mirror of
https://github.com/tokio-rs/axum.git
synced 2026-08-21 00:00:14 +02:00
306 lines
7.9 KiB
Rust
306 lines
7.9 KiB
Rust
use crate::{
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body::{Body, BoxBody},
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extract::FromRequest,
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response::IntoResponse,
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routing::{BoxResponseBody, EmptyRouter, MethodFilter},
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service::HandleError,
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};
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use async_trait::async_trait;
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use bytes::Bytes;
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use futures_util::future;
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use http::{Request, Response};
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use std::{
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convert::Infallible,
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future::Future,
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marker::PhantomData,
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task::{Context, Poll},
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};
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use tower::{util::Oneshot, BoxError, Layer, Service, ServiceExt};
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pub fn get<H, T>(handler: H) -> OnMethod<IntoService<H, T>, EmptyRouter>
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where
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H: Handler<T>,
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{
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on(MethodFilter::Get, handler)
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}
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pub fn post<H, T>(handler: H) -> OnMethod<IntoService<H, T>, EmptyRouter>
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where
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H: Handler<T>,
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{
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on(MethodFilter::Post, handler)
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}
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pub fn on<H, T>(method: MethodFilter, handler: H) -> OnMethod<IntoService<H, T>, EmptyRouter>
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where
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H: Handler<T>,
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{
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OnMethod {
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method,
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svc: handler.into_service(),
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fallback: EmptyRouter,
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}
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}
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mod sealed {
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#![allow(unreachable_pub)]
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pub trait HiddentTrait {}
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pub struct Hidden;
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impl HiddentTrait for Hidden {}
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}
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#[async_trait]
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pub trait Handler<In>: Sized {
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// This seals the trait. We cannot use the regular "sealed super trait" approach
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// due to coherence.
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#[doc(hidden)]
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type Sealed: sealed::HiddentTrait;
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async fn call(self, req: Request<Body>) -> Response<BoxBody>;
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fn layer<L>(self, layer: L) -> Layered<L::Service, In>
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where
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L: Layer<IntoService<Self, In>>,
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{
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Layered::new(layer.layer(IntoService::new(self)))
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}
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fn into_service(self) -> IntoService<Self, In> {
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IntoService::new(self)
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}
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}
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#[async_trait]
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impl<F, Fut, Res> Handler<()> for F
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where
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F: FnOnce(Request<Body>) -> Fut + Send + Sync,
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Fut: Future<Output = Res> + Send,
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Res: IntoResponse,
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{
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type Sealed = sealed::Hidden;
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async fn call(self, req: Request<Body>) -> Response<BoxBody> {
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self(req).await.into_response().map(BoxBody::new)
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}
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}
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macro_rules! impl_handler {
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() => {};
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( $head:ident, $($tail:ident),* $(,)? ) => {
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#[async_trait]
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#[allow(non_snake_case)]
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impl<F, Fut, Res, $head, $($tail,)*> Handler<($head, $($tail,)*)> for F
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where
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F: FnOnce(Request<Body>, $head, $($tail,)*) -> Fut + Send + Sync,
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Fut: Future<Output = Res> + Send,
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Res: IntoResponse,
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$head: FromRequest + Send,
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$( $tail: FromRequest + Send, )*
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{
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type Sealed = sealed::Hidden;
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async fn call(self, mut req: Request<Body>) -> Response<BoxBody> {
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let $head = match $head::from_request(&mut req).await {
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Ok(value) => value,
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Err(rejection) => return rejection.into_response().map(BoxBody::new),
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};
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$(
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let $tail = match $tail::from_request(&mut req).await {
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Ok(value) => value,
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Err(rejection) => return rejection.into_response().map(BoxBody::new),
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};
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)*
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let res = self(req, $head, $($tail,)*).await;
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res.into_response().map(BoxBody::new)
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}
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}
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impl_handler!($($tail,)*);
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};
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}
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impl_handler!(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16);
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pub struct Layered<S, T> {
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svc: S,
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_input: PhantomData<fn() -> T>,
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}
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impl<S, T> Clone for Layered<S, T>
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where
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S: Clone,
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{
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fn clone(&self) -> Self {
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Self::new(self.svc.clone())
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}
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}
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#[async_trait]
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impl<S, T, B> Handler<T> for Layered<S, T>
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where
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S: Service<Request<Body>, Response = Response<B>> + Send,
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// S::Response: IntoResponse,
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S::Error: IntoResponse,
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S::Future: Send,
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B: http_body::Body<Data = Bytes> + Send + Sync + 'static,
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B::Error: Into<BoxError> + Send + Sync + 'static,
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{
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type Sealed = sealed::Hidden;
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async fn call(self, req: Request<Body>) -> Response<BoxBody> {
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match self
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.svc
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.oneshot(req)
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.await
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.map_err(IntoResponse::into_response)
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{
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Ok(res) => res.map(BoxBody::new),
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Err(res) => res.map(BoxBody::new),
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}
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}
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}
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impl<S, T> Layered<S, T> {
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pub(crate) fn new(svc: S) -> Self {
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Self {
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svc,
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_input: PhantomData,
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}
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}
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pub fn handle_error<F, B, Res>(self, f: F) -> Layered<HandleError<S, F>, T>
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where
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S: Service<Request<Body>, Response = Response<B>>,
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F: FnOnce(S::Error) -> Res,
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Res: IntoResponse,
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{
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let svc = HandleError::new(self.svc, f);
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Layered::new(svc)
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}
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}
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pub struct IntoService<H, T> {
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handler: H,
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_marker: PhantomData<fn() -> T>,
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}
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impl<H, T> IntoService<H, T> {
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fn new(handler: H) -> Self {
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Self {
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handler,
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_marker: PhantomData,
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}
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}
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}
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impl<H, T> Clone for IntoService<H, T>
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where
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H: Clone,
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{
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fn clone(&self) -> Self {
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Self {
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handler: self.handler.clone(),
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_marker: PhantomData,
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}
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}
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}
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impl<H, T> Service<Request<Body>> for IntoService<H, T>
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where
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H: Handler<T> + Clone + Send + 'static,
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{
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type Response = Response<BoxBody>;
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type Error = Infallible;
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type Future = future::BoxFuture<'static, Result<Self::Response, Self::Error>>;
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fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
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// `IntoService` can only be constructed from async functions which are always ready, or from
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// `Layered` which bufferes in `<Layered as Handler>::call` and is therefore also always
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// ready.
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Poll::Ready(Ok(()))
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}
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fn call(&mut self, req: Request<Body>) -> Self::Future {
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let handler = self.handler.clone();
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Box::pin(async move {
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let res = Handler::call(handler, req).await;
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Ok(res)
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})
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}
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}
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#[derive(Clone)]
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pub struct OnMethod<S, F> {
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pub(crate) method: MethodFilter,
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pub(crate) svc: S,
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pub(crate) fallback: F,
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}
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impl<S, F> OnMethod<S, F> {
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pub fn get<H, T>(self, handler: H) -> OnMethod<IntoService<H, T>, Self>
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where
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H: Handler<T>,
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{
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self.on(MethodFilter::Get, handler)
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}
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pub fn post<H, T>(self, handler: H) -> OnMethod<IntoService<H, T>, Self>
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where
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H: Handler<T>,
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{
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self.on(MethodFilter::Post, handler)
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}
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pub fn on<H, T>(self, method: MethodFilter, handler: H) -> OnMethod<IntoService<H, T>, Self>
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where
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H: Handler<T>,
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{
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OnMethod {
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method,
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svc: handler.into_service(),
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fallback: self,
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}
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}
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}
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// this is identical to `routing::OnMethod`'s implementation. Would be nice to find a way to clean
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// that up, but not sure its possible.
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impl<S, F, SB, FB> Service<Request<Body>> for OnMethod<S, F>
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where
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S: Service<Request<Body>, Response = Response<SB>, Error = Infallible> + Clone,
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SB: http_body::Body<Data = Bytes> + Send + Sync + 'static,
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SB::Error: Into<BoxError>,
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F: Service<Request<Body>, Response = Response<FB>, Error = Infallible> + Clone,
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FB: http_body::Body<Data = Bytes> + Send + Sync + 'static,
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FB::Error: Into<BoxError>,
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{
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type Response = Response<BoxBody>;
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type Error = Infallible;
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#[allow(clippy::type_complexity)]
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type Future = future::Either<
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BoxResponseBody<Oneshot<S, Request<Body>>>,
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BoxResponseBody<Oneshot<F, Request<Body>>>,
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>;
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fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
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Poll::Ready(Ok(()))
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}
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fn call(&mut self, req: Request<Body>) -> Self::Future {
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if self.method.matches(req.method()) {
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let response_future = self.svc.clone().oneshot(req);
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future::Either::Left(BoxResponseBody(response_future))
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} else {
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let response_future = self.fallback.clone().oneshot(req);
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future::Either::Right(BoxResponseBody(response_future))
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}
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}
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}
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