func (m schemaMap) diffSet(
k string,
schema *Schema,
diff *terraform.InstanceDiff,
d *ResourceData,
all bool) error {
if !all {
// This is a bit strange, but we expect the entire set to be in the diff,
// so we first diff the set normally but with a new diff. Then, if
// there IS any change, we just set the change to the entire list.
tempD := new(terraform.InstanceDiff)
tempD.Attributes = make(map[string]*terraform.ResourceAttrDiff)
if err := m.diffList(k, schema, tempD, d, false); err != nil {
return err
}
// If we had no changes, then we're done
if tempD.Empty() {
return nil
}
}
// We have changes, so re-run the diff, but set a flag to force
// getting all diffs, even if there is no change.
return m.diffList(k, schema, diff, d, true)
}
// Diff returns the diff for a resource given the schema map,
// state, and configuration.
func (m schemaMap) Diff(
s *terraform.InstanceState,
c *terraform.ResourceConfig) (*terraform.InstanceDiff, error) {
result := new(terraform.InstanceDiff)
result.Attributes = make(map[string]*terraform.ResourceAttrDiff)
d := &ResourceData{
schema: m,
state: s,
config: c,
}
for k, schema := range m {
err := m.diff(k, schema, result, d, false)
if err != nil {
return nil, err
}
}
// If the diff requires a new resource, then we recompute the diff
// so we have the complete new resource diff, and preserve the
// RequiresNew fields where necessary so the user knows exactly what
// caused that.
if result.RequiresNew() {
// Create the new diff
result2 := new(terraform.InstanceDiff)
result2.Attributes = make(map[string]*terraform.ResourceAttrDiff)
// Reset the data to not contain state. We have to call init()
// again in order to reset the FieldReaders.
d.state = nil
d.init()
// Perform the diff again
for k, schema := range m {
err := m.diff(k, schema, result2, d, false)
if err != nil {
return nil, err
}
}
// Force all the fields to not force a new since we know what we
// want to force new.
for k, attr := range result2.Attributes {
if attr == nil {
continue
}
if attr.RequiresNew {
attr.RequiresNew = false
}
if s != nil {
attr.Old = s.Attributes[k]
}
}
// Now copy in all the requires new diffs...
for k, attr := range result.Attributes {
if attr == nil {
continue
}
newAttr, ok := result2.Attributes[k]
if !ok {
newAttr = attr
}
if attr.RequiresNew {
newAttr.RequiresNew = true
}
result2.Attributes[k] = newAttr
}
// And set the diff!
result = result2
}
// Remove any nil diffs just to keep things clean
for k, v := range result.Attributes {
if v == nil {
delete(result.Attributes, k)
}
}
// Go through and detect all of the ComputedWhens now that we've
// finished the diff.
// TODO
if result.Empty() {
// If we don't have any diff elements, just return nil
return nil, nil
}
return result, nil
}