Javascript on AWS Lambda
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Javascript on AWS Lambda

How to use Node.js in a serverless architecture

About the Book

This books helps you bring what you already know --- programming in Javascript with Node.Js --- to AWS Lambda.

Developing serverless applications is frustrating at first. Up until the "Hello world" everything is easy, but then a lot of small differences come to the surface. Things like why some requests are way slower than others, how to set the available memory, and why a sensible timeout is important. These are the results of how the Lambda execution environment works, and it is markedly different from running Node.Js on a server.

And it's not just how the function is run, but also what other services it interacts with. CloudWatch and Logs, IAM, and API Gateway, not to mention a database most functions will use. It's overwhelming at first.

This book systematically walks you through the configuration options and gives just the right amount of background information so that you'll know what parts are important. With it, you'll be able to set up your Lambda functions using best practices and avoid the common problems.

You'll:

* Understand how the Lambda execution environment works

* Learn how to write Javascript serverless functions

  • * And walk away with knowledge about debuggers and HTTP APIs

About the Author

Tamás Sallai
Tamás Sallai

Given a task that requires writing software, an expert provides better and more reliable solutions. I write articles and books to help you be that expert.

I'm a software developer focusing mostly on cloud computing and web technologies. I'm especially interested in how to handle edge cases to end up with dependable software. One of my main focus is security and how each part affects the whole system.

I co-author the advancedweb.hu blog where I've published more than a hundred technical articles.

Table of Contents

  • Introduction
  • The Lambda execution model
    • Serverless functions
    • Limits
    • The cost model
    • At-least-once execution
    • Caching in /tmp
    • Cold start
    • Memory
  • Setup
    • Node versions
    • The Lambda permission model
    • How to define code
      • Inline code
      • File interpolation
      • Adding packages with npm
    • Handler argument
  • Programming model
    • Async handler
      • Async programming patterns
      • Background tasks
    • Input and output
      • The event object
      • The context object
      • Output
    • The AWS SDK
      • Pagination
    • Environment variables
    • Timeout
      • Cause of timeouts
      • Mitigating timeouts
        • AWS SDK timeouts
        • Promise-based timeout handling
  • Debugging
    • Logging
    • X-Ray
      • Custom segments
  • Other topics
    • Storing secrets
      • Using SSM
      • Caching
        • Cache time
    • HTTP API
      • OpenAPI backend
        • Request parameters
        • Special handlers
      • Express backend
  • About the author

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