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package terraform
import (
"github.com/hashicorp/terraform/config"
)
// EvalCountFixZeroOneBoundary 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.
type EvalCountFixZeroOneBoundary struct {
Resource *config.Resource
}
// TODO: test
func (n *EvalCountFixZeroOneBoundary) Eval(ctx EvalContext) (interface{}, error) {
// Get the count, important for knowing whether we're supposed to
// be adding the zero, or trimming it.
count, err := n.Resource.Count()
if err != nil {
return nil, err
}
// Figure what to look for and what to replace it with
hunt := n.Resource.Id()
replace := hunt + ".0"
if count < 2 {
hunt, replace = replace, hunt
}
state, lock := ctx.State()
// Get a lock so we can access this instance and potentially make
// changes to it.
lock.Lock()
defer lock.Unlock()
// Look for the module state. If we don't have one, then it doesn't matter.
mod := state.ModuleByPath(ctx.Path())
if mod == nil {
return nil, nil
}
// Look for the resource state. If we don't have one, then it is okay.
rs, ok := mod.Resources[hunt]
if !ok {
return nil, nil
}
// If the replacement key exists, we just keep both
if _, ok := mod.Resources[replace]; ok {
return nil, nil
}
mod.Resources[replace] = rs
delete(mod.Resources, hunt)
return nil, nil
}
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