Expand description
backon intends to provide an opposite backoff implementation of the popular backoff.
- Newer: developed by Rust edition 2021 and latest stable.
- Cleaner: Iterator based abstraction, easy to use, customization friendly.
- Easier: Trait based implementations, works like a native function provided by closures.
Backoff
Any types that implements Iterator<Item = Duration> can be used as backoff.
backon also provides backoff implementations with reasonable defaults:
ConstantBackoff: backoff with constant delay and limited times.ExponentialBackoff: backoff with exponential delay, also provides jitter supports.
Examples
Retry with default settings.
use anyhow::Result;
use backon::ExponentialBackoff;
use backon::Retryable;
async fn fetch() -> Result<String> {
Ok(reqwest::get("https://www.rust-lang.org")
.await?
.text()
.await?)
}
#[tokio::main]
async fn main() -> Result<()> {
let content = fetch.retry(ExponentialBackoff::default()).await?;
println!("fetch succeeded: {}", content);
Ok(())
}Retry with specify retryable error.
use anyhow::Result;
use backon::ExponentialBackoff;
use backon::Retryable;
async fn fetch() -> Result<String> {
Ok(reqwest::get("https://www.rust-lang.org")
.await?
.text()
.await?)
}
#[tokio::main]
async fn main() -> Result<()> {
let content = fetch
.retry(ExponentialBackoff::default())
.when(|e| e.to_string() == "retryable")
.await?;
println!("fetch succeeded: {}", content);
Ok(())
}Structs
ConstantBackoff provides backoff with constant delay and limited times.
Exponential backoff implementation.