fure

A crate for retrying futures.

[Policy] trait will help you define different retry policies.

Some builtin policies can be found in [policies] module.

By default this create uses tokio timers for [crate::policies::interval] and [crate::policies::backoff] policies, but async-std is also available as feature async-std.

Examples.

Interval retry.

Starts with sending a request, setting up a 1 second timer, and waits for either of them.

If the timer completes first (it means that the request didn't complete in 1 second) one more request fires.

If the request completes first and it has an [Ok] response it is returned, if request has an [Err] response, timer resets and a new request fires.

At most 4 requests will be fired.

When one of runninng requests completes with an [Ok] result it will be returned. ```rust use fure::policies::{interval, failed}; use std::time::Duration;

let getbody = || async { reqwest::get("https://www.rust-lang.org") .await? .text() .await }; let policy = failed(interval(Duration::fromsecs(1)), 3); let body = fure::retry(get_body, policy).await?; println!("body = {}", body); ```

Sequential retry with backoff.

Retries failed requests with an exponential backoff and a jitter. ```rust use fure::{policies::{backoff, cond}, backoff::{exponential, jitter}}; use std::time::Duration;

let getbody = || async { reqwest::get("https://www.rust-lang.org") .await? .text() .await }; let expbackoff = exponential(Duration::fromsecs(1), 2, Some(Duration::fromsecs(10))) .map(jitter); let policy = cond(backoff(expbackoff), |result| !matches!(result, Some(Ok()))); let body = fure::retry(get_body, policy).await?; println!("body = {}", body); ```

License: MIT