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eval_output.go
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eval_output.go
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package terraform
import (
"fmt"
"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
Value *config.RawConfig
}
// TODO: test
func (n *EvalWriteOutput) Eval(ctx EvalContext) (interface{}, error) {
cfg, err := ctx.Interpolate(n.Value, nil)
if err != nil {
// Ignore it
}
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
}
}
// If it is a list of values, get the first one
if list, ok := valueRaw.([]interface{}); ok {
valueRaw = list[0]
}
if _, ok := valueRaw.(string); !ok {
return nil, fmt.Errorf("output %s is not a string", n.Name)
}
// Write the output
mod.Outputs[n.Name] = valueRaw.(string)
return nil, nil
}