How do I configure an AWS CloudWatch Event Rule with Pulumi?

In this guide, we will configure an AWS CloudWatch Event Rule using Pulumi in TypeScript. AWS CloudWatch Event Rules allow you to respond to events in your AWS environment by triggering actions such as invoking a Lambda function, sending a notification, or starting an EC2 instance. We will create a CloudWatch Event Rule that triggers based on a schedule expression.

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Create a new CloudWatch Event Rule
const eventRule = new aws.cloudwatch.EventRule("exampleEventRule", {
    description: "An example event rule that triggers every 5 minutes",
    scheduleExpression: "rate(5 minutes)"
});

// Create a new CloudWatch Event Target
const eventTarget = new aws.cloudwatch.EventTarget("exampleEventTarget", {
    rule: eventRule.name,
    arn: "arn:aws:lambda:us-west-2:123456789012:function:my-function", // Replace with your Lambda function ARN
});

// Grant permissions to CloudWatch to invoke the Lambda function
const lambdaPermission = new aws.lambda.Permission("exampleLambdaPermission", {
    action: "lambda:InvokeFunction",
    function: "my-function", // Replace with your Lambda function name
    principal: "events.amazonaws.com",
    sourceArn: eventRule.arn,
});

// Export the name of the event rule
export const eventRuleName = eventRule.name;

Key Points:

• We used the aws.cloudwatch.EventRule resource to create a new CloudWatch Event Rule.
• The scheduleExpression parameter is set to trigger the rule every 5 minutes.
• We created an aws.cloudwatch.EventTarget to specify the target action for the event rule, in this case, invoking a Lambda function.
• We granted the necessary permissions to CloudWatch to invoke the Lambda function using the aws.lambda.Permission resource.

Summary:

We successfully configured an AWS CloudWatch Event Rule using Pulumi in TypeScript. The event rule is set to trigger every 5 minutes and invoke a specified Lambda function. This setup allows you to automate responses to events in your AWS environment.