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package terraform
import (
"log"
"github.com/hashicorp/terraform/dag"
)
// GraphNodeAttachResourceState is an interface that can be implemented
// to request that a ResourceState is attached to the node.
type GraphNodeAttachResourceState interface {
// The address to the resource for the state
ResourceAddr() *ResourceAddress
// Sets the state
AttachResourceState(*ResourceState)
}
// AttachStateTransformer goes through the graph and attaches
// state to nodes that implement the interfaces above.
type AttachStateTransformer struct {
State *State // State is the root state
}
func (t *AttachStateTransformer) Transform(g *Graph) error {
// If no state, then nothing to do
if t.State == nil {
log.Printf("[DEBUG] Not attaching any state: state is nil")
return nil
}
filter := &StateFilter{State: t.State}
for _, v := range g.Vertices() {
// Only care about nodes requesting we're adding state
an, ok := v.(GraphNodeAttachResourceState)
if !ok {
continue
}
addr := an.ResourceAddr()
// Get the module state
results, err := filter.Filter(addr.String())
if err != nil {
return err
}
// Attach the first resource state we get
found := false
for _, result := range results {
if rs, ok := result.Value.(*ResourceState); ok {
log.Printf(
"[DEBUG] Attaching resource state to %q: %#v",
dag.VertexName(v), rs)
an.AttachResourceState(rs)
found = true
break
}
}
if !found {
log.Printf(
"[DEBUG] Resource state not found for %q: %s",
dag.VertexName(v), addr)
}
}
return nil
}
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