@envelop/rate-limiter

This plugins uses graphql-rate-limit in order to limit the rate of calling queries and mutations.

Getting Started

yarn add @envelop/rate-limiter

Usage Example

import { execute, parse, specifiedRules, subscribe, validate } from 'graphql'
import { envelop, useEngine } from '@envelop/core'
import { IdentifyFn, useRateLimiter } from '@envelop/rate-limiter'

const identifyFn: IdentifyFn = context => {
  return context.request.ip
}

const getEnveloped = envelop({
  plugins: [
    useEngine({ parse, validate, specifiedRules, execute, subscribe }),
    // ... other plugins ...
    useRateLimiter({
      identifyFn
    })
  ]
})

By default, we assume that you have the GraphQL directive definition as part of your GraphQL schema (directive @rateLimit(max: Int, window: String, message: String) on FIELD_DEFINITION).

Then, in your GraphQL schema SDL, you can add @rateLimit directive to your fields, and the limiter will get called only while resolving that specific field:

type Query {
  posts: [Post]! @rateLimit(
    window: "5s", // time interval window for request limit quota
    max: 10,  // maximum requests allowed in time window
    message: "Too many calls!"  // quota reached error message
  )
  # unlimitedField: String
}

You can apply that directive to any GraphQL field definition, not only to root fields.

Error message interpolation

The message argument of the @rateLimit directive can be dynamic. You {{var}} or {{ var }} syntax to interpolate variables.

type Query {
  posts: [Post]! @rateLimit(window: "5s", max: 10, message: "Too many calls made by {{ id }}")
}

The only available variable so far is id.

Notes

You can find more details here: https://github.com/teamplanes/graphql-rate-limit#readme