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puller.go
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puller.go
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/*
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 (
"context"
"time"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/wait"
runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
)
type pullResult struct {
imageRef string
err error
pullDuration time.Duration
}
type imagePuller interface {
pullImage(context.Context, kubecontainer.ImageSpec, []v1.Secret, chan<- pullResult, *runtimeapi.PodSandboxConfig)
}
var _, _ imagePuller = ¶llelImagePuller{}, &serialImagePuller{}
type parallelImagePuller struct {
imageService kubecontainer.ImageService
tokens chan struct{}
}
func newParallelImagePuller(imageService kubecontainer.ImageService, maxParallelImagePulls *int32) imagePuller {
if maxParallelImagePulls == nil || *maxParallelImagePulls < 1 {
return ¶llelImagePuller{imageService, nil}
}
return ¶llelImagePuller{imageService, make(chan struct{}, *maxParallelImagePulls)}
}
func (pip *parallelImagePuller) pullImage(ctx context.Context, spec kubecontainer.ImageSpec, pullSecrets []v1.Secret, pullChan chan<- pullResult, podSandboxConfig *runtimeapi.PodSandboxConfig) {
go func() {
if pip.tokens != nil {
pip.tokens <- struct{}{}
defer func() { <-pip.tokens }()
}
startTime := time.Now()
imageRef, err := pip.imageService.PullImage(ctx, spec, pullSecrets, podSandboxConfig)
pullChan <- pullResult{
imageRef: imageRef,
err: err,
pullDuration: time.Since(startTime),
}
}()
}
// Maximum number of image pull requests than can be queued.
const maxImagePullRequests = 10
type serialImagePuller struct {
imageService kubecontainer.ImageService
pullRequests chan *imagePullRequest
}
func newSerialImagePuller(imageService kubecontainer.ImageService) imagePuller {
imagePuller := &serialImagePuller{imageService, make(chan *imagePullRequest, maxImagePullRequests)}
go wait.Until(imagePuller.processImagePullRequests, time.Second, wait.NeverStop)
return imagePuller
}
type imagePullRequest struct {
ctx context.Context
spec kubecontainer.ImageSpec
pullSecrets []v1.Secret
pullChan chan<- pullResult
podSandboxConfig *runtimeapi.PodSandboxConfig
}
func (sip *serialImagePuller) pullImage(ctx context.Context, spec kubecontainer.ImageSpec, pullSecrets []v1.Secret, pullChan chan<- pullResult, podSandboxConfig *runtimeapi.PodSandboxConfig) {
sip.pullRequests <- &imagePullRequest{
ctx: ctx,
spec: spec,
pullSecrets: pullSecrets,
pullChan: pullChan,
podSandboxConfig: podSandboxConfig,
}
}
func (sip *serialImagePuller) processImagePullRequests() {
for pullRequest := range sip.pullRequests {
startTime := time.Now()
imageRef, err := sip.imageService.PullImage(pullRequest.ctx, pullRequest.spec, pullRequest.pullSecrets, pullRequest.podSandboxConfig)
pullRequest.pullChan <- pullResult{
imageRef: imageRef,
err: err,
pullDuration: time.Since(startTime),
}
}
}