fix(): fix a bug while deleting event policies for channels

[rahulii]

Fixes #

Proposed Changes

• 🐛 Delete the backingChannel Event Policy in case the channel event policy is deleted

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Delete the backingChannel Event Policy in case the channel event policy is deleted

Docs

[knative-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rahulii
Once this PR has been reviewed and has the lgtm label, please assign psschwei for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[rahulii]

/cc: @creydr

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.93%. Comparing base (20a64a1) to head (cfdc012).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8141      +/-   ##
==========================================
+ Coverage   67.89%   67.93%   +0.03%     
==========================================
  Files         368      368              
  Lines       17570    17566       -4     
==========================================
+ Hits        11929    11933       +4     
+ Misses       4893     4886       -7     
+ Partials      748      747       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[creydr]

Hello @rahulii,
I am sorry for the back and forth on this. But as said in Slack, I remembered, that we set the OwnerReference in the backingChannels EventPolicy to the "parent"-channels EventPolicy:

eventing/pkg/reconciler/channel/resources/eventpolicy.go

Lines 46 to 49 in b58b30d

	APIVersion: parentPolicy.GetGroupVersionKind().GroupVersion().String(),
	Kind: parentPolicy.GetGroupVersionKind().Kind,
	Name: parentPolicy.Name,
	UID: parentPolicy.UID,

So we should be fine with deleting the backing channels EP, when the channels EP gets deleted.

But as you said, we should have at least a test for it. So we could have a unit test, which tests, that the owner reference is set correctly (the deletion is a k8s internal part). WDYT about updating your PR to add a test case for this instead?

[rahulii]

Hello @rahulii, I am sorry for the back and forth on this. But as said in Slack, I remembered, that we set the OwnerReference in the backingChannels EventPolicy to the "parent"-channels EventPolicy:

eventing/pkg/reconciler/channel/resources/eventpolicy.go

Lines 46 to 49 in b58b30d

	APIVersion: parentPolicy.GetGroupVersionKind().GroupVersion().String(),
	Kind: parentPolicy.GetGroupVersionKind().Kind,
	Name: parentPolicy.Name,
	UID: parentPolicy.UID,

So we should be fine with deleting the backing channels EP, when the channels EP gets deleted.

But as you said, we should have at least a test for it. So we could have a unit test, which tests, that the owner reference is set correctly (the deletion is a k8s internal part). WDYT about updating your PR to add a test case for this instead?

that makes sense, will update the PR!
will have to add E2E tests in the future for testing the deletions

[rahulii]

Hello @rahulii, I am sorry for the back and forth on this. But as said in Slack, I remembered, that we set the OwnerReference in the backingChannels EventPolicy to the "parent"-channels EventPolicy:

eventing/pkg/reconciler/channel/resources/eventpolicy.go

Lines 46 to 49 in b58b30d

	APIVersion: parentPolicy.GetGroupVersionKind().GroupVersion().String(),
	Kind: parentPolicy.GetGroupVersionKind().Kind,
	Name: parentPolicy.Name,
	UID: parentPolicy.UID,

So we should be fine with deleting the backing channels EP, when the channels EP gets deleted.

But as you said, we should have at least a test for it. So we could have a unit test, which tests, that the owner reference is set correctly (the deletion is a k8s internal part). WDYT about updating your PR to add a test case for this instead?

@creydr so the current changes I made, should I revoke them ? should we keep the code as it was before this PR ? 🤔

[creydr]

I would only add a unit test in this PR

[rahulii]

@creydr if you see a unit test case just above this - https:/knative/eventing/blob/main/pkg/reconciler/channel/channel_test.go#L574
it checks for owner references , so thic test case would be exactly same I believe.
Do you think we should add the exact same TC ?

[creydr]

ok. Then I think we're fine here and can close this PR

[rahulii]

ok. Then I think we're fine here and can close this PR

@creydr I was just thinking, if k8s will automatically clean the policies, what the point of keeping https:/knative/eventing/pull/8141/files#diff-118d54e11363ce17cd0de2c082c234f0dcd47f4d1078f58d1d6b0866a091886bL141-L162 ?
Aren't these un-necessary cycles?

And even though if we are keeping those (let's say a double check), I believe it still has a bug which can be solved.
WDYT?