Steps for setting up an event notification for an imported Bucket

My current project involves writing the script in cdk using typescript.

I'm trying to use an existing bucket as a trigger for my lambda function.

const _bucket = s3.Bucket.fromBucketName(this,"frombucket",`vr-${targetEnv}-resource-up-bk`);

lambdaFromContainer_.addEventSource(new S3EventSource(_bucket, { 
  events: [ s3.EventType.OBJECT_CREATED],

}));

The issue arises when s3.Bucket.fromBucketName returns IBucket, causing an error with S3EventSource(_bucket

Argument of type 'IBucket' is not assignable to parameter of type 'Bucket'.
  Type 'IBucket' is missing the following properties from type 'Bucket': autoCreatePolicy, lifecycleRules, metrics, cors, and 31 more.ts(2345)

Any ideas on how to resolve this problem?

Interestingly, creating a new Bucket does not result in any errors.

const _bucket = new s3.Bucket(this, 'cdk-out-bk', {
      bucketName: `vr-${targetEnv}-resource-up-bk`,
}
lambdaFromContainer_.addEventSource(new S3EventSource(_bucket, { 
  events: [ s3.EventType.OBJECT_CREATED],

}));
typescriptamazon-web-servicesamazon-s3aws-cdk

Answer №1

The reason for this limitation is that CDK lacks the ability to alter imported resources, hence the restricted properties available on IBucket. To set up notifications for a bucket, it's necessary to create the bucket and configure the notification within the same CDK application.

To delve deeper into this matter, please refer to the inquiry at: Implementing managed policies with CDK

Despite these constraints, custom resources offer flexibility in making modifications. Fortunately, there exists a custom resource specifically designed for adding event notifications to imported buckets. Here’s how you can utilize it:

bucket.addEventNotification(s3.EventType.OBJECT_REMOVED, new s3n.SqsDestination(mySqsQueue));

An illustrative example sourced from the documentation:

https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_s3-readme.html#importing-existing-buckets

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