CloudFormation: EventBridge integration with Lambda

Fahim Fahad

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AWS in Plain English

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3 min read

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Jun 3, 2023

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CloudFormation is an AWS service that enables developers to create AWS resources easily, allowing us to reuse the scripts to create resources.

In this article, I will use CloudFormation to create an EventBridge rule that will trigger periodically to publish some data to a Lambda function. I will use a simple lambda just to print the request that we received from EventBridge. Lets begin 🙂

Script

AWSTemplateFormatVersion: '2010-09-09'
Description: >-
  CloudFormation template to integrate EventBridge rule with Lambda
Resources:
  EventRule1:
    Type: AWS::Events::Rule
    Properties:
      EventBusName: default
      Name: test-eb-rule-for-every-3-min
      ScheduleExpression: cron(0/3 * * * ? *)
      State: ENABLED
      Targets:
        - Id: test-eb-rule-1-for-every-3-min
          Arn: >-
            arn:aws:lambda:us-east-1:568560058349:function:fahim-test
          Input: |-
            {
              "body": {
                "type": "test"
              }
            }
  PermissionForEvent0ToInvokeLambda:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: fahim-test
      Action: "lambda:InvokeFunction"
      Principal: "events.amazonaws.com"
      SourceArn:
        Fn::GetAtt:
          - "EventRule1"
          - "Arn"

This is a simple script. We only need a few things to make this work. The first one is the lambda function name and function arn that we will use in the Targets section. In the input section, we…