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features.go
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features.go
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//go:generate stringer -type=FeatureFlag
package features
import (
"expvar"
"fmt"
"sync"
)
type FeatureFlag int
const (
unused FeatureFlag = iota // unused is used for testing
AllowAccountDeactivation
AllowKeyRollover
ResubmitMissingSCTsOnly
UseAIAIssuerURL
AllowTLS02Challenges
GenerateOCSPEarly
// For new-authz requests, if there is no valid authz, but there is a pending
// authz, return that instead of creating a new one.
ReusePendingAuthz
CountCertificatesExact
RandomDirectoryEntry
IPv6First
DirectoryMeta
AllowRenewalFirstRL
RecheckCAA
LegacyCAA
UDPDNS
)
// List of features and their default value, protected by fMu
var features = map[FeatureFlag]bool{
unused: false,
AllowAccountDeactivation: false,
AllowKeyRollover: false,
ResubmitMissingSCTsOnly: false,
UseAIAIssuerURL: false,
AllowTLS02Challenges: false,
GenerateOCSPEarly: false,
ReusePendingAuthz: false,
CountCertificatesExact: false,
RandomDirectoryEntry: false,
IPv6First: false,
DirectoryMeta: false,
AllowRenewalFirstRL: false,
RecheckCAA: false,
LegacyCAA: false,
UDPDNS: false,
}
var fMu = new(sync.RWMutex)
var initial = map[FeatureFlag]bool{}
var nameToFeature = make(map[string]FeatureFlag, len(features))
func init() {
for f, v := range features {
nameToFeature[f.String()] = f
initial[f] = v
}
}
// expvar.Set requires a type that satisfies the expvar.Var interface,
// since neither string nor bool implement this interface we require
// a basic shim.
type boolVar bool
func (b boolVar) String() string { return fmt.Sprintf("%t", b) }
// Set accepts a list of features and whether they should
// be enabled or disabled, it will return a error if passed
// a feature name that it doesn't know
func Set(featureSet map[string]bool) error {
fMu.Lock()
defer fMu.Unlock()
for n, v := range featureSet {
f, present := nameToFeature[n]
if !present {
return fmt.Errorf("feature '%s' doesn't exist", n)
}
features[f] = v
}
return nil
}
// Export populates a expvar.Map with the state of all
// of the features.
func Export(m *expvar.Map) {
fMu.RLock()
defer fMu.RUnlock()
for f, v := range features {
m.Set(f.String(), boolVar(v))
}
}
// Enabled returns true if the feature is enabled or false
// if it isn't, it will panic if passed a feature that it
// doesn't know.
func Enabled(n FeatureFlag) bool {
fMu.RLock()
defer fMu.RUnlock()
v, present := features[n]
if !present {
panic(fmt.Sprintf("feature '%s' doesn't exist", n.String()))
}
return v
}
// Reset resets the features to their initial state
func Reset() {
fMu.Lock()
defer fMu.Unlock()
for k, v := range initial {
features[k] = v
}
}