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/
update.go
74 lines (59 loc) · 2.09 KB
/
update.go
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package pdb
import (
"context"
"code.cloudfoundry.org/eirini-controller/k8s/stset"
eiriniv1 "code.cloudfoundry.org/eirini-controller/pkg/apis/eirini/v1"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/api/policy/v1beta1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/intstr"
"k8s.io/client-go/kubernetes/scheme"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
const PdbMinAvailableInstances = "50%"
type Updater struct {
client client.Client
}
func NewUpdater(client client.Client) *Updater {
return &Updater{
client: client,
}
}
func (c *Updater) Update(ctx context.Context, statefulSet *appsv1.StatefulSet, lrp *eiriniv1.LRP) error {
if lrp.Spec.Instances > 1 {
return c.createPDB(ctx, statefulSet, lrp)
}
return c.deletePDB(ctx, statefulSet)
}
func (c *Updater) createPDB(ctx context.Context, statefulSet *appsv1.StatefulSet, lrp *eiriniv1.LRP) error {
minAvailable := intstr.FromString(PdbMinAvailableInstances)
pdb := &v1beta1.PodDisruptionBudget{
ObjectMeta: metav1.ObjectMeta{
Name: statefulSet.Name,
Namespace: statefulSet.Namespace,
Labels: map[string]string{
stset.LabelGUID: lrp.Spec.GUID,
stset.LabelVersion: lrp.Spec.Version,
},
},
Spec: v1beta1.PodDisruptionBudgetSpec{
MinAvailable: &minAvailable,
Selector: stset.StatefulSetLabelSelector(lrp),
},
}
if err := controllerutil.SetOwnerReference(statefulSet, pdb, scheme.Scheme); err != nil {
return errors.Wrap(err, "pdb-updated-failed-to-set-owner-ref")
}
err := c.client.Create(ctx, pdb)
if k8serrors.IsAlreadyExists(err) {
return nil
}
return errors.Wrap(err, "failed to create pod distruption budget")
}
func (c *Updater) deletePDB(ctx context.Context, statefulSet *appsv1.StatefulSet) error {
err := c.client.DeleteAllOf(ctx, &v1beta1.PodDisruptionBudget{}, client.InNamespace(statefulSet.Namespace), client.MatchingFields{"metadata.name": statefulSet.Name})
return errors.Wrap(err, "failed to delete pod distruption budget")
}