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