forked from scylladb/scylla-operator
/
patch.go
82 lines (68 loc) · 2.39 KB
/
patch.go
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package util
import (
"encoding/json"
"github.com/pkg/errors"
"github.com/scylladb/scylla-operator/pkg/naming"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/strategicpatch"
"k8s.io/client-go/kubernetes"
)
// UpgradeStatefulSetScyllaImage attempts to set the image of a StatefulSet
func UpgradeStatefulSetScyllaImage(sts *appsv1.StatefulSet, image string, kubeClient kubernetes.Interface) error {
upgradeSts := sts.DeepCopy()
idx, err := naming.FindScyllaContainer(upgradeSts.Spec.Template.Spec.Containers)
if err != nil {
return errors.WithStack(err)
}
upgradeSts.Spec.Template.Spec.Containers[idx].Image = image
return PatchStatefulSet(sts, upgradeSts, kubeClient)
}
// ScaleStatefulSet attempts to scale a StatefulSet by the given amount
func ScaleStatefulSet(sts *appsv1.StatefulSet, amount int32, kubeClient kubernetes.Interface) error {
updatedSts := sts.DeepCopy()
updatedReplicas := *updatedSts.Spec.Replicas + amount
if updatedReplicas < 0 {
return errors.New("error, can't scale statefulset below 0 replicas")
}
updatedSts.Spec.Replicas = &updatedReplicas
err := PatchStatefulSet(sts, updatedSts, kubeClient)
return err
}
// PatchStatefulSet patches the old StatefulSet so that it matches the
// new StatefulSet.
func PatchStatefulSet(old, new *appsv1.StatefulSet, kubeClient kubernetes.Interface) error {
oldJSON, err := json.Marshal(old)
if err != nil {
return errors.WithStack(err)
}
newJSON, err := json.Marshal(new)
if err != nil {
return errors.WithStack(err)
}
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldJSON, newJSON, appsv1.StatefulSet{})
if err != nil {
return errors.WithStack(err)
}
_, err = kubeClient.AppsV1().StatefulSets(old.Namespace).Patch(old.Name, types.StrategicMergePatchType, patchBytes)
return errors.WithStack(err)
}
// PatchService patches the old Service so that it matches the
// new Service.
func PatchService(old, new *corev1.Service, kubeClient kubernetes.Interface) error {
oldJSON, err := json.Marshal(old)
if err != nil {
return err
}
newJSON, err := json.Marshal(new)
if err != nil {
return err
}
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldJSON, newJSON, corev1.Service{})
if err != nil {
return err
}
_, err = kubeClient.CoreV1().Services(old.Namespace).Patch(old.Name, types.StrategicMergePatchType, patchBytes)
return err
}