Serverless AWS Lambda in Practice: The Code and Commands That Really Matter

Table 1 : Products
─────────────────────────────────────
| productId (PK) | name | category | price | quantity | alert_threshold |
─────────────────────────────────────

Table 2 : Movements
─────────────────────────────────────
| movementId (PK) | productId | type (in/out) | quantity | date |
─────────────────────────────────────

Utilisateur
    │
    ▼
┌──────────┐     ┌───────────────┐     ┌──────────┐
│  S3      │     │ API Gateway   │     │ DynamoDB │
│ Frontend │────▶│  REST API     │────▶│ Tables   │
│ HTML/JS  │     │  /produits    │     │          │
└──────────┘     │  /mouvements  │     └──────────┘
                 └───────┬───────┘
                         │
                    ┌────▼────┐
                    │ Lambda  │
                    │ Python  │
                    └─────────┘

mon-projet-serverless/
├── template.yaml
├── src/
│   ├── handlers/
│   │   ├── __init__.py
│   │   ├── produits.py
│   │   └── mouvements.py
│   ├── utils/
│   │   ├── __init__.py
│   │   ├── response.py
│   │   └── validation.py
│   └── requirements.txt
└── frontend/
    ├── index.html
    ├── style.css
    └── app.js

SAM CLI, version 1.120.0

Which template source would you like to use?
  1 - AWS Quick Start Templates
  2 - Custom Template Location
Choice: 1

Choose an AWS Quick Start application template
  1 - Hello World Example
  2 - Data processing
  3 - Hello World Example with Powertools
  ...
Template: 1

Use the most popular runtime and package type? (python3.12 and zip)
  y

Would you like to enable X-Ray tracing on the function(s)?
  y

Would you like to enable monitoring using CloudWatch Application Insights?
  y

Would you like to set Structured Logging in JSON format on your Lambda functions?
  y

Project name [sam-app]: mon-api-serverless

mon-api-serverless/
└── README.md
└── __init__.py
└── events/
│   └── event.json          # Test event
└── hello_world/
│   └── __init__.py
│   └── app.py              # Lambda function code
│   └── requirements.txt    # Python dependencies
└── template.yaml               # SAM template
└── samconfig.toml              # Deployment config
└── tests/
    └── __init__.py
    └── unit/
        └── test_handler.py     # Unit tests