A rolling rate limit using Redis. Original idea from Peter Hayes. Uses a lua script for atomic operations and to prevent blocked actions from substracting from the bucket.

var RollingLimit = require('redis-rolling-limit');

Creates a new RollingLimit instance.

Options:

• limit: (required) maximum of allowed uses in interval
• interval: (required) millisecond duration for the limit
• redis: (required) an instance of RedisClient
• prefix: (optional) a string to prepend before id for each key

Takes a token from the limit's bucket for id in redis and calls callback with (error, numLeft). numLeft is the number of tokens left in the bucket. amount is the number of tokens to take from the bucket and defaults to 1. If you wanted to get the count of tokens left, send in an amount of 0.

Returns a promise that can be used instead of the callback.

Re-fills the bucket for id in redis to max capacity. callback is called with (error). Returns a promise that can be used instead of the callback.