Datasource for datastream static IPs

[melinath]

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Description

As part of setting up a datastream connection with postgres, you have to allowlist the authorized networks. https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/datastream_connection_profile#example-usage---datastream-connection-profile-postgres

The IP addresses in the example are datastream APIs. Instead of requiring users to find these addresses (or use them from the example) it would be great to have a datasource that returns them by calling https://cloud.google.com/datastream/docs/reference/rest/v1/projects.locations/fetchStaticIps.

New or Affected Resource(s)

• datasource google_datastream_static_ips

Potential Terraform Configuration

Compare to Example Usage - Datastream Connection Profile Postgres

# This is pseudocode
datasource "google_datastream_static_ips" "static_ips" {
    location = "us-central1"
}
resource "google_sql_database_instance" "instance" {
    name             = "my-instance"
    database_version = "POSTGRES_14"
    region           = "us-central1"
    settings {
        tier = "db-f1-micro"

        ip_configuration {
            // Datastream IPs will vary by region.
            authorized_networks {
                for_each = datasource.google_datastream_static_ips.static_ips.static_ips
                value = each.value
            }
    }

    deletion_protection  = "true"
}

References

• b/233804820

[rjackson]

I've been working on this. About to raise a PR :)

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