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:
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