Sergio Guerrero - Microservices in SAP HANA XSA: A Guide to REST APIs Using Node.js

Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/978-1-4842-6117-0 . For more detailed information, please visit http://www.apress.com/source-code .

Microservices are being developed to address application issues that businesses face today, such as monolithic architectures, being able to develop and deploy software between different platforms, and being able to quickly respond to business events. It is now possible to develop node microservices with the introduction of the advanced architecture in SAP HANA. This book is intended to show the development cycle, debugging, and deployment of Node JS microservices in the SAP HANA platform. Some tools and ways of utilizing them are showcased in the interest of helping the reader to feel comfortable in developing their next enterprise-ready microservice/REST API in SAP HANA. At the end of the book, the reader will have completed building a REST API using commonly used HTTP methods such as GET, POST, and DELETE while using data models exposed as calculation views to read data or by calling stored procedures to update, insert, or delete records.

Chapter provides an overview of the SAP HANA architecture and how its advanced architecture is based on Cloud Foundry concepts.

Chapters start with the security model to understand how security is implemented following the Cloud Foundry architecture and how it is utilized during the book exercise. The book continues with building database objects such as tables, calculation views, and stored procedures. Then, the REST API is built using the Node JS language. All API endpoints are unit tested via POSTMAN (free tool). Debugging occurs from the Web IDE on Node JS code and on the stored procedures to debug SQL.

Chapter concludes the book explaining software versioning, deployments from the SAP Web IDE, and scenarios to scale the microservices from the HANA Cockpit for XSA development.

All source code is available on GitHub via the books product page, located at www.apress.com/978-1-4842-6117-0 . For more detailed information, please visit www.apress.com/source-code .

I am thankful to my wife, Amy, for her support and encouragement while writing this book and in my personal life above all circumstances. Thank you for listening to me ramble sometimes. I am very humbled and grateful for the Apress team, Divya and Laura, for reaching out, and the technical reviewers, Attaphon Predaboon and Murlli Maraati, for providing a different perspective while writing this book, for their support, and for guiding me through the journey of this professional achievement.