opentofu/internal/terraform/transform_attach_state.go
Martin Atkins 36d0a50427 Move terraform/ to internal/terraform/
This is part of a general effort to move all of Terraform's non-library
package surface under internal in order to reinforce that these are for
internal use within Terraform only.

If you were previously importing packages under this prefix into an
external codebase, you could pin to an earlier release tag as an interim
solution until you've make a plan to achieve the same functionality some
other way.
2021-05-17 14:09:07 -07:00

69 lines
2.1 KiB
Go

package terraform
import (
"log"
"github.com/hashicorp/terraform/internal/dag"
"github.com/hashicorp/terraform/internal/states"
)
// GraphNodeAttachResourceState is an interface that can be implemented
// to request that a ResourceState is attached to the node.
//
// Due to a historical naming inconsistency, the type ResourceState actually
// represents the state for a particular _instance_, while InstanceState
// represents the values for that instance during a particular phase
// (e.g. primary vs. deposed). Consequently, GraphNodeAttachResourceState
// is supported only for nodes that represent resource instances, even though
// the name might suggest it is for containing resources.
type GraphNodeAttachResourceState interface {
GraphNodeResourceInstance
// Sets the state
AttachResourceState(*states.Resource)
}
// AttachStateTransformer goes through the graph and attaches
// state to nodes that implement the interfaces above.
type AttachStateTransformer struct {
State *states.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 node states: overall state is nil")
return nil
}
for _, v := range g.Vertices() {
// Nodes implement this interface to request state attachment.
an, ok := v.(GraphNodeAttachResourceState)
if !ok {
continue
}
addr := an.ResourceInstanceAddr()
rs := t.State.Resource(addr.ContainingResource())
if rs == nil {
log.Printf("[DEBUG] Resource state not found for node %q, instance %s", dag.VertexName(v), addr)
continue
}
is := rs.Instance(addr.Resource.Key)
if is == nil {
// We don't actually need this here, since we'll attach the whole
// resource state, but we still check because it'd be weird
// for the specific instance we're attaching to not to exist.
log.Printf("[DEBUG] Resource instance state not found for node %q, instance %s", dag.VertexName(v), addr)
continue
}
// make sure to attach a copy of the state, so instances can modify the
// same ResourceState.
an.AttachResourceState(rs.DeepCopy())
}
return nil
}