6 "github.com/hashicorp/terraform/states"
9 // StateTransformer is a GraphTransformer that adds the elements of
10 // the state to the graph.
12 // This transform is used for example by the DestroyPlanGraphBuilder to ensure
13 // that only resources that are in the state are represented in the graph.
14 type StateTransformer struct {
15 // ConcreteCurrent and ConcreteDeposed are used to specialize the abstract
16 // resource instance nodes that this transformer will create.
18 // If either of these is nil, the objects of that type will be skipped and
19 // not added to the graph at all. It doesn't make sense to use this
20 // transformer without setting at least one of these, since that would
21 // skip everything and thus be a no-op.
22 ConcreteCurrent ConcreteResourceInstanceNodeFunc
23 ConcreteDeposed ConcreteResourceInstanceDeposedNodeFunc
28 func (t *StateTransformer) Transform(g *Graph) error {
29 if !t.State.HasResources() {
30 log.Printf("[TRACE] StateTransformer: state is empty, so nothing to do")
35 case t.ConcreteCurrent != nil && t.ConcreteDeposed != nil:
36 log.Printf("[TRACE] StateTransformer: creating nodes for both current and deposed instance objects")
37 case t.ConcreteCurrent != nil:
38 log.Printf("[TRACE] StateTransformer: creating nodes for current instance objects only")
39 case t.ConcreteDeposed != nil:
40 log.Printf("[TRACE] StateTransformer: creating nodes for deposed instance objects only")
42 log.Printf("[TRACE] StateTransformer: pointless no-op call, creating no nodes at all")
45 for _, ms := range t.State.Modules {
48 for _, rs := range ms.Resources {
49 resourceAddr := rs.Addr.Absolute(moduleAddr)
51 for key, is := range rs.Instances {
52 addr := resourceAddr.Instance(key)
54 if obj := is.Current; obj != nil && t.ConcreteCurrent != nil {
55 abstract := NewNodeAbstractResourceInstance(addr)
56 node := t.ConcreteCurrent(abstract)
58 log.Printf("[TRACE] StateTransformer: added %T for %s current object", node, addr)
61 if t.ConcreteDeposed != nil {
62 for dk := range is.Deposed {
63 abstract := NewNodeAbstractResourceInstance(addr)
64 node := t.ConcreteDeposed(abstract, dk)
66 log.Printf("[TRACE] StateTransformer: added %T for %s deposed object %s", node, addr, dk)