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eval_output.go
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eval_output.go
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package terraform
import (
"fmt"
"log"
"github.com/hashicorp/terraform/config"
)
// EvalDeleteOutput is an EvalNode implementation that deletes an output
// from the state.
type EvalDeleteOutput struct {
Name string
}
// TODO: test
func (n *EvalDeleteOutput) 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.Outputs, n.Name)
return nil, nil
}
// EvalWriteOutput is an EvalNode implementation that writes the output
// for the given name to the current state.
type EvalWriteOutput struct {
Name string
Sensitive bool
Value *config.RawConfig
}
// TODO: test
func (n *EvalWriteOutput) Eval(ctx EvalContext) (interface{}, error) {
cfg, err := ctx.Interpolate(n.Value, nil)
if err != nil {
// Log error but continue anyway
log.Printf("[WARN] Output interpolation %q failed: %s", n.Name, err)
}
state, lock := ctx.State()
if state == nil {
return nil, fmt.Errorf("cannot write state to nil state")
}
// 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 {
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
}
}
switch valueTyped := valueRaw.(type) {
case string:
mod.Outputs[n.Name] = &OutputState{
Type: "string",
Sensitive: n.Sensitive,
Value: valueTyped,
}
case []interface{}:
mod.Outputs[n.Name] = &OutputState{
Type: "list",
Sensitive: n.Sensitive,
Value: valueTyped,
}
case map[string]interface{}:
mod.Outputs[n.Name] = &OutputState{
Type: "map",
Sensitive: n.Sensitive,
Value: valueTyped,
}
case []map[string]interface{}:
// an HCL map is multi-valued, so if this was read out of a config the
// map may still be in a slice.
if len(valueTyped) == 1 {
mod.Outputs[n.Name] = &OutputState{
Type: "map",
Sensitive: n.Sensitive,
Value: valueTyped[0],
}
break
}
return nil, fmt.Errorf("output %s type (%T) with %d values not valid for type map",
n.Name, valueTyped, len(valueTyped))
default:
return nil, fmt.Errorf("output %s is not a valid type (%T)\n", n.Name, valueTyped)
}
return nil, nil
}