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reststorage.go
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reststorage.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.
package nodemetrics
import (
"context"
"fmt"
"time"
"github.com/kubernetes-incubator/metrics-server/pkg/provider"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apiserver/pkg/registry/generic"
"k8s.io/apiserver/pkg/registry/rest"
v1listers "k8s.io/client-go/listers/core/v1"
"k8s.io/klog"
"k8s.io/metrics/pkg/apis/metrics"
_ "k8s.io/metrics/pkg/apis/metrics/install"
)
type MetricStorage struct {
groupResource schema.GroupResource
prov provider.NodeMetricsProvider
nodeLister v1listers.NodeLister
}
var _ rest.KindProvider = &MetricStorage{}
var _ rest.Storage = &MetricStorage{}
var _ rest.Getter = &MetricStorage{}
var _ rest.Lister = &MetricStorage{}
var _ rest.Scoper = &MetricStorage{}
func NewStorage(groupResource schema.GroupResource, prov provider.NodeMetricsProvider, nodeLister v1listers.NodeLister) *MetricStorage {
return &MetricStorage{
groupResource: groupResource,
prov: prov,
nodeLister: nodeLister,
}
}
// Storage interface
func (m *MetricStorage) New() runtime.Object {
return &metrics.NodeMetrics{}
}
// KindProvider interface
func (m *MetricStorage) Kind() string {
return "NodeMetrics"
}
// Lister interface
func (m *MetricStorage) NewList() runtime.Object {
return &metrics.NodeMetricsList{}
}
// Lister interface
func (m *MetricStorage) List(ctx context.Context, options *metainternalversion.ListOptions) (runtime.Object, error) {
labelSelector := labels.Everything()
fieldSelector := fields.Everything()
if options != nil && options.LabelSelector != nil {
labelSelector = options.LabelSelector
}
if options != nil && options.FieldSelector != nil {
fieldSelector = options.FieldSelector
}
nodes, err := m.nodeLister.ListWithPredicate(func(node *v1.Node) bool {
if labelSelector.Empty() && fieldSelector.Empty() {
return true
}
fieldsSet := generic.AddObjectMetaFieldsSet(make(fields.Set, 2), &node.ObjectMeta, true)
return labelSelector.Matches(labels.Set(node.Labels)) && fieldSelector.Matches(fieldsSet)
})
if err != nil {
errMsg := fmt.Errorf("Error while listing nodes for selector %v: %v", labelSelector, err)
klog.Error(errMsg)
return &metrics.NodeMetricsList{}, errMsg
}
names := make([]string, len(nodes))
for i, node := range nodes {
names[i] = node.Name
}
metricsItems, err := m.getNodeMetrics(names...)
if err != nil {
errMsg := fmt.Errorf("Error while fetching node metrics for selector %v: %v", labelSelector, err)
klog.Error(errMsg)
return &metrics.NodeMetricsList{}, errMsg
}
return &metrics.NodeMetricsList{Items: metricsItems}, nil
}
func (m *MetricStorage) Get(ctx context.Context, name string, opts *metav1.GetOptions) (runtime.Object, error) {
nodeMetrics, err := m.getNodeMetrics(name)
if err == nil && len(nodeMetrics) == 0 {
err = fmt.Errorf("no metrics known for node %q", name)
}
if err != nil {
klog.Errorf("unable to fetch node metrics for node %q: %v", name, err)
return nil, errors.NewNotFound(m.groupResource, name)
}
return &nodeMetrics[0], nil
}
func (m *MetricStorage) getNodeMetrics(names ...string) ([]metrics.NodeMetrics, error) {
timestamps, usages, err := m.prov.GetNodeMetrics(names...)
if err != nil {
return nil, err
}
res := make([]metrics.NodeMetrics, 0, len(names))
for i, name := range names {
if usages[i] == nil {
klog.Errorf("unable to fetch node metrics for node %q: no metrics known for node", name)
continue
}
res = append(res, metrics.NodeMetrics{
ObjectMeta: metav1.ObjectMeta{
Name: name,
CreationTimestamp: metav1.NewTime(time.Now()),
},
Timestamp: metav1.NewTime(timestamps[i].Timestamp),
Window: metav1.Duration{Duration: timestamps[i].Window},
Usage: usages[i],
})
}
return res, nil
}
func (m *MetricStorage) NamespaceScoped() bool {
return false
}