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poddisruptionbudget.go
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poddisruptionbudget.go
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// Copyright 2019 Orange
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cassandracluster
import (
"context"
"fmt"
policyv1beta1 "k8s.io/api/policy/v1beta1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
)
//GetPodDisruptionBudget return the PodDisruptionBudget name from the cluster in the namespace
func (rcc *ReconcileCassandraCluster) GetPodDisruptionBudget(namespace,
name string) (*policyv1beta1.PodDisruptionBudget, error) {
pdb := &policyv1beta1.PodDisruptionBudget{
TypeMeta: metav1.TypeMeta{
Kind: "PodDisruptionBudget",
APIVersion: "policy/v1beta1",
},
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: namespace,
},
}
return pdb, rcc.client.Get(context.TODO(), types.NamespacedName{Name: name, Namespace: namespace}, pdb)
}
//CreatePodDisruptionBudget create a new PodDisruptionBudget pdb
func (rcc *ReconcileCassandraCluster) CreatePodDisruptionBudget(pdb *policyv1beta1.PodDisruptionBudget) error {
err := rcc.client.Create(context.TODO(), pdb)
if err != nil {
if !apierrors.IsAlreadyExists(err) {
return fmt.Errorf("PodDisruptionBudget already exists: %cc", err)
}
return fmt.Errorf("failed to create cassandra PodDisruptionBudget: %cc", err)
}
return nil
}
//DeletePodDisruptionBudget delete a new PodDisruptionBudget pdb
func (rcc *ReconcileCassandraCluster) DeletePodDisruptionBudget(pdb *policyv1beta1.PodDisruptionBudget) error {
err := rcc.client.Delete(context.TODO(), pdb)
if err != nil {
return fmt.Errorf("failed to delete cassandra PodDisruptionBudget: %cc", err)
}
return nil
}
//UpdatePodDisruptionBudget updates an existing PodDisruptionBudget pdb
func (rcc *ReconcileCassandraCluster) UpdatePodDisruptionBudget(pdb *policyv1beta1.PodDisruptionBudget) error {
err := rcc.client.Update(context.TODO(), pdb)
if err != nil {
if !apierrors.IsAlreadyExists(err) {
return fmt.Errorf("PodDisruptionBudget already exists: %cc", err)
}
return fmt.Errorf("failed to update cassandra PodDisruptionBudget: %cc", err)
}
return nil
}
//CreateOrUpdatePodDisruptionBudget Create PodDisruptionBudget if not existing, or update it if existing.
func (rcc *ReconcileCassandraCluster) CreateOrUpdatePodDisruptionBudget(pdb *policyv1beta1.PodDisruptionBudget) error {
var err error
rcc.storedPdb, err = rcc.GetPodDisruptionBudget(pdb.Namespace, pdb.Name)
if err != nil {
// If no resource we need to create.
if apierrors.IsNotFound(err) {
return rcc.CreatePodDisruptionBudget(pdb)
}
return err
}
if *rcc.storedPdb.Spec.MaxUnavailable != *pdb.Spec.MaxUnavailable {
rcc.DeletePodDisruptionBudget(pdb)
//rcc.storedPdb = pdb
return rcc.CreatePodDisruptionBudget(pdb)
}
//We can't Update PorDisruptionBudget
return nil
/*
// Already exists, need to Update.
pdb.ResourceVersion = rcc.storedPdb.ResourceVersion
return rcc.UpdatePodDisruptionBudget(pdb)
*/
}