Mutinda Boniface bmutinda

Moved to Shopify/graphql-design-tutorial

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.

	buildscript {
	repositories {
	mavenCentral()
	maven {
	url 'https://oss.sonatype.org/content/repositories/snapshots/'
	}
	}
	dependencies {
	classpath 'com.android.tools.build:gradle:0.9.+'
	classpath 'com.squareup.gradle:gradle-android-test-plugin:0.9.1-SNAPSHOT'

	public abstract class EndlessRecyclerViewScrollListener extends RecyclerView.OnScrollListener {
	// The minimum amount of items to have below your current scroll position
	// before loading more.
	private int visibleThreshold = 5;
	// The current offset index of data you have loaded
	private int currentPage = 0;
	// The total number of items in the dataset after the last load
	private int previousTotalItemCount = 0;
	// True if we are still waiting for the last set of data to load.
	private boolean loading = true;

	_.mixin({ pickSchema: function (model, excluded) {
	var fields = [];
	model.schema.eachPath(function (path) {
	_.isArray(excluded) ? excluded.indexOf(path) < 0 ? fields.push(path) : false : path === excluded ? false : fields.push(path);
	});
	return fields;
	}
	});

	// Example

	public class InstallListener extends BroadcastReceiver {
	@Override
	public void onReceive(Context context, Intent intent) {
	// called in the install referrer broadcast case
	}
	}

	package bmutinda.com.androidutils.libs;

	import android.view.MotionEvent;
	import android.view.View;

	/**
	* Created by Mutinda Boniface on 7/5/2015.
	*/
	public class SwipeEvents implements View.OnTouchListener {
	private SwipeCallback swipeCallback;

	/*
	* Copyright 2015 Johannes Homeier
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software

	<!DOCTYPE html>
	<html>
	<head>
	<title>Hello World!</title>
	</head>
	<body>
	<h1>Hello World!</h1>
	We are using node.js <script>document.write(process.version)</script>
	and atom-shell <script>document.write(process.versions['atom-shell'])</script>.
	</body>

	require 'rubygems'
	require 'keen'
	require 'json'
	require 'date'
	require 'active_support/all' #for datetime calculation e.g. weeks.ago.at_beginning_of_week
	require 'simple_xlsx' #for outputting excel files
	require 'cgi' #for URL encoding


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