static dispatch redirect future

awc/src/builder.rs

@@ -18,7 +18,6 @@ use crate::{Client, ClientConfig, ConnectRequest, ConnectResponse, ConnectorServ
 /// This type can be used to construct an instance of `Client` through a
 /// builder-like pattern.
 pub struct ClientBuilder<S = (), Io = (), M = ()> {
-    middleware: M,
     default_headers: bool,
     max_http_version: Option<http::Version>,
     stream_window_size: Option<u32>,
@@ -26,6 +25,7 @@ pub struct ClientBuilder<S = (), Io = (), M = ()> {
     headers: HeaderMap,
     timeout: Option<Duration>,
     connector: Connector<S, Io>,
+    middleware: M,
 }
 
 impl ClientBuilder {

awc/src/middleware/redirect.rs

@@ -1,14 +1,19 @@
-use std::rc::Rc;
+use std::{
+    future::Future,
+    net::SocketAddr,
+    pin::Pin,
+    rc::Rc,
+    task::{Context, Poll},
+};
 
-use actix_http::client::InvalidUrl;
 use actix_http::{
     body::Body,
-    client::SendRequestError,
+    client::{InvalidUrl, SendRequestError},
     http::{header, StatusCode, Uri},
     RequestHead, RequestHeadType,
 };
 use actix_service::Service;
-use futures_core::future::LocalBoxFuture;
+use futures_core::ready;
 
 use super::Transform;
 
@@ -62,40 +67,86 @@ where
 {
     type Response = S::Response;
     type Error = S::Error;
-    type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
+    type Future = RedirectServiceFuture<S>;
 
     actix_service::forward_ready!(connector);
 
     fn call(&self, req: ConnectRequest) -> Self::Future {
-        let connector = self.connector.clone();
-        let mut max_redirect_times = self.max_redirect_times;
-
-        Box::pin(async move {
         match req {
-                // tunnel request is skipped.
             ConnectRequest::Tunnel(head, addr) => {
-                    return connector.call(ConnectRequest::Tunnel(head, addr)).await
+                let fut = self.connector.call(ConnectRequest::Tunnel(head, addr));
+                RedirectServiceFuture::Tunnel { fut }
             }
-                ConnectRequest::Client(mut head, mut body, addr) => {
+            ConnectRequest::Client(head, body, addr) => {
+                let connector = self.connector.clone();
+                let max_redirect_times = self.max_redirect_times;
+
                 // backup the uri for reuse schema and authority.
                 let uri = match head {
                     RequestHeadType::Owned(ref head) => head.uri.clone(),
                     RequestHeadType::Rc(ref head, ..) => head.uri.clone(),
                 };
 
-                    loop {
-                        let res = connector
-                            .call(ConnectRequest::Client(head, body, addr.clone()))
-                            .await?;
-                        match res {
+                let fut = connector.call(ConnectRequest::Client(head, body, addr));
+
+                RedirectServiceFuture::Client {
+                    fut,
+                    max_redirect_times,
+                    uri: Some(uri),
+                    addr,
+                    connector: Some(connector),
+                }
+            }
+        }
+    }
+}
+
+pin_project_lite::pin_project! {
+    #[project = RedirectServiceProj]
+    pub enum RedirectServiceFuture<S>
+    where
+        S: Service<ConnectRequest, Response = ConnectResponse, Error = SendRequestError>,
+        S: 'static
+    {
+        Tunnel { #[pin] fut: S::Future },
+        Client {
+            #[pin]
+            fut: S::Future,
+            max_redirect_times: u8,
+            uri: Option<Uri>,
+            addr: Option<SocketAddr>,
+            connector: Option<Rc<S>>
+        }
+    }
+}
+
+impl<S> Future for RedirectServiceFuture<S>
+where
+    S: Service<ConnectRequest, Response = ConnectResponse, Error = SendRequestError> + 'static,
+{
+    type Output = Result<ConnectResponse, SendRequestError>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        match self.as_mut().project() {
+            RedirectServiceProj::Tunnel { fut } => fut.poll(cx),
+            RedirectServiceProj::Client {
+                fut,
+                max_redirect_times,
+                uri,
+                addr,
+                connector,
+            } => {
+                match ready!(fut.poll(cx))? {
                     ConnectResponse::Client(res) => match res.head().status {
                         StatusCode::MOVED_PERMANENTLY
                         | StatusCode::FOUND
                         | StatusCode::SEE_OTHER
                         | StatusCode::TEMPORARY_REDIRECT
                         | StatusCode::PERMANENT_REDIRECT
-                                    if max_redirect_times > 0 =>
+                            if *max_redirect_times > 0 =>
                         {
+                            let uri = uri.take().unwrap();
+
                             // rebuild uri from the location header value.
                             let uri = res
                                 .headers()
@@ -106,33 +157,45 @@ where
                                         .authority(uri.authority().cloned().unwrap())
                                         .path_and_query(value.as_bytes())
                                 })
-                                        .ok_or(SendRequestError::Url(
-                                            InvalidUrl::MissingScheme,
-                                        ))?
+                                .ok_or(SendRequestError::Url(InvalidUrl::MissingScheme))?
                                 .build()?;
 
-                                    // use a new request head.
-                                    let mut head_new = RequestHead::default();
-                                    head_new.uri = uri;
+                            let addr = addr.take();
+                            let connector = connector.take();
+                            let mut max_redirect_times = *max_redirect_times;
 
-                                    head = RequestHeadType::Owned(head_new);
+                            // use a new request head.
+                            let mut head = RequestHead::default();
+                            head.uri = uri.clone();
+                            let head = RequestHeadType::Owned(head);
 
                             // throw body
-                                    body = Body::None;
+                            let body = Body::None;
 
                             max_redirect_times -= 1;
+
+                            let fut = connector
+                                .as_ref()
+                                .unwrap()
+                                .call(ConnectRequest::Client(head, body, addr));
+
+                            self.as_mut().set(RedirectServiceFuture::Client {
+                                fut,
+                                max_redirect_times,
+                                uri: Some(uri),
+                                addr,
+                                connector,
+                            });
+
+                            self.poll(cx)
                         }
-                                _ => return Ok(ConnectResponse::Client(res)),
+                        _ => Poll::Ready(Ok(ConnectResponse::Client(res))),
                     },
-                            _ => unreachable!(
-                                " ConnectRequest::Tunnel is not handled by Redirect"
-                            ),
+                    _ => unreachable!("ConnectRequest::Tunnel is not handled by Redirect"),
                 }
             }
         }
     }
-        })
-    }
 }
 
 #[cfg(test)]
@@ -146,6 +209,7 @@ mod tests {
     #[actix_rt::test]
     async fn test_basic_redirect() {
         let client = ClientBuilder::new()
+            .connector(crate::Connector::new())
             .wrap(RedirectMiddleware::new().max_redirect_times(10))
             .finish();
 
@@ -172,6 +236,7 @@ mod tests {
     async fn test_redirect_limit() {
         let client = ClientBuilder::new()
             .wrap(RedirectMiddleware::new().max_redirect_times(1))
+            .connector(crate::Connector::new())
             .finish();
 
         let srv = start(|| {