Kiryl Ye twlvl

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.

Directories on host machine:

/data/certbot/letsencrypt
/data/certbot/www
Nginx server in docker container

docker run -d --name nginx \

	import React, { ConsumerProps, createContext, useCallback, useMemo, useState } from "react";

	interface AnyContext {
	isAnyCharacteristic: boolean,
	anyApi: () => void,
	}

	export const AnyContext = createContext<AnyContext>({
	isAnyCharacteristic: false,
	anyApi: () => {throw new Error('Method is not implemented!')}

	/**
	* @description
	* Rudimentary mock of lodash.debounce, which assumes the default debounce options
	* - Jasmine 2.0.0
	* - lodash 2.4.1, underscore 1.7.0
	* - AngularJS 1.3.0
	*/
	function getDebounceMock ($timeout) {
	return function mockDebounceForAngularJS(fn, ms) {
	var callPromise;

	// Intercepting HTTP calls with AngularJS.
	angular.module('MyApp', [])
	.config(function ($provide, $httpProvider) {

	// Intercept http calls.
	$provide.factory('MyHttpInterceptor', function ($q) {
	return {
	// On request success
	request: function (config) {
	// console.log(config); // Contains the data about the request before it is sent.

	rem Run it with admin permissions
	@echo off
	SET st3Path=C:\Program Files\Sublime Text 3\sublime_text.exe

	rem add it for all file types
	@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3" /t REG_SZ /v "" /d "Open with Sublime Text 3" /f
	@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3" /t REG_EXPAND_SZ /v "Icon" /d "%st3Path%,0" /f
	@reg add "HKEY_CLASSES_ROOT\*\shell\Open with Sublime Text 3\command" /t REG_SZ /v "" /d "%st3Path% \"%%1\"" /f

	rem add it for folders