Clean up constructors for future newtypes (#415)

src/routing/future.rs

@@ -1,11 +1,12 @@
 //! Future types.
 
 use crate::body::BoxBody;
+use futures_util::future::Either;
 use http::{Request, Response};
 use pin_project_lite::pin_project;
 use std::{
     convert::Infallible,
-    future::Future,
+    future::{ready, Future},
     pin::Pin,
     task::{Context, Poll},
 };
@@ -23,15 +24,11 @@ opaque_future! {
 
 impl<B> RouterFuture<B> {
     pub(super) fn from_oneshot(future: Oneshot<super::Route<B>, Request<B>>) -> Self {
-        Self {
-            future: futures_util::future::Either::Left(future),
-        }
+        Self::new(Either::Left(future))
     }
 
     pub(super) fn from_response(response: Response<BoxBody>) -> Self {
-        RouterFuture {
-            future: futures_util::future::Either::Right(std::future::ready(Ok(response))),
-        }
+        RouterFuture::new(Either::Right(ready(Ok(response))))
     }
 }
 

src/routing/mod.rs

@@ -928,9 +928,7 @@ where
             .body(crate::body::empty())
             .unwrap();
 
-        MethodNotAllowedFuture {
-            future: ready(Ok(res)),
-        }
+        MethodNotAllowedFuture::new(ready(Ok(res)))
     }
 }
 
@@ -1019,9 +1017,7 @@ where
     }
 
     fn call(&mut self, _target: T) -> Self::Future {
-        future::MakeRouteServiceFuture {
-            future: ready(Ok(self.service.clone())),
-        }
+        future::MakeRouteServiceFuture::new(ready(Ok(self.service.clone())))
     }
 }
 
@@ -1054,9 +1050,7 @@ impl<B> Service<Request<B>> for Route<B> {
 
     #[inline]
     fn call(&mut self, req: Request<B>) -> Self::Future {
-        RouteFuture {
-            future: self.0.call(req),
-        }
+        RouteFuture::new(self.0.call(req))
     }
 }