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retra-ratelimit

A powerful continuous rate limiting extension for retra

GitHub | NPM

Install

npm i retra-ratelimit

Usage

First, require the package.

const RateLimiter = require('retra-ratelimit')

// ... create your retra app ^
 
const rl = new RateLimiter({
    // options
}, [
    // rules
])
 
app.use(rl.extension)
 
// ... start server v

Rules

Rules are Objects. Properties of a rule:

• time required - How much time to look through logs for to find matching requests. This is an array, which looks like this: [5, 'seconds'] or [6, 'minutes']
• limit required - How many requests to allow within this period of time
• method - Request method
• pathname - Request pathname. Can be a Regular Expression or a String.
• blockMessage - Message to respond with when blocking (as error property of JSON response)

Options

Options:

• cloudflare - If enabled, uses the CF-Connecting-IP header to detect client IPs
• blockMessage - Message to respond with when blocking (used when no blockMessage is defined)
• varyLimit- If enabled, varies limit for rules per request by up to 2 requests, making it harder for attackers to detect ratelimiting rules

Cluster usage

In the master process, don't start a server but create a RateLimiter.

When forking a worker, add it to the RateLimiter.

const worker = cluster.fork()
 
rl.addWorker(worker)

Inside of the worker, instruct the RateLimiter to defer ratelimiting logic to the parent process.

rl.deferToParent()

Disqualifying a Request from Rate Limiting

By disqualifying requests from rate limiting, legitimate requests may be allowed in unlimited quantity. (ex. successful login attempts)

req.disqualifyRL()