/
pod.go
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/
pod.go
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/*
Copyright 2018 The Kubernetes Authors.
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.
This file may have been modified by The KubeAdmiral Authors
("KubeAdmiral Modifications"). All KubeAdmiral Modifications
are Copyright 2023 The KubeAdmiral Authors.
*/
package resource
import (
"context"
"fmt"
"sort"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
metav1beta1 "k8s.io/apimachinery/pkg/apis/meta/v1beta1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/registry/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/component-base/metrics/legacyregistry"
"k8s.io/klog/v2"
"k8s.io/metrics/pkg/apis/metrics"
_ "k8s.io/metrics/pkg/apis/metrics/install"
)
type PodMetrics struct {
groupResource schema.GroupResource
metrics PodMetricsGetter
podLister cache.GenericLister
}
var (
_ rest.KindProvider = &PodMetrics{}
_ rest.Storage = &PodMetrics{}
_ rest.Getter = &PodMetrics{}
_ rest.Lister = &PodMetrics{}
_ rest.TableConvertor = &PodMetrics{}
_ rest.Scoper = &PodMetrics{}
)
func NewPodMetrics(groupResource schema.GroupResource, metrics PodMetricsGetter, podLister cache.GenericLister) *PodMetrics {
registerIntoLegacyRegistryOnce.Do(func() {
err := RegisterAPIMetrics(legacyregistry.Register)
if err != nil {
klog.ErrorS(err, "Failed to register resource metrics")
}
})
return &PodMetrics{
groupResource: groupResource,
metrics: metrics,
podLister: podLister,
}
}
// New implements rest.Storage interface
func (m *PodMetrics) New() runtime.Object {
return &metrics.PodMetrics{}
}
// Destroy implements rest.Storage interface
func (m *PodMetrics) Destroy() {
}
// Kind implements rest.KindProvider interface
func (m *PodMetrics) Kind() string {
return "PodMetrics"
}
// NewList implements rest.Lister interface
func (m *PodMetrics) NewList() runtime.Object {
return &metrics.PodMetricsList{}
}
// List implements rest.Lister interface
func (m *PodMetrics) List(ctx context.Context, options *metainternalversion.ListOptions) (runtime.Object, error) {
pods, err := m.pods(ctx, options)
if err != nil {
return &metrics.PodMetricsList{}, err
}
ms, err := m.getMetrics(pods...)
if err != nil {
namespace := genericapirequest.NamespaceValue(ctx)
klog.ErrorS(err, "Failed reading pods metrics", "namespace", klog.KRef("", namespace))
return &metrics.PodMetricsList{}, fmt.Errorf("failed reading pods metrics: %w", err)
}
return &metrics.PodMetricsList{Items: ms}, nil
}
func (m *PodMetrics) pods(ctx context.Context, options *metainternalversion.ListOptions) ([]runtime.Object, error) {
labelSelector := labels.Everything()
if options != nil && options.LabelSelector != nil {
labelSelector = options.LabelSelector
}
namespace := genericapirequest.NamespaceValue(ctx)
pods, err := m.podLister.ByNamespace(namespace).List(labelSelector)
if err != nil {
klog.ErrorS(err, "Failed listing pods", "labelSelector", labelSelector, "namespace", klog.KRef("", namespace))
return nil, fmt.Errorf("failed listing pods: %w", err)
}
partialPods := make([]runtime.Object, 0, len(pods))
for _, obj := range pods {
var partialObj *metav1.PartialObjectMetadata
switch t := obj.(type) {
case *metav1.PartialObjectMetadata:
partialObj = t
case metav1.Object:
partialObj = meta.AsPartialObjectMetadata(t)
default:
continue
}
partialPods = append(partialPods, partialObj)
}
if options != nil && options.FieldSelector != nil {
partialPods = filterPartialObjectMetadata(partialPods, options.FieldSelector)
}
return partialPods, err
}
// Get implements rest.Getter interface
func (m *PodMetrics) Get(ctx context.Context, name string, opts *metav1.GetOptions) (runtime.Object, error) {
namespace := genericapirequest.NamespaceValue(ctx)
obj, err := m.podLister.ByNamespace(namespace).Get(name)
if err != nil {
if apierrors.IsNotFound(err) {
// return not-found errors directly
return &metrics.PodMetrics{}, err
}
klog.ErrorS(err, "Failed getting pod", "pod", klog.KRef(namespace, name))
return &metrics.PodMetrics{}, fmt.Errorf("failed getting pod: %w", err)
}
if obj == nil {
return &metrics.PodMetrics{}, apierrors.NewNotFound(corev1.Resource("pods"), fmt.Sprintf("%s/%s", namespace, name))
}
var partialPod *metav1.PartialObjectMetadata
switch t := obj.(type) {
case *metav1.PartialObjectMetadata:
partialPod = t
case metav1.Object:
partialPod = meta.AsPartialObjectMetadata(t)
default:
return nil, fmt.Errorf("unexpected type %T", obj)
}
ms, err := m.getMetrics(meta.AsPartialObjectMetadata(partialPod))
if err != nil {
klog.ErrorS(err, "Failed reading pod metrics", "pod", klog.KRef(namespace, name))
return nil, fmt.Errorf("failed pod metrics: %w", err)
}
if len(ms) == 0 {
return nil, apierrors.NewNotFound(m.groupResource, fmt.Sprintf("%s/%s", namespace, name))
}
return &ms[0], nil
}
// ConvertToTable implements rest.TableConvertor interface
func (m *PodMetrics) ConvertToTable(ctx context.Context, object runtime.Object, tableOptions runtime.Object) (*metav1beta1.Table, error) {
var table metav1beta1.Table
switch t := object.(type) {
case *metrics.PodMetrics:
table.ResourceVersion = t.ResourceVersion
table.SelfLink = t.SelfLink //nolint:staticcheck // keep deprecated field to be backward compatible
addPodMetricsToTable(&table, *t)
case *metrics.PodMetricsList:
table.ResourceVersion = t.ResourceVersion
table.SelfLink = t.SelfLink //nolint:staticcheck // keep deprecated field to be backward compatible
table.Continue = t.Continue
addPodMetricsToTable(&table, t.Items...)
default:
}
return &table, nil
}
func (m *PodMetrics) getMetrics(pods ...runtime.Object) ([]metrics.PodMetrics, error) {
objs := make([]*metav1.PartialObjectMetadata, len(pods))
for i, pod := range pods {
objs[i] = pod.(*metav1.PartialObjectMetadata)
}
ms, err := m.metrics.GetPodMetrics(objs...)
if err != nil {
return nil, err
}
for _, m := range ms {
metricFreshness.WithLabelValues().Observe(myClock.Since(m.Timestamp.Time).Seconds())
}
sort.Slice(ms, func(i, j int) bool {
if ms[i].Namespace != ms[j].Namespace {
return ms[i].Namespace < ms[j].Namespace
}
return ms[i].Name < ms[j].Name
})
return ms, nil
}
// NamespaceScoped implements rest.Scoper interface
func (m *PodMetrics) NamespaceScoped() bool {
return true
}