From bae9f6d2fd5eb5bc80929bd393932b23f14d7c93 Mon Sep 17 00:00:00 2001 From: Jake Champlin Date: Tue, 6 Jun 2017 12:40:07 -0400 Subject: Initial transfer of provider code --- .../terraform/helper/experiment/experiment.go | 154 +++++++++++++++++++++ .../hashicorp/terraform/helper/experiment/id.go | 34 +++++ 2 files changed, 188 insertions(+) create mode 100644 vendor/github.com/hashicorp/terraform/helper/experiment/experiment.go create mode 100644 vendor/github.com/hashicorp/terraform/helper/experiment/id.go (limited to 'vendor/github.com/hashicorp/terraform/helper/experiment') diff --git a/vendor/github.com/hashicorp/terraform/helper/experiment/experiment.go b/vendor/github.com/hashicorp/terraform/helper/experiment/experiment.go new file mode 100644 index 0000000..18b8837 --- /dev/null +++ b/vendor/github.com/hashicorp/terraform/helper/experiment/experiment.go @@ -0,0 +1,154 @@ +// experiment package contains helper functions for tracking experimental +// features throughout Terraform. +// +// This package should be used for creating, enabling, querying, and deleting +// experimental features. By unifying all of that onto a single interface, +// we can have the Go compiler help us by enforcing every place we touch +// an experimental feature. +// +// To create a new experiment: +// +// 1. Add the experiment to the global vars list below, prefixed with X_ +// +// 2. Add the experiment variable to the All listin the init() function +// +// 3. Use it! +// +// To remove an experiment: +// +// 1. Delete the experiment global var. +// +// 2. Try to compile and fix all the places where the var was referenced. +// +// To use an experiment: +// +// 1. Use Flag() if you want the experiment to be available from the CLI. +// +// 2. Use Enabled() to check whether it is enabled. +// +// As a general user: +// +// 1. The `-Xexperiment-name` flag +// 2. The `TF_X_` env var. +// 3. The `TF_X_FORCE` env var can be set to force an experimental feature +// without human verifications. +// +package experiment + +import ( + "flag" + "fmt" + "os" + "strconv" + "strings" + "sync" +) + +// The experiments that are available are listed below. Any package in +// Terraform defining an experiment should define the experiments below. +// By keeping them all within the experiment package we force a single point +// of definition and use. This allows the compiler to enforce references +// so it becomes easy to remove the features. +var ( + // Shadow graph. This is already on by default. Disabling it will be + // allowed for awhile in order for it to not block operations. + X_shadow = newBasicID("shadow", "SHADOW", false) +) + +// Global variables this package uses because we are a package +// with global state. +var ( + // all is the list of all experiements. Do not modify this. + All []ID + + // enabled keeps track of what flags have been enabled + enabled map[string]bool + enabledLock sync.Mutex + + // Hidden "experiment" that forces all others to be on without verification + x_force = newBasicID("force", "FORCE", false) +) + +func init() { + // The list of all experiments, update this when an experiment is added. + All = []ID{ + X_shadow, + x_force, + } + + // Load + reload() +} + +// reload is used by tests to reload the global state. This is called by +// init publicly. +func reload() { + // Initialize + enabledLock.Lock() + enabled = make(map[string]bool) + enabledLock.Unlock() + + // Set defaults and check env vars + for _, id := range All { + // Get the default value + def := id.Default() + + // If we set it in the env var, default it to true + key := fmt.Sprintf("TF_X_%s", strings.ToUpper(id.Env())) + if v := os.Getenv(key); v != "" { + def = v != "0" + } + + // Set the default + SetEnabled(id, def) + } +} + +// Enabled returns whether an experiment has been enabled or not. +func Enabled(id ID) bool { + enabledLock.Lock() + defer enabledLock.Unlock() + return enabled[id.Flag()] +} + +// SetEnabled sets an experiment to enabled/disabled. Please check with +// the experiment docs for when calling this actually affects the experiment. +func SetEnabled(id ID, v bool) { + enabledLock.Lock() + defer enabledLock.Unlock() + enabled[id.Flag()] = v +} + +// Force returns true if the -Xforce of TF_X_FORCE flag is present, which +// advises users of this package to not verify with the user that they want +// experimental behavior and to just continue with it. +func Force() bool { + return Enabled(x_force) +} + +// Flag configures the given FlagSet with the flags to configure +// all active experiments. +func Flag(fs *flag.FlagSet) { + for _, id := range All { + desc := id.Flag() + key := fmt.Sprintf("X%s", id.Flag()) + fs.Var(&idValue{X: id}, key, desc) + } +} + +// idValue implements flag.Value for setting the enabled/disabled state +// of an experiment from the CLI. +type idValue struct { + X ID +} + +func (v *idValue) IsBoolFlag() bool { return true } +func (v *idValue) String() string { return strconv.FormatBool(Enabled(v.X)) } +func (v *idValue) Set(raw string) error { + b, err := strconv.ParseBool(raw) + if err == nil { + SetEnabled(v.X, b) + } + + return err +} diff --git a/vendor/github.com/hashicorp/terraform/helper/experiment/id.go b/vendor/github.com/hashicorp/terraform/helper/experiment/id.go new file mode 100644 index 0000000..8e2f707 --- /dev/null +++ b/vendor/github.com/hashicorp/terraform/helper/experiment/id.go @@ -0,0 +1,34 @@ +package experiment + +// ID represents an experimental feature. +// +// The global vars defined on this package should be used as ID values. +// This interface is purposely not implement-able outside of this package +// so that we can rely on the Go compiler to enforce all experiment references. +type ID interface { + Env() string + Flag() string + Default() bool + + unexported() // So the ID can't be implemented externally. +} + +// basicID implements ID. +type basicID struct { + EnvValue string + FlagValue string + DefaultValue bool +} + +func newBasicID(flag, env string, def bool) ID { + return &basicID{ + EnvValue: env, + FlagValue: flag, + DefaultValue: def, + } +} + +func (id *basicID) Env() string { return id.EnvValue } +func (id *basicID) Flag() string { return id.FlagValue } +func (id *basicID) Default() bool { return id.DefaultValue } +func (id *basicID) unexported() {} -- cgit v1.2.3