How to handle async runtime shutdown gracefully in a Rust Actix application?
Quick question that's been bugging me - I'm building a feature where I'm building an API using Actix-web (version 4.0) and I'm struggling with shutting down my async runtime cleanly upon receiving a termination signal... Currently, my application has a basic server setup, but when I try to stop the server, it doesn't seem to wait for ongoing requests to complete, which leads to dropped requests and unfinished tasks. I've implemented the server using the following code: ```rust use actix_web::{web, App, HttpServer}; use std::sync::Arc; use tokio::sync::RwLock; #[actix_web::main] async fn main() -> std::io::Result<()> { let data = Arc::new(RwLock::new(0)); let server = HttpServer::new(move || { App::new() .app_data(web::Data::new(data.clone())) .route("/", web::get().to(handle_request)) }) .bind("127.0.0.1:8080")? .run(); // Graceful shutdown logic here server.await } async fn handle_request() -> &'static str { // Simulate long running task tokio::time::sleep(std::time::Duration::from_secs(5)).await; "Hello, World!" } ``` When I send a SIGTERM signal to the server, the response time increases dramatically, and if I send multiple requests before shutting down, I can see that some requests end up being dropped. I've read about using `Signal` from the `tokio` crate to listen for shutdown signals, but I'm not sure how to integrate that into my Actix setup to ensure all in-progress requests complete before the server stops. Here’s what I’ve tried: - Adding a listener for signals using `tokio::signal::unix::Signal` but I couldn't figure out how to properly halt the server. - Using `HttpServer::stop(true)` method defaults to not waiting for ongoing requests to complete, which is exactly the opposite of what I want. Does anyone have guidelines or examples on how I can implement this graceful shutdown effectively in Actix-web without dropping requests? I would appreciate any insights or working examples that address this scenario. I'm using Rust 3.9 in this project. Any advice would be much appreciated. I appreciate any insights! I'm working in a CentOS environment. Thanks, I really appreciate it! Thanks for any help you can provide!