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fix(s3-notifications): lambda destination creates a circular dependency when bucket and lambda are in different stacks #10426

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merged 14 commits into from
Sep 21, 2020

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@iliapolo iliapolo commented Sep 18, 2020

When the bucket and function are in two different stacks, the following stacks are created:

Bucket Stack

  • s3.Bucket
  • s3.BucketNotificationHandler (creates a dependency on lambda stack since it configures the target of the trigger)

Lambda Stack

  • lambda.Function
  • lambda.Permission (creates a dependency on the bucket stack since it configures the lambda to allow invocations from that specific bucket)

The solution is to switch up the lambda.Permission scope and use the bucket instead of the function, so that it is added to the bucket stack, leaving the lambda stack independent.

Fixes #5760


By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

@iliapolo iliapolo requested a review from a team September 18, 2020 14:00
@mergify mergify bot added the contribution/core This is a PR that came from AWS. label Sep 18, 2020
@nija-at nija-at added the pr/do-not-merge This PR should not be merged at this time. label Sep 18, 2020
nija-at
nija-at previously approved these changes Sep 18, 2020
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maybe drop the text "from bucket notification" in the title to make it a little terser.

packages/@aws-cdk/aws-s3-notifications/lib/lambda.ts Outdated Show resolved Hide resolved
@iliapolo iliapolo changed the title fix(s3-notifications): lambda trigger for bucket notification creates circular dependency when bucket and lambda are in different stacks fix(s3-notifications): lambda trigger creates circular dependency when bucket and lambda are in different stacks Sep 18, 2020
@iliapolo iliapolo requested a review from nija-at September 18, 2020 21:11
@iliapolo iliapolo dismissed nija-at’s stale review September 18, 2020 21:12

Significant changes after review

@iliapolo iliapolo requested a review from eladb September 18, 2020 21:14
Co-authored-by: Niranjan Jayakar <nija@amazon.com>
@iliapolo iliapolo changed the title fix(s3-notifications): lambda trigger creates circular dependency when bucket and lambda are in different stacks fix(s3-notifications): lambda destination creates a circular dependency when bucket and lambda are in different stacks Sep 21, 2020
@iliapolo iliapolo removed the pr/do-not-merge This PR should not be merged at this time. label Sep 21, 2020
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mergify bot commented Sep 21, 2020

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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mergify bot commented Sep 21, 2020

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

@mergify mergify bot merged commit 7222b5d into master Sep 21, 2020
@mergify mergify bot deleted the epolon/lambda-bucket-circular-dep branch September 21, 2020 12:30
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  • CodeBuild project: AutoBuildProject6AEA49D1-qxepHUsryhcu
  • Commit ID: 110858c
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S3 LambdaDestination creates a cyclic reference
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