re-add request body in middleware example

Cargo.lock

@@ -4103,6 +4103,7 @@ dependencies = [
 name = "middleware-example"
 version = "1.0.0"
 dependencies = [
+ "actix-http",
  "actix-web",
  "env_logger",
  "futures-util",

middleware/middleware/Cargo.toml

@@ -5,6 +5,8 @@ edition = "2021"
 
 [dependencies]
 actix-web = "4"
+actix-http = "3"
+
 env_logger = "0.10"
 futures-util = { version = "0.3.17", default-features = false, features = ["std"] }
 log = "0.4"

middleware/middleware/src/main.rs

@@ -26,7 +26,8 @@ async fn main() -> std::io::Result<()> {
                     res
                 })
             })
-            .service(web::resource("/login").to(|| async {
+            .service(web::resource("/login").to(|body: String| async move {
+                println!("request body (handler): {body}");
                 "You are on /login. Go to src/redirect.rs to change this behavior."
             }))
             .service(
@@ -36,6 +37,7 @@ async fn main() -> std::io::Result<()> {
             )
     })
     .bind(("127.0.0.1", 8080))?
+    .workers(1)
     .run()
     .await
 }

middleware/middleware/src/read_request_body.rs

@@ -3,12 +3,12 @@ use std::{
     rc::Rc,
 };
 
+use actix_http::h1;
 use actix_web::{
     dev::{self, Service, ServiceRequest, ServiceResponse, Transform},
-    web::BytesMut,
-    Error, HttpMessage,
+    web, Error,
 };
-use futures_util::{future::LocalBoxFuture, stream::StreamExt};
+use futures_util::future::LocalBoxFuture;
 
 pub struct Logging;
 
@@ -52,13 +52,13 @@ where
         let svc = self.service.clone();
 
         Box::pin(async move {
-            let mut body = BytesMut::new();
-            let mut stream = req.take_payload();
-            while let Some(chunk) = stream.next().await {
-                body.extend_from_slice(&chunk?);
-            }
+            // extract bytes from request body
+            let body = req.extract::<web::Bytes>().await.unwrap();
+            println!("request body (middleware): {body:?}");
+
+            // re-insert body back into request to be used by handlers
+            req.set_payload(bytes_to_payload(body));
 
-            println!("request body: {body:?}");
             let res = svc.call(req).await?;
 
             println!("response: {:?}", res.headers());
@@ -66,3 +66,9 @@ where
         })
     }
 }
+
+fn bytes_to_payload(buf: web::Bytes) -> dev::Payload {
+    let (_, mut pl) = h1::Payload::create(true);
+    pl.unread_data(buf);
+    dev::Payload::from(pl)
+}