Set allowed and cache methods as non nullable

[travis-reed]

what

Set allowed_methods and cached_methods as non nullable

Setting nullable to false ensures that the variable value will never be null within the module. If nullable is false and the variable has a default value, then Terraform uses the default when a module input argument is null.

why

I want to be able to sometimes call this module with explicit allowed_methods and cached_methods and sometimes just use the module defaults.

As it stands, I cannot do that without making my default value match your default value. It would be better for the module to use its defaults when I pass in null

Right now I am hitting

Error: Missing required argument

  with module.fanx.module.sdp_assets.module.static_cdn.aws_cloudfront_distribution.default[0],
  on /tmp/terraform-data-dir/modules/fanx.sdp_assets.static_cdn/main.tf line 522, in resource "aws_cloudfront_distribution" "default":
 522:     allowed_methods            = var.allowed_methods

The argument "default_cache_behavior.0.allowed_methods" is required, but no
definition was found.

Which I can work around by setting a default on my side, but it isn't ideal behavior

references

• https://developer.hashicorp.com/terraform/language/values/variables#disallowing-null-input-values
• https://stackoverflow.com/questions/72213875/transformer-how-to-call-a-module-with-variables-as-default-value

Additional Notes

I wouldn't consider this a breaking change. Today, the behavior if you pass in null as the argument to the module you will get a failure as shown above. This makes passing in null possible without negatively impacting existing users.

Summary by CodeRabbit

• Bug Fixes
  • Enhanced validation for allowed_methods and cached_methods by ensuring they cannot be set to null, improving overall data integrity.

[Gowiem]

Huh this is interesting @travis-reed -- the first use-case of 'nullable' I've seen. Thanks for providing the explanation!

What version of TF was this introduced? We may need to update our pinning of TF for this module to support this usage depending on when it was added to the language.

[Gowiem]

/terratest

[travis-reed]

Huh this is interesting @travis-reed -- the first use-case of 'nullable' I've seen. Thanks for providing the explanation!

What version of TF was this introduced? We may need to update our pinning of TF for this module to support this usage depending on when it was added to the language.

Thanks for taking a look @Gowiem,

This feature was introduced in terraform 1.1

It looks like this module is requiring >= terraform 1.3 so I would expect this to work without upgrading the required version on the module

[travis-reed]

I see that the bats action failed, but it seems like that may be failing on older merged prs too.

[osterman]

@CodeRabbit full review

[coderabbitai]

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[coderabbitai]

📝 Walkthrough

📝 Walkthrough

Walkthrough

The changes involve updates to the variables.tf file, specifically adding the nullable attribute to the variable declarations for allowed_methods and cached_methods. Both variables are now set to nullable = false, ensuring they cannot be null. This modification enhances the validation of these variables while keeping the rest of the declarations unchanged.

Changes

File	Change Summary
variables.tf	Updated allowed_methods and cached_methods to include nullable = false

Poem

In the land of code where bunnies hop,
Variables now can't take a drop.
Allowed_methods and cached stand tall,
With nullable = false, they won't fall!
Hooray for the changes, let's give a cheer,
For values that matter, we hold dear! 🐰✨

---

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Review profile: ASSERTIVE

📥 Commits

Reviewing files that changed from the base of the PR and between 86d0a7e and 464c680.

📒 Files selected for processing (1)

• variables.tf (1 hunks)

🔇 Additional comments (2)

variables.tf (2)

217-220: LGTM! Setting allowed_methods as non-nullable with default value is safe.

The change ensures that the variable will never be null while maintaining backward compatibility through the default value.

---

224-227: LGTM! Setting cached_methods as non-nullable maintains consistency with allowed_methods.

The change is safe as it has a sensible default value. Note that cached_methods must be a subset of allowed_methods, and the default values maintain this relationship (["GET", "HEAD"] is a subset of ["DELETE", "GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT"]).

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[osterman]

@travis-reed the bats error is:

Cloud Posse requires all providers to use registry format introduced in Terraform 0.13, for example
    aws = {
       source  = "hashicorp/aws"
       version = ">= 3.0"
    }

Please add constraints for these providers:
  - local

[osterman]

@CodeRabbit full review

[coderabbitai]

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Full review triggered.

[travis-reed]

/terratest