Allow Error: Into<Infallible> for Route::{layer, route_layer} (#948)

* Allow `Error: Into<Infallible>` for `Route::{layer, route_layer}` (#924) * Allow `Error: Into<Infallible>` for `Route::{layer, route_layer}` Fixes #922 * changelog * fixup changelog
tokio-rs · Jun 17, 2022 · 5646264 · 5646264
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diff --git a/axum/CHANGELOG.md b/axum/CHANGELOG.md
@@ -11,14 +11,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   extractor ([#1078])
 - **added:** Implement `IntoResponse` for `Form` ([#1095])
 - **change:** axum's MSRV is now 1.56 ([#1098])
+- **breaking:** Remove `extractor_middleware` which was previously deprecated.
+  Use `axum::middleware::from_extractor` instead ([#1077])
+- **breaking:** Allow `Error: Into<Infallible>` for `Route::{layer, route_layer}` ([#924])
 - **breaking:** Remove `extractor_middleware` which was previously deprecated.
   Use `axum::middleware::from_extractor` instead ([#1077])
 
 [#1077]: https://github.com/tokio-rs/axum/pull/1077
 [#1078]: https://github.com/tokio-rs/axum/pull/1078
 [#1078]: https://github.com/tokio-rs/axum/pull/1078
+[#1078]: https://github.com/tokio-rs/axum/pull/1078
 [#1095]: https://github.com/tokio-rs/axum/pull/1095
 [#1098]: https://github.com/tokio-rs/axum/pull/1098
+[#924]: https://github.com/tokio-rs/axum/pull/924
 
 # 0.5.7 (08. June, 2022)
 

diff --git a/axum/src/routing/mod.rs b/axum/src/routing/mod.rs
@@ -291,15 +291,15 @@ where
     pub fn layer<L, NewReqBody, NewResBody>(self, layer: L) -> Router<NewReqBody>
     where
         L: Layer<Route<B>>,
-        L::Service: Service<Request<NewReqBody>, Response = Response<NewResBody>, Error = Infallible>
-            + Clone
-            + Send
-            + 'static,
+        L::Service:
+            Service<Request<NewReqBody>, Response = Response<NewResBody>> + Clone + Send + 'static,
+        <L::Service as Service<Request<NewReqBody>>>::Error: Into<Infallible> + 'static,
         <L::Service as Service<Request<NewReqBody>>>::Future: Send + 'static,
         NewResBody: HttpBody<Data = Bytes> + Send + 'static,
         NewResBody::Error: Into<BoxError>,
     {
         let layer = ServiceBuilder::new()
+            .map_err(Into::into)
             .layer(MapResponseBodyLayer::new(boxed))
             .layer(layer)
             .into_inner();
@@ -332,15 +332,14 @@ where
     pub fn route_layer<L, NewResBody>(self, layer: L) -> Self
     where
         L: Layer<Route<B>>,
-        L::Service: Service<Request<B>, Response = Response<NewResBody>, Error = Infallible>
-            + Clone
-            + Send
-            + 'static,
+        L::Service: Service<Request<B>, Response = Response<NewResBody>> + Clone + Send + 'static,
+        <L::Service as Service<Request<B>>>::Error: Into<Infallible> + 'static,
         <L::Service as Service<Request<B>>>::Future: Send + 'static,
         NewResBody: HttpBody<Data = Bytes> + Send + 'static,
         NewResBody::Error: Into<BoxError>,
     {
         let layer = ServiceBuilder::new()
+            .map_err(Into::into)
             .layer(MapResponseBodyLayer::new(boxed))
             .layer(layer)
             .into_inner();