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use std::error::Error as StdError;
use futures::{Async, Future, IntoFuture, Poll};
use body::Payload;
use super::{MakeService, Service};
pub trait NewService {
type ReqBody: Payload;
type ResBody: Payload;
type Error: Into<Box<dyn StdError + Send + Sync>>;
type Service: Service<
ReqBody=Self::ReqBody,
ResBody=Self::ResBody,
Error=Self::Error,
>;
type Future: Future<Item=Self::Service, Error=Self::InitError>;
type InitError: Into<Box<dyn StdError + Send + Sync>>;
#[doc(hidden)]
fn poll_ready(&mut self) -> Poll<(), Self::InitError> {
Ok(Async::Ready(()))
}
fn new_service(&self) -> Self::Future;
}
impl<F, R, S> NewService for F
where
F: Fn() -> R,
R: IntoFuture<Item=S>,
R::Error: Into<Box<dyn StdError + Send + Sync>>,
S: Service,
{
type ReqBody = S::ReqBody;
type ResBody = S::ResBody;
type Error = S::Error;
type Service = S;
type Future = R::Future;
type InitError = R::Error;
fn new_service(&self) -> Self::Future {
(*self)().into_future()
}
}
impl<N, Ctx> MakeService<Ctx> for N
where
N: NewService,
{
type ReqBody = N::ReqBody;
type ResBody = N::ResBody;
type Error = N::Error;
type Service = N::Service;
type Future = N::Future;
type MakeError = N::InitError;
fn poll_ready(&mut self) -> Poll<(), Self::MakeError> {
NewService::poll_ready(self)
}
fn make_service(&mut self, _: Ctx) -> Self::Future {
self.new_service()
}
}