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)

Invoking Lambda using an external application

So far, we have seen how to integrate third-party services such as GitHub and Slack with Lambda functions. In this section, we will be looking into yet another simple example where an application is used to invoke a particular Lambda function.

The use case is pretty straightforward--we have a simple Node.js application that accepts any city's name as a parameter and as a response, provides you with the detailed weather conditions of that city. The city name is passed to the Lambda function in the form of an event using SNS. Once the event is provided to the function, it makes a call to an open sourced API called as openweather by passing the city name as a parameter. The API in turn returns the current temperature as well as other miscellaneous weather details of that city. If the current temperature of the city is greater than...