Function retry 

pub async fn retry<F, Fut, T>(policy: RetryPolicy, f: F) -> Result<T>
where
    F: FnMut() -> Fut,
    Fut: Future<Output = Result<T>>,

Execute f up to policy.max_attempts times, retrying only when the returned error is Error::is_retryable.

Non-retryable errors (e.g. authentication, validation, syntax) are returned immediately without further attempts. Between attempts the future sleeps for an exponentially increasing backoff capped at RetryPolicy::max_backoff.

Example

use geode_client::{retry, RetryPolicy, Error};

let result = retry(RetryPolicy::default(), || async {
    // ... perform a fallible operation ...
    Ok::<i32, Error>(42)
})
.await?;
assert_eq!(result, 42);