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use std::{
convert::Infallible,
future::Future,
sync::{
atomic::{AtomicUsize, Ordering},
Arc,
},
};
use hyper::server::conn::Http;
use tokio::{
io::{AsyncRead, AsyncWrite, Result as IoResult},
sync::Notify,
time::Duration,
};
use crate::{
listener::{Acceptor, Listener},
web::{LocalAddr, RemoteAddr},
Endpoint, EndpointExt, IntoEndpoint, Response,
};
pub struct Server<T> {
acceptor: T,
}
impl<T: Acceptor> Server<T> {
pub async fn new<K: Listener<Acceptor = T>>(listener: K) -> IoResult<Server<T>> {
Ok(Self {
acceptor: listener.into_acceptor().await?,
})
}
pub fn new_with_acceptor(acceptor: T) -> Self {
Self { acceptor }
}
pub fn local_addr(&self) -> Vec<LocalAddr> {
self.acceptor.local_addr()
}
pub async fn run<E>(self, ep: E) -> IoResult<()>
where
E: IntoEndpoint,
E::Endpoint: 'static,
{
self.run_with_graceful_shutdown(ep, futures_util::future::pending(), None)
.await
}
pub async fn run_with_graceful_shutdown<E>(
self,
ep: E,
signal: impl Future<Output = ()>,
timeout: Option<Duration>,
) -> IoResult<()>
where
E: IntoEndpoint,
E::Endpoint: 'static,
{
let ep = ep.into_endpoint();
let ep = Arc::new(ep.map_to_response());
let Server { mut acceptor } = self;
let alive_connections = Arc::new(AtomicUsize::new(0));
let notify = Arc::new(Notify::new());
let timeout_notify = Arc::new(Notify::new());
tokio::pin!(signal);
for addr in acceptor.local_addr() {
tracing::info!(addr = %addr, "listening");
}
tracing::info!("server started");
loop {
tokio::select! {
_ = &mut signal => {
if let Some(timeout) = timeout {
tracing::info!(
timeout_in_seconds = timeout.as_secs_f32(),
"initiate graceful shutdown",
);
let timeout_notify = timeout_notify.clone();
tokio::spawn(async move {
tokio::time::sleep(timeout).await;
timeout_notify.notify_waiters();
});
} else {
tracing::info!("initiate graceful shutdown");
}
break;
},
res = acceptor.accept() => {
if let Ok((socket, local_addr, remote_addr)) = res {
let ep = ep.clone();
let alive_connections = alive_connections.clone();
let notify = notify.clone();
let timeout_notify = timeout_notify.clone();
tokio::spawn(async move {
alive_connections.fetch_add(1, Ordering::SeqCst);
if timeout.is_some() {
tokio::select! {
_ = serve_connection(socket, local_addr, remote_addr, ep) => {}
_ = timeout_notify.notified() => {}
}
} else {
serve_connection(socket, local_addr, remote_addr, ep).await;
}
if alive_connections.fetch_sub(1, Ordering::SeqCst) == 1 {
notify.notify_one();
}
});
}
}
}
}
drop(acceptor);
if alive_connections.load(Ordering::SeqCst) > 0 {
tracing::info!("wait for all connections to close.");
notify.notified().await;
}
tracing::info!("server stopped");
Ok(())
}
}
async fn serve_connection(
socket: impl AsyncRead + AsyncWrite + Send + Unpin + 'static,
local_addr: LocalAddr,
remote_addr: RemoteAddr,
ep: Arc<dyn Endpoint<Output = Response>>,
) {
let service = hyper::service::service_fn({
move |req: hyper::Request<hyper::Body>| {
let ep = ep.clone();
let local_addr = local_addr.clone();
let remote_addr = remote_addr.clone();
async move {
let resp = ep.call((req, local_addr, remote_addr).into()).await.into();
Ok::<_, Infallible>(resp)
}
}
});
let conn = Http::new()
.serve_connection(socket, service)
.with_upgrades();
let _ = conn.await;
}