cleanup: fix golint errors in /pkg/kubelet/stats

hack/.golint_failures

@@ -108,7 +108,6 @@ pkg/kubelet/dockershim/network/testing
 pkg/kubelet/pluginmanager/pluginwatcher
 pkg/kubelet/pod/testing
 pkg/kubelet/preemption
-pkg/kubelet/stats
 pkg/kubelet/sysctl
 pkg/kubelet/types
 pkg/kubemark

pkg/kubelet/BUILD

@@ -145,6 +145,7 @@ go_library(
         "//staging/src/k8s.io/cri-api/pkg/apis:go_default_library",
         "//staging/src/k8s.io/cri-api/pkg/apis/runtime/v1alpha2:go_default_library",
         "//staging/src/k8s.io/kubelet/pkg/apis/pluginregistration/v1:go_default_library",
+        "//staging/src/k8s.io/kubelet/pkg/apis/stats/v1alpha1:go_default_library",
         "//staging/src/k8s.io/mount-utils:go_default_library",
         "//third_party/forked/golang/expansion:go_default_library",
         "//vendor/github.com/golang/groupcache/lru:go_default_library",

pkg/kubelet/kubelet.go

@@ -58,6 +58,7 @@ import (
 	internalapi "k8s.io/cri-api/pkg/apis"
 	"k8s.io/klog/v2"
 	pluginwatcherapi "k8s.io/kubelet/pkg/apis/pluginregistration/v1"
+	statsapi "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
 	api "k8s.io/kubernetes/pkg/apis/core"
 	"k8s.io/kubernetes/pkg/features"
 	kubeletconfiginternal "k8s.io/kubernetes/pkg/kubelet/apis/config"
@@ -1119,7 +1120,7 @@ type Kubelet struct {
 	dockerLegacyService legacy.DockerLegacyService
 
 	// StatsProvider provides the node and the container stats.
-	*stats.StatsProvider
+	StatsProvider *stats.Provider
 
 	// This flag, if set, instructs the kubelet to keep volumes from terminated pods mounted to the node.
 	// This can be useful for debugging volume related issues.
@@ -1136,6 +1137,56 @@ type Kubelet struct {
 	runtimeClassManager *runtimeclass.Manager
 }
 
+// ListPodStats is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) ListPodStats() ([]statsapi.PodStats, error) {
+	return kl.StatsProvider.ListPodStats()
+}
+
+// ListPodCPUAndMemoryStats is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) ListPodCPUAndMemoryStats() ([]statsapi.PodStats, error) {
+	return kl.StatsProvider.ListPodCPUAndMemoryStats()
+}
+
+// ListPodStatsAndUpdateCPUNanoCoreUsage is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) ListPodStatsAndUpdateCPUNanoCoreUsage() ([]statsapi.PodStats, error) {
+	return kl.StatsProvider.ListPodStatsAndUpdateCPUNanoCoreUsage()
+}
+
+// ImageFsStats is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) ImageFsStats() (*statsapi.FsStats, error) {
+	return kl.StatsProvider.ImageFsStats()
+}
+
+// GetCgroupStats is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) GetCgroupStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, *statsapi.NetworkStats, error) {
+	return kl.StatsProvider.GetCgroupStats(cgroupName, updateStats)
+}
+
+// GetCgroupCPUAndMemoryStats is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) GetCgroupCPUAndMemoryStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, error) {
+	return kl.StatsProvider.GetCgroupCPUAndMemoryStats(cgroupName, updateStats)
+}
+
+// RootFsStats is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) RootFsStats() (*statsapi.FsStats, error) {
+	return kl.StatsProvider.RootFsStats()
+}
+
+// GetContainerInfo is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) GetContainerInfo(podFullName string, uid types.UID, containerName string, req *cadvisorapi.ContainerInfoRequest) (*cadvisorapi.ContainerInfo, error) {
+	return kl.StatsProvider.GetContainerInfo(podFullName, uid, containerName, req)
+}
+
+// GetRawContainerInfo is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) GetRawContainerInfo(containerName string, req *cadvisorapi.ContainerInfoRequest, subcontainers bool) (map[string]*cadvisorapi.ContainerInfo, error) {
+	return kl.StatsProvider.GetRawContainerInfo(containerName, req, subcontainers)
+}
+
+// RlimitStats is delegated to StatsProvider, which implements stats.Provider interface
+func (kl *Kubelet) RlimitStats() (*statsapi.RlimitStats, error) {
+	return kl.StatsProvider.RlimitStats()
+}
+
 // setupDataDirs creates:
 // 1.  the root directory
 // 2.  the pods directory

pkg/kubelet/runonce_test.go

@@ -113,7 +113,7 @@ func TestRunOnce(t *testing.T) {
 		false, /* keepTerminatedPodVolumes */
 		volumetest.NewBlockVolumePathHandler())
 
-	// TODO: Factor out "StatsProvider" from Kubelet so we don't have a cyclic dependency
+	// TODO: Factor out "stats.Provider" from Kubelet so we don't have a cyclic dependency
 	volumeStatsAggPeriod := time.Second * 10
 	kb.resourceAnalyzer = stats.NewResourceAnalyzer(kb, volumeStatsAggPeriod)
 	nodeRef := &v1.ObjectReference{

pkg/kubelet/stats/BUILD

@@ -9,7 +9,7 @@ go_library(
         "cri_stats_provider_windows.go",
         "helper.go",
         "log_metrics_provider.go",
-        "stats_provider.go",
+        "provider.go",
     ],
     importpath = "k8s.io/kubernetes/pkg/kubelet/stats",
     visibility = ["//visibility:public"],
@@ -67,7 +67,7 @@ go_test(
         "cri_stats_provider_test.go",
         "helper_test.go",
         "log_metrics_provider_test.go",
-        "stats_provider_test.go",
+        "provider_test.go",
     ],
     embed = [":go_default_library"],
     deps = [

pkg/kubelet/stats/provider.go

@@ -32,7 +32,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/status"
 )
 
-// NewCRIStatsProvider returns a StatsProvider that provides the node stats
+// NewCRIStatsProvider returns a Provider that provides the node stats
 // from cAdvisor and the container stats from CRI.
 func NewCRIStatsProvider(
 	cadvisor cadvisor.Interface,
@@ -43,7 +43,7 @@ func NewCRIStatsProvider(
 	imageService internalapi.ImageManagerService,
 	logMetricsService LogMetricsService,
 	osInterface kubecontainer.OSInterface,
-) *StatsProvider {
+) *Provider {
 	return newStatsProvider(cadvisor, podManager, runtimeCache, newCRIStatsProvider(cadvisor, resourceAnalyzer,
 		runtimeService, imageService, logMetricsService, osInterface))
 }
@@ -57,19 +57,19 @@ func NewCadvisorStatsProvider(
 	runtimeCache kubecontainer.RuntimeCache,
 	imageService kubecontainer.ImageService,
 	statusProvider status.PodStatusProvider,
-) *StatsProvider {
+) *Provider {
 	return newStatsProvider(cadvisor, podManager, runtimeCache, newCadvisorStatsProvider(cadvisor, resourceAnalyzer, imageService, statusProvider))
 }
 
-// newStatsProvider returns a new StatsProvider that provides node stats from
+// newStatsProvider returns a new Provider that provides node stats from
 // cAdvisor and the container stats using the containerStatsProvider.
 func newStatsProvider(
 	cadvisor cadvisor.Interface,
 	podManager kubepod.Manager,
 	runtimeCache kubecontainer.RuntimeCache,
 	containerStatsProvider containerStatsProvider,
-) *StatsProvider {
+) *Provider {
-	return &StatsProvider{
+	return &Provider{
 		cadvisor:               cadvisor,
 		podManager:             podManager,
 		runtimeCache:           runtimeCache,
@@ -77,8 +77,8 @@ func newStatsProvider(
 	}
 }
 
-// StatsProvider provides the stats of the node and the pod-managed containers.
+// Provider provides the stats of the node and the pod-managed containers.
-type StatsProvider struct {
+type Provider struct {
 	cadvisor     cadvisor.Interface
 	podManager   kubepod.Manager
 	runtimeCache kubecontainer.RuntimeCache
@@ -101,13 +101,13 @@ type rlimitStatsProvider interface {
 }
 
 // RlimitStats returns base information about process count
-func (p *StatsProvider) RlimitStats() (*statsapi.RlimitStats, error) {
+func (p *Provider) RlimitStats() (*statsapi.RlimitStats, error) {
 	return pidlimit.Stats()
 }
 
 // GetCgroupStats returns the stats of the cgroup with the cgroupName. Note that
 // this function doesn't generate filesystem stats.
-func (p *StatsProvider) GetCgroupStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, *statsapi.NetworkStats, error) {
+func (p *Provider) GetCgroupStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, *statsapi.NetworkStats, error) {
 	info, err := getCgroupInfo(p.cadvisor, cgroupName, updateStats)
 	if err != nil {
 		return nil, nil, fmt.Errorf("failed to get cgroup stats for %q: %v", cgroupName, err)
@@ -120,7 +120,7 @@ func (p *StatsProvider) GetCgroupStats(cgroupName string, updateStats bool) (*st
 
 // GetCgroupCPUAndMemoryStats returns the CPU and memory stats of the cgroup with the cgroupName. Note that
 // this function doesn't generate filesystem stats.
-func (p *StatsProvider) GetCgroupCPUAndMemoryStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, error) {
+func (p *Provider) GetCgroupCPUAndMemoryStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, error) {
 	info, err := getCgroupInfo(p.cadvisor, cgroupName, updateStats)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get cgroup stats for %q: %v", cgroupName, err)
@@ -131,7 +131,7 @@ func (p *StatsProvider) GetCgroupCPUAndMemoryStats(cgroupName string, updateStat
 }
 
 // RootFsStats returns the stats of the node root filesystem.
-func (p *StatsProvider) RootFsStats() (*statsapi.FsStats, error) {
+func (p *Provider) RootFsStats() (*statsapi.FsStats, error) {
 	rootFsInfo, err := p.cadvisor.RootFsInfo()
 	if err != nil {
 		return nil, fmt.Errorf("failed to get rootFs info: %v", err)
@@ -162,7 +162,7 @@ func (p *StatsProvider) RootFsStats() (*statsapi.FsStats, error) {
 }
 
 // GetContainerInfo returns stats (from cAdvisor) for a container.
-func (p *StatsProvider) GetContainerInfo(podFullName string, podUID types.UID, containerName string, req *cadvisorapiv1.ContainerInfoRequest) (*cadvisorapiv1.ContainerInfo, error) {
+func (p *Provider) GetContainerInfo(podFullName string, podUID types.UID, containerName string, req *cadvisorapiv1.ContainerInfoRequest) (*cadvisorapiv1.ContainerInfo, error) {
 	// Resolve and type convert back again.
 	// We need the static pod UID but the kubecontainer API works with types.UID.
 	podUID = types.UID(p.podManager.TranslatePodUID(podUID))
@@ -186,7 +186,7 @@ func (p *StatsProvider) GetContainerInfo(podFullName string, podUID types.UID, c
 
 // GetRawContainerInfo returns the stats (from cadvisor) for a non-Kubernetes
 // container.
-func (p *StatsProvider) GetRawContainerInfo(containerName string, req *cadvisorapiv1.ContainerInfoRequest, subcontainers bool) (map[string]*cadvisorapiv1.ContainerInfo, error) {
+func (p *Provider) GetRawContainerInfo(containerName string, req *cadvisorapiv1.ContainerInfoRequest, subcontainers bool) (map[string]*cadvisorapiv1.ContainerInfo, error) {
 	if subcontainers {
 		return p.cadvisor.SubcontainerInfo(containerName, req)
 	}
@@ -200,7 +200,7 @@ func (p *StatsProvider) GetRawContainerInfo(containerName string, req *cadvisora
 }
 
 // HasDedicatedImageFs returns true if a dedicated image filesystem exists for storing images.
-func (p *StatsProvider) HasDedicatedImageFs() (bool, error) {
+func (p *Provider) HasDedicatedImageFs() (bool, error) {
 	device, err := p.containerStatsProvider.ImageFsDevice()
 	if err != nil {
 		return false, err