51 lines
1.5 KiB
Go
51 lines
1.5 KiB
Go
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/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package images
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import (
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"fmt"
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"k8s.io/kubernetes/pkg/api/v1"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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"k8s.io/kubernetes/pkg/util/flowcontrol"
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)
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// throttleImagePulling wraps kubecontainer.ImageService to throttle image
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// pulling based on the given QPS and burst limits. If QPS is zero, defaults
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// to no throttling.
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func throttleImagePulling(imageService kubecontainer.ImageService, qps float32, burst int) kubecontainer.ImageService {
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if qps == 0.0 {
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return imageService
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}
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return &throttledImageService{
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ImageService: imageService,
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limiter: flowcontrol.NewTokenBucketRateLimiter(qps, burst),
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}
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}
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type throttledImageService struct {
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kubecontainer.ImageService
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limiter flowcontrol.RateLimiter
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}
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func (ts throttledImageService) PullImage(image kubecontainer.ImageSpec, secrets []v1.Secret) (string, error) {
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if ts.limiter.TryAccept() {
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return ts.ImageService.PullImage(image, secrets)
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}
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return "", fmt.Errorf("pull QPS exceeded.")
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}
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