Function retry 

pub async fn retry<F, Fut, T, E, D>(
    f: F,
    config: Config<D>,
) -> Result<T, Error<E>>
where
    F: FnMut() -> Fut,
    Fut: Future<Output = Result<T, E>>,
    D: Delay,

Retries a fallible async operation with the given configuration.

The operation f is called repeatedly. On success the value is returned. On failure the config’s delay strategy determines how long to wait before retrying. Once the configured number of attempts is exhausted, the last error is returned wrapped in Error.

If attempts is 0 (the default), the operation is retried forever until it succeeds.

Example

use std::time::Duration;
use retry::{retry, Config};
use retry::delay::Fixed;

let result = retry(
    || async { Ok::<_, &'static str>("hello") },
    Config::new(Fixed::new(Duration::from_millis(10))).with_attempts(3),
)
.await?;
assert_eq!(result, "hello");