# Delayed EventBridge events with EventBridge Scheduler
This pattern listens for EventBridge events, processes them and creates schedules for every user. 24 hours after user has been created a schedule is run that publishes events directly into EventBridge

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

For more details you can read the [pattern README](./cdk/README.md);

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](https://aws.amazon.com/pricing/) for details. You are responsible for any AWS costs incurred. No warranty is implied in this example.


## Requirements

- [Create an AWS account](https://portal.aws.amazon.com/gp/aws/developer/registration/index.html) 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](https://docs.aws.amazon.com/cli/latest/userguide/install-cliv2.html) installed and configured
- [Git Installed](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
- [AWS CDK](https://docs.aws.amazon.com/cdk/latest/guide/cli.html) installed and configured

## Deployment Instructions

1. Create a new directory, navigate to that directory in a terminal and clone the GitHub repository:
   ```bash
   git clone https://github.com/aws-samples/serverless-patterns
   ```
2. Change directory to the pattern directory:
   ```bash
   cd serverless-patterns/delayed-eventbridge-events/cdk
   ```
3. Install dependencies:
   ```bash
   npm install
   ```
4. From the command line, configure AWS CDK:
   ```bash
   cdk bootstrap ACCOUNT-NUMBER/REGION # e.g.
   cdk bootstrap 1111111111/us-east-1
   cdk bootstrap --profile test 1111111111/us-east-1
   ```
5. From the command line, use AWS CDK to deploy the AWS resources for the pattern as specified in the `lib/cdk-stack.ts` file:
   ```bash
   npm run build && cdk deploy
   ```

## How it works

We assume we have a business requirement to email a customer 24 hours after they have signed up.

- Consumer listens for `UserCreated` events.
- Lambda processes the `UserCreated` events and then creates a EventBridge Schedule for 24 hours time
- In 24 hours the schedule is triggered with direct integration into EventBridge to trigger a new event
- Downstream consumers listen to the new event and email the customer, or process business requirements

## Cleanup

1. Delete the stack
   ```bash
   cdk destroy
   ```

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