Book Image

Mastering AWS Lambda

By : Yohan Wadia, Udita Gupta
Book Image

Mastering AWS Lambda

By: Yohan Wadia, Udita Gupta

Overview of this book

AWS is recognized as one of the biggest market leaders for cloud computing and why not? It has evolved a lot since the time it started out by providing just basic services such as EC2 and S3 and today; they go all the way from IoT to Machine Learning, Image recognition, Chatbot Frameworks, and much more! One of those recent services that is also gaining a lot of traction is AWS Lambda! Although seemingly simple and easy to use, Lambda is a highly effective and scalable compute service that provides developers with a powerful platform to design and develop Serverless event-driven systems and applications. The book begins with a high-level introduction into the world of Serverless computing and its advantages and use cases, followed by a deep dive into AWS Lambda! You’ll learn what services AWS Lambda provides to developers; how to design, write, and test Lambda functions; as well as monitor and troubleshoot them. The book is designed and accompanied with a vast variety of real-world examples, use cases, and code samples that will enable you to get started on your Serverless applications quickly. By the end of the book, you will have gained all the skills required to work with AWS Lambda services!
Table of Contents (11 chapters)

Testing with a simple serverless test harness

So far we have seen how simple and easy it becomes to test your Lambda functions out locally, right? But what happens once those Lambda functions are deployed on the cloud? How do you test those out? Don't worry, that's where Lambda can help out as well!

Our good folks at AWS have also provided us with a simple, customizable, and easy to use test harness function blueprint that in essence invokes unit test cases over other Lambda functions that are being tested, and stores the results of the tests in either DynamoDB, Kinesis or even S3 for that matter. The best part of this entire test harness is that you don't even bother about any of the underlying infrastructure, whether it's creating new resources for testing or shutting them down once the testing is over! It's all taken care by lambda itself!

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