Notification Service (AWS Lambda + MongoDB Atlas)

AWS Lambda function which fetches data from MongoDB, notifying MyGovHub users about upcoming & overdue bill payments or documentation renewal reminders. Setup includes 2 seperate AWS Lambda functions.

© 2025 Goodbye World team, for Great AI Hackathon Malaysia 2025 usage.

Project Structure

lambda_functions/
  get_notification/
	 get_notifications.py
	 requirements.txt
  lambda_notification/
	 lambda_notification.py
	 requirements.txt
.gitignore
README.md
requirements.txt

Lambda Functions

1. lambda_notification

• Purpose: Scans MongoDB for overdue/upcoming bills and licenses, and inserts notifications.
• Location: lambda_functions/lambda_notification/lambda_notification.py
• Handler: lambda_notification.lambda_handler

2. get_notification

• Purpose: API endpoint to fetch notifications for a user (for frontend).
• Location: lambda_functions/get_notification/get_notifications.py
• Handler: get_notifications.lambda_handler

Deployment Steps

1. Create Lambda Layer

   • Build a layer with pymongo==4.5.0, dnspython==2.4.2, and pytz.
   • Do NOT commit the python/ folder or layer.zip to Git.
   • Attach this layer to both Lambda functions.

2. Deploy Lambda Functions

   • Zip only the .py file for each function (not the folder).
   • Set the handler as shown above.
   • Set the environment variable MONGO_SECRET_ARN to your Secrets Manager ARN.

3. API Gateway (for get_notification)

   • Create a REST API.
   • Connect the GET method to the get_notification Lambda.
   • Example endpoint:

     GET /notifications?user_name=Alice%20Tan
     

4. MongoDB Atlas

   • Store your connection string in AWS Secrets Manager as a JSON key AtlasMongo.
   • Whitelist Lambda’s IP or use 0.0.0.0/0 for testing.

.gitignore

Your .gitignore is set up to ignore:

• Python cache, virtualenvs
• Lambda layer build artifacts (python/, layer.zip)
• OS/editor files