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scale.go
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scale.go
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package util
import (
"github.com/golang/glog"
kapiv1 "k8s.io/api/core/v1"
kextapi "k8s.io/api/extensions/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
kextensionsclient "k8s.io/client-go/kubernetes/typed/extensions/v1beta1"
kapi "k8s.io/kubernetes/pkg/apis/core"
kcoreclient "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/internalversion"
appsapiv1 "github.com/openshift/api/apps/v1"
appsapi "github.com/openshift/origin/pkg/apps/apis/apps"
appsclient "github.com/openshift/origin/pkg/apps/generated/internalclientset/typed/apps/internalversion"
unidlingapi "github.com/openshift/origin/pkg/unidling/api"
)
// TODO: remove the below functions once we get a way to mark/unmark an object as idled
// via the scale endpoint
type AnnotationFunc func(currentReplicas int32, annotations map[string]string)
func NewScaleAnnotater(scales kextensionsclient.ScalesGetter, dcs appsclient.DeploymentConfigsGetter, rcs kcoreclient.ReplicationControllersGetter, changeAnnots AnnotationFunc) *ScaleAnnotater {
return &ScaleAnnotater{
scales: scales,
dcs: dcs,
rcs: rcs,
ChangeAnnotations: changeAnnots,
}
}
type ScaleAnnotater struct {
scales kextensionsclient.ScalesGetter
dcs appsclient.DeploymentConfigsGetter
rcs kcoreclient.ReplicationControllersGetter
ChangeAnnotations AnnotationFunc
}
// ScaleUpdater implements a method "Update" that knows how to update a given object
type ScaleUpdater interface {
Update(*ScaleAnnotater, runtime.Object, *kextapi.Scale) error
}
// ScaleUpdater implements unidlingutil.ScaleUpdater
type scaleUpdater struct {
encoder runtime.Encoder
namespace string
dcGetter appsclient.DeploymentConfigsGetter
rcGetter kcoreclient.ReplicationControllersGetter
}
func NewScaleUpdater(encoder runtime.Encoder, namespace string, dcGetter appsclient.DeploymentConfigsGetter, rcGetter kcoreclient.ReplicationControllersGetter) ScaleUpdater {
return scaleUpdater{
encoder: encoder,
namespace: namespace,
dcGetter: dcGetter,
rcGetter: rcGetter,
}
}
func (s scaleUpdater) Update(annotator *ScaleAnnotater, obj runtime.Object, scale *kextapi.Scale) error {
var (
err error
patchBytes, originalObj, newObj []byte
)
originalObj, err = runtime.Encode(s.encoder, obj)
if err != nil {
return err
}
switch typedObj := obj.(type) {
case *appsapi.DeploymentConfig:
if typedObj.Annotations == nil {
typedObj.Annotations = make(map[string]string)
}
annotator.ChangeAnnotations(typedObj.Spec.Replicas, typedObj.Annotations)
typedObj.Spec.Replicas = scale.Spec.Replicas
newObj, err = runtime.Encode(s.encoder, typedObj)
if err != nil {
return err
}
patchBytes, err = strategicpatch.CreateTwoWayMergePatch(originalObj, newObj, &appsapiv1.DeploymentConfig{})
if err != nil {
return err
}
_, err = s.dcGetter.DeploymentConfigs(s.namespace).Patch(typedObj.Name, types.StrategicMergePatchType, patchBytes)
case *kapi.ReplicationController:
if typedObj.Annotations == nil {
typedObj.Annotations = make(map[string]string)
}
annotator.ChangeAnnotations(typedObj.Spec.Replicas, typedObj.Annotations)
typedObj.Spec.Replicas = scale.Spec.Replicas
newObj, err = runtime.Encode(s.encoder, typedObj)
if err != nil {
return err
}
patchBytes, err = strategicpatch.CreateTwoWayMergePatch(originalObj, newObj, &kapiv1.ReplicationController{})
if err != nil {
return err
}
_, err = s.rcGetter.ReplicationControllers(s.namespace).Patch(typedObj.Name, types.StrategicMergePatchType, patchBytes)
}
return err
}
// getObjectWithScale either fetches a known type of object and constructs a Scale from that, or uses the scale
// subresource to fetch a Scale by itself.
func (c *ScaleAnnotater) GetObjectWithScale(namespace string, ref unidlingapi.CrossGroupObjectReference) (runtime.Object, *kextapi.Scale, error) {
var obj runtime.Object
var err error
var scale *kextapi.Scale
switch {
case ref.Kind == "DeploymentConfig" && (ref.Group == appsapi.GroupName || ref.Group == appsapi.LegacyGroupName):
var dc *appsapi.DeploymentConfig
dc, err = c.dcs.DeploymentConfigs(namespace).Get(ref.Name, metav1.GetOptions{})
if err != nil {
return nil, nil, err
}
scale = &kextapi.Scale{
Spec: kextapi.ScaleSpec{Replicas: dc.Spec.Replicas},
}
obj = dc
case ref.Kind == "ReplicationController" && ref.Group == kapi.GroupName:
var rc *kapi.ReplicationController
rc, err = c.rcs.ReplicationControllers(namespace).Get(ref.Name, metav1.GetOptions{})
if err != nil {
return nil, nil, err
}
scale = &kextapi.Scale{
Spec: kextapi.ScaleSpec{Replicas: rc.Spec.Replicas},
}
obj = rc
default:
scale, err = c.scales.Scales(namespace).Get(ref.Kind, ref.Name)
if err != nil {
return nil, nil, err
}
}
return obj, scale, err
}
// updateObjectScale updates the scale of an object and removes unidling annotations for objects of a know type.
// For objects of an unknown type, it scales the object using the scale subresource
// (and does not change annotations).
func (c *ScaleAnnotater) UpdateObjectScale(updater ScaleUpdater, namespace string, ref unidlingapi.CrossGroupObjectReference, obj runtime.Object, scale *kextapi.Scale) error {
var err error
if obj == nil {
_, err = c.scales.Scales(namespace).Update(ref.Kind, scale)
return err
}
switch obj.(type) {
case *appsapi.DeploymentConfig, *kapi.ReplicationController:
return updater.Update(c, obj, scale)
default:
glog.V(2).Infof("Unidling unknown type %t: using scale interface and not removing annotations", obj)
_, err = c.scales.Scales(namespace).Update(ref.Kind, scale)
}
return err
}