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statefulset.go
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statefulset.go
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// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 kubernetes
import (
"context"
appsv1 "k8s.io/api/apps/v1"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// StatefulSetSource is a function that produces a slice of StatefulSets or an error.
type StatefulSetSource func() ([]*appsv1.StatefulSet, error)
// StatefulSetLister is a lister of StatefulSets.
type StatefulSetLister interface {
// List lists all StatefulSets that match the given selector.
List(selector labels.Selector) ([]*appsv1.StatefulSet, error)
// StatefulSets yields a StatefulSetNamespaceLister for the given namespace.
StatefulSets(namespace string) StatefulSetNamespaceLister
}
// StatefulSetNamespaceLister is a lister of StatefulSets for a specific namespace.
type StatefulSetNamespaceLister interface {
// List lists all StatefulSets that match the given selector in the current namespace.
List(selector labels.Selector) ([]*appsv1.StatefulSet, error)
// Get retrieves the StatefulSet with the given name in the current namespace.
Get(name string) (*appsv1.StatefulSet, error)
}
type statefulSetLister struct {
source StatefulSetSource
}
type statefulSetNamespaceLister struct {
source StatefulSetSource
namespace string
}
// NewStatefulSetLister creates a new StatefulSetLister form the given StatefulSetSource.
func NewStatefulSetLister(source StatefulSetSource) StatefulSetLister {
return &statefulSetLister{source: source}
}
func filterStatefulSets(source StatefulSetSource, filter func(*appsv1.StatefulSet) bool) ([]*appsv1.StatefulSet, error) {
statefulSets, err := source()
if err != nil {
return nil, err
}
var out []*appsv1.StatefulSet
for _, statefulSet := range statefulSets {
if filter(statefulSet) {
out = append(out, statefulSet)
}
}
return out, nil
}
func (d *statefulSetLister) List(selector labels.Selector) ([]*appsv1.StatefulSet, error) {
return filterStatefulSets(d.source, func(statefulSet *appsv1.StatefulSet) bool {
return selector.Matches(labels.Set(statefulSet.Labels))
})
}
func (d *statefulSetLister) StatefulSets(namespace string) StatefulSetNamespaceLister {
return &statefulSetNamespaceLister{
source: d.source,
namespace: namespace,
}
}
func (d *statefulSetNamespaceLister) Get(name string) (*appsv1.StatefulSet, error) {
statefulSets, err := filterStatefulSets(d.source, func(statefulSet *appsv1.StatefulSet) bool {
return statefulSet.Namespace == d.namespace && statefulSet.Name == name
})
if err != nil {
return nil, err
}
if len(statefulSets) == 0 {
return nil, apierrors.NewNotFound(appsv1.Resource("StatefulSets"), name)
}
return statefulSets[0], nil
}
func (d *statefulSetNamespaceLister) List(selector labels.Selector) ([]*appsv1.StatefulSet, error) {
return filterStatefulSets(d.source, func(statefulSet *appsv1.StatefulSet) bool {
return statefulSet.Namespace == d.namespace && selector.Matches(labels.Set(statefulSet.Labels))
})
}
// GetContainerResourcesInStatefulSet returns the containers resources in StatefulSet.
func GetContainerResourcesInStatefulSet(ctx context.Context, k8sClient client.Client, key client.ObjectKey) (map[string]*corev1.ResourceRequirements, error) {
statefulSet := &appsv1.StatefulSet{}
if err := k8sClient.Get(ctx, key, statefulSet); err != nil {
if apierrors.IsNotFound(err) {
return nil, nil
}
return nil, err
}
resourcesPerContainer := make(map[string]*corev1.ResourceRequirements)
for _, container := range statefulSet.Spec.Template.Spec.Containers {
resourcesPerContainer[container.Name] = container.Resources.DeepCopy()
}
return resourcesPerContainer, nil
}