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AWS Lambda Quick Start Guide
AWS Lambda Quick Start Guide

AWS Lambda Quick Start Guide: Learn how to build and deploy serverless applications on AWS

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AWS Lambda Quick Start Guide

Exploring the Serverless Framework

In the previous chapter, we learned how to use the AWS Management Console to create Lambda functions and APIs. Now, we will use the Serverless framework to programmatically create APIs and Lambda functions. We will use the serverless command-line interface to deploy and test our functions. This will tremendously speed up our development processes.

The term serverless generally refers to applications that make heavy use of third-party cloud services, such as AWS Lambda. These services are also sometimes referred to as cloud functions, serverless microservices, or serverless functions. This doesn't mean that there are no servers involved anymore, just that you haven't installed to manage and operate these servers yourself. This is handled by the cloud provider, who takes care of things like scalability, high availability, security, performance...

The Serverless framework

Here, we are going to take a look at the Serverless framework documentation. We will then take a look at how to install it, and then we'll try out our first commands.

Go to the main landing page of the Serverless framework, serverless.com.

To find all the information that you need, click on Quick Start Docs. For now, let's take a quick look at the installation section. The first thing that you need to have installed is Node.js, and you will find some information on how to install it on your local machine. For programming serverless, we need Node.js version 4 or higher. If you don't have Node.js already, please do so now, and then resume.

Serverless runs on Node 4 or higher. For installing, go to the official Node.js website, download, and follow the installation instructions. If you want to see if Node has been installed successfully, just...

Creating a serverless project

In the previous section, we installed the Serverless framework and tried out the command line. Now, let's create our first serverless project. We are going to use the Serverless framework to create a simple Node.js lambda function and a REST API. Open Terminal and create a directory where you can place your serverless project files. I named it app, but you can name it whatever you want. Go to that directory and open your preferred IDE. I used the Atom editor. When the Atom editor was opened in my empty directory, I used an Atom package at terminal plus to open a new Terminal window inside my IDE. This makes it easier because I don't need to switch between writing code and typing in commands. So, let's type in a command to scaffold a serverless service:

serverless create --template aws-nodejs

The command for creating a service is created...

Programming a Lambda function with Node.js

Now, let's learn a little bit more about programming Lambda functions with Node.js. We are going to take a closer look at the function handler, and in particular its arguments, that is:

  • Event objects
  • Context objects
  • Callback objects

Open the handler.js file and delete the code that's in the function body. One way to learn about the event and context object would be to log them out on the console:

'use strict';
module.exports.hello = (event, context, callback) => {
console.log('event is', event);
};

Let's see what this gives us.

I am invoking the function locally to see what the output is with the function name set as hello:

sls invoke local -f hello
event is

Ok, my event, apparently, is null. Let's see what the context is, as shown next:

module.exports.hello = (event, context, callback) =&gt...

Testing and debugging Lambda functions

In the previous section, we learned about programming Lambda function handlers. Now, let's explore testing and debugging.

Here, we are going to look at three different testing and debugging approaches:

  • Using the Serverless framework
  • Using Postman for testing our API
  • Using the AWS Management Console

Let's go back to our handler.js file from the previous section. There are a couple things that should be changed. The response method should be changed back to something that our API can work with.

Give it a body property with a stringify JSON content, as shown here:

body: JSON.stringify({

And, in the JSON content, get back the event in the remaining time from the context, and then, instead of returning an error, we will return the response:

'use strict';
module.exports.hello = (event, context, callback) => {
let remainingTime...

Summary

In this chapter, we learned how to use the Serverless framework to create and test Lambda functions and APIs, and we tried out different approaches for API testing, Lambda testing, and debugging. Now, we have all the things necessary to build a real application, so in the next chapter, that's what we are going to do, by building a serverless application.

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Key benefits

  • Learn to write, run, and deploy Lambda functions in the AWS cloud
  • Make the most of AWS Lambda functions to build scalable and cost-efficient systems
  • A practical guide to developing serverless services and applications in Node.js, Java, Python, and C#

Description

AWS Lambda is a part of AWS that lets you run your code without provisioning or managing servers. This enables you to deploy applications and backend services that operate with no upfront cost. This book gets you up to speed on how to build scalable systems and deploy serverless applications with AWS Lambda. The book starts with the fundamental concepts of AWS Lambda, and then teaches you how to combine your applications with other AWS services, such as AmazonAPI Gateway and DynamoDB. This book will also give a quick walk through on how to use the Serverless Framework to build larger applications that can structure code or autogenerate boilerplate code that can be used to get started quickly for increased productivity. Toward the end of the book, you will learn how to write, run, and test Lambda functions using Node.js, Java, Python, and C#.

Who is this book for?

This book is primarily for IT architects and developers who want to build scalable systems and deploy serverless applications with AWS Lambda. No prior knowledge of AWS is necessary.

What you will learn

  • • Understand the fundamental concepts of AWS Lambda
  • • Get to grips with the Serverless Framework and how to create a serverless project
  • • Testing and debugging Lambda functions
  • • Create a stateful, serverless backend with DynamoDB
  • • Program AWS Lambda with Java, Python, and C#
  • • Program a lambda function with Node.js
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Publication date : Jun 29, 2018
Length: 184 pages
Edition : 1st
Language : English
ISBN-13 : 9781789340198
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Table of Contents

7 Chapters
Getting Started with AWS Chevron down icon Chevron up icon
Exploring the Serverless Framework Chevron down icon Chevron up icon
Building a Serverless Application Chevron down icon Chevron up icon
Programming AWS Lambda with Java Chevron down icon Chevron up icon
Programming AWS Lambda with Python Chevron down icon Chevron up icon
Programming AWS Lambda with C# Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

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