Guided Lab: Creating an Amazon EventBridge DynamoDB Event Rule

1. Navigate to the DynamoDB service in the AWS Management Console.

2. Create a new table with the following configurations:

• Table name: MyDynamoDBTable
• Primary key: ID (String)
• Table settings: Select Default settings
• Scroll down and click Create table

3. Ensure the table status is set to Active before proceeding to the next step.

1. Navigate to the AWS Lambda Console

2. Create a new Lambda function using the following configurations:

• Choose Author from scratch.
• Function name: myLambdaFunction
• Select Python 3.12 as the runtime.
• Execution role:
  • Select Use an Existing Role: PlayCloud-Sanbox

• Click Create function

3. Replace the existing code with the following:

Note: We are using the old console editor for this lab. You can switch to the new editor as you desire; the process remains the same, but the interface may look slightly different.

import json

def lambda_handler(event, context):
    print("DynamoDB Event received:", json.dumps(event))
    return {
        'statusCode': 200,
        'body': 'Event processed successfully'
    }

The Lambda function code is a basic setup to handle and log events from a DynamoDB table. It imports the json module to format the event data and defines the lambda_handler function automatically triggered by Amazon EventBridge when a DynamoDB event occurs. The event parameter contains details about the DynamoDB events, such as turning on or off the deletion protection. The function logs this event data to Amazon CloudWatch for monitoring and debugging, making it easy to verify the events. Finally, the function returns a successful response, confirming that the event was processed. 

4.  Click Deploy to save the changes.

1. Navigate to the EventBridge Dashboard.

2. Click on Rules in the left navigation pane.

3. Click Create rule.

4. Configure the rule with the following details:

• Name: MyDynamoDBEventRule
• Description: Rule to capture DynamoDB table events
• Rule type: Rule with an event pattern
• Event Source: Choose AWS services
• Service Name: Select DynamoDB
• Event Type: All Events (for the simplicity of the lab)

• Click Next to proceed.

5. Set the Target for the Rule

• For the Target type, select AWS service
• Under Select target, choose Lambda function.
• In the Function dropdown, select myLambdaFunction.

6. Click on Skip to Review and create. Take your time to double-check all the entered details carefully.

7. Scroll down and click Create rule.

1. Go to the Amazon DynamoDB Console and perform an action that triggers an event, such as Turn on deletion protection.

• A confirmation message will appear; click Confirm.

2. Wait for it to finish. 

3. Navigate to the Lambda Function (myLambdaFunction) created earlier. Then,  click on the Monitor tab and click on View CloudWatch logs.

• You will be redirected to the CloudWatch logs for this lambda function. Scroll down and view the latest log stream. Check the log stream to see the event details.

Congratulations! You have successfully created an Amazon EventBridge rule that captures events from a DynamoDB table and triggers a Lambda function. This setup enables you to automate workflows and react to data changes in real-time.

Key Takeaways:

• EventBridge and DynamoDB integration allow for automated, event-driven architecture.
• Using Lambda as a target provides a serverless way to process and act on DynamoDB events.
• CloudWatch logs help you monitor and debug your event-driven workflows.

As a final step, remember it’s always a best practice to clean up resources after completing a lab. Deleting unused resources will help maintain a clutter-free AWS environment.

Happy learning!!!