Node.js + redis based rate lim

#RedisLimiter A simple and efficient Node.js + redis based rate limiter.

var redis = require('redis'); var client = redis.createClient(); var RedisLimiter = require('redis-limiter'); var limiter = new RedisLimiter({ client: client, prefix: 'lim' }); // 5 requests per second limiter.add('/api/actionOne', { limit: 5, interval: 1 }); // 7 requests every 10 seconds limiter.add('/api/actionTwo', { limit: 7, interval: 10 }); app.get('/api/*', function(req, res, next) { limiter.limit(req.path, req.ip, function(err, result) { if (err || !result) { return next(); } if (result.exceeded) { return res.sendStatus(429); } next(); }); }); API Constructor(opt): RedisLimiter

opt.client The redis client object.
opt.prefix The key prefix for entries into your redis store (default: 'lim').
opt.limits Initialise all limits with a single object that maps name -> opt. This is an alternative to calling the add method for each limit.

Add a single limit object with name name, having interval and limit properties defined within opt.

Remove a limit object.

Test if a limit object exists.

Increment a particular user's usage count for a limit object on the current interval. If the current interval does not exist or has expired, a new one is created.

The callback function receives an error object and a result object as arguments. The result object will contain the fields: exceeded:Boolean and count:Number indicating whether or not the action's limit was exceeded and the count for the current interval respectively.