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Daniel Caixinha - Mastering Elixir

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Leverage the power of Elixir programming language to solve practical problems associated with scalability, concurrency, fault tolerance, and high availability.

Key Features
  • Enhance your Elixir programming skills using its powerful tools and abstractions
  • Discover how to develop a full-fledged file server
  • Understand how to use Phoenix to create a web interface for your application.
Book Description

Running concurrent, fault-tolerant applications that scale is a very demanding responsibility. After learning the abstractions that Elixir gives us, developers are able to build such applications with inconceivable low effort. There is a big gap between playing around with Elixir and running it in production, serving live requests. This book will help you fll this gap by going into detail on several aspects of how Elixir works and showing concrete examples of how to apply the concepts learned to a fully fledged application. In this book, you will learn how to build a rock-solid application, beginning by using Mix to create a new project. Then you will learn how the use of Erlangs OTP, along with the Elixir abstractions that run on top of it (such as GenServer and GenStage), that allow you to build applications that are easy to parallelize and distribute. You will also master supervisors (and supervision trees), and comprehend how they are the basis for building fault-tolerant applications. Then you will use Phoenix to create a web interface for your application. Upon fnishing implementation, you will learn how to take your application to the cloud, using Kubernetes to automatically deploy, scale, and manage it. Last, but not least, you will keep your peace of mind by learning how to thoroughly test and then monitor your application.

What you will learn
  • Use Elixir tools, including IEx and Mix
  • Find out how an Elixir project is structured and how to create umbrella applications
  • Discover the power of supervision trees, the basis for fault-tolerance
  • Create a Domain-Specifc Language (DSL) that abstracts complexity
  • Create a blazing-fast web interface for your application with Phoenix
  • Set up an automatic deployment process for the cloud
  • Monitor your application and be warned if anything unexpected happens
Who this book is for

Mastering Elixir is for you if you have experience in Elixir programming and want to take it to the next level. This Elixir book shows you how to build, deploy, and maintain robust applications, allowing you to go from tinkering with Elixir on side projects to using it in a live environment. However, no prior knowledge of Elixir is required to enjoy the complex topics covered in the book.

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Mastering Elixir Build and scale concurrent distributed and fault-tolerant - photo 1
Mastering Elixir
Build and scale concurrent, distributed, and fault-tolerant applications
Andr Albuquerque
Daniel Caixinha

BIRMINGHAM - MUMBAI Mastering Elixir Copyright 2018 Packt Publishing All - photo 2

BIRMINGHAM - MUMBAI
Mastering Elixir

Copyright 2018 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing or its dealers and distributors, will be held liable for any damages caused or alleged to have been caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

Commissioning Editor: Richa Tripathi
Acquisition Editor: Sandeep Mishra
Content Development Editor: Anugraha Arunagiri
Technical Editor: Jash Bavishi
Copy Editor: Muktikant Garimella
Project Coordinator: Ulhas Kambali
Proofreader: Safis Editing
Indexer: Pratik Shirodkar
Graphics: Tania Dutta
Production Coordinator: Shantanu Zagade

First published: July 2018

Production reference: 1280718

Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham
B3 2PB, UK.

ISBN 978-1-78847-267-8

www.packtpub.com

To Ana and Jos

Andr Albuquerque

To Raquel and Gabriel

Daniel Caixinha
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Contributors
About the authors

Andr Albuquerque is a software engineer at Onfido, after working in the banking industry for seven years. He has a master's degree from Instituto Superior Tcnico in distributed systems and software engineering, and, during his banking detour, he obtained a master's degree in economics. He is currently developing Onfido's microservices using Elixir and Ruby, learning every day about how applications can score and scale if we apply the correct tools and sound coding practices from the get-go. In his time off, he loves to build his own keyboards, play basketball, and spend time with his wife and son.

Thank you, Caixinha, for being crazy enough to embark on this journey with me, and thank you Paulo, for being the kind of mentor that I could only hope to find one day. To all my Onfido colleagues, it's a pleasure to grow with you everyday .
This book wouldn't have been possible without the love and support of my family and friends.
Ana and Jos, I am blessed to have you in my life.

Daniel Caixinha is a software engineer at Onfido, where he is using Elixir to build resilient systems that can also handle the high growth of the business. After graduating from Instituto Superior Tcnico, he joined the startup world, mainly using Ruby, but also got the chance to play around with Elixir. Upon joining Onfido, he got the chance to take Elixir more seriously, which made him fall in love with functional programming in general, and Elixir in particular. Besides building Elixir applications, he is fostering the use of Elixir, being also a member of the Lisbon Elixir meetup.

First and foremost, this book is dedicated to my soulmate, Raquel, and my son, Gabriel. Without your love, this book wouldn't have been possible. I would also like to thank Onfido in general, but two individuals in particular: Andr, for being in the trenches with me, and Paulo, who fooled me well into believing I could write a book. Last, but definitely not least, I want to thank my parents for always supporting me to be better.
What this book covers

, Preparing for the Journey Ahead , starts our odyssey by introducing Elixir. It starts by covering the data types of Elixir and how pattern matching works, moving on to then explore how to create modules and functions, while also seeing, among other things, how to work with collections and use control flow in Elixir. After reading this chapter, you will be familiar with Elixir's syntax, and how to use it to write some simple functions.

, Innards of an Elixir Project , kicks off by analyzing what makes an Elixir application and what an Elixir project is. It then examines how to use the Mix tool to create projects and manage their dependencies. It's here that we'll create an umbrella project for the ElixirDrip application that will be developed throughout this book.

, Processes The Bedrock for Concurrency and Fault-tolerance , starts by exploring how the BEAM VM works and its concurrency model, the actor model. Then, it shows how to create and work with processes in Elixir, building a piece of the ElixirDrip application as an example. This chapter also explores how to link and monitor processes, and how Supervisors build on top of this to detect crashing processes. Finally, this chapter explores how we can group Supervisors to create supervision trees, which enable the creation of fault-tolerant applications.

, Powered by Erlang/OTP , introduces OTP and examines both the battle-tested OTP abstractions that Elixir inherited from Erlang, such as GenServer and Erlang Term Storage, and the new Agent, Task and Registry abstractions that Elixir brought to life. Each abstraction is put to good use by implementing a media cache, a text search function, and a search results cache.

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