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package terraform
import (
"fmt"
"log"
"github.com/hashicorp/terraform/dag"
)
// StateTransformer is a GraphTransformer that adds the elements of
// the state to the graph.
//
// This transform is used for example by the DestroyPlanGraphBuilder to ensure
// that only resources that are in the state are represented in the graph.
type StateTransformer struct {
Concrete ConcreteResourceNodeFunc
State *State
}
func (t *StateTransformer) Transform(g *Graph) error {
// If the state is nil or empty (nil is empty) then do nothing
if t.State.Empty() {
return nil
}
// Go through all the modules in the diff.
log.Printf("[TRACE] StateTransformer: starting")
var nodes []dag.Vertex
for _, ms := range t.State.Modules {
log.Printf("[TRACE] StateTransformer: Module: %v", ms.Path)
// Go through all the resources in this module.
for name, rs := range ms.Resources {
log.Printf("[TRACE] StateTransformer: Resource %q: %#v", name, rs)
// Add the resource to the graph
addr, err := parseResourceAddressInternal(name)
if err != nil {
panic(fmt.Sprintf(
"Error parsing internal name, this is a bug: %q", name))
}
// Very important: add the module path for this resource to
// the address. Remove "root" from it.
addr.Path = ms.Path[1:]
// Add the resource to the graph
abstract := &NodeAbstractResource{Addr: addr}
var node dag.Vertex = abstract
if f := t.Concrete; f != nil {
node = f(abstract)
}
nodes = append(nodes, node)
}
}
// Add all the nodes to the graph
for _, n := range nodes {
g.Add(n)
}
return nil
}
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