foo.go

func (c *Reconciler) reconcileFoo(parent *Parent) error {
  // Get the current state of the Foo
  foo, getFooErr := c.fooLister.Foos(ns).Get(name)
  if apierrs.IsNotFound(getFooErr) {
    // If it doesn’t exist, create it.
    foo, err = c.createFoo(parent)
    if err != nil {
      return err
    }
  } else if getFooErr != nil {
    return getFooErr
  }

  // If it does exist, make sure it matches our desired state.
  if desired := resources.MakeFoo(parent); desired != foo {
    foo, err = c.updateFoo(parent, desired)
    if err != nil {
      return err
    }
  }

  // Lastly, reflect the status of the Foo in our own.
  parent.Status.PropagateFooStatus(foo)
  return nil
}