feat(events-targets): add toggle to opt out of resource policy creation for targeted log group by gwaltneyluke · Pull Request #32242 · aws/aws-cdk

gwaltneyluke · 2024-11-22T00:31:37Z

Issue # (if applicable)

Reason for this change

When a CloudWatch LogGroup is set as the target of an EventBridge rule, a custom resource creates a Log Resource Policy to establish trust so that EventBridge can write messages to CloudWatch. However, there is a strict limit of 10 CloudWatch Log Resource Policies per account per region. This therefore limits the amount of EventBridge rules an account can have writing to CloudWatch.

Description of changes

The optional property createLogGroupResourcePolicy has been added to the LogGroupProps interface. When omitted or set to true, the Resource Policy is created just as the functionality exists today. When set to false, the Resource Policy is not created. The trust between EventBridge and CloudWatch must be established manually.

Description of how you validated changes

Unit tests have been added and are passing. Existing integration tests are passing.

Code was also linked to an existing project, where the new property was toggled on and off. When on, the CloudWatch LogGroup Resource Policy was created, and messages sent to EventBridge were making it to the LogGroup. When off, the CloudWatch LogGroup Resource Policy was NOT created, but a custom Resource Policy still allowed messages sent to the EventBridge to end up in the LogGroup.

Checklist

My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

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aws-cdk-automation · 2025-02-02T00:12:41Z

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aws-cdk-automation · 2025-02-10T00:12:00Z

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github-actions · 2025-02-10T00:12:15Z

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aaythapa

Thanks for contributing! Changes look good, just a couple nits and a question. I see there are some merge conflicts as well.

aaythapa · 2025-02-10T18:46:10Z

packages/aws-cdk-lib/aws-events-targets/README.md

-to set `installLatestAwsSdk` to `true`. This may be problematic for CN partition deployment. To
-workaround this issue, set `installLatestAwsSdk` to `false`.
+By default, the CloudWatch LogGroup target will create a LogGroup Resource Policy which allows
+EventBridge to write to the target LogGroup. If you want to manage this trust relationship manually,


How is the trust relationship managed manually? Is there a way we can make it easier through a property? If there is then we should go with that and my thinking is if they set that property then we don't make a resource policy. So the property will not only opt users out of making resource policies but make it easier to manage the trust. What are your thoughts on this?

I was thinking the trust relationship would be managed with a pre-existing Log Group Resource Policy that allows EventBridge to write to any log group with a specific prefix (ex: /aws/events/). This way we can have several rules write to different log groups and that trust is managed by a single policy. This might be a little too coarse a policy, though.

Another idea would be to provide an existing Log Group Resource Policy to this method, and the method can add a statement to that policy which allows EventBridge to write to the specified log group, rather than adding a whole new policy.

packages/aws-cdk-lib/aws-events-targets/README.md

packages/aws-cdk-lib/aws-events-targets/lib/log-group.ts

aws-cdk-automation · 2025-02-12T00:11:19Z

This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

aws-cdk-automation · 2025-02-13T00:11:11Z

This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

aws-cdk-automation · 2025-02-14T21:15:57Z

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Abogical

Hi @gwaltneyluke ! Thank you for your contribution.

This looks good, but there are currently conflicts with the main branch with the snapshot files. Try rebasing from main and regenerating the snapshots to fix the conflicts.

github-actions · 2025-10-27T12:10:16Z

This PR has not received a response in a while. If you want to keep this issue open, please leave a comment below and auto-close will be canceled.

Luke Gwaltney added 2 commits November 21, 2024 17:44

feat: add flag to opt out of log group resource policy

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docs: remove trailing space

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github-actions bot added effort/medium Medium work item – several days of effort feature-request A feature should be added or improved. p2 labels Nov 22, 2024

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test: add target without log resource policy to integration test and …

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gwaltneyluke added 2 commits November 21, 2024 20:52

Merge branch 'main' into create-logs-resource-policy

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test: integration tests fix

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gwaltneyluke added 2 commits November 22, 2024 15:06

Merge branch 'main' into create-logs-resource-policy

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Merge branch 'main' into create-logs-resource-policy

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gwaltneyluke added 2 commits February 14, 2025 15:27

Merge branch 'main' into create-logs-resource-policy

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refactor: comment boolean default, simplify default behavior

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gwaltneyluke commented Nov 22, 2024

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