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use {
crate::Service,
futures::{Async, IntoFuture, Poll},
std::marker::PhantomData,
};
pub fn service_fn<F, Req, R>(f: F) -> ServiceFn<F, Req, R>
where
F: FnMut(Req) -> R,
R: IntoFuture,
{
ServiceFn {
f,
_marker: PhantomData,
}
}
#[derive(Debug)]
pub struct ServiceFn<F, Req, R> {
f: F,
_marker: PhantomData<fn(Req) -> R>,
}
impl<F, Req, R> Service<Req> for ServiceFn<F, Req, R>
where
F: FnMut(Req) -> R,
R: IntoFuture,
{
type Response = R::Item;
type Error = R::Error;
type Future = R::Future;
#[inline]
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
#[inline]
fn call(&mut self, request: Req) -> Self::Future {
(self.f)(request).into_future()
}
}
pub fn service_fn_ok<F, Req, Res, E>(f: F) -> ServiceFnOk<F, Req, Res, E>
where
F: FnMut(Req) -> Res,
{
ServiceFnOk {
f,
_marker: PhantomData,
}
}
#[derive(Debug)]
pub struct ServiceFnOk<F, Req, Res, E> {
f: F,
_marker: PhantomData<fn(Req) -> (Res, E)>,
}
impl<F, Req, Res, E> Service<Req> for ServiceFnOk<F, Req, Res, E>
where
F: FnMut(Req) -> Res,
{
type Response = Res;
type Error = E;
type Future = futures::future::FutureResult<Self::Response, Self::Error>;
#[inline]
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
#[inline]
fn call(&mut self, request: Req) -> Self::Future {
futures::future::ok((self.f)(request))
}
}