#![deny(warnings)] extern crate futures; extern crate hyper; use futures::future; use hyper::rt::{Future, Stream}; use hyper::service::service_fn; use hyper::{Body, Method, Request, Response, Server, StatusCode}; /// We need to return different futures depending on the route matched, /// and we can do that with an enum, such as `futures::Either`, or with /// trait objects. /// /// A boxed Future (trait object) is used as it is easier to understand /// and extend with more types. Advanced users could switch to `Either`. type BoxFut = Box, Error = hyper::Error> + Send>; /// This is our service handler. It receives a Request, routes on its /// path, and returns a Future of a Response. fn echo(req: Request) -> BoxFut { let mut response = Response::new(Body::empty()); match (req.method(), req.uri().path()) { // Serve some instructions at / (&Method::GET, "/") => { *response.body_mut() = Body::from("Try POSTing data to /echo"); } // Simply echo the body back to the client. (&Method::POST, "/echo") => { *response.body_mut() = req.into_body(); } // Convert to uppercase before sending back to client. (&Method::POST, "/echo/uppercase") => { let mapping = req.into_body().map(|chunk| { chunk .iter() .map(|byte| byte.to_ascii_uppercase()) .collect::>() }); *response.body_mut() = Body::wrap_stream(mapping); } // 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. So, this returns a different // future, waiting on concatenating the full body, so that // it can be reversed. Only then can we return a `Response`. (&Method::POST, "/echo/reversed") => { let reversed = req.into_body().concat2().map(move |chunk| { let body = chunk.iter().rev().cloned().collect::>(); *response.body_mut() = Body::from(body); response }); return Box::new(reversed); } // The 404 Not Found route... _ => { *response.status_mut() = StatusCode::NOT_FOUND; } }; Box::new(future::ok(response)) } fn main() { let addr = ([127, 0, 0, 1], 3000).into(); let server = Server::bind(&addr) .serve(|| service_fn(echo)) .map_err(|e| eprintln!("server error: {}", e)); println!("Listening on http://{}", addr); hyper::rt::run(server); }