, self.f.clone())
}
}
impl<S, F, R, Req, Res, Err> Clone for FnTransform<S, F, R, Req, Res, Err>
where
S: Service<Error = Err>,
F: Fn(Req, &S) -> R + Clone,
R: Future<Output = Result<Res, Err>>,
{
fn clone(&self) -> Self {
Self::new(self.f.clone())
}
}
#[cfg(test)]
#[allow(clippy::redundant_clone)]
mod tests {
use ntex_util::future::{lazy, Ready};
use std::task::{Context, Poll};
use super::*;
use crate::Service;
#[derive(Clone)]
struct Srv;
impl Service for Srv {
type Request = usize;
type Response = usize;
type Error = ();
type Future = Ready<usize, ()>;
fn poll_ready(&self, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&self, i: usize) -> Self::Future {
Ready::Ok(i * 2)
}
}
#[ntex::test]
async fn transform() {
let srv = fn_transform(|i: usize, srv: &Srv| srv.call(i + 1)).new_transform(Srv);
let res = srv.call(10usize).await;
assert!(res.is_ok());
assert_eq!(res.unwrap(), 22);
let res = lazy(|cx| srv.poll_ready(cx)).await;
assert_eq!(res, Poll::Ready(Ok(())));
let res = lazy(|cx| srv.poll_shutdown(cx, true)).await;
assert_eq!(res, Poll::Ready(()));
}
}