cloudposse / terraform-aws-cloudfront-s3-cdn

Terraform module to easily provision CloudFront CDN backed by an S3 origin
https://cloudposse.com/accelerate
Apache License 2.0
278 stars 247 forks source link

Set allowed and cache methods as non nullable #324

Open travis-reed opened 2 months ago

travis-reed commented 2 months ago

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

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

Gowiem commented 2 months ago

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 commented 2 months ago

/terratest

travis-reed commented 2 months ago

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

Screenshot 2024-09-25 at 11 27 00 PM
travis-reed commented 2 months ago

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

osterman commented 4 weeks ago

@coderabbit full review

coderabbitai[bot] commented 4 weeks ago
:white_check_mark: Actions performed Full review triggered.
coderabbitai[bot] commented 4 weeks ago
📝 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! 🐰✨

📜 Recent review details **Configuration used: CodeRabbit UI** **Review profile: ASSERTIVE**
📥 Commits Reviewing files that changed from the base of the PR and between 86d0a7e3cc1bd445e9fe201d54f4b8fc85fe17dc and 464c680a83052ace091348e006e8b1c07ac7b883.
📒 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 commented 4 weeks ago

@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 commented 4 weeks ago

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coderabbitai[bot] commented 4 weeks ago

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:white_check_mark: Actions performed Full review triggered.
travis-reed commented 4 weeks ago

/terratest