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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,69 +1,61 @@ | ||
| #![deny(warnings)] | ||
| #![allow(clippy::unused_async)] | ||
|
|
||
| //! Graceful shutdown server. | ||
| //! | ||
| //! See <https://github.com/hyperium/hyper/blob/master/examples/graceful_shutdown.rs> | ||
| use std::{net::SocketAddr, sync::Arc, time::Duration}; | ||
| use tokio::{net::TcpListener, pin}; | ||
| use viz::{server::conn::http1, Io, Request, Responder, Result, Router, Tree}; | ||
| use std::net::SocketAddr; | ||
| use tokio::net::TcpListener; | ||
| use tokio::signal; | ||
| use tracing::{error, info}; | ||
| use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt}; | ||
| use viz::{serve, Request, Result, Router}; | ||
|
|
||
| async fn index(_: Request) -> Result<&'static str> { | ||
| Ok("Hello, World!") | ||
| } | ||
|
|
||
| #[tokio::main] | ||
| async fn main() -> Result<()> { | ||
| tracing_subscriber::registry() | ||
| .with( | ||
| tracing_subscriber::EnvFilter::try_from_default_env() | ||
| .unwrap_or_else(|_| "tracing=debug,hyper=debug".into()), | ||
| ) | ||
| .with(tracing_subscriber::fmt::layer()) | ||
| .init(); | ||
|
|
||
| let addr = SocketAddr::from(([127, 0, 0, 1], 3000)); | ||
| let listener = TcpListener::bind(addr).await?; | ||
| println!("listening on {addr}"); | ||
| info!("listening on {addr}"); | ||
|
|
||
| let app = Router::new().get("/", index); | ||
| let tree = Arc::new(Tree::from(app)); | ||
|
|
||
| // Use a 5 second timeout for incoming connections to the server. | ||
| // If a request is in progress when the 5 second timeout elapses, | ||
| // use a 2 second timeout for processing the final request and graceful shutdown. | ||
| let connection_timeouts = vec![Duration::from_secs(5), Duration::from_secs(2)]; | ||
|
|
||
| loop { | ||
| // Clone the connection_timeouts so they can be passed to the new task. | ||
| let connection_timeouts_clone = connection_timeouts.clone(); | ||
| let server = serve(listener, app).signal(shutdown_signal()); | ||
|
|
||
| let (stream, addr) = listener.accept().await?; | ||
| let tree = tree.clone(); | ||
| if let Err(e) = server.await { | ||
| error!("{e}"); | ||
| } | ||
|
|
||
| tokio::task::spawn(async move { | ||
| // Pin the connection object so we can use tokio::select! below. | ||
| let conn = http1::Builder::new() | ||
| .serve_connection(Io::new(stream), Responder::new(tree, Some(addr))); | ||
| pin!(conn); | ||
| Ok(()) | ||
| } | ||
|
|
||
| // Iterate the timeouts. Use tokio::select! to wait on the | ||
| // result of polling the connection itself, | ||
| // and also on tokio::time::sleep for the current timeout duration. | ||
| for (iter, sleep_duration) in connection_timeouts_clone.iter().enumerate() { | ||
| println!("iter = {iter} sleep_duration = {sleep_duration:?}"); | ||
| tokio::select! { | ||
| res = conn.as_mut() => { | ||
| // Polling the connection returned a result. | ||
| // In this case print either the successful or error result for the connection | ||
| // and break out of the loop. | ||
| match res { | ||
| Ok(()) => println!("after polling conn, no error"), | ||
| Err(e) => println!("error serving connection: {e:?}"), | ||
| }; | ||
| break; | ||
| } | ||
| () = tokio::time::sleep(*sleep_duration) => { | ||
| // tokio::time::sleep returned a result. | ||
| // Call graceful_shutdown on the connection and continue the loop. | ||
| println!("iter = {iter} got timeout_interval, calling conn.graceful_shutdown"); | ||
| conn.as_mut().graceful_shutdown(); | ||
| } | ||
| } | ||
| } | ||
| }); | ||
| async fn shutdown_signal() { | ||
| let ctrl_c = async { | ||
| signal::ctrl_c() | ||
| .await | ||
| .expect("failed to install Ctrl+C handler"); | ||
| }; | ||
|
|
||
| #[cfg(unix)] | ||
| let terminate = async { | ||
| signal::unix::signal(signal::unix::SignalKind::terminate()) | ||
| .expect("failed to install signal handler") | ||
| .recv() | ||
| .await; | ||
| }; | ||
|
|
||
| #[cfg(not(unix))] | ||
| let terminate = std::future::pending::<()>(); | ||
|
|
||
| tokio::select! { | ||
| _ = ctrl_c => {}, | ||
| _ = terminate => {}, | ||
| } | ||
| } |
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