add read-only fields updateTime or version to cloudfunctions_function / cloudfunctions2_function

[StephenWithPH]

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Description

GCP's api exposes the version and update time of a cloud function. Exposing either of these fields on the cloudfunctions_function Terraform resource (as a read-only attribute) would be useful for several reasons.

My use case would be to consume the version or update time field as an argument to replace_triggered_by on a Terraform resource that needs to be (re)created when the Cloud Function changes. In my case, the cloudfunctions_function resource is created inside a Terraform module, and other resources not part of that module cannot reference the entire resource in their meta-arguments. cloudfunctions_function does not currently expose any attributes which change when the function's source code changes. Adding the version or update time field would work around this.

New or Affected Resource(s)

• google_cloudfunctions_function
• google_cloudfunctions2_function

Potential Terraform Configuration

# lifted from the current docs
resource "google_cloudfunctions_function" "function" {
  name        = "function-test"
  description = "My function"
  runtime     = "nodejs16"

  available_memory_mb   = 128
  source_archive_bucket = google_storage_bucket.bucket.name
  source_archive_object = google_storage_bucket_object.archive.name
  trigger_http          = true
  entry_point           = "helloGET"
}

# demonstrating the requested new field via an output
output "function_version" {
  value = google_cloudfunctions_function.function.version_id
}

# demonstrating the requested new field via an output
output "function_update_time" {
  value = google_cloudfunctions_function.function.update_time
}

References

• see the versionId and updateTime fields on the api's CloudFunction resource here: https://cloud.google.com/functions/docs/reference/rest/v1/projects.locations.functions?hl=en_US#CloudFunction
• see the updateTime field on the v2 beta api's Function resource here: https://cloud.google.com/functions/docs/reference/rest/v2beta/projects.locations.functions?hl=en_US#Function
• google_cloudfunctions_function_iam_member not recreated when referenced cloud_function is destroyed and recreated #11650 - an issue I opened (and closed) where Terraform's replace_triggered_by lifecycle meta-argument can sometimes be used as a very blunt hammer to effect useful behavior

Anything Else

It looks like updateTime is available on both the v1 and v2 (beta) resources, while versionId is only on the v1 resource. This suggests that updateTime might be a more future-proof choice.

b/274817399