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use std::marker::PhantomData;
use std::sync::Arc;
use futures::IntoFuture;
use tokio_service::{NewService, Service};
pub fn service_fn<F, R, S>(f: F) -> ServiceFn<F, R>
where
F: Fn(R) -> S,
S: IntoFuture,
{
ServiceFn {
f: f,
_req: PhantomData,
}
}
pub fn const_service<S>(service: S) -> ConstService<S> {
ConstService {
svc: Arc::new(service),
}
}
#[derive(Debug)]
pub struct ServiceFn<F, R> {
f: F,
_req: PhantomData<fn() -> R>,
}
impl<F, R, S> Service for ServiceFn<F, R>
where
F: Fn(R) -> S,
S: IntoFuture,
{
type Request = R;
type Response = S::Item;
type Error = S::Error;
type Future = S::Future;
fn call(&self, req: Self::Request) -> Self::Future {
(self.f)(req).into_future()
}
}
#[derive(Debug)]
pub struct ConstService<S> {
svc: Arc<S>,
}
impl<S> NewService for ConstService<S>
where
S: Service,
{
type Request = S::Request;
type Response = S::Response;
type Error = S::Error;
type Instance = Arc<S>;
fn new_service(&self) -> ::std::io::Result<Self::Instance> {
Ok(self.svc.clone())
}
}