Replace godep with dep

vendor/k8s.io/kubernetes/pkg/kubelet/images/puller.go

@@ -0,0 +1,92 @@
+/*
+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 (
+	"time"
+
+	"k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/util/wait"
+	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+)
+
+type pullResult struct {
+	imageRef string
+	err      error
+}
+
+type imagePuller interface {
+	pullImage(kubecontainer.ImageSpec, []v1.Secret, chan<- pullResult)
+}
+
+var _, _ imagePuller = &parallelImagePuller{}, &serialImagePuller{}
+
+type parallelImagePuller struct {
+	imageService kubecontainer.ImageService
+}
+
+func newParallelImagePuller(imageService kubecontainer.ImageService) imagePuller {
+	return &parallelImagePuller{imageService}
+}
+
+func (pip *parallelImagePuller) pullImage(spec kubecontainer.ImageSpec, pullSecrets []v1.Secret, pullChan chan<- pullResult) {
+	go func() {
+		imageRef, err := pip.imageService.PullImage(spec, pullSecrets)
+		pullChan <- pullResult{
+			imageRef: imageRef,
+			err:      err,
+		}
+	}()
+}
+
+// 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 {
+	spec        kubecontainer.ImageSpec
+	pullSecrets []v1.Secret
+	pullChan    chan<- pullResult
+}
+
+func (sip *serialImagePuller) pullImage(spec kubecontainer.ImageSpec, pullSecrets []v1.Secret, pullChan chan<- pullResult) {
+	sip.pullRequests <- &imagePullRequest{
+		spec:        spec,
+		pullSecrets: pullSecrets,
+		pullChan:    pullChan,
+	}
+}
+
+func (sip *serialImagePuller) processImagePullRequests() {
+	for pullRequest := range sip.pullRequests {
+		imageRef, err := sip.imageService.PullImage(pullRequest.spec, pullRequest.pullSecrets)
+		pullRequest.pullChan <- pullResult{
+			imageRef: imageRef,
+			err:      err,
+		}
+	}
+}