lemmy/crates/utils/src/request.rs

use std::future::Future;

#[tracing::instrument(skip_all)]
pub async fn retry<F, Fut, T>(f: F) -> Result<T, reqwest_middleware::Error>
where
  F: Fn() -> Fut,
  Fut: Future<Output = Result<T, reqwest_middleware::Error>>,
{
  retry_custom(|| async { Ok((f)().await) }).await
}

#[tracing::instrument(skip_all)]
async fn retry_custom<F, Fut, T>(f: F) -> Result<T, reqwest_middleware::Error>
where
  F: Fn() -> Fut,
  Fut: Future<Output = Result<Result<T, reqwest_middleware::Error>, reqwest_middleware::Error>>,
{
  let mut response: Option<Result<T, reqwest_middleware::Error>> = None;

  for _ in 0u8..3 {
    match (f)().await? {
      Ok(t) => return Ok(t),
      Err(reqwest_middleware::Error::Reqwest(e)) => {
        if e.is_timeout() {
          response = Some(Err(reqwest_middleware::Error::Reqwest(e)));
          continue;
        }
        return Err(reqwest_middleware::Error::Reqwest(e));
      }
      Err(otherwise) => {
        return Err(otherwise);
      }
    }
  }

  response.expect("retry http request")
}