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observe_featuregates.go
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observe_featuregates.go
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package featuregates
import (
"fmt"
"reflect"
"strings"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/util/sets"
configv1 "github.com/openshift/api/config/v1"
configlistersv1 "github.com/openshift/client-go/config/listers/config/v1"
"github.com/openshift/library-go/pkg/operator/configobserver"
"github.com/openshift/library-go/pkg/operator/events"
)
type FeatureGateLister interface {
FeatureGateLister() configlistersv1.FeatureGateLister
}
func NewObserveFeatureFlagsFunc(knownFeatures sets.String, configPath []string) configobserver.ObserveConfigFunc {
return (&featureFlags{
allowAll: len(knownFeatures) == 0,
knownFeatures: knownFeatures,
configPath: configPath,
}).ObserveFeatureFlags
}
type featureFlags struct {
allowAll bool
knownFeatures sets.String
configPath []string
}
// ObserveFeatureFlags fills in --feature-flags for the kube-apiserver
func (f *featureFlags) ObserveFeatureFlags(genericListers configobserver.Listers, recorder events.Recorder, existingConfig map[string]interface{}) (map[string]interface{}, []error) {
listers := genericListers.(FeatureGateLister)
errs := []error{}
prevObservedConfig := map[string]interface{}{}
currentConfigValue, _, err := unstructured.NestedStringSlice(existingConfig, f.configPath...)
if err != nil {
errs = append(errs, err)
}
if len(currentConfigValue) > 0 {
if err := unstructured.SetNestedStringSlice(prevObservedConfig, currentConfigValue, f.configPath...); err != nil {
errs = append(errs, err)
}
}
observedConfig := map[string]interface{}{}
configResource, err := listers.FeatureGateLister().Get("cluster")
// if we have no featuregate, then the installer and MCO probably still have way to reconcile certain custom resources
// we will assume that this means the same as default and hope for the best
if apierrors.IsNotFound(err) {
configResource = &configv1.FeatureGate{
Spec: configv1.FeatureGateSpec{
FeatureSet: configv1.Default,
},
}
} else if err != nil {
errs = append(errs, err)
return prevObservedConfig, errs
}
var newConfigValue []string
if featureSet, ok := configv1.FeatureSets[configResource.Spec.FeatureSet]; ok {
for _, enable := range featureSet.Enabled {
// only add whitelisted feature flags
if !f.allowAll && !f.knownFeatures.Has(enable) {
continue
}
newConfigValue = append(newConfigValue, enable+"=true")
}
for _, disable := range featureSet.Disabled {
// only add whitelisted feature flags
if !f.allowAll && !f.knownFeatures.Has(disable) {
continue
}
newConfigValue = append(newConfigValue, disable+"=false")
}
} else {
errs = append(errs, fmt.Errorf(".spec.featureSet %q not found", featureSet))
return prevObservedConfig, errs
}
if !reflect.DeepEqual(currentConfigValue, newConfigValue) {
recorder.Eventf("ObserveFeatureFlagsUpdated", "Updated %v to %s", strings.Join(f.configPath, "."), strings.Join(newConfigValue, ","))
}
if err := unstructured.SetNestedStringSlice(observedConfig, newConfigValue, f.configPath...); err != nil {
recorder.Warningf("ObserveFeatureFlags", "Failed setting %v: %v", strings.Join(f.configPath, "."), err)
errs = append(errs, err)
}
return observedConfig, errs
}