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## 0-rate-limiters.md

      
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                ptarjan
                / 0-rate-limiters.md
            
            
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              March 29, 2017 20:44
            
          
    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.

  
## drone-client.js
var arDrone = require('ar-drone')
  , client = arDrone.createClient()
  , stdin = process.openStdin()
  , isAirborne
  , speedFactor = 5
  , speeds = {
    x: 0,
    y: 0,
    z: 0
  }

## oauth2-restify.js
"use strict";

var restify = require("restify");

var users = require("./users");
// The users module will have a getAuthorizationFromAccessTokenAsync promise-returning export. (Convert to callbacks if you wish).
// It rejects in cause of not authorized, or fulfills with a { scope, customerId } object if the user is authorized.
// The scope property indicates which scopes the user corresponding to a given access token has.

module.exports = function authPlugin(serverRequest, serverResponse, next) {

## camera.html
<!DOCTYPE html>
<html>
  <head>
    <title>Capture Photo</title>
    <meta name="viewport" content="width=device-width,height=device-height,initial-scale=1"/>
    <script type="text/javascript" charset="utf-8" src="js/phonegap.js"></script>
    <script type="text/javascript" charset="utf-8">

    var pictureSource;   // picture source
    var destinationType; // sets the format of returned value

## backbone_pushstate_router.js
// All navigation that is relative should be passed through the navigate
// method, to be processed by the router. If the link has a `data-bypass`
// attribute, bypass the delegation completely.
$(document).on("click", "a[href]:not([data-bypass])", function(evt) {
  // Get the absolute anchor href.
  var href = { prop: $(this).prop("href"), attr: $(this).attr("href") };
  // Get the absolute root.
  var root = location.protocol + "//" + location.host + Application.root;

  // Ensure the root is part of the anchor href, meaning it's relative.

## paginated_collection.js
// includes bindings for fetching/fetched

var PaginatedCollection = Backbone.Collection.extend({
  initialize: function() {
    _.bindAll(this, 'parse', 'url', 'pageInfo', 'nextPage', 'previousPage', 'filtrate', 'sort_by');
    typeof(options) != 'undefined' || (options = {});
    typeof(this.limit) != 'undefined' || (this.limit = 20);
    typeof(this.offset) != 'undefined' || (this.offset = 0);
    typeof(this.filter_options) != 'undefined' || (this.filter_options = {});
    typeof(this.sort_field) != 'undefined' || (this.sort_field = '');

## fix_macintosh_portrange.sh
#sudo sysctl -w net.inet.ip.portrange.first=32768
sudo sysctl -w net.inet.ip.portrange.first=12000
sudo sysctl -w net.inet.tcp.msl=1000
sudo sysctl -w kern.maxfiles=1000000 kern.maxfilesperproc=1000000
	var arDrone = require('ar-drone')
	, client = arDrone.createClient()
	, stdin = process.openStdin()
	, isAirborne
	, speedFactor = 5
	, speeds = {
	x: 0,
	y: 0,
	z: 0
	}
	"use strict";

	var restify = require("restify");

	var users = require("./users");
	// The users module will have a getAuthorizationFromAccessTokenAsync promise-returning export. (Convert to callbacks if you wish).
	// It rejects in cause of not authorized, or fulfills with a { scope, customerId } object if the user is authorized.
	// The scope property indicates which scopes the user corresponding to a given access token has.

	module.exports = function authPlugin(serverRequest, serverResponse, next) {
	<!DOCTYPE html>
	<html>
	<head>
	<title>Capture Photo</title>
	<meta name="viewport" content="width=device-width,height=device-height,initial-scale=1"/>
	<script type="text/javascript" charset="utf-8" src="js/phonegap.js"></script>
	<script type="text/javascript" charset="utf-8">

	var pictureSource; // picture source
	var destinationType; // sets the format of returned value
	// All navigation that is relative should be passed through the navigate
	// method, to be processed by the router. If the link has a `data-bypass`
	// attribute, bypass the delegation completely.
	$(document).on("click", "a[href]:not([data-bypass])", function(evt) {
	// Get the absolute anchor href.
	var href = { prop: $(this).prop("href"), attr: $(this).attr("href") };
	// Get the absolute root.
	var root = location.protocol + "//" + location.host + Application.root;

	// Ensure the root is part of the anchor href, meaning it's relative.
	// includes bindings for fetching/fetched

	var PaginatedCollection = Backbone.Collection.extend({
	initialize: function() {
	_.bindAll(this, 'parse', 'url', 'pageInfo', 'nextPage', 'previousPage', 'filtrate', 'sort_by');
	typeof(options) != 'undefined' \|\| (options = {});
	typeof(this.limit) != 'undefined' \|\| (this.limit = 20);
	typeof(this.offset) != 'undefined' \|\| (this.offset = 0);
	typeof(this.filter_options) != 'undefined' \|\| (this.filter_options = {});
	typeof(this.sort_field) != 'undefined' \|\| (this.sort_field = '');
	#sudo sysctl -w net.inet.ip.portrange.first=32768
	sudo sysctl -w net.inet.ip.portrange.first=12000
	sudo sysctl -w net.inet.tcp.msl=1000
	sudo sysctl -w kern.maxfiles=1000000 kern.maxfilesperproc=1000000