☁️ AWS Lesson 05 — Lambda (Serverless)

1. Lambda ဆိုတာ

2. First Lambda Function

# Lambda → Create function
# Name: hello-function
# Runtime: Python 3.12
# Click Create

# lambda_function.py (editor မှာ ရေး)
import json

def lambda_handler(event, context):
    name = event.get('name', 'World')

    return {
        'statusCode': 200,
        'body': json.dumps({
            'message': f'Hello, {name}!',
            'status': 'success'
        })
    }

# Test event
{
  "name": "Ko Min"
}

3. API Gateway + Lambda = REST API

# API Gateway → Create API → HTTP API
# Add integration: Lambda function ရွေး
# Route: GET /hello
# Deploy → URL ရမယ်

# Lambda function (Node.js example)
exports.handler = async (event) => {
    const name = event.queryStringParameters?.name || 'World'

    return {
        statusCode: 200,
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ message: `Hello, ${name}!` })
    }
}

# Call the API
# GET https://abc123.execute-api.ap-southeast-1.amazonaws.com/hello?name=Ko+Min
# Response: {"message": "Hello, Ko Min!"}

4. Lambda Triggers

5. Scheduled Lambda (Cron)

# EventBridge → Rules → Create rule
# Schedule: cron(0 9 * * ? *)  ← every day 9am UTC
# Target: Lambda function

# Cron examples
cron(0 9 * * ? *)      # Every day at 9am UTC
cron(0/5 * * * ? *)   # Every 5 minutes
cron(0 0 1 * ? *)     # First day of month

# Use case: Daily email report, cleanup old data, backup