forked from hashicorp/terraform
/
eval_local.go
86 lines (70 loc) · 1.83 KB
/
eval_local.go
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package terraform
import (
"fmt"
"github.com/hashicorp/terraform/config"
)
// EvalLocal is an EvalNode implementation that evaluates the
// expression for a local value and writes it into a transient part of
// the state.
type EvalLocal struct {
Name string
Value *config.RawConfig
}
func (n *EvalLocal) Eval(ctx EvalContext) (interface{}, error) {
cfg, err := ctx.Interpolate(n.Value, nil)
if err != nil {
return nil, fmt.Errorf("local.%s: %s", n.Name, err)
}
state, lock := ctx.State()
if state == nil {
return nil, fmt.Errorf("cannot write local value to nil state")
}
// Get a write lock so we can access the state
lock.Lock()
defer lock.Unlock()
// Look for the module state. If we don't have one, create it.
mod := state.ModuleByPath(ctx.Path())
if mod == nil {
mod = state.AddModule(ctx.Path())
}
// Get the value from the config
var valueRaw interface{} = config.UnknownVariableValue
if cfg != nil {
var ok bool
valueRaw, ok = cfg.Get("value")
if !ok {
valueRaw = ""
}
if cfg.IsComputed("value") {
valueRaw = config.UnknownVariableValue
}
}
if mod.Locals == nil {
// initialize
mod.Locals = map[string]interface{}{}
}
mod.Locals[n.Name] = valueRaw
return nil, nil
}
// EvalDeleteLocal is an EvalNode implementation that deletes a Local value
// from the state. Locals aren't persisted, but we don't need to evaluate them
// during destroy.
type EvalDeleteLocal struct {
Name string
}
func (n *EvalDeleteLocal) Eval(ctx EvalContext) (interface{}, error) {
state, lock := ctx.State()
if state == nil {
return nil, nil
}
// Get a write lock so we can access this instance
lock.Lock()
defer lock.Unlock()
// Look for the module state. If we don't have one, create it.
mod := state.ModuleByPath(ctx.Path())
if mod == nil {
return nil, nil
}
delete(mod.Locals, n.Name)
return nil, nil
}