Schedule AWS lambda in a interval with immediately trigger

Question

To run lambda in an interval, I could use EventBridge rule: https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-create-rule-schedule.html

For example, if I set the rule to 7 days, the lambda will execute at 7 days after the lambda is created.

What if I need to run this lambda immediately after its creation and also run this lambda in an interval?

How can I do this programmatically or in CDK?

Answer 1

Note: This solution only works for those who use AWS CodeBuild to deploy their Lambdas.

In this sample project (https://github.com/dashmug/us-covid-stats) I did a while back, I configured the Lambda to also have another trigger based on CodeBuild's "Build Succeeded" event.

In https://github.com/dashmug/us-covid-stats/blob/main/backend/serverless.yml#L71,

RefreshDataFromSources:
    handler: us_covid_stats/etl/handler.refresh_data_from_sources
    events:
      - schedule:
          enabled: false
          rate: rate(1 day)
      - cloudwatchEvent:
          enabled: false
          event:
            source:
              - aws.codebuild
            detail-type:
              - CodeBuild Build State Change
            detail:
              build-status:
                - SUCCEEDED
              project-name:
                - us-covid-stats-deployment-backend

you'll see that the Lambda is normally triggered once daily. But also on top of the daily schedule, it is triggered when the deployment succeeds.