How can a custom event bus from a separate account be incorporated into an event rule located in a different account within the CDK framework?

In account A, I have set up an event rule. In account B, I have a custom event bus that needs to act as the target for the event rule in account A.

I found a helpful guide on Stack Overflow, but it was specific to CloudFormation.

I am providing another account's custom event bus ARN as props.

When running cdk deploy, I encountered an error stating that the resource of undefined length could not be found.

const eventRule = new events.Rule(this, 'event-rule', {
  ruleName: getResourceName(this, 'event-rule', 'rule-name', props.envName),
  description: 'This rule will be used to capture events',
  eventPattern: {"source": ['source']},
})
    
    
eventRule.addTarget(new eventTarget.EventBus(props.anotherAccountEventBusArn))
typescriptamazon-web-servicesaws-cdkaws-event-bridge

Answer №1

When instantiating the event_targets.EventBus constructor, ensure that you provide an argument of type IEventBus, instead of a string.

If you need to create a construct representing a reference to an actual event bus, utilize EventBus.fromEventBusArn. For example, refer to this code snippet from the documentation:

rule.addTarget(new targets.EventBus(
  events.EventBus.fromEventBusArn(
    this,
    'External',
    `arn:aws:events:eu-west-1:999999999999:event-bus/test-bus`,
  ),
));

Keep in mind that your target Event Bus must have a resource policy allowing the source account to input events into it.

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