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storage.go
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storage.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 storage
import (
"sync"
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/metrics/pkg/apis/metrics"
)
// nodeStorage is a thread save nodeStorage for node and pod metrics.
type storage struct {
mu sync.RWMutex
pods podStorage
nodes nodeStorage
}
var _ Storage = (*storage)(nil)
func NewStorage(metricResolution time.Duration) *storage {
return &storage{pods: podStorage{metricResolution: metricResolution}}
}
// Ready returns true if metrics-server's storage has accumulated enough metric
// points to serve NodeMetrics.
func (s *storage) Ready() bool {
s.mu.RLock()
defer s.mu.RUnlock()
return len(s.nodes.prev) != 0 || len(s.pods.prev) != 0
}
func (s *storage) GetNodeMetrics(nodes ...*corev1.Node) ([]metrics.NodeMetrics, error) {
s.mu.RLock()
defer s.mu.RUnlock()
return s.nodes.GetMetrics(nodes...)
}
func (s *storage) GetPodMetrics(pods ...*metav1.PartialObjectMetadata) ([]metrics.PodMetrics, error) {
s.mu.RLock()
defer s.mu.RUnlock()
return s.pods.GetMetrics(pods...)
}
func (s *storage) Store(batch *MetricsBatch) {
s.mu.Lock()
defer s.mu.Unlock()
s.nodes.Store(batch)
s.pods.Store(batch)
}