Task-4 : Added DynamoDB and Lambda Function for creating Product

[Lunarr0]

Task 4 - AWS DynamoDB and Lambda Integration

Description

This PR implements Task 4 requirements, including creating and populating DynamoDB tables, extending the AWS CDK stack, integrating Lambda functions, and setting up API Gateway endpoints for interaction with the Product Service.

Implemented Features

✅ Task 4.1: Create DynamoDB Tables and Populate with Data

• Created two DynamoDB tables: products and stocks.
• Populated tables with test data using a script.
• The script is available in the repository: link-to-script.

✅ Task 4.2: Extend AWS CDK Stack and Implement Lambda Functions

• Extended the AWS CDK Stack with database table details.
• Passed table details as environment variables to Lambda functions.
• Implemented getProductsList Lambda to fetch products with stock information.
• Implemented getProductsById Lambda to return a single product by ID.
• Products and stocks are joined on product_id to provide a single unified response.
• API Endpoints:
  • GET /products → [Invoke] (API-Gateway-URL-for-getProductsList)
  • GET /products/{productId} → [Invoke] (API-Gateway-URL-for-getProductsById)

✅ Task 4.3: Implement createProduct Lambda

• Implemented createProduct Lambda to add new products.
• The function handles adding a new product and its stock transactionally.
• API Endpoint:
  • POST /products → [Invoke](API-Gateway-URL-for-createProduct)

✅ Task 4.4: Integration with Frontend Application

• Integrated the /products API with the Frontend.
• Products from the backend are displayed in the Frontend.
• Live Frontend Application: [Link to frontend](Frontend-Deployment-URL)

Error Handling and Logging

• 400 Status Code: Returns if product data is invalid during creation.
• 500 Status Code: Handles unexpected errors gracefully.
• Logging: All Lambda functions log incoming requests and their arguments.
• Transactional Product Creation: Ensures that if stock creation fails, the related product is not created and vice versa.

How to Test

1. Fetch all products

   curl -X GET https://pj8m5nmg5m.execute-api.us-east-1.amazonaws.com/prod/products/

   Response Example:

       {
          "description": "Organic plant-based protein.",
          "id": "e0c7c4c2-0e28-4b2e-8cbf-7a7344ca93ac",
          "price": 29,
          "title": "Vegan Protein Powder",
          "count": 10
      },
     {
        "description": "Organic plant-based protein.",
        "id": "123e4567-e89b-12d3-a456-426614174000",
        "price": 29,
        "title": "Vegan Protein Powder",
        "count": 50
       }

2. Fetch product by ID

   curl -X GET https://pj8m5nmg5m.execute-api.us-east-1.amazonaws.com/prod/products/{productId}

   Response Example:

       {
          "description": "Organic plant-based protein.",
          "id": "e0c7c4c2-0e28-4b2e-8cbf-7a7344ca93ac",
          "price": 29,
          "title": "Vegan Protein Powder",
          "count": 10
      }

3. Create a new product

   curl -X POST https://pj8m5nmg5m.execute-api.us-east-1.amazonaws.com/prod/products/
        -H "Content-Type: application/json" \
        -d '{"title": "New Product", "description": "Test Description", "price": 150, "count": 10}'

Submission Details

• Backend PR: [Link to Backend PR](Backend-Repo-PR-URL)
• Frontend PR : [Link to Frontend PR](Frontend-Repo-PR-URL)
• Live API Gateway URLs for testing are provided above.
• Cross-check reviewers can verify functionality using provided endpoints.

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🚀 Ready for Review! Please let me know if you have any questions. 😊