kubelet/dockertools: Add puller interfaces in the containerManager.

pkg/kubelet/dockertools/docker.go

@@ -96,8 +96,8 @@ type throttledDockerPuller struct {
 	limiter util.RateLimiter
 }
 
-// NewDockerPuller creates a new instance of the default implementation of DockerPuller.
-func NewDockerPuller(client DockerInterface, qps float32, burst int) DockerPuller {
+// newDockerPuller creates a new instance of the default implementation of DockerPuller.
+func newDockerPuller(client DockerInterface, qps float32, burst int) DockerPuller {
 	dp := dockerPuller{
 		client:  client,
 		keyring: credentialprovider.NewDockerKeyring(),

pkg/kubelet/dockertools/manager.go

@@ -60,18 +60,25 @@ type DockerManager struct {
 	//      means that some entries may be recycled before a pod has been
 	//      deleted.
 	reasonCache stringCache
+	// TODO(yifan): We export this for testability, so when we have a fake
+	// container manager, then we can unexport this. Also at that time, we
+	// use the concrete type so that we can record the pull failure and eliminate
+	// the image checking in GetPodStatus().
+	Puller DockerPuller
 }
 
 // Ensures DockerManager implements ConatinerRunner.
 var _ kubecontainer.ContainerRunner = new(DockerManager)
 
-func NewDockerManager(client DockerInterface, recorder record.EventRecorder, podInfraContainerImage string) *DockerManager {
+func NewDockerManager(client DockerInterface, recorder record.EventRecorder, podInfraContainerImage string, qps float32, burst int) *DockerManager {
 	reasonCache := stringCache{cache: lru.New(maxReasonCacheEntries)}
 	return &DockerManager{
 		client:                 client,
 		recorder:               recorder,
 		PodInfraContainerImage: podInfraContainerImage,
-		reasonCache:            reasonCache}
+		reasonCache:            reasonCache,
+		Puller:                 newDockerPuller(client, qps, burst),
+	}
 }
 
 // A cache which stores strings keyed by <pod_UID>_<container_name>.
@@ -520,3 +527,11 @@ func makeCapabilites(capAdd []api.CapabilityType, capDrop []api.CapabilityType)
 	}
 	return addCaps, dropCaps
 }
+
+func (self *DockerManager) Pull(image string) error {
+	return self.Puller.Pull(image)
+}
+
+func (self *DockerManager) IsImagePresent(image string) (bool, error) {
+	return self.Puller.IsImagePresent(image)
+}

pkg/kubelet/kubelet.go

@@ -199,7 +199,7 @@ func NewMainKubelet(
 		return nil, fmt.Errorf("failed to initialize image manager: %v", err)
 	}
 	statusManager := newStatusManager(kubeClient)
-	containerManager := dockertools.NewDockerManager(dockerClient, recorder, podInfraContainerImage)
+	containerManager := dockertools.NewDockerManager(dockerClient, recorder, podInfraContainerImage, pullQPS, pullBurst)
 
 	klet := &Kubelet{
 		hostname:               hostname,
@@ -211,8 +211,6 @@ func NewMainKubelet(
 		readinessManager:       kubecontainer.NewReadinessManager(),
 		runner:                 dockertools.NewDockerContainerCommandRunner(dockerClient),
 		httpClient:             &http.Client{},
-		pullQPS:                pullQPS,
-		pullBurst:              pullBurst,
 		sourcesReady:           sourcesReady,
 		clusterDomain:          clusterDomain,
 		clusterDNS:             clusterDNS,
@@ -289,18 +287,12 @@ type Kubelet struct {
 	// Tracks references for reporting events
 	containerRefManager *kubecontainer.RefManager
 
-	// Optional, defaults to simple Docker implementation
-	dockerPuller dockertools.DockerPuller
 	// Optional, defaults to /logs/ from /var/log
 	logServer http.Handler
 	// Optional, defaults to simple Docker implementation
 	runner dockertools.ContainerCommandRunner
 	// Optional, client for http requests, defaults to empty client
 	httpClient httpGetter
-	// Optional, maximum pull QPS from the docker registry, 0.0 means unlimited.
-	pullQPS float32
-	// Optional, maximum burst QPS from the docker registry, must be positive if QPS is > 0.0
-	pullBurst int
 
 	// cAdvisor used for container information.
 	cadvisor cadvisor.Interface
@@ -541,9 +533,6 @@ func (kl *Kubelet) Run(updates <-chan PodUpdate) {
 	if kl.logServer == nil {
 		kl.logServer = http.StripPrefix("/logs/", http.FileServer(http.Dir("/var/log/")))
 	}
-	if kl.dockerPuller == nil {
-		kl.dockerPuller = dockertools.NewDockerPuller(kl.dockerClient, kl.pullQPS, kl.pullBurst)
-	}
 	if kl.kubeClient == nil {
 		glog.Warning("No api server defined - no node status update will be sent.")
 	}
@@ -877,7 +866,7 @@ func (kl *Kubelet) createPodInfraContainer(pod *api.Pod) (dockertools.DockerID,
 		glog.Errorf("Couldn't make a ref to pod %v, container %v: '%v'", pod.Name, container.Name, err)
 	}
 	// TODO: make this a TTL based pull (if image older than X policy, pull)
-	ok, err := kl.dockerPuller.IsImagePresent(container.Image)
+	ok, err := kl.containerManager.IsImagePresent(container.Image)
 	if err != nil {
 		if ref != nil {
 			kl.recorder.Eventf(ref, "failed", "Failed to inspect image %q: %v", container.Image, err)
@@ -919,7 +908,7 @@ func (kl *Kubelet) pullImage(img string, ref *api.ObjectReference) error {
 		metrics.ImagePullLatency.Observe(metrics.SinceInMicroseconds(start))
 	}()
 
-	if err := kl.dockerPuller.Pull(img); err != nil {
+	if err := kl.containerManager.Pull(img); err != nil {
 		if ref != nil {
 			kl.recorder.Eventf(ref, "failed", "Failed to pull image %q: %v", img, err)
 		}
@@ -1033,7 +1022,7 @@ func (kl *Kubelet) pullImageAndRunContainer(pod *api.Pod, container *api.Contain
 		glog.Errorf("Couldn't make a ref to pod %v, container %v: '%v'", pod.Name, container.Name, err)
 	}
 	if container.ImagePullPolicy != api.PullNever {
-		present, err := kl.dockerPuller.IsImagePresent(container.Image)
+		present, err := kl.containerManager.IsImagePresent(container.Image)
 		if err != nil {
 			if ref != nil {
 				kl.recorder.Eventf(ref, "failed", "Failed to inspect image %q: %v", container.Image, err)

pkg/kubelet/kubelet_test.go

@@ -73,12 +73,11 @@ func newTestKubelet(t *testing.T) *TestKubelet {
 	fakeDockerCache := dockertools.NewFakeDockerCache(fakeDocker)
 	fakeRecorder := &record.FakeRecorder{}
 	fakeKubeClient := &testclient.Fake{}
-
 	kubelet := &Kubelet{}
 	kubelet.dockerClient = fakeDocker
 	kubelet.dockerCache = fakeDockerCache
 	kubelet.kubeClient = fakeKubeClient
-	kubelet.dockerPuller = &dockertools.FakeDockerPuller{}
+
 	kubelet.hostname = "testnode"
 	kubelet.networkPlugin, _ = network.InitNetworkPlugin([]network.NetworkPlugin{}, "", network.NewFakeHost(nil))
 	if tempDir, err := ioutil.TempDir("/tmp", "kubelet_test."); err != nil {
@@ -113,7 +112,8 @@ func newTestKubelet(t *testing.T) *TestKubelet {
 	podManager, fakeMirrorClient := newFakePodManager()
 	kubelet.podManager = podManager
 	kubelet.containerRefManager = kubecontainer.NewRefManager()
-	kubelet.containerManager = dockertools.NewDockerManager(fakeDocker, fakeRecorder, dockertools.PodInfraContainerImage)
+	kubelet.containerManager = dockertools.NewDockerManager(fakeDocker, fakeRecorder, dockertools.PodInfraContainerImage, 0, 0)
+	kubelet.containerManager.Puller = &dockertools.FakeDockerPuller{}
 	return &TestKubelet{kubelet, fakeDocker, mockCadvisor, fakeKubeClient, waitGroup, fakeMirrorClient}
 }
 
@@ -593,7 +593,7 @@ func TestSyncPodsCreatesNetAndContainerPullsImage(t *testing.T) {
 	kubelet := testKubelet.kubelet
 	fakeDocker := testKubelet.fakeDocker
 	waitGroup := testKubelet.waitGroup
-	puller := kubelet.dockerPuller.(*dockertools.FakeDockerPuller)
+	puller := kubelet.containerManager.Puller.(*dockertools.FakeDockerPuller)
 	puller.HasImages = []string{}
 	kubelet.containerManager.PodInfraContainerImage = "custom_image_name"
 	fakeDocker.ContainerList = []docker.APIContainers{}
@@ -1249,7 +1249,6 @@ func TestGetRootInfo(t *testing.T) {
 
 	kubelet := Kubelet{
 		dockerClient: &fakeDocker,
-		dockerPuller: &dockertools.FakeDockerPuller{},
 		cadvisor:     mockCadvisor,
 	}
 
@@ -1652,7 +1651,7 @@ func TestSyncPodsWithPullPolicy(t *testing.T) {
 	kubelet := testKubelet.kubelet
 	fakeDocker := testKubelet.fakeDocker
 	waitGroup := testKubelet.waitGroup
-	puller := kubelet.dockerPuller.(*dockertools.FakeDockerPuller)
+	puller := kubelet.containerManager.Puller.(*dockertools.FakeDockerPuller)
 	puller.HasImages = []string{"existing_one", "want:latest"}
 	kubelet.containerManager.PodInfraContainerImage = "custom_image_name"
 	fakeDocker.ContainerList = []docker.APIContainers{}

pkg/kubelet/runonce.go

@@ -53,9 +53,6 @@ func (kl *Kubelet) RunOnce(updates <-chan PodUpdate) ([]RunPodResult, error) {
 
 // runOnce runs a given set of pods and returns their status.
 func (kl *Kubelet) runOnce(pods []api.Pod, retryDelay time.Duration) (results []RunPodResult, err error) {
-	if kl.dockerPuller == nil {
-		kl.dockerPuller = dockertools.NewDockerPuller(kl.dockerClient, kl.pullQPS, kl.pullBurst)
-	}
 	kl.handleNotFittingPods(pods)
 
 	ch := make(chan RunPodResult)

pkg/kubelet/runonce_test.go

@@ -144,8 +144,9 @@ func TestRunOnce(t *testing.T) {
 		},
 		t: t,
 	}
-	kb.dockerPuller = &dockertools.FakeDockerPuller{}
-	kb.containerManager = dockertools.NewDockerManager(kb.dockerClient, kb.recorder, dockertools.PodInfraContainerImage)
+
+	kb.containerManager = dockertools.NewDockerManager(kb.dockerClient, kb.recorder, dockertools.PodInfraContainerImage, 0, 0)
+	kb.containerManager.Puller = &dockertools.FakeDockerPuller{}
 
 	pods := []api.Pod{
 		{