terraform/terraform/transform_resource_count.go

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2016-11-06 19:15:09 +01:00
package terraform
import (
"fmt"
"github.com/hashicorp/terraform/dag"
)
// ResourceCountTransformer is a GraphTransformer that expands the count
// out for a specific resource.
//
// This assumes that the count is already interpolated.
type ResourceCountTransformer struct {
Concrete ConcreteResourceNodeFunc
Count int
Addr *ResourceAddress
}
func (t *ResourceCountTransformer) Transform(g *Graph) error {
// Don't allow the count to be negative
if t.Count < 0 {
return fmt.Errorf("negative count: %d", t.Count)
}
// For each count, build and add the node
for i := 0; i < t.Count; i++ {
// Set the index. If our count is 1 we special case it so that
// we handle the "resource.0" and "resource" boundary properly.
index := i
if t.Count == 1 {
index = -1
}
// Build the resource address
addr := t.Addr.Copy()
addr.Index = index
// Build the abstract node and the concrete one
abstract := &NodeAbstractResource{Addr: addr}
var node dag.Vertex = abstract
if f := t.Concrete; f != nil {
node = f(abstract)
}
// Add it to the graph
g.Add(node)
}
return nil
}