AWS Lambda Learning Project

This project demonstrates how to create, deploy, and test AWS Lambda functions using different deployment methods:

1. Plain Lambda Function: A simple Lambda function with external dependencies packaged in a zip file
2. Docker Image Lambda Function: A Lambda function packaged as a Docker container
3. Lambda Function with Layers: A Lambda function that uses Lambda layers for dependencies and demonstrates proper package importing

Project Structure

finally-learn-lambda/
├── README.md                # This file
├── cdk-app/                 # AWS CDK application for deployment
│   ├── app.py               # CDK application entry point
│   ├── cdk_stack.py         # CDK stack definition
│   └── requirements.txt     # CDK dependencies
├── lambda-functions/        # Lambda function implementations
│   ├── plain-lambda/        # Simple Lambda implementation
│   │   ├── lambda_function.py # Function code
│   │   └── requirements.txt # Dependencies
│   ├── docker-lambda/       # Docker-based Lambda
│   │   ├── Dockerfile       # Docker configuration
│   │   ├── lambda_function.py # Function code
│   │   └── requirements.txt # Dependencies
│   └── layer-lambda/        # Lambda with layers
│       ├── src/             # Lambda function code
│       │   ├── lambda_function.py # Main function
│       │   └── utils/       # Local imports example
│       │       └── helper.py # Helper module
│       └── layers/          # Lambda layers
│           └── dependencies/ # Dependencies layer
└── template.yaml           # AWS SAM template for local testing

Prerequisites

• AWS CLI installed and configured
• AWS CDK CLI installed (npm install -g aws-cdk)
• Python 3.8+ installed
• Docker installed (for Docker-based Lambda and SAM local testing)
• AWS SAM CLI installed

Setup Instructions

1. Set up a virtual environment:

python -m venv .venv
source .venv/bin/activate  # On Windows: .venv\Scripts\activate

2. Install CDK dependencies:

cd cdk-app
pip install -r requirements.txt

3. Bootstrap CDK (if you haven't already):

cdk bootstrap

Deployment

To deploy all Lambda functions:

cd cdk-app
cdk deploy

Local Testing

To test the Lambda functions locally:

sam local invoke PlainLambdaFunction -e events/event.json
sam local invoke DockerLambdaFunction -e events/event.json
sam local invoke LayerLambdaFunction -e events/event.json

Step-by-Step Guide

See the detailed sections below for explanations on each Lambda function type.