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use std::marker::PhantomData;
use futures::future::{ok, FutureResult};
use futures::IntoFuture;
use crate::{Apply, IntoTransform, Service, Transform};
pub fn fn_transform<F, S, In, Out, Err>(
f: F,
) -> impl Transform<S, Request = In, Response = Out::Item, Error = Out::Error, InitError = Err>
where
S: Service,
F: FnMut(In, &mut S) -> Out + Clone,
Out: IntoFuture,
Out::Error: From<S::Error>,
{
FnTransform::new(f)
}
pub struct FnTransform<F, S, In, Out, Err>
where
F: FnMut(In, &mut S) -> Out + Clone,
Out: IntoFuture,
{
f: F,
_t: PhantomData<(S, In, Out, Err)>,
}
impl<F, S, In, Out, Err> FnTransform<F, S, In, Out, Err>
where
F: FnMut(In, &mut S) -> Out + Clone,
Out: IntoFuture,
{
pub fn new(f: F) -> Self {
FnTransform { f, _t: PhantomData }
}
}
impl<F, S, In, Out, Err> Transform<S> for FnTransform<F, S, In, Out, Err>
where
S: Service,
F: FnMut(In, &mut S) -> Out + Clone,
Out: IntoFuture,
Out::Error: From<S::Error>,
{
type Request = In;
type Response = Out::Item;
type Error = Out::Error;
type Transform = Apply<S, F, In, Out>;
type InitError = Err;
type Future = FutureResult<Self::Transform, Self::InitError>;
fn new_transform(&self, service: S) -> Self::Future {
ok(Apply::new(service, self.f.clone()))
}
}
impl<F, S, In, Out, Err> IntoTransform<FnTransform<F, S, In, Out, Err>, S> for F
where
S: Service,
F: FnMut(In, &mut S) -> Out + Clone,
Out: IntoFuture,
Out::Error: From<S::Error>,
{
fn into_transform(self) -> FnTransform<F, S, In, Out, Err> {
FnTransform::new(self)
}
}
impl<F, S, In, Out, Err> Clone for FnTransform<F, S, In, Out, Err>
where
F: FnMut(In, &mut S) -> Out + Clone,
Out: IntoFuture,
{
fn clone(&self) -> Self {
Self::new(self.f.clone())
}
}