#![deny(warnings)] extern crate futures; extern crate hyper; extern crate pretty_env_logger; extern crate tokio; extern crate url; use futures::{Future, Stream}; use hyper::{Body, Method, Request, Response, StatusCode}; use hyper::server::{Server, Service}; use std::collections::HashMap; use url::form_urlencoded; static INDEX: &[u8] = b"

Name:
Number:
"; static MISSING: &[u8] = b"Missing field"; static NOTNUMERIC: &[u8] = b"Number field is not numeric"; struct ParamExample; impl Service for ParamExample { type Request = Request; type Response = Response; type Error = hyper::Error; type Future = Box + Send>; fn call(&self, req: Request) -> Self::Future { match (req.method(), req.uri().path()) { (&Method::GET, "/") | (&Method::GET, "/post") => { Box::new(futures::future::ok(Response::new(INDEX.into()))) }, (&Method::POST, "/post") => { Box::new(req.into_body().concat2().map(|b| { // Parse the request body. form_urlencoded::parse // always succeeds, but in general parsing may // fail (for example, an invalid post of json), so // returning early with BadRequest may be // necessary. // // Warning: this is a simplified use case. In // principle names can appear multiple times in a // form, and the values should be rolled up into a // HashMap>. However in this // example the simpler approach is sufficient. let params = form_urlencoded::parse(b.as_ref()).into_owned().collect::>(); // Validate the request parameters, returning // early if an invalid input is detected. let name = if let Some(n) = params.get("name") { n } else { return Response::builder() .status(StatusCode::UNPROCESSABLE_ENTITY) .body(MISSING.into()) .unwrap(); }; let number = if let Some(n) = params.get("number") { if let Ok(v) = n.parse::() { v } else { return Response::builder() .status(StatusCode::UNPROCESSABLE_ENTITY) .body(NOTNUMERIC.into()) .unwrap(); } } else { return Response::builder() .status(StatusCode::UNPROCESSABLE_ENTITY) .body(MISSING.into()) .unwrap(); }; // Render the response. This will often involve // calls to a database or web service, which will // require creating a new stream for the response // body. Since those may fail, other error // responses such as InternalServiceError may be // needed here, too. let body = format!("Hello {}, your number is {}", name, number); Response::new(body.into()) })) }, _ => { Box::new(futures::future::ok(Response::builder() .status(StatusCode::NOT_FOUND) .body(Body::empty()) .unwrap())) } } } } fn main() { pretty_env_logger::init(); let addr = ([127, 0, 0, 1], 1337).into(); let server = Server::bind(&addr) .serve(|| Ok(ParamExample)) .map_err(|e| eprintln!("server error: {}", e)); tokio::run(server); }