test.go

func resourceComputeFloatingIPAssociateV2Read(d *schema.ResourceData, meta interface{}) error {
  config := meta.(*Config)
  computeClient, err := config.computeV2Client(GetRegion(d))
  if err != nil {
    return fmt.Errorf("Error creating OpenStack compute client: %s", err)
  }

  // Obtain relevant info from parsing the ID
  floatingIP, instanceId, fixedIP, err := parseComputeFloatingIPAssociateId(d.Id())
  if err != nil {
    return err
  }

  d.Set("floating_ip", floatingIP)
  d.Set("instance_id", instanceId)
  d.Set("fixed_ip", fixedIP)
  d.Set("region", GetRegion(d))

  // check whether floatingIP or associated instance deleted
  allPages, err := floatingips.List(computeClient).AllPages()
  if err != nil {
    return err
  }

  allFips, err := floatingips.ExtractFloatingIPs(allPages)
  if err != nil {
    return err
  }

  var fip floatingips.FloatingIP
  var found bool
  for _, f := range allFips {
    if f.IP == floatingIP {
      fip = f
      found = true
    }
  }

  if !found {
    d.SetId("")
  }

  if fip.InstanceID == "" {
    d.SetId("")
  }
  
  return nil
}