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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| //! Middleware to override status codes. | ||
| //! | ||
| //! # Example | ||
| //! | ||
| //! ``` | ||
| //! use tower_http::set_status::SetStatusLayer; | ||
| //! use http::{Request, Response, StatusCode}; | ||
| //! use hyper::Body; | ||
| //! use std::{iter::once, convert::Infallible}; | ||
| //! use tower::{ServiceBuilder, Service, ServiceExt}; | ||
| //! | ||
| //! async fn handle(req: Request<Body>) -> Result<Response<Body>, Infallible> { | ||
| //! // ... | ||
| //! # Ok(Response::new(Body::empty())) | ||
| //! } | ||
| //! | ||
| //! # #[tokio::main] | ||
| //! # async fn main() -> Result<(), Box<dyn std::error::Error>> { | ||
| //! async fn handle(req: Request<Body>) -> Result<Response<Body>, Infallible> { | ||
| //! // ... | ||
| //! # Ok(Response::new(Body::empty())) | ||
| //! } | ||
| //! | ||
| //! let mut service = ServiceBuilder::new() | ||
| //! // change the status to `404 Not Found` regardless what the inner service returns | ||
| //! .layer(SetStatusLayer::new(StatusCode::NOT_FOUND)) | ||
| //! .service_fn(handle); | ||
| //! | ||
| //! // Call the service. | ||
| //! let request = Request::builder().body(Body::empty())?; | ||
| //! | ||
| //! let response = service.ready().await?.call(request).await?; | ||
| //! | ||
| //! assert_eq!(response.status(), StatusCode::NOT_FOUND); | ||
| //! # | ||
| //! # Ok(()) | ||
| //! # } | ||
| //! ``` | ||
| use http::{Request, Response, StatusCode}; | ||
| use pin_project_lite::pin_project; | ||
| use std::{ | ||
| future::Future, | ||
| pin::Pin, | ||
| task::{Context, Poll}, | ||
| }; | ||
| use tower_layer::Layer; | ||
| use tower_service::Service; | ||
|
|
||
| /// Layer that applies [`SetStatus`] which overrides the status codes. | ||
| #[derive(Debug, Clone, Copy)] | ||
| pub struct SetStatusLayer { | ||
| status: StatusCode, | ||
| } | ||
|
|
||
| impl SetStatusLayer { | ||
| /// Create a new [`SetStatusLayer`]. | ||
| /// | ||
| /// The response status code will be `status` regardless of what the inner service returns. | ||
| pub fn new(status: StatusCode) -> Self { | ||
| SetStatusLayer { status } | ||
| } | ||
| } | ||
|
|
||
| impl<S> Layer<S> for SetStatusLayer { | ||
| type Service = SetStatus<S>; | ||
|
|
||
| fn layer(&self, inner: S) -> Self::Service { | ||
| SetStatus::new(inner, self.status) | ||
| } | ||
| } | ||
|
|
||
| /// Middleware to override status codes. | ||
| /// | ||
| /// See the [module docs](self) for more details. | ||
| #[derive(Debug, Clone, Copy)] | ||
| pub struct SetStatus<S> { | ||
| inner: S, | ||
| status: StatusCode, | ||
| } | ||
|
|
||
| impl<S> SetStatus<S> { | ||
| /// Create a new [`SetStatus`]. | ||
| /// | ||
| /// The response status code will be `status` regardless of what the inner service returns. | ||
| pub fn new(inner: S, status: StatusCode) -> Self { | ||
| Self { status, inner } | ||
| } | ||
|
|
||
| define_inner_service_accessors!(); | ||
|
|
||
| /// Returns a new [`Layer`] that wraps services with a `SetStatus` middleware. | ||
| /// | ||
| /// [`Layer`]: tower_layer::Layer | ||
| pub fn layer(status: StatusCode) -> SetStatusLayer { | ||
| SetStatusLayer::new(status) | ||
| } | ||
| } | ||
|
|
||
| impl<S, ReqBody, ResBody> Service<Request<ReqBody>> for SetStatus<S> | ||
| where | ||
| S: Service<Request<ReqBody>, Response = Response<ResBody>>, | ||
| { | ||
| type Response = S::Response; | ||
| type Error = S::Error; | ||
| type Future = ResponseFuture<S::Future>; | ||
|
|
||
| fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
| self.inner.poll_ready(cx) | ||
| } | ||
|
|
||
| fn call(&mut self, req: Request<ReqBody>) -> Self::Future { | ||
| ResponseFuture { | ||
| inner: self.inner.call(req), | ||
| status: Some(self.status), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pin_project! { | ||
| /// Response future for [`SetStatus`]. | ||
| pub struct ResponseFuture<F> { | ||
| #[pin] | ||
| inner: F, | ||
| status: Option<StatusCode>, | ||
| } | ||
| } | ||
|
|
||
| impl<F, B, E> Future for ResponseFuture<F> | ||
| where | ||
| F: Future<Output = Result<Response<B>, E>>, | ||
| { | ||
| type Output = F::Output; | ||
|
|
||
| fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> { | ||
| let this = self.project(); | ||
| let mut response = futures_core::ready!(this.inner.poll(cx)?); | ||
| *response.status_mut() = this.status.take().expect("future polled after completion"); | ||
| Poll::Ready(Ok(response)) | ||
| } | ||
| } |