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use std::error::Error as StdError;
use std::fmt;
use futures::{Future, IntoFuture};
use body::Payload;
use super::Service;
pub trait MakeService<Ctx> {
type ReqBody: Payload;
type ResBody: Payload;
type Error: Into<Box<StdError + Send + Sync>>;
type Service: Service<
ReqBody=Self::ReqBody,
ResBody=Self::ResBody,
Error=Self::Error,
>;
type Future: Future<Item=Self::Service, Error=Self::MakeError>;
type MakeError: Into<Box<StdError + Send + Sync>>;
fn make_service(&mut self, ctx: Ctx) -> Self::Future;
}
pub fn make_service_fn<F, Ctx, Ret>(f: F) -> MakeServiceFn<F>
where
F: Fn(&Ctx) -> Ret,
Ret: IntoFuture,
{
MakeServiceFn {
f,
}
}
pub struct MakeServiceFn<F> {
f: F,
}
impl<'c, F, Ctx, Ret, ReqBody, ResBody> MakeService<&'c Ctx> for MakeServiceFn<F>
where
F: Fn(&Ctx) -> Ret,
Ret: IntoFuture,
Ret::Item: Service<ReqBody=ReqBody, ResBody=ResBody>,
Ret::Error: Into<Box<StdError + Send + Sync>>,
ReqBody: Payload,
ResBody: Payload,
{
type ReqBody = ReqBody;
type ResBody = ResBody;
type Error = <Ret::Item as Service>::Error;
type Service = Ret::Item;
type Future = Ret::Future;
type MakeError = Ret::Error;
fn make_service(&mut self, ctx: &'c Ctx) -> Self::Future {
(self.f)(ctx).into_future()
}
}
impl<F> fmt::Debug for MakeServiceFn<F> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("MakeServiceFn")
.finish()
}
}