//#![deny(warnings)] use hyper::{Body, Method, Request, Response, Server, StatusCode}; use hyper::service::{make_service_fn, service_fn}; use futures_util::TryStreamExt; /// This is our service handler. It receives a Request, routes on its /// path, and returns a Future of a Response. async fn echo(req: Request) -> Result, hyper::Error> { match (req.method(), req.uri().path()) { // Serve some instructions at / (&Method::GET, "/") => { Ok(Response::new(Body::from("Try POSTing data to /echo such as: `curl localhost:3000/echo -XPOST -d 'hello world'`"))) } // Simply echo the body back to the client. (&Method::POST, "/echo") => { Ok(Response::new(req.into_body())) } // Convert to uppercase before sending back to client using a stream. (&Method::POST, "/echo/uppercase") => { let chunk_stream = req.into_body().map_ok(|chunk| { chunk .iter() .map(|byte| byte.to_ascii_uppercase()) .collect::>() }); Ok(Response::new(Body::wrap_stream(chunk_stream))) } // Reverse the entire body before sending back to the client. // // Since we don't know the end yet, we can't simply stream // the chunks as they arrive as we did with the above uppercase endpoint. // So here we do `.await` on the future, waiting on concatenating the full body, // then afterwards the content can be reversed. Only then can we return a `Response`. (&Method::POST, "/echo/reversed") => { let whole_chunk = req.into_body().try_concat().await; let reversed_chunk = whole_chunk.map(move |chunk| { chunk.iter().rev().cloned().collect::>() })?; Ok(Response::new(Body::from(reversed_chunk))) } // Return the 404 Not Found for other routes. _ => { let mut not_found = Response::default(); *not_found.status_mut() = StatusCode::NOT_FOUND; Ok(not_found) } } } #[tokio::main] async fn main() -> Result<(), Box> { let addr = ([127, 0, 0, 1], 3000).into(); let service = make_service_fn(|_| { async { Ok::<_, hyper::Error>(service_fn(echo)) } }); let server = Server::bind(&addr) .serve(service); println!("Listening on http://{}", addr); server.await?; Ok(()) }