#cache #async #concurrent

shared-expiry-get

Simple concurrent async get with expiration for Rust

3 releases (breaking)

0.2.0 Jan 26, 2021
0.1.0 Jan 8, 2020
0.0.1 May 5, 2019

#41 in Caching

37 downloads per month

MIT license

21KB
466 lines

Simple concurrent async get with expiration for Rust.

Latest Version Docs

shared-expiry-get is a wrapper for accessing and caching a remote data source with some expiration criteria.

Features

  • retrieve only once even if multiple threads are trying to access the remote data at the same time
  • async support
  • update data on expiration

shared-expiry-get does not:

  • retry on error

Example Use Cases

  • cached access of an http source respecting cache control
  • cached access of a file which may get updated

A basic Example

#[derive(Clone)]
struct MyProvider {}
#[derive(Clone)]
struct Payload {}

impl Expiry for Payload {
    fn valid(&self) -> bool {
        true
    }
}

impl Provider<Payload> for MyProvider {
    fn update(&self) -> ExpiryFut<Payload> {
        future::ok::<Payload, ExpiryGetError>(Payload {}).into_future().boxed()
    }
}

async fn main() {
    let rs = RemoteStore::new(MyProvider {});
    let payload = rs.get().await;
    assert!(payload.is_ok());
}

Dependencies

~1.1–1.7MB
~37K SLoC