mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-11-03 23:40:03 +00:00
51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
/*
|
|
Copyright 2016 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 images
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"k8s.io/api/core/v1"
|
|
"k8s.io/client-go/util/flowcontrol"
|
|
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
|
|
)
|
|
|
|
// throttleImagePulling wraps kubecontainer.ImageService to throttle image
|
|
// pulling based on the given QPS and burst limits. If QPS is zero, defaults
|
|
// to no throttling.
|
|
func throttleImagePulling(imageService kubecontainer.ImageService, qps float32, burst int) kubecontainer.ImageService {
|
|
if qps == 0.0 {
|
|
return imageService
|
|
}
|
|
return &throttledImageService{
|
|
ImageService: imageService,
|
|
limiter: flowcontrol.NewTokenBucketRateLimiter(qps, burst),
|
|
}
|
|
}
|
|
|
|
type throttledImageService struct {
|
|
kubecontainer.ImageService
|
|
limiter flowcontrol.RateLimiter
|
|
}
|
|
|
|
func (ts throttledImageService) PullImage(image kubecontainer.ImageSpec, secrets []v1.Secret) (string, error) {
|
|
if ts.limiter.TryAccept() {
|
|
return ts.ImageService.PullImage(image, secrets)
|
|
}
|
|
return "", fmt.Errorf("pull QPS exceeded.")
|
|
}
|