data google_compute_addresses with filter

[stephenc]

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Description

In order to configure a kubernetes cluster with allowed networks, I need to know the status:IN_USE addresses of purpose:NAT_AUTO

the google_compute_address data source only fetches a single named address, but as these are AUTO_IP and created in a separate project, I cannot find them as I cannot predict what names they will have

New or Affected Resource(s)

• google_compute_addresses

Potential Terraform Configuration

# The use case is where the project you want to query the addresses from is either
# managed by another team with their own separate terraform state or
# not managed by terraform :-(
# We assume that the user running terraform has read permissions for the network 
# addresses in the project they need to query... or they are impersonating a
# service account that has read permissions
#
# resolved value is a list of objects with the same format as "google_compute_address"
data "google_compute_addresses" "vpn-nat-addresses" {
  project = "the-project-that-has-the-vpn"
  filter = "purpose:'NAT_AUTO' AND status:'IN_USE'"
}

...

resource "google_container_cluster" "my-cluster" {
  ...
  master_authorized_networks_config {
    dynamic "cidr_blocks" {
      for_each = data.google_compute_addresses.vpn-nat-addresses
      content {
        cidr_block = "${cidr_blocks.value.address}/32"
      }
    }    
  }
  ...
}

References

• gcloud compute addresses list --project ... -- filter ... returns the information required but gets ugly to wire up with an external provider if using service account impersonation

[rileykarson]

See #8255, this is blocked on that.

[melinath]

b/243811404

[github-actions]

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