AWS Event-Driven Order Notification System

This is a simplified backend for an e-commerce platform using event-driven architecture in AWS. It processes incoming orders, stores them in DynamoDB, and sends notifications using SNS, SQS, and Lambda.

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Architecture Overview

Event Flow: Client -> SNS: OrderTopic -> SQS: OrderQueue (DLQ configured) -> AWS Lambda: OrderProcessor -> DynamoDB: Orders Table

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Setup Instructions

1. Create the DynamoDB Table

• Table name: Orders
• Partition key: orderId (String)
• Additional attributes: userId, itemName, quantity, status, timestamp

2. Create SNS Topic

• Name: OrderTopic

3. Create SQS Queues

• OrderQueue (Standard Queue)
• OrderDLQ (Dead-Letter Queue)
• Configure OrderQueue to send failed messages to OrderDLQ after 3 failed receives

4. Subscribe SQS to SNS

• Add OrderQueue as a subscriber to OrderTopic

5. Deploy Lambda Function

• Name: OrderProcessor
• Runtime: Python 3.12
• Trigger: OrderQueue
• IAM Role: Attach the following policies:
  • AmazonDynamoDBFullAccess
  • AmazonSQSFullAccess

6. Lambda Code

Copy the lambda code from the text file in this repository and paste it