Task 4 (Integration with NoSQL Database)

[Tati-Moon]

Task 4

https://github.com/rolling-scopes-school/aws/blob/main/aws-developer/04_integration_with_nosql_database/task.md

Links

• Product Service API
• Product Service API for id = 9d95ed83-29a3-498c-8b57-51243720f3f4
• Curl for adding a new item

curl -X POST https://s0ob4l26k9.execute-api.us-east-1.amazonaws.com/prod/products \
-H 'accept: application/json' \
-H 'Content-Type: application/json' \
-d '{
  "title": "some new title",
  "description": "some new description",
  "price": 11,
  "count": 22
}'

• Frontend
• Swagger

Evaluation Criteria

• 100/100

###Additional Scope (+30 points)

• +7.5 (All languages) - POST /products lambda functions returns error 400 status code if product data is invalid
• +7.5 (All languages) - All lambdas return error 500 status code on any error (DB connection, any unhandled error in code)
• +7.5 (All languages) - All lambdas do console.log for each incoming requests and their arguments
• +7.5 (All languages) - Transaction based creation of product (in case stock creation is failed then related to this stock product is not created and not ready to be used by the end user and vice versa) (https://devcenter.kinvey.com/nodejs/tutorials/bl-transactional-support, https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/transaction-apis.html)

Task 4.1

1. Created two DynamoDB tables:
   • products table with fields:
     • id (uuid, Primary key)
     • title (text, not null)
     • description (text)
     • price (integer)
   • stocks table with fields:
     • product_id (uuid, Foreign key referencing products.id)
     • count (integer, representing total stock count)

2. Added items.

Task 4.2

1. Updated AWS CDK Stack:

   • Created DynamoDB tables (products and stocks).
   • Updated Lambda’s environment variables.

2. Integrated getProductsList Lambda:

   • Returns list of products via GET /products endpoint from DynamoDB.
   • Implemented joining of products and stocks tables.

3. Implemented Product model:
   • Combined product and stock data into a single model (Product).

Task 4.3

1. Created createProduct Lambda function:
   • Triggered by HTTP POST method.
   • Implements logic to create a new item in products table.

2. Curl for add new product:

curl -X POST https://s0ob4l26k9.execute-api.us-east-1.amazonaws.com/prod/products \
-H 'accept: application/json' \
-H 'Content-Type: application/json' \
-d '{
  "title": "some new title",
  "description": "some new description",
  "price": 11,
  "count": 22
}'

Task 4.4

1. Committed changes to new branch

Additional Tasks

• Error Handling:
  • Implemented error handling:
    • Returns 400 status code for invalid product data.
    • Returns 500 status code for any unhandled errors.

• Logging:

  • Added console.log for each incoming request and their arguments.

• Transactions:

  • Implemented transaction-based creation of products and stocks to ensure data integrity.