An async MPSC request-response channel for Tokio, where you can send a response to the sender. Inspired by crossbeam_requests.
#[tokio::main]
async fn main() {
let buffer_size = 100;
let (tx, mut rx) = bmrng::channel::<i32, i32>(buffer_size);
tokio::spawn(async move {
while let Ok((input, mut responder)) = rx.recv().await {
if let Err(err) = responder.respond(input * input) {
println!("sender dropped the response channel");
}
}
});
for i in 1..=10 {
if let Ok(response) = tx.send_receive(i).await {
println!("Requested {}, got {}", i, response);
assert_eq!(response, i * i);
}
}
}It is also possible to create a channel with a request timeout:
use tokio::time::{Duration, sleep};
#[tokio::main]
async fn main() {
let (tx, mut rx) = bmrng::channel_with_timeout::<i32, i32>(100, Duration::from_millis(100));
tokio::spawn(async move {
match rx.recv().await {
Ok((input, mut responder)) => {
sleep(Duration::from_millis(200)).await;
let res = responder.respond(input * input);
assert_eq!(res.is_ok(), true);
}
Err(err) => {
println!("all request senders dropped");
}
}
});
let response = tx.send_receive(8).await;
assert_eq!(response, Err(bmrng::error::RequestError::<i32>::RecvTimeoutError));
}There is also an unbounded alternative, bmrng::unbounded_channel() with sync .send() calls.