107 lines
4.3 KiB
Rust
107 lines
4.3 KiB
Rust
#![deny(warnings)]
|
|
extern crate futures;
|
|
extern crate hyper;
|
|
extern crate pretty_env_logger;
|
|
extern crate tokio;
|
|
extern crate url;
|
|
|
|
use futures::{Future, Stream};
|
|
use futures::future::lazy;
|
|
|
|
use hyper::{Body, Method, Request, Response, StatusCode};
|
|
use hyper::server::{Http, Service};
|
|
|
|
use std::collections::HashMap;
|
|
use url::form_urlencoded;
|
|
|
|
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>";
|
|
static MISSING: &[u8] = b"Missing field";
|
|
static NOTNUMERIC: &[u8] = b"Number field is not numeric";
|
|
|
|
struct ParamExample;
|
|
|
|
impl Service for ParamExample {
|
|
type Request = Request<Body>;
|
|
type Response = Response<Body>;
|
|
type Error = hyper::Error;
|
|
type Future = Box<Future<Item = Self::Response, Error = Self::Error> + Send>;
|
|
|
|
fn call(&self, req: Request<Body>) -> 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<String, Vec<String>>. However in this
|
|
// example the simpler approach is sufficient.
|
|
let params = form_urlencoded::parse(b.as_ref()).into_owned().collect::<HashMap<String, String>>();
|
|
|
|
// 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::<f64>() {
|
|
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".parse().unwrap();
|
|
|
|
tokio::run(lazy(move || {
|
|
let server = Http::new().bind(&addr, || Ok(ParamExample)).unwrap();
|
|
println!("Listening on http://{} with 1 thread.", server.local_addr().unwrap());
|
|
server.run().map_err(|err| eprintln!("Server error {}", err))
|
|
}));
|
|
}
|