Amazon EventBridge to Amazon CloudWatch

This project contains a sample AWS CDK template to create an EventBridge Rule, as well as, a CloudWatch Logs Group. The EventBridge Rule publishes matched events to CloudWatch Logs. In this example, the rule filters for specific attributes in the event before sending to the CloudWatch Logs target. Note: CDK may automatically create a Custom Resource Lambda to set certain policy configurations for CloudWatch Logs.

Learn more about this pattern at Serverless Land Patterns: https://serverlessland.com/patterns/eventbridge-cloudwatch-cdk

Important: this application uses various AWS services and there are costs associated with these services after the Free Tier usage - please see the AWS Pricing page for details. You are responsible for any AWS costs incurred. No warranty is implied in this example.

Requirements

• Create an AWS account if you do not already have one and log in. The IAM user that you use must have sufficient permissions to make necessary AWS service calls and manage AWS resources.
• AWS CLI installed and configured
• Git Installed
• Node and NPM installed
• Python, pip, virtuenv installed
• AWS Cloud Development Kit (AWS CDK) installed

Deploy

1. Clone the project to your local working directory

   git clone https://github.com/aws-samples/serverless-patterns

2. Change the working directory to this pattern's directory

   cd eventbridge-cloudwatch-cdk/cdk

3. Create and activate the project's virtual environment. This allows the project's dependencies to be installed locally in the project folder, instead of globally. Note that if you have multiple versions of Python installed, where the python command references Python 2.x, then you can reference Python 3.x by using the python3 command. You can check which version of Python is being referenced by running the command python --version or python3 --version

    python -m venv .venv
    source .venv/bin/activate

4. Install the project dependencies

   python -m pip install -r requirements.txt

5. Deploy the stack to your default AWS account and region.

   cdk deploy

How it works

The CDK stack deploys the resources and the IAM permissions required to run the application.

The EventBridge Rule specified in app.py which filters the events based upon the criteria in the rule.add_event_pattern method. When matching events are sent to the custom EventBridge Bus that trigger the Rule, they are published to the CloudWatch Logs Group.

Testing

Use the AWS CLI to send a test event to EventBridge and observe the event delivered to the Lambda function by reviewing the Amazon CloudWatch Logs associated with the function:

1. Send an event to the custom EventBridge Bus. Note that Custom Bus Name is in the event.json file) :

aws events put-events --entries file://event.json

2. Check the CloudWatch Logs, referencing the log group name from the Outputs section of the deployed Stack, to see an event matching this example:

{
    "version": "0",
    "id": "1a1123ab-ab1c-1abc1-1abc-a111abcd12345",
    "detail-type": "message",
    "source": "my-cdk-application",
    "account": "123456789012",
    "time": "2021-09-27T20:14:09Z",
    "region": "us-west-2",
    "resources": [],
    "detail": {
        "message": "Hello CDK world!"
    }
}

Cleanup

Run the given command to delete the resources that were created. It might take some time for the CloudFormation stack to get deleted.

cdk destroy

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