expire_cache 0.1.20

High-performance generational cache for Rust / 高性能分代缓存
Documentation 
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#[macro_export]
macro_rules! get_or_init_async {
  ($cache:expr, $key:expr, $init:expr) => {{
    let key = $key;
    match $cache.get(key) {
      Some(v) => Ok(v),
      None => {
        let val = $init().await?;
        $cache.insert(key.to_owned(), val);
        Ok($cache.get(key).unwrap())
      }
    }
  }};
}