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@mitchellh @apparentlymart
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package terraform
import (
"log"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/dag"
"github.com/hashicorp/terraform/states"
)
// OrphanResourceCountTransformer is a GraphTransformer that adds orphans
// for an expanded count to the graph. The determination of this depends
// on the count argument given.
//
// Orphans are found by comparing the count to what is found in the state.
// This transform assumes that if an element in the state is within the count
// bounds given, that it is not an orphan.
type OrphanResourceCountTransformer struct {
Concrete ConcreteResourceInstanceNodeFunc
Count int // Actual count of the resource, or -1 if count is not set at all
Addr addrs.AbsResource // Addr of the resource to look for orphans
State *states.State // Full global state
}
func (t *OrphanResourceCountTransformer) Transform(g *Graph) error {
rs := t.State.Resource(t.Addr)
if rs == nil {
return nil // Resource doesn't exist in state, so nothing to do!
}
haveKeys := make(map[addrs.InstanceKey]struct{})
for key := range rs.Instances {
haveKeys[key] = struct{}{}
}
if t.Count < 0 {
return t.transformNoCount(haveKeys, g)
}
if t.Count == 0 {
return t.transformZeroCount(haveKeys, g)
}
return t.transformCount(haveKeys, g)
}
func (t *OrphanResourceCountTransformer) transformCount(haveKeys map[addrs.InstanceKey]struct{}, g *Graph) error {
// Due to the logic in Transform, we only get in here if our count is
// at least one.
_, have0Key := haveKeys[addrs.IntKey(0)]
for key := range haveKeys {
if key == addrs.NoKey && !have0Key {
// If we have no 0-key then we will accept a no-key instance
// as an alias for it.
continue
}
i, isInt := key.(addrs.IntKey)
if isInt && int(i) < t.Count {
continue
}
abstract := NewNodeAbstractResourceInstance(t.Addr.Instance(key))
var node dag.Vertex = abstract
if f := t.Concrete; f != nil {
node = f(abstract)
}
log.Printf("[TRACE] OrphanResourceCount(non-zero): adding %s as %T", t.Addr, node)
g.Add(node)
}
return nil
}
func (t *OrphanResourceCountTransformer) transformZeroCount(haveKeys map[addrs.InstanceKey]struct{}, g *Graph) error {
// This case is easy: we need to orphan any keys we have at all.
for key := range haveKeys {
abstract := NewNodeAbstractResourceInstance(t.Addr.Instance(key))
var node dag.Vertex = abstract
if f := t.Concrete; f != nil {
node = f(abstract)
}
log.Printf("[TRACE] OrphanResourceCount(zero): adding %s as %T", t.Addr, node)
g.Add(node)
}
return nil
}
func (t *OrphanResourceCountTransformer) transformNoCount(haveKeys map[addrs.InstanceKey]struct{}, g *Graph) error {
// Negative count indicates that count is not set at all, in which
// case we expect to have a single instance with no key set at all.
// However, we'll also accept an instance with key 0 set as an alias
// for it, in case the user has just deleted the "count" argument and
// so wants to keep the first instance in the set.
_, haveNoKey := haveKeys[addrs.NoKey]
_, have0Key := haveKeys[addrs.IntKey(0)]
keepKey := addrs.NoKey
if have0Key && !haveNoKey {
// If we don't have a no-key instance then we can use the 0-key instance
// instead.
keepKey = addrs.IntKey(0)
}
for key := range haveKeys {
if key == keepKey {
continue
}
abstract := NewNodeAbstractResourceInstance(t.Addr.Instance(key))
var node dag.Vertex = abstract
if f := t.Concrete; f != nil {
node = f(abstract)
}
log.Printf("[TRACE] OrphanResourceCount(no-count): adding %s as %T", t.Addr, node)
g.Add(node)
}
return nil
}
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