@hackage / ratelimiter

In-memory rate limiter

Latest0.1.0

About

Metadata

  • Last updated , by AlexanderThiemann
  • License BSD-3-Clause
  • Categories Web Development

  • Maintained by: Alexander Thiemann <mail@thiemann.at>

  • Lottery factor: 0

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Installation

Readme

Haskell: ratelimiter

A simple in-memory rate-limiter library.

Usage

import Control.RateLimiter
import qualified Data.Vector as V

main :: IO
main =
  -- one rate limiter can have multiple rules
  do limiter <- 
        newRateLimiter $ V.fromList
        [ RateLimitConfig (RollingWindow 60) 200 -- 200 per minute
        , RateLimitConfig (RollingWindow 3600) 400 -- 400 per hour
        ]
     let myRateLimitedFunction =
           do isLimited <- isRateLimited () limiter
              if isLimitd then pure Nothing else Just <$> someExpensiveWork
     -- ... use myRateLimitedFunction