rate_limit

Values

make_layer

pub fn make_layer(
  requests: Int,
  over_seconds: Int,
  housekeep_every: Int,
) -> fn(
  minc.Incoming(state),
  fn(minc.Incoming(state)) -> Result(
    response.Response(mist.ResponseData),
    fail.Failure,
  ),
) -> Result(response.Response(mist.ResponseData), fail.Failure)

This makes an IP-based rate-limiting Layer that will allow requests requests from any given IP in the space of over_seconds seconds. Any more requests than that in a given time period will be automatically rejected with a 429 and not passed to the inner Handler.

The housekeep_every argument controls how often the map of timers is crawled through to prune expired ones. Larger values will result in less frequent pauses, but possibly more memory usage.