docs(examples): Update params example to use async await
This commit is contained in:
messense
Sean McArthur
@@ -1,96 +1,101 @@
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#![deny(warnings)]
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extern crate futures;
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#![feature(async_await)]
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// #![deny(warnings)] // FIXME: https://github.com/rust-lang/rust/issues/62411
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extern crate hyper;
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extern crate pretty_env_logger;
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extern crate url;
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use futures::{future, Future, Stream};
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use hyper::{Body, Method, Request, Response, Server, StatusCode};
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use hyper::service::service_fn;
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use hyper::service::{service_fn, make_service_fn};
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use std::collections::HashMap;
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use url::form_urlencoded;
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use futures_util::TryStreamExt;
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static INDEX: &[u8] = b"<html><body><form action=\"post\" method=\"post\">Name: <input type=\"text\" name=\"name\"><br>Number: <input type=\"text\" name=\"number\"><br><input type=\"submit\"></body></html>";
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static MISSING: &[u8] = b"Missing field";
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static NOTNUMERIC: &[u8] = b"Number field is not numeric";
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// Using service_fn, we can turn this function into a `Service`.
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fn param_example(req: Request<Body>) -> Box<dyn Future<Item=Response<Body>, Error=hyper::Error> + Send> {
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async fn param_example(req: Request<Body>) -> Result<Response<Body>, hyper::Error> {
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match (req.method(), req.uri().path()) {
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(&Method::GET, "/") | (&Method::GET, "/post") => {
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Box::new(future::ok(Response::new(INDEX.into())))
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Ok(Response::new(INDEX.into()))
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},
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(&Method::POST, "/post") => {
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Box::new(req.into_body().concat2().map(|b| {
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// Parse the request body. form_urlencoded::parse
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// always succeeds, but in general parsing may
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// fail (for example, an invalid post of json), so
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// returning early with BadRequest may be
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// necessary.
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//
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// Warning: this is a simplified use case. In
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// principle names can appear multiple times in a
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// form, and the values should be rolled up into a
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// HashMap<String, Vec<String>>. However in this
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// example the simpler approach is sufficient.
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let params = form_urlencoded::parse(b.as_ref()).into_owned().collect::<HashMap<String, String>>();
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let b = req.into_body().try_concat().await?;
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// Parse the request body. form_urlencoded::parse
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// always succeeds, but in general parsing may
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// fail (for example, an invalid post of json), so
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// returning early with BadRequest may be
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// necessary.
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//
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// Warning: this is a simplified use case. In
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// principle names can appear multiple times in a
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// form, and the values should be rolled up into a
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// HashMap<String, Vec<String>>. However in this
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// example the simpler approach is sufficient.
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let params = form_urlencoded::parse(b.as_ref()).into_owned().collect::<HashMap<String, String>>();
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// Validate the request parameters, returning
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// early if an invalid input is detected.
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let name = if let Some(n) = params.get("name") {
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n
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// Validate the request parameters, returning
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// early if an invalid input is detected.
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let name = if let Some(n) = params.get("name") {
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n
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} else {
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return Ok(Response::builder()
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.status(StatusCode::UNPROCESSABLE_ENTITY)
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.body(MISSING.into())
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.unwrap());
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};
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let number = if let Some(n) = params.get("number") {
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if let Ok(v) = n.parse::<f64>() {
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v
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} else {
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return Response::builder()
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return Ok(Response::builder()
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.status(StatusCode::UNPROCESSABLE_ENTITY)
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.body(MISSING.into())
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.unwrap();
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};
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let number = if let Some(n) = params.get("number") {
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if let Ok(v) = n.parse::<f64>() {
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v
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} else {
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return Response::builder()
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.status(StatusCode::UNPROCESSABLE_ENTITY)
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.body(NOTNUMERIC.into())
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.unwrap();
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}
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} else {
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return Response::builder()
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.status(StatusCode::UNPROCESSABLE_ENTITY)
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.body(MISSING.into())
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.unwrap();
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};
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.body(NOTNUMERIC.into())
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.unwrap());
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}
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} else {
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return Ok(Response::builder()
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.status(StatusCode::UNPROCESSABLE_ENTITY)
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.body(MISSING.into())
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.unwrap());
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};
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// Render the response. This will often involve
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// calls to a database or web service, which will
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// require creating a new stream for the response
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// body. Since those may fail, other error
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// responses such as InternalServiceError may be
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// needed here, too.
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let body = format!("Hello {}, your number is {}", name, number);
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Response::new(body.into())
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}))
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// Render the response. This will often involve
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// calls to a database or web service, which will
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// require creating a new stream for the response
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// body. Since those may fail, other error
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// responses such as InternalServiceError may be
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// needed here, too.
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let body = format!("Hello {}, your number is {}", name, number);
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Ok(Response::new(body.into()))
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},
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_ => {
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Box::new(future::ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(Body::empty())
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.unwrap()))
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Ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(Body::empty())
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.unwrap())
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}
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}
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}
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fn main() {
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#[hyper::rt::main]
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async fn main() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
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pretty_env_logger::init();
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let addr = ([127, 0, 0, 1], 1337).into();
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let server = Server::bind(&addr)
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.serve(|| service_fn(param_example))
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.map_err(|e| eprintln!("server error: {}", e));
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.serve(make_service_fn(|_| {
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async {
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Ok::<_, hyper::Error>(service_fn(param_example))
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}
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}));
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hyper::rt::run(server);
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println!("Listening on http://{}", addr);
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server.await?;
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Ok(())
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}
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