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AWS Lambda Handler Cookbook - A Serverless Service Template

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The Problem

Starting a Serverless service can be overwhelming. You need to figure out many questions and challenges that have nothing to do with your business domain:

  • How to deploy to the cloud? What IAC framework do you choose?
  • How to write a SaaS-oriented CI/CD pipeline? What does it need to contain?
  • How do you handle observability, logging, tracing, metrics?
  • How do you handle testing?
  • What makes an AWS Lambda handler resilient, traceable, and easy to maintain? How do you write such a code?

The Solution

This project aims to reduce cognitive load and answer these questions for you by providing a skeleton Python Serverless service template

that implements best practices for AWS Lambda, Serverless CI/CD, and AWS CDK in one template project.

Serverless Service - The Order service

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  • This project provides a working orders service where customers can create orders of items.

  • The project deploys an API GW with an AWS Lambda integration under the path POST /api/orders/ and stores orders data in a DynamoDB table.

Features

  • Python Serverless service with a recommended file structure.
  • CDK infrastructure with infrastructure tests and security tests.
  • CI/CD pipelines based on Github actions that deploys to AWS with python linters, complexity checks and style formatters.
  • The AWS Lambda handler embodies Serverless best practices and has all the bells and whistles for a proper production ready handler.
  • AWS Lambda handler uses AWS Lambda Powertools.
  • Unit, integration and E2E tests.

The GitHub template project can be found at https://github.com/ran-isenberg/aws-lambda-handler-cookbook.

Serverless Best Practices

The AWS Lambda handler will implement multiple best practice utilities.

Each utility is implemented when a new blog post is published about that utility.

The utilities cover multiple aspects of a production-ready service, including:

While the code examples are written in Python, the principles are valid to any supported AWS Lambda handler programming language.

The Blog Series

The template is based on my AWS Lambda handler cookbook blog series that I published at ranthebuilder.cloud.

License

This library is licensed under the MIT License. See the LICENSE file.


Last update: 2023-02-03