[Bug]: destruction of wafv2 rule group happens in wrong order

[Dominik-Gubrynowicz]

Terraform Core Version

v1.3.6

AWS Provider Version

v4.46.0

Affected Resource(s)

• aws_wafv2_rule_group
• aws_wafv2_web_acl

Expected Behavior

On aws_wafv2_rule_group destroy, there should be different destruction order:

• Remove deleted references to aws_wafv2_rule_group in aws_wafv2_web_acl
• Remove aws_wafv2_rule_group itself

Actual Behavior

Currently, destruction order is following:

• Remove aws_wafv2_rule_group itself
• Remove deleted references to aws_wafv2_rule_group in aws_wafv2_web_acl

Relevant Error/Panic Output Snippet

╷
│ Error: Error deleting WAFv2 RuleGroup: WAFAssociatedItemException: AWS WAF couldn’t perform the operation because your resource is being used by another resource or it’s associated with another resource.
│ 
│ 
╵

Terraform Configuration Files

https://github.com/Dominik-Gubrynowicz/terraform-aws-wafv2-rulegroup-destruction-error/tree/master

Steps to Reproduce

Link attached above directs to the repo that have two branches:

• master (contains ACL with 2 rule_groups attached)
• feat/remove-rule-group (contains ACL with 1 rule group attached, and the second one is commented)

How to reproduce this bug:

• Run terraform apply on master branch
• Run terraform apply on feat/remove-rule-group (and wait few minutes to get an error)

Debug Output

No response

Panic Output

No response

Important Factoids

No response

References

No response

Would you like to implement a fix?

None

[github-actions]

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[jaumebalust]

As a work around I had to delete the whole waf_web_acl_association and the waf_web_acl, and then I could delete the rule_group

[justinretzolk]

Hey all 👋 Thank you for taking the time to raise this! Terraform itself is responsible for generating the graph that determines order of operations, and doesn't currently have a way for providers to supply additional information regarding ordering. That said, you can control this to some degree with create_before_destroy (this issue in the Terraform Core repository has quite a bit more information that I found helpful when brushing up on this particular pattern).

Can someone who has run into this test using the meta-argument to see if that corrects the issue?

[Dominik-Gubrynowicz]

Hello, thank you for your suggestion – I have tested this solution, and it seems it works when you're just removing rule group from configuration, however most of the pain is a rule group modification. When you include create_before_destroy to your lifecycle config and try to modify rule-group with parameters which modification require resource replacement (i.e capacity), then instead of successful apply you'll get because WAF doesn't accept duplicate resources:

╷
│ Error: creating WAFv2 RuleGroup (example-rule1): WAFDuplicateItemException: AWS WAF couldn’t perform the operation because some resource in your request is a duplicate of an existing one.
│ 
│   with aws_wafv2_rule_group.example_rule_group1,
│   on main.tf line 1, in resource "aws_wafv2_rule_group" "example_rule_group1":
│    1: resource "aws_wafv2_rule_group" "example_rule_group1" {
│ 

[justinretzolk]

Thanks for getting back to me @Dominik-Gubrynowicz! I'm thinking this is something that we're going to need upstream Terraform changes for.

Relates hashicorp/terraform#31309