Automated AWS Bill Reminder System using Serverless Architecture with AWS Lambda

The aim is to develop a serverless system using AWS Lambda to notify users when their AWS bill is pending, to ensure timely payment and avoid disruptions to AWS services.

Components:

• AWS Lambda Functions: Use Lambda functions to periodically check the status of AWS billing and send notifications to users when their bills are pending.
• AWS Billing and Cost Management: Utilize AWS Billing and Cost Management services to retrieve billing information and check the status of pending bills.
• Amazon SNS: Use Amazon Simple Notification Service (SNS) to send email notifications to users when their AWS bills are pending.
• AWS CloudWatch Events: Set up CloudWatch Events to trigger Lambda functions at regular intervals for checking the billing status.
• AWS SDKs: Leverage AWS SDKs (e.g., Boto3 for Python) to interact with AWS services programmatically and automate billing notifications.

Steps to Implement:

Set up IAM Roles:

• To send notifications via Amazon SNS and use AWS Billing and Cost Management services, create an IAM role with the necessary permissions.

Write Lambda Function:

• Develop a Lambda function that retrieves billing information using the AWS SDK.
• Implement logic to check if the bill is pending and trigger a notification if necessary.

Configure CloudWatch Event Rule:

• Set up a CloudWatch Event rule to trigger the Lambda function at regular intervals (e.g., daily, weekly) to check the billing status.

Implement Notification Logic:

• Use the SNS service to send email notifications to users when their AWS bills are pending.
• Customize the notification message with relevant billing details and instructions for payment.

Handle Error Cases:

• Incorporate error handling into the Lambda function to handle exceptions, including failed service requests and incorrectly retrieved billing data.
• Configure appropriate logging and monitoring using CloudWatch to track function executions and errors.

Testing:

• Test the Lambda function and CloudWatch Event rule to ensure they trigger notifications correctly based on the billing status.
• Verify that users receive notifications as expected and that the notification content is accurate.

Deployment:

• Deploy the Lambda function and CloudWatch Event rule in the AWS account where billing notifications are required.
• Configure necessary permissions and IAM roles for the Lambda function to access AWS Billing and SNS services.

Monitor and Maintain:

• Monitor the execution of Lambda functions and CloudWatch Events to ensure they run as scheduled and handle any failures or exceptions promptly.
• Periodically review and update the system to accommodate changes in AWS billing policies or user requirements.

Lambda Function:

import json import boto3 def lambda_handler(event, context): # Initialize AWS services sns_client = boto3.client('sns') billing_client = boto3.client('ce') # AWS Cost Explorer # Retrieve billing information response = billing_client.get_cost_and_usage( TimePeriod={ 'Start': '2024-01-01', 'End': '2024-03-01' # Modify the date range as needed }, Granularity='MONTHLY', Metrics=['UnblendedCost'] # You can customize the metrics as needed ) # Extract the total cost for the current billing period total_cost = float(response['ResultsByTime'][0]['Total']['UnblendedCost']['Amount']) # Check if the bill is pending (total cost > 0) if total_cost > 0: # Send notification topic_arn = 'arn:aws:sns:ap-south-1:965519929135:awsBillNotification' # Replace with your SNS topic ARN message = f'Your AWS bill for the current month is pending. Total amount due: ${total_cost:.2f}' subject = 'Action Required: Your AWS Bill is Pending' sns_client.publish( TopicArn=topic_arn, Message=message, Subject=subject ) print('Billing notification sent successfully') else: print('No pending bills found') return { 'statusCode': 200, 'body': 'Billing notification process completed' } 

Testing:

Output:

Find me Online!