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