64af1adace
* plumb context from CRI calls through kubelet * clean up extra timeouts * try fixing incorrectly cancelled context
99 lines
3.0 KiB
Go
99 lines
3.0 KiB
Go
/*
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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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"context"
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"time"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/util/wait"
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runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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)
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type pullResult struct {
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imageRef string
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err error
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}
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type imagePuller interface {
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pullImage(context.Context, kubecontainer.ImageSpec, []v1.Secret, chan<- pullResult, *runtimeapi.PodSandboxConfig)
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}
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var _, _ imagePuller = ¶llelImagePuller{}, &serialImagePuller{}
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type parallelImagePuller struct {
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imageService kubecontainer.ImageService
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}
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func newParallelImagePuller(imageService kubecontainer.ImageService) imagePuller {
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return ¶llelImagePuller{imageService}
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}
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func (pip *parallelImagePuller) pullImage(ctx context.Context, spec kubecontainer.ImageSpec, pullSecrets []v1.Secret, pullChan chan<- pullResult, podSandboxConfig *runtimeapi.PodSandboxConfig) {
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go func() {
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imageRef, err := pip.imageService.PullImage(ctx, spec, pullSecrets, podSandboxConfig)
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pullChan <- pullResult{
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imageRef: imageRef,
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err: err,
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}
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}()
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}
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// Maximum number of image pull requests than can be queued.
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const maxImagePullRequests = 10
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type serialImagePuller struct {
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imageService kubecontainer.ImageService
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pullRequests chan *imagePullRequest
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}
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func newSerialImagePuller(imageService kubecontainer.ImageService) imagePuller {
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imagePuller := &serialImagePuller{imageService, make(chan *imagePullRequest, maxImagePullRequests)}
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go wait.Until(imagePuller.processImagePullRequests, time.Second, wait.NeverStop)
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return imagePuller
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}
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type imagePullRequest struct {
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ctx context.Context
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spec kubecontainer.ImageSpec
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pullSecrets []v1.Secret
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pullChan chan<- pullResult
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podSandboxConfig *runtimeapi.PodSandboxConfig
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}
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func (sip *serialImagePuller) pullImage(ctx context.Context, spec kubecontainer.ImageSpec, pullSecrets []v1.Secret, pullChan chan<- pullResult, podSandboxConfig *runtimeapi.PodSandboxConfig) {
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sip.pullRequests <- &imagePullRequest{
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ctx: ctx,
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spec: spec,
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pullSecrets: pullSecrets,
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pullChan: pullChan,
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podSandboxConfig: podSandboxConfig,
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}
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}
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func (sip *serialImagePuller) processImagePullRequests() {
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for pullRequest := range sip.pullRequests {
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imageRef, err := sip.imageService.PullImage(pullRequest.ctx, pullRequest.spec, pullRequest.pullSecrets, pullRequest.podSandboxConfig)
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pullRequest.pullChan <- pullResult{
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imageRef: imageRef,
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err: err,
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}
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}
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}
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