Designing-Microservices-with-Django.pdf

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Front Matter

1. What are services?

2. A Pinch of Django

3. Anatomy of a Microservice

4. Communication

5. From Monolith to Microservice

6. Scaling Development

Back Matter

Akos Hochrein Designing Microservices with Django An Overview of Tools and Practices

Akos Hochrein Berlin, Germany Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the book’s product page, located at www. apress. com/ 978-1-4842-5357-1 . For more detailed information, please visit http:// www. apress. com/ source-code . ISBN 978-1-4842-5357-1 https://doi.org/10.1007/978-1-4842-5358-8 e-ISBN 978-1-4842-5358-8 © Akos Hochrein 2019 Apress Standard Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, logo, or image we use the names, logos, and images only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein. Distributed to the book trade worldwide by Springer Science+Business Media New York, 233 Spring Street, 6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer- sbm.com, or visit www.springeronline.com. Apress Media, LLC is a

California LLC and the sole member (owner) is Springer Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.

For my aunts

Introduction Welcome toDesigning Microservices with Django . I decided to grab a pen and write this book because it was quite difficult for me to find easily digestible guides on how to design microservices, including some of the problems I might face along the way and the potential solutions to them. I kick off this book by clarifying some of the terminology regarding service design. Together, we look at a couple of anecdotes that will help us understand the benefits and drawbacks of certain systems. After that, we dive into Django development and develop an application for ourselves that we talk about later in the book. We examine various high- level concepts such as templates and view functions, in addition to lower level ones, such as permissions and user management. Now armed with knowledge of Django development, we delve deeply into the different types of microservices and the high-level design principles we should follow when we design them. We also take a look at communication principles, such as REST (from the synchronous world) and AMQP (from the asynchronous world), to achieve an understanding of how these protocols work and which ones solve which sorts of problems. Armed with microservice design knowledge, we study the methodologies and techniques of migrating code into smaller systems. To close, we look at how we can scale our development by making tools that make microservices possible to all developers in a company. I hope you are excited about this journey. I certainly am; so let’s get started!

Acknowledgments Writing down thoughts and creating a book is quite a difficult endeavor, and it requires a lot of people and luck to get it done. Luckily, I’ve had both on my side. This is the place where I thank the entire Django community for being there and developing the basis of this book. Thank you! Stay awesome! A thank you is in order to the publisher for helping me along the way and making sure I kept progressing even when I felt like no progress was being made. Thank you. A big thank you is in order for the technical reviewers, Balázs and Csaba. They kept me focused and gave me great feedback on the direction and the contents of the book. They also aided me throughout my career to get to this point, for which I will always be grateful. Thank you! You are truly my friends. I thank my friends here in Berlin and back in Budapest who kept me sane and pushed me through all the creative blocks I had throughout the writing process, even when I needed you to pay for the beer. Thank you. You know who you are. Thanks need to go to my family as well, who encouraged me to follow my dreams and pushed me through difficult times in my life. Thanks Mom, Dad, and Zalán. I’m lucky to have you in my life.

Table of Contents Chapter 1: What are services? Service Lingo Software as a Service Service-oriented Architecture Monolithic Service Microservice Understanding the Monolith Understanding the Microservice Early Design Choices Summary Chapter 2: A Pinch of Django Introducing the Problem Getting Started Django Apps Models and the Power of ORMs What are ORMs? The Pizza Migrations Simple ORM Examples Communication with Views The Admin Panel Logging in, Logging Out and Signing up Signing up Login and Logout A Primer on Middlewares

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