56 lines
1.9 KiB
Rust
56 lines
1.9 KiB
Rust
#![deny(warnings)]
|
|
|
|
use std::sync::{Arc, atomic::{AtomicUsize, Ordering}};
|
|
|
|
use hyper::{Body, Error, Response, Server};
|
|
use hyper::service::{make_service_fn, service_fn};
|
|
|
|
#[tokio::main]
|
|
async fn main() {
|
|
pretty_env_logger::init();
|
|
|
|
let addr = ([127, 0, 0, 1], 3000).into();
|
|
|
|
// For the most basic of state, we just share a counter, that increments
|
|
// with each request, and we send its value back in the response.
|
|
let counter = Arc::new(AtomicUsize::new(0));
|
|
|
|
// The closure inside `make_service_fn` is run for each connection,
|
|
// creating a 'service' to handle requests for that specific connection.
|
|
let make_service = make_service_fn(move |_| {
|
|
// While the state was moved into the make_service closure,
|
|
// we need to clone it here because this closure is called
|
|
// once for every connection.
|
|
//
|
|
// Each connection could send multiple requests, so
|
|
// the `Service` needs a clone to handle later requests.
|
|
let counter = counter.clone();
|
|
|
|
async move {
|
|
// This is the `Service` that will handle the connection.
|
|
// `service_fn` is a helper to convert a function that
|
|
// returns a Response into a `Service`.
|
|
Ok::<_, Error>(service_fn(move |_req| {
|
|
// Get the current count, and also increment by 1, in a single
|
|
// atomic operation.
|
|
let count = counter.fetch_add(1, Ordering::AcqRel);
|
|
async move {
|
|
Ok::<_, Error>(
|
|
Response::new(Body::from(format!("Request #{}", count)))
|
|
)
|
|
}
|
|
}))
|
|
}
|
|
});
|
|
|
|
let server = Server::bind(&addr)
|
|
.serve(make_service);
|
|
|
|
println!("Listening on http://{}", addr);
|
|
|
|
if let Err(e) = server.await {
|
|
eprintln!("server error: {}", e);
|
|
}
|
|
}
|
|
|