【Tokio】异步超时任务

环境

• Time 2022-01-11
• Rust 1.57.0
• Tokio 1.15.0

概念

参考：https://docs.rs/tokio/latest/tokio/time/index.html

示例

timeout

use std::io;

use tokio::time::{self, Duration};

#[tokio::main]
async fn main() -> io::Result<()> {
    if let Err(e) = time::timeout(Duration::from_secs(1), async {
        time::sleep(Duration::from_secs(4)).await;
    })
    .await
    {
        println!("error: {}", e);
    }

    Ok(())
}

timeout_at

use tokio::time::{self, Duration, Instant};

#[tokio::main]
async fn main() {
    let deadline = Instant::now() + Duration::from_secs(1);
    if let Err(e) = time::timeout_at(deadline, async {
        time::sleep(Duration::from_secs(4)).await;
    })
    .await
    {
        println!("error: {}", e);
    }
}

总结

通过 timeout 和 timeout_at 来定义异步的超时任务。

附录