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package terraform
import (
"log"
)
// EvalCountFixZeroOneBoundaryGlobal is an EvalNode that fixes up the state
// when there is a resource count with zero/one boundary, i.e. fixing
// a resource named "aws_instance.foo" to "aws_instance.foo.0" and vice-versa.
//
// This works on the global state.
type EvalCountFixZeroOneBoundaryGlobal struct{}
// TODO: test
func (n *EvalCountFixZeroOneBoundaryGlobal) Eval(ctx EvalContext) (interface{}, error) {
// Get the state and lock it since we'll potentially modify it
state, lock := ctx.State()
lock.Lock()
defer lock.Unlock()
// Prune the state since we require a clean state to work
state.prune()
// Go through each modules since the boundaries are restricted to a
// module scope.
for _, m := range state.Modules {
if err := n.fixModule(m); err != nil {
return nil, err
}
}
return nil, nil
}
func (n *EvalCountFixZeroOneBoundaryGlobal) fixModule(m *ModuleState) error {
// Counts keeps track of keys and their counts
counts := make(map[string]int)
for k, _ := range m.Resources {
// Parse the key
key, err := ParseResourceStateKey(k)
if err != nil {
return err
}
// Set the index to -1 so that we can keep count
key.Index = -1
// Increment
counts[key.String()]++
}
// Go through the counts and do the fixup for each resource
for raw, count := range counts {
// Search and replace this resource
search := raw
replace := raw + ".0"
if count < 2 {
search, replace = replace, search
}
log.Printf("[TRACE] EvalCountFixZeroOneBoundaryGlobal: count %d, search %q, replace %q", count, search, replace)
// Look for the resource state. If we don't have one, then it is okay.
rs, ok := m.Resources[search]
if !ok {
continue
}
// If the replacement key exists, we just keep both
if _, ok := m.Resources[replace]; ok {
continue
}
m.Resources[replace] = rs
delete(m.Resources, search)
}
return nil
}
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