Optional extractor extensions (#685)

* Fix inconsistent indentation in axum/Cargo.toml

* Make MatchedPath and OriginalUri extractors and logic for them optional

… they add some runtime cost to handling any request that goes through
a Router, which only makes sense if they actually get used.

Enable both features by default for convenience.

axum/Cargo.toml

@@ -11,11 +11,13 @@ readme = "README.md"
 repository = "https://github.com/tokio-rs/axum"
 
 [features]
-default = ["http1", "json", "tower-log"]
+default = ["http1", "json", "matched-path", "original-uri", "tower-log"]
 http1 = ["hyper/http1"]
 http2 = ["hyper/http2"]
 json = ["serde_json"]
+matched-path = []
 multipart = ["multer"]
+original-uri = []
 tower-log = ["tower/log"]
 ws = ["tokio-tungstenite", "sha-1", "base64"]
 
@@ -84,10 +86,10 @@ rustdoc-args = ["--cfg", "docsrs"]
 
 [package.metadata.playground]
 features = [
-  "http1",
-  "http2",
-  "json",
-  "multipart",
-  "tower",
-  "ws",
+    "http1",
+    "http2",
+    "json",
+    "multipart",
+    "tower",
+    "ws",
 ]

axum/src/extract/mod.rs

@@ -15,7 +15,6 @@ pub mod ws;
 mod content_length_limit;
 mod extension;
 mod form;
-mod matched_path;
 mod query;
 mod raw_query;
 mod request_parts;
@@ -31,17 +30,23 @@ pub use self::{
     extension::Extension,
     extractor_middleware::extractor_middleware,
     form::Form,
-    matched_path::MatchedPath,
     path::Path,
     query::Query,
     raw_query::RawQuery,
-    request_parts::OriginalUri,
     request_parts::{BodyStream, RawBody},
 };
 #[doc(no_inline)]
 #[cfg(feature = "json")]
 pub use crate::Json;
 
+#[cfg(feature = "matched-path")]
+mod matched_path;
+
+#[cfg(feature = "matched-path")]
+#[cfg_attr(docsrs, doc(cfg(feature = "matched-path")))]
+#[doc(inline)]
+pub use self::matched_path::MatchedPath;
+
 #[cfg(feature = "multipart")]
 #[cfg_attr(docsrs, doc(cfg(feature = "multipart")))]
 pub mod multipart;
@@ -51,6 +56,11 @@ pub mod multipart;
 #[doc(inline)]
 pub use self::multipart::Multipart;
 
+#[cfg(feature = "original-uri")]
+#[cfg_attr(docsrs, doc(cfg(feature = "original-uri")))]
+#[doc(inline)]
+pub use self::request_parts::OriginalUri;
+
 #[cfg(feature = "ws")]
 #[cfg_attr(docsrs, doc(cfg(feature = "ws")))]
 #[doc(inline)]

axum/src/extract/request_parts.rs

@@ -80,9 +80,11 @@ use sync_wrapper::SyncWrapper;
 /// # axum::Server::bind(&"".parse().unwrap()).serve(app.into_make_service()).await.unwrap();
 /// # };
 /// ```
+#[cfg(feature = "original-uri")]
 #[derive(Debug, Clone)]
 pub struct OriginalUri(pub Uri);
 
+#[cfg(feature = "original-uri")]
 #[async_trait]
 impl<B> FromRequest<B> for OriginalUri
 where

axum/src/lib.rs

@@ -375,12 +375,16 @@
 //! `http1` | Enables hyper's `http1` feature | Yes
 //! `http2` | Enables hyper's `http2` feature | No
 //! `json` | Enables the [`Json`] type and some similar convenience functionality | Yes
+//! `matched-path` | Enables capturing of every request's router path and the [`MatchedPath`] extractor | Yes
 //! `multipart` | Enables parsing `multipart/form-data` requests with [`Multipart`] | No
+//! `original-uri` | Enables capturing of every request's original URI and the [`OriginalUri`] extractor | Yes
 //! `tower-log` | Enables `tower`'s `log` feature | Yes
 //! `ws` | Enables WebSockets support via [`extract::ws`] | No
 //!
 //! [`TypedHeader`]: crate::extract::TypedHeader
+//! [`MatchedPath`]: crate::extract::MatchedPath
 //! [`Multipart`]: crate::extract::Multipart
+//! [`OriginalUri`]: crate::extract::OriginalUri
 //! [`tower`]: https://crates.io/crates/tower
 //! [`tower-http`]: https://crates.io/crates/tower-http
 //! [`tokio`]: http://crates.io/crates/tokio
@@ -392,7 +396,6 @@
 //! [examples]: https://github.com/tokio-rs/axum/tree/main/examples
 //! [`Router::merge`]: crate::routing::Router::merge
 //! [`axum::Server`]: hyper::server::Server
-//! [`OriginalUri`]: crate::extract::OriginalUri
 //! [`Service`]: tower::Service
 //! [`Service::poll_ready`]: tower::Service::poll_ready
 //! [`Service`'s]: tower::Service

axum/src/routing/mod.rs

@@ -3,13 +3,8 @@
 use self::{future::RouterFuture, not_found::NotFound};
 use crate::{
     body::{boxed, Body, Bytes, HttpBody},
-    extract::{
-        connect_info::{Connected, IntoMakeServiceWithConnectInfo},
-        MatchedPath, OriginalUri,
-    },
-    response::IntoResponse,
-    response::Redirect,
-    response::Response,
+    extract::connect_info::{Connected, IntoMakeServiceWithConnectInfo},
+    response::{Response, Redirect, IntoResponse},
     routing::strip_prefix::StripPrefix,
     util::{try_downcast, ByteStr, PercentDecodedByteStr},
     BoxError,
@@ -405,7 +400,10 @@ where
         let id = *match_.value;
         req.extensions_mut().insert(id);
 
+        #[cfg(feature = "matched-path")]
         if let Some(matched_path) = self.node.route_id_to_path.get(&id) {
+            use crate::extract::MatchedPath;
+
             let matched_path = if let Some(previous) = req.extensions_mut().get::<MatchedPath>() {
                 // a previous `MatchedPath` might exist if we're inside a nested Router
                 let previous = if let Some(previous) =
@@ -476,9 +474,14 @@ where
 
     #[inline]
     fn call(&mut self, mut req: Request<B>) -> Self::Future {
-        if req.extensions().get::<OriginalUri>().is_none() {
-            let original_uri = OriginalUri(req.uri().clone());
-            req.extensions_mut().insert(original_uri);
+        #[cfg(feature = "original-uri")]
+        {
+            use crate::extract::OriginalUri;
+
+            if req.extensions().get::<OriginalUri>().is_none() {
+                let original_uri = OriginalUri(req.uri().clone());
+                req.extensions_mut().insert(original_uri);
+            }
         }
 
         let path = req.uri().path().to_owned();