initial commit

+ some reasearch on returning error when using async task
This commit is contained in:
Suyono 2023-11-20 22:20:34 +11:00
commit 6df632bc76
5 changed files with 443 additions and 0 deletions

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use std::fmt;
use std::error::Error;
use tokio::signal::unix::{signal, SignalKind};
use tokio::select;
use tokio::task::{self, JoinHandle};
#[derive(Debug,Clone)]
struct InvalidState;
impl fmt::Display for InvalidState {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "cannot recover the state")
}
}
impl Error for InvalidState {}
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
let sighandler: JoinHandle<Result<(), Box<dyn Error + Send + Sync>>> = task::spawn(async {
let mut sigint = signal(SignalKind::interrupt())?;
let mut sigterm = signal(SignalKind::terminate())?;
let mut sigchld = signal(SignalKind::child())?;
select! {
_ = sigint.recv() => {
println!("got SIGINT");
},
_ = sigterm.recv() => {
println!("got SIGTERM");
return Err(InvalidState.into());
},
_ = sigchld.recv() => {
// return Err(())
},
}
Ok(())
});
if let Err(v) = sighandler.await? {
return Err(v as Box<dyn Error>)
}
Ok(())
}