100 lines
4.0 KiB
Go
100 lines
4.0 KiB
Go
package experiments
|
|
|
|
// Experiment represents a particular experiment, which can be activated
|
|
// independently of all other experiments.
|
|
type Experiment string
|
|
|
|
// All active and defunct experiments must be represented by constants whose
|
|
// internal string values are unique.
|
|
//
|
|
// Each of these declared constants must also be registered as either a
|
|
// current or a defunct experiment in the init() function below.
|
|
//
|
|
// Each experiment is represented by a string that must be a valid HCL
|
|
// identifier so that it can be specified in configuration.
|
|
const (
|
|
VariableValidation = Experiment("variable_validation")
|
|
ModuleVariableOptionalAttrs = Experiment("module_variable_optional_attrs")
|
|
SuppressProviderSensitiveAttrs = Experiment("provider_sensitive_attrs")
|
|
ConfigDrivenMove = Experiment("config_driven_move")
|
|
)
|
|
|
|
func init() {
|
|
// Each experiment constant defined above must be registered here as either
|
|
// a current or a concluded experiment.
|
|
registerConcludedExperiment(VariableValidation, "Custom variable validation can now be used by default, without enabling an experiment.")
|
|
registerConcludedExperiment(SuppressProviderSensitiveAttrs, "Provider-defined sensitive attributes are now redacted by default, without enabling an experiment.")
|
|
registerConcludedExperiment(ConfigDrivenMove, "Declarations of moved resource instances using \"moved\" blocks can now be used by default, without enabling an experiment.")
|
|
registerCurrentExperiment(ModuleVariableOptionalAttrs)
|
|
}
|
|
|
|
// GetCurrent takes an experiment name and returns the experiment value
|
|
// representing that expression if and only if it is a current experiment.
|
|
//
|
|
// If the selected experiment is concluded, GetCurrent will return an
|
|
// error of type ConcludedError whose message hopefully includes some guidance
|
|
// for users of the experiment on how to migrate to a stable feature that
|
|
// succeeded it.
|
|
//
|
|
// If the selected experiment is not known at all, GetCurrent will return an
|
|
// error of type UnavailableError.
|
|
func GetCurrent(name string) (Experiment, error) {
|
|
exp := Experiment(name)
|
|
if currentExperiments.Has(exp) {
|
|
return exp, nil
|
|
}
|
|
|
|
if msg, concluded := concludedExperiments[exp]; concluded {
|
|
return Experiment(""), ConcludedError{ExperimentName: name, Message: msg}
|
|
}
|
|
|
|
return Experiment(""), UnavailableError{ExperimentName: name}
|
|
}
|
|
|
|
// Keyword returns the keyword that would be used to activate this experiment
|
|
// in the configuration.
|
|
func (e Experiment) Keyword() string {
|
|
return string(e)
|
|
}
|
|
|
|
// IsCurrent returns true if the receiver is considered a currently-selectable
|
|
// experiment.
|
|
func (e Experiment) IsCurrent() bool {
|
|
return currentExperiments.Has(e)
|
|
}
|
|
|
|
// IsConcluded returns true if the receiver is a concluded experiment.
|
|
func (e Experiment) IsConcluded() bool {
|
|
_, exists := concludedExperiments[e]
|
|
return exists
|
|
}
|
|
|
|
// currentExperiments are those which are available to activate in the current
|
|
// version of Terraform.
|
|
//
|
|
// Members of this set are registered in the init function above.
|
|
var currentExperiments = make(Set)
|
|
|
|
// concludedExperiments are those which were available to activate in an earlier
|
|
// version of Terraform but are no longer available, either because the feature
|
|
// in question has been implemented or because the experiment failed and the
|
|
// feature was abandoned. Each experiment maps to a message describing the
|
|
// outcome, so we can give users feedback about what they might do in modules
|
|
// using concluded experiments.
|
|
//
|
|
// After an experiment has been concluded for a whole major release span it can
|
|
// be removed, since we expect users to perform upgrades one major release at
|
|
// at time without skipping and thus they will see the concludedness error
|
|
// message as they upgrade through a prior major version.
|
|
//
|
|
// Members of this map are registered in the init function above.
|
|
var concludedExperiments = make(map[Experiment]string)
|
|
|
|
func registerCurrentExperiment(exp Experiment) {
|
|
currentExperiments.Add(exp)
|
|
}
|
|
|
|
func registerConcludedExperiment(exp Experiment, message string) {
|
|
concludedExperiments[exp] = message
|
|
}
|