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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
use std::future::Future;
use std::time::Duration;
pub fn retry<
F: FnMut() -> Fut,
T,
E,
Fut: Future<Output = Result<T, E>>,
ShouldRetry: FnMut(&E) -> bool,
>(
mut f: F,
mut should_retry: ShouldRetry,
) -> impl Future<Output = Result<T, E>> {
const WAITS: [Duration; 3] = [
Duration::from_millis(100),
Duration::from_millis(250),
Duration::from_millis(500),
];
let mut waits = WAITS.into_iter();
async move {
let mut first_result = None;
loop {
let result = f().await;
match result {
Ok(r) => return Ok(r),
Err(e) if !should_retry(&e) => return Err(e),
_ => {}
}
if first_result.is_none() {
first_result = Some(result);
}
let Some(wait) = waits.next() else {
return first_result.unwrap();
};
tokio::time::sleep(wait).await;
}
}
}
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