Chris Witko chriswitko

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

	import React from "react";
	import { StyleSheet, Text, View, Image } from "react-native";

	export default class App extends React.Component {
	render() {
	return (
	<View style={styles.container}>
	<View style={styles.detailsContainer}>
	<Text style={styles.title}>Conference Keynote</Text>
	<Text style={styles.subtitle}>Thursday, May 18</Text>

	from boto3.dynamodb.conditions import Key

	class logCenter(object):

	def __init__(self, **kwargs):
	self.__dict__.update(kwargs)

	# Update new followers to database (have already recieved direct messages)
	def dynamoPut(self, follower, table):
	table.put_item(

	'use strict';

	// Dependencies
	const gcloud = require('google-cloud', {
	projectId: 'sara-bigquery',
	keyfileName: 'keyfile.json'
	});
	const vision = gcloud.vision();
	const fs = require('fs');
	const async = require('async');

	/**
	This router depends on the history package:

	yarn add history

	Simple router for switching between routes. Based on
	[hashrouter.js](https://gist.github.com/danieldunderfelt/4d016333a947764c1a5687d26d48ca27)

	Suitable for MobX/Redux architecture and especially
	handy for tabs, which is the reason why it exists.

	var Web3 = require('web3');
	var util = require('ethereumjs-util');
	var tx = require('ethereumjs-tx');
	var lightwallet = require('eth-lightwallet');
	var txutils = lightwallet.txutils;
	var web3 = new Web3(
	new Web3.providers.HttpProvider('https://rinkeby.infura.io/')
	);
	var address = '0x8D68583e625CAaE969fA9249502E105a21435EbF';
	var key = '1ce642301e680f60227b9d8ffecad474f15155b6d8f8a2cb6bde8e85c8a4809a';

	FROM ruby:2.3.3
	RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
	RUN mkdir /app
	WORKDIR /app
	ADD Gemfile /app/Gemfile
	ADD Gemfile.lock /app/Gemfile.lock
	RUN bundle install
	ADD . /app
	EXPOSE 3000
	CMD rails s -p 3000

	package bayes

	// Classifier implements the Naive Bayes Classifier.
	type Classifier struct {
	classPerWordCount map[string]int
	classPerDocument map[string]int
	wordClassCount map[string]map[string]int
	documentsCount int
	}

	package main

	import (
	"errors"
	"fmt"
	"io/ioutil"
	"os"
	"regexp"
	"strings"
	"sync"