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)

Understanding events and AWS Lambda

Lambda works in a very similar way, as explained in the previous section. For instance, the emitters and channels act as the Lambda event source while the functions that we have been creating all this time act as the event consumers.

All in all, when an event is triggered by a particular AWS service, or even from an external source such as an application, that event gets mapped to a particular Lambda function which in turn, executes an action based on the code that you have written for it. This one-to-one mapping of events with their corresponding Lambda functions is what we call as Event Source Mapping and it is responsible for the automatic invocation of your Lambda functions whenever an event is fired.

There are two main categories of event sources supported by Lambda:

  • AWS services: Lambda supports a few of AWS's services as preconfigured...