Fix lint on pkg/kubelet/server/...

hack/.golint_failures

@@ -212,10 +212,6 @@ pkg/kubelet/prober/testing
 pkg/kubelet/qos
 pkg/kubelet/remote
 pkg/kubelet/secret
-pkg/kubelet/server
-pkg/kubelet/server/portforward
-pkg/kubelet/server/stats
-pkg/kubelet/server/streaming
 pkg/kubelet/stats
 pkg/kubelet/status
 pkg/kubelet/status/testing

pkg/kubelet/dockershim/docker_streaming.go

@@ -107,7 +107,7 @@ func (ds *dockerService) ExecSync(_ context.Context, req *runtimeapi.ExecSyncReq
 // Exec prepares a streaming endpoint to execute a command in the container, and returns the address.
 func (ds *dockerService) Exec(_ context.Context, req *runtimeapi.ExecRequest) (*runtimeapi.ExecResponse, error) {
 	if ds.streamingServer == nil {
-		return nil, streaming.ErrorStreamingDisabled("exec")
+		return nil, streaming.NewErrorStreamingDisabled("exec")
 	}
 	_, err := checkContainerStatus(ds.client, req.ContainerId)
 	if err != nil {
@@ -119,7 +119,7 @@ func (ds *dockerService) Exec(_ context.Context, req *runtimeapi.ExecRequest) (*
 // Attach prepares a streaming endpoint to attach to a running container, and returns the address.
 func (ds *dockerService) Attach(_ context.Context, req *runtimeapi.AttachRequest) (*runtimeapi.AttachResponse, error) {
 	if ds.streamingServer == nil {
-		return nil, streaming.ErrorStreamingDisabled("attach")
+		return nil, streaming.NewErrorStreamingDisabled("attach")
 	}
 	_, err := checkContainerStatus(ds.client, req.ContainerId)
 	if err != nil {
@@ -131,7 +131,7 @@ func (ds *dockerService) Attach(_ context.Context, req *runtimeapi.AttachRequest
 // PortForward prepares a streaming endpoint to forward ports from a PodSandbox, and returns the address.
 func (ds *dockerService) PortForward(_ context.Context, req *runtimeapi.PortForwardRequest) (*runtimeapi.PortForwardResponse, error) {
 	if ds.streamingServer == nil {
-		return nil, streaming.ErrorStreamingDisabled("port forward")
+		return nil, streaming.NewErrorStreamingDisabled("port forward")
 	}
 	_, err := checkContainerStatus(ds.client, req.PodSandboxId)
 	if err != nil {

pkg/kubelet/metrics/collectors/volume_stats.go

@@ -59,11 +59,11 @@ var (
 )
 
 type volumeStatsCollector struct {
-	statsProvider serverstats.StatsProvider
+	statsProvider serverstats.Provider
 }
 
 // NewVolumeStatsCollector creates a volume stats prometheus collector.
-func NewVolumeStatsCollector(statsProvider serverstats.StatsProvider) prometheus.Collector {
+func NewVolumeStatsCollector(statsProvider serverstats.Provider) prometheus.Collector {
 	return &volumeStatsCollector{statsProvider: statsProvider}
 }
 

pkg/kubelet/server/auth.go

@@ -42,6 +42,7 @@ func NewKubeletAuth(authenticator authenticator.Request, authorizerAttributeGett
 	return &KubeletAuth{authenticator, authorizerAttributeGetter, authorizer}
 }
 
+// NewNodeAuthorizerAttributesGetter creates a new authorizer.RequestAttributesGetter for the node.
 func NewNodeAuthorizerAttributesGetter(nodeName types.NodeName) authorizer.RequestAttributesGetter {
 	return nodeAuthorizerAttributesGetter{nodeName: nodeName}
 }

pkg/kubelet/server/portforward/constants.go

@@ -14,10 +14,11 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// package portforward contains server-side logic for handling port forwarding requests.
+// Package portforward contains server-side logic for handling port forwarding requests.
 package portforward
 
-// The subprotocol "portforward.k8s.io" is used for port forwarding.
+// ProtocolV1Name is the name of the subprotocol used for port forwarding.
 const ProtocolV1Name = "portforward.k8s.io"
 
+// SupportedProtocols are the supported port forwarding protocols.
 var SupportedProtocols = []string{ProtocolV1Name}

pkg/kubelet/server/portforward/httpstream.go

@@ -33,7 +33,7 @@ import (
 	"k8s.io/klog"
 )
 
-func handleHttpStreams(req *http.Request, w http.ResponseWriter, portForwarder PortForwarder, podName string, uid types.UID, supportedPortForwardProtocols []string, idleTimeout, streamCreationTimeout time.Duration) error {
+func handleHTTPStreams(req *http.Request, w http.ResponseWriter, portForwarder PortForwarder, podName string, uid types.UID, supportedPortForwardProtocols []string, idleTimeout, streamCreationTimeout time.Duration) error {
 	_, err := httpstream.Handshake(req, w, supportedPortForwardProtocols)
 	// negotiated protocol isn't currently used server side, but could be in the future
 	if err != nil {

pkg/kubelet/server/portforward/httpstream_test.go

@@ -63,7 +63,7 @@ func TestHTTPStreamReceived(t *testing.T) {
 	for name, test := range tests {
 		streams := make(chan httpstream.Stream, 1)
 		f := httpStreamReceived(streams)
-		stream := newFakeHttpStream()
+		stream := newFakeHTTPStream()
 		if len(test.port) > 0 {
 			stream.headers.Set("port", test.port)
 		}
@@ -135,7 +135,7 @@ func TestGetStreamPair(t *testing.T) {
 	}
 
 	// removed via complete
-	dataStream := newFakeHttpStream()
+	dataStream := newFakeHTTPStream()
 	dataStream.headers.Set(api.StreamType, api.StreamTypeData)
 	complete, err := p.add(dataStream)
 	if err != nil {
@@ -145,7 +145,7 @@ func TestGetStreamPair(t *testing.T) {
 		t.Fatalf("unexpected complete")
 	}
 
-	errorStream := newFakeHttpStream()
+	errorStream := newFakeHTTPStream()
 	errorStream.headers.Set(api.StreamType, api.StreamTypeError)
 	complete, err = p.add(errorStream)
 	if err != nil {
@@ -188,7 +188,7 @@ func TestGetStreamPair(t *testing.T) {
 func TestRequestID(t *testing.T) {
 	h := &httpStreamHandler{}
 
-	s := newFakeHttpStream()
+	s := newFakeHTTPStream()
 	s.headers.Set(api.StreamType, api.StreamTypeError)
 	s.id = 1
 	if e, a := "1", h.requestID(s); e != a {
@@ -208,39 +208,39 @@ func TestRequestID(t *testing.T) {
 	}
 }
 
-type fakeHttpStream struct {
+type fakeHTTPStream struct {
 	headers http.Header
 	id      uint32
 }
 
-func newFakeHttpStream() *fakeHttpStream {
-	return &fakeHttpStream{
+func newFakeHTTPStream() *fakeHTTPStream {
+	return &fakeHTTPStream{
 		headers: make(http.Header),
 	}
 }
 
-var _ httpstream.Stream = &fakeHttpStream{}
+var _ httpstream.Stream = &fakeHTTPStream{}
 
-func (s *fakeHttpStream) Read(data []byte) (int, error) {
+func (s *fakeHTTPStream) Read(data []byte) (int, error) {
 	return 0, nil
 }
 
-func (s *fakeHttpStream) Write(data []byte) (int, error) {
+func (s *fakeHTTPStream) Write(data []byte) (int, error) {
 	return 0, nil
 }
 
-func (s *fakeHttpStream) Close() error {
+func (s *fakeHTTPStream) Close() error {
 	return nil
 }
 
-func (s *fakeHttpStream) Reset() error {
+func (s *fakeHTTPStream) Reset() error {
 	return nil
 }
 
-func (s *fakeHttpStream) Headers() http.Header {
+func (s *fakeHTTPStream) Headers() http.Header {
 	return s.headers
 }
 
-func (s *fakeHttpStream) Identifier() uint32 {
+func (s *fakeHTTPStream) Identifier() uint32 {
 	return s.id
 }

pkg/kubelet/server/portforward/portforward.go

@@ -43,7 +43,7 @@ func ServePortForward(w http.ResponseWriter, req *http.Request, portForwarder Po
 	if wsstream.IsWebSocketRequest(req) {
 		err = handleWebSocketStreams(req, w, portForwarder, podName, uid, portForwardOptions, supportedProtocols, idleTimeout, streamCreationTimeout)
 	} else {
-		err = handleHttpStreams(req, w, portForwarder, podName, uid, supportedProtocols, idleTimeout, streamCreationTimeout)
+		err = handleHTTPStreams(req, w, portForwarder, podName, uid, supportedProtocols, idleTimeout, streamCreationTimeout)
 	}
 
 	if err != nil {

pkg/kubelet/server/portforward/websocket.go

@@ -43,15 +43,15 @@ const (
 	v4Base64WebsocketProtocol = "v4." + wsstream.Base64ChannelWebSocketProtocol
 )
 
-// options contains details about which streams are required for
-// port forwarding.
+// V4Options contains details about which streams are required for port
+// forwarding.
 // All fields included in V4Options need to be expressed explicitly in the
 // CRI (pkg/kubelet/apis/cri/{version}/api.proto) PortForwardRequest.
 type V4Options struct {
 	Ports []int32
 }
 
-// newOptions creates a new options from the Request.
+// NewV4Options creates a new options from the Request.
 func NewV4Options(req *http.Request) (*V4Options, error) {
 	if !wsstream.IsWebSocketRequest(req) {
 		return &V4Options{}, nil

pkg/kubelet/server/server.go

@@ -88,6 +88,7 @@ type Server struct {
 	redirectContainerStreaming bool
 }
 
+// TLSOptions holds the TLS options.
 type TLSOptions struct {
 	Config   *tls.Config
 	CertFile string
@@ -165,7 +166,7 @@ func ListenAndServeKubeletReadOnlyServer(host HostInterface, resourceAnalyzer st
 	klog.Fatal(server.ListenAndServe())
 }
 
-// ListenAndServePodResources initializes a grpc server to serve the PodResources service
+// ListenAndServePodResources initializes a gRPC server to serve the PodResources service
 func ListenAndServePodResources(socket string, podsProvider podresources.PodsProvider, devicesProvider podresources.DevicesProvider) {
 	server := grpc.NewServer()
 	podresourcesapi.RegisterPodResourcesListerServer(server, podresources.NewPodResourcesServer(podsProvider, devicesProvider))
@@ -186,7 +187,7 @@ type AuthInterface interface {
 // HostInterface contains all the kubelet methods required by the server.
 // For testability.
 type HostInterface interface {
-	stats.StatsProvider
+	stats.Provider
 	GetVersionInfo() (*cadvisorapi.VersionInfo, error)
 	GetCachedMachineInfo() (*cadvisorapi.MachineInfo, error)
 	GetRunningPods() ([]*v1.Pod, error)
@@ -533,7 +534,7 @@ func (s *Server) getContainerLogs(request *restful.Request, response *restful.Re
 
 	pod, ok := s.host.GetPodByName(podNamespace, podID)
 	if !ok {
-		response.WriteError(http.StatusNotFound, fmt.Errorf("pod %q does not exist\n", podID))
+		response.WriteError(http.StatusNotFound, fmt.Errorf("pod %q does not exist", podID))
 		return
 	}
 	// Check if containerName is valid.
@@ -553,12 +554,12 @@ func (s *Server) getContainerLogs(request *restful.Request, response *restful.Re
 		}
 	}
 	if !containerExists {
-		response.WriteError(http.StatusNotFound, fmt.Errorf("container %q not found in pod %q\n", containerName, podID))
+		response.WriteError(http.StatusNotFound, fmt.Errorf("container %q not found in pod %q", containerName, podID))
 		return
 	}
 
 	if _, ok := response.ResponseWriter.(http.Flusher); !ok {
-		response.WriteError(http.StatusInternalServerError, fmt.Errorf("unable to convert %v into http.Flusher, cannot show logs\n", reflect.TypeOf(response)))
+		response.WriteError(http.StatusInternalServerError, fmt.Errorf("unable to convert %v into http.Flusher, cannot show logs", reflect.TypeOf(response)))
 		return
 	}
 	fw := flushwriter.Wrap(response.ResponseWriter)
@@ -591,7 +592,7 @@ func (s *Server) getPods(request *restful.Request, response *restful.Response) {
 		response.WriteError(http.StatusInternalServerError, err)
 		return
 	}
-	writeJsonResponse(response, data)
+	writeJSONResponse(response, data)
 }
 
 // getRunningPods returns a list of pods running on Kubelet. The list is
@@ -608,7 +609,7 @@ func (s *Server) getRunningPods(request *restful.Request, response *restful.Resp
 		response.WriteError(http.StatusInternalServerError, err)
 		return
 	}
-	writeJsonResponse(response, data)
+	writeJSONResponse(response, data)
 }
 
 // getLogs handles logs requests against the Kubelet.
@@ -747,11 +748,11 @@ func (s *Server) getRun(request *restful.Request, response *restful.Response) {
 		response.WriteError(http.StatusInternalServerError, err)
 		return
 	}
-	writeJsonResponse(response, data)
+	writeJSONResponse(response, data)
 }
 
 // Derived from go-restful writeJSON.
-func writeJsonResponse(response *restful.Response, data []byte) {
+func writeJSONResponse(response *restful.Response, data []byte) {
 	if data == nil {
 		response.WriteHeader(http.StatusOK)
 		// do not write a nil representation
@@ -834,7 +835,7 @@ func (a prometheusHostAdapter) GetMachineInfo() (*cadvisorapi.MachineInfo, error
 	return a.host.GetCachedMachineInfo()
 }
 
-func containerPrometheusLabelsFunc(s stats.StatsProvider) metrics.ContainerLabelsFunc {
+func containerPrometheusLabelsFunc(s stats.Provider) metrics.ContainerLabelsFunc {
 	// containerPrometheusLabels maps cAdvisor labels to prometheus labels.
 	return func(c *cadvisorapi.ContainerInfo) map[string]string {
 		// Prometheus requires that all metrics in the same family have the same labels,

pkg/kubelet/server/server_test.go

@@ -115,7 +115,7 @@ func (fk *fakeKubelet) GetCachedMachineInfo() (*cadvisorapi.MachineInfo, error)
 	return fk.machineInfoFunc()
 }
 
-func (_ *fakeKubelet) GetVersionInfo() (*cadvisorapi.VersionInfo, error) {
+func (*fakeKubelet) GetVersionInfo() (*cadvisorapi.VersionInfo, error) {
 	return &cadvisorapi.VersionInfo{}, nil
 }
 
@@ -249,23 +249,23 @@ func (fk *fakeKubelet) GetPortForward(podName, podNamespace string, podUID types
 }
 
 // Unused functions
-func (_ *fakeKubelet) GetNode() (*v1.Node, error)                       { return nil, nil }
-func (_ *fakeKubelet) GetNodeConfig() cm.NodeConfig                     { return cm.NodeConfig{} }
-func (_ *fakeKubelet) GetPodCgroupRoot() string                         { return "" }
-func (_ *fakeKubelet) GetPodByCgroupfs(cgroupfs string) (*v1.Pod, bool) { return nil, false }
+func (*fakeKubelet) GetNode() (*v1.Node, error)                       { return nil, nil }
+func (*fakeKubelet) GetNodeConfig() cm.NodeConfig                     { return cm.NodeConfig{} }
+func (*fakeKubelet) GetPodCgroupRoot() string                         { return "" }
+func (*fakeKubelet) GetPodByCgroupfs(cgroupfs string) (*v1.Pod, bool) { return nil, false }
 func (fk *fakeKubelet) ListVolumesForPod(podUID types.UID) (map[string]volume.Volume, bool) {
 	return map[string]volume.Volume{}, true
 }
 
-func (_ *fakeKubelet) RootFsStats() (*statsapi.FsStats, error)                { return nil, nil }
-func (_ *fakeKubelet) ListPodStats() ([]statsapi.PodStats, error)             { return nil, nil }
-func (_ *fakeKubelet) ListPodCPUAndMemoryStats() ([]statsapi.PodStats, error) { return nil, nil }
-func (_ *fakeKubelet) ImageFsStats() (*statsapi.FsStats, error)               { return nil, nil }
-func (_ *fakeKubelet) RlimitStats() (*statsapi.RlimitStats, error)            { return nil, nil }
-func (_ *fakeKubelet) GetCgroupStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, *statsapi.NetworkStats, error) {
+func (*fakeKubelet) RootFsStats() (*statsapi.FsStats, error)                { return nil, nil }
+func (*fakeKubelet) ListPodStats() ([]statsapi.PodStats, error)             { return nil, nil }
+func (*fakeKubelet) ListPodCPUAndMemoryStats() ([]statsapi.PodStats, error) { return nil, nil }
+func (*fakeKubelet) ImageFsStats() (*statsapi.FsStats, error)               { return nil, nil }
+func (*fakeKubelet) RlimitStats() (*statsapi.RlimitStats, error)            { return nil, nil }
+func (*fakeKubelet) GetCgroupStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, *statsapi.NetworkStats, error) {
 	return nil, nil, nil
 }
-func (_ *fakeKubelet) GetCgroupCPUAndMemoryStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, error) {
+func (*fakeKubelet) GetCgroupCPUAndMemoryStats(cgroupName string, updateStats bool) (*statsapi.ContainerStats, error) {
 	return nil, nil
 }
 
@@ -744,7 +744,7 @@ func TestAuthFilters(t *testing.T) {
 The kubelet API has likely registered a handler for a new path.
 If the new path has a use case for partitioned authorization when requested from the kubelet API,
 add a specific subresource for it in auth.go#GetRequestAttributes() and in TestAuthFilters().
-Otherwise, add it to the expected list of paths that map to the "proxy" subresource in TestAuthFilters().`, path))
+Otherwise, add it to the expected list of paths that map to the "proxy" subresource in TestAuthFilters()`, path))
 		}
 	}
 	attributesGetter := NewNodeAuthorizerAttributesGetter(types.NodeName("test"))
@@ -1553,9 +1553,8 @@ func TestServePortForward(t *testing.T) {
 			if test.redirect {
 				assert.Equal(t, http.StatusFound, resp.StatusCode, "status code")
 				return
-			} else {
-				assert.Equal(t, http.StatusSwitchingProtocols, resp.StatusCode, "status code")
 			}
+			assert.Equal(t, http.StatusSwitchingProtocols, resp.StatusCode, "status code")
 
 			conn, err := upgradeRoundTripper.NewConnection(resp)
 			require.NoError(t, err, "creating streaming connection")

pkg/kubelet/server/stats/fs_resource_analyzer.go

@@ -27,9 +27,7 @@ import (
 	"k8s.io/klog"
 )
 
-// Map to PodVolumeStats pointers since the addresses for map values are not constant and can cause pain
-// if we need ever to get a pointer to one of the values (e.g. you can't)
-type Cache map[types.UID]*volumeStatCalculator
+type statCache map[types.UID]*volumeStatCalculator
 
 // fsResourceAnalyzerInterface is for embedding fs functions into ResourceAnalyzer
 type fsResourceAnalyzerInterface interface {
@@ -38,7 +36,7 @@ type fsResourceAnalyzerInterface interface {
 
 // fsResourceAnalyzer provides stats about fs resource usage
 type fsResourceAnalyzer struct {
-	statsProvider     StatsProvider
+	statsProvider     Provider
 	calcPeriod        time.Duration
 	cachedVolumeStats atomic.Value
 	startOnce         sync.Once
@@ -47,12 +45,12 @@ type fsResourceAnalyzer struct {
 var _ fsResourceAnalyzerInterface = &fsResourceAnalyzer{}
 
 // newFsResourceAnalyzer returns a new fsResourceAnalyzer implementation
-func newFsResourceAnalyzer(statsProvider StatsProvider, calcVolumePeriod time.Duration) *fsResourceAnalyzer {
+func newFsResourceAnalyzer(statsProvider Provider, calcVolumePeriod time.Duration) *fsResourceAnalyzer {
 	r := &fsResourceAnalyzer{
 		statsProvider: statsProvider,
 		calcPeriod:    calcVolumePeriod,
 	}
-	r.cachedVolumeStats.Store(make(Cache))
+	r.cachedVolumeStats.Store(make(statCache))
 	return r
 }
 
@@ -70,8 +68,8 @@ func (s *fsResourceAnalyzer) Start() {
 
 // updateCachedPodVolumeStats calculates and caches the PodVolumeStats for every Pod known to the kubelet.
 func (s *fsResourceAnalyzer) updateCachedPodVolumeStats() {
-	oldCache := s.cachedVolumeStats.Load().(Cache)
-	newCache := make(Cache)
+	oldCache := s.cachedVolumeStats.Load().(statCache)
+	newCache := make(statCache)
 
 	// Copy existing entries to new map, creating/starting new entries for pods missing from the cache
 	for _, pod := range s.statsProvider.GetPods() {
@@ -96,12 +94,12 @@ func (s *fsResourceAnalyzer) updateCachedPodVolumeStats() {
 // GetPodVolumeStats returns the PodVolumeStats for a given pod.  Results are looked up from a cache that
 // is eagerly populated in the background, and never calculated on the fly.
 func (s *fsResourceAnalyzer) GetPodVolumeStats(uid types.UID) (PodVolumeStats, bool) {
-	cache := s.cachedVolumeStats.Load().(Cache)
-	if statCalc, found := cache[uid]; !found {
+	cache := s.cachedVolumeStats.Load().(statCache)
+	statCalc, found := cache[uid]
+	if !found {
 		// TODO: Differentiate between stats being empty
 		// See issue #20679
 		return PodVolumeStats{}, false
-	} else {
-		return statCalc.GetLatest()
 	}
+	return statCalc.GetLatest()
 }

pkg/kubelet/server/stats/handler.go

@@ -37,8 +37,8 @@ import (
 	"k8s.io/kubernetes/pkg/volume"
 )
 
-// Host methods required by stats handlers.
-type StatsProvider interface {
+// Provider hosts methods required by stats handlers.
+type Provider interface {
 	// The following stats are provided by either CRI or cAdvisor.
 	//
 	// ListPodStats returns the stats of all the containers managed by pods.
@@ -96,11 +96,12 @@ type StatsProvider interface {
 }
 
 type handler struct {
-	provider        StatsProvider
+	provider        Provider
 	summaryProvider SummaryProvider
 }
 
-func CreateHandlers(rootPath string, provider StatsProvider, summaryProvider SummaryProvider) *restful.WebService {
+// CreateHandlers creates the REST handlers for the stats.
+func CreateHandlers(rootPath string, provider Provider, summaryProvider SummaryProvider) *restful.WebService {
 	h := &handler{provider, summaryProvider}
 
 	ws := &restful.WebService{}
@@ -130,7 +131,7 @@ func CreateHandlers(rootPath string, provider StatsProvider, summaryProvider Sum
 	return ws
 }
 
-type StatsRequest struct {
+type statsRequest struct {
 	// The name of the container for which to request stats.
 	// Default: /
 	// +optional
@@ -158,7 +159,7 @@ type StatsRequest struct {
 	Subcontainers bool `json:"subcontainers,omitempty"`
 }
 
-func (r *StatsRequest) cadvisorRequest() *cadvisorapi.ContainerInfoRequest {
+func (r *statsRequest) cadvisorRequest() *cadvisorapi.ContainerInfoRequest {
 	return &cadvisorapi.ContainerInfoRequest{
 		NumStats: r.NumStats,
 		Start:    r.Start,
@@ -166,9 +167,9 @@ func (r *StatsRequest) cadvisorRequest() *cadvisorapi.ContainerInfoRequest {
 	}
 }
 
-func parseStatsRequest(request *restful.Request) (StatsRequest, error) {
+func parseStatsRequest(request *restful.Request) (statsRequest, error) {
 	// Default request.
-	query := StatsRequest{
+	query := statsRequest{
 		NumStats: 60,
 	}
 

pkg/kubelet/server/stats/resource_analyzer.go

@@ -37,7 +37,7 @@ type resourceAnalyzer struct {
 var _ ResourceAnalyzer = &resourceAnalyzer{}
 
 // NewResourceAnalyzer returns a new ResourceAnalyzer
-func NewResourceAnalyzer(statsProvider StatsProvider, calVolumeFrequency time.Duration) ResourceAnalyzer {
+func NewResourceAnalyzer(statsProvider Provider, calVolumeFrequency time.Duration) ResourceAnalyzer {
 	fsAnalyzer := newFsResourceAnalyzer(statsProvider, calVolumeFrequency)
 	summaryProvider := NewSummaryProvider(statsProvider)
 	return &resourceAnalyzer{fsAnalyzer, summaryProvider}

pkg/kubelet/server/stats/summary.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/kubernetes/pkg/kubelet/util"
 )
 
+// SummaryProvider provides summaries of the stats from Kubelet.
 type SummaryProvider interface {
 	// Get provides a new Summary with the stats from Kubelet,
 	// and will update some stats if updateStats is true
@@ -41,14 +42,14 @@ type summaryProviderImpl struct {
 	// systemBootTime is the time at which the system was started
 	systemBootTime metav1.Time
 
-	provider StatsProvider
+	provider Provider
 }
 
 var _ SummaryProvider = &summaryProviderImpl{}
 
 // NewSummaryProvider returns a SummaryProvider using the stats provided by the
 // specified statsProvider.
-func NewSummaryProvider(statsProvider StatsProvider) SummaryProvider {
+func NewSummaryProvider(statsProvider Provider) SummaryProvider {
 	kubeletCreationTime := metav1.Now()
 	bootTime, err := util.GetBootTime()
 	if err != nil {

pkg/kubelet/server/stats/volume_stat_calculator.go

@@ -32,7 +32,7 @@ import (
 
 // volumeStatCalculator calculates volume metrics for a given pod periodically in the background and caches the result
 type volumeStatCalculator struct {
-	statsProvider StatsProvider
+	statsProvider Provider
 	jitterPeriod  time.Duration
 	pod           *v1.Pod
 	stopChannel   chan struct{}
@@ -49,7 +49,7 @@ type PodVolumeStats struct {
 }
 
 // newVolumeStatCalculator creates a new VolumeStatCalculator
-func newVolumeStatCalculator(statsProvider StatsProvider, jitterPeriod time.Duration, pod *v1.Pod) *volumeStatCalculator {
+func newVolumeStatCalculator(statsProvider Provider, jitterPeriod time.Duration, pod *v1.Pod) *volumeStatCalculator {
 	return &volumeStatCalculator{
 		statsProvider: statsProvider,
 		jitterPeriod:  jitterPeriod,
@@ -79,11 +79,11 @@ func (s *volumeStatCalculator) StopOnce() *volumeStatCalculator {
 
 // getLatest returns the most recent PodVolumeStats from the cache
 func (s *volumeStatCalculator) GetLatest() (PodVolumeStats, bool) {
-	if result := s.latest.Load(); result == nil {
+	result := s.latest.Load()
+	if result == nil {
 		return PodVolumeStats{}, false
-	} else {
-		return result.(PodVolumeStats), true
 	}
+	return result.(PodVolumeStats), true
 }
 
 // calcAndStoreStats calculates PodVolumeStats for a given pod and writes the result to the s.latest cache.
@@ -102,8 +102,8 @@ func (s *volumeStatCalculator) calcAndStoreStats() {
 	}
 
 	// Call GetMetrics on each Volume and copy the result to a new VolumeStats.FsStats
-	ephemeralStats := []stats.VolumeStats{}
-	persistentStats := []stats.VolumeStats{}
+	var ephemeralStats []stats.VolumeStats
+	var persistentStats []stats.VolumeStats
 	for name, v := range volumes {
 		metric, err := v.GetMetrics()
 		if err != nil {

pkg/kubelet/server/streaming/errors.go

@@ -17,7 +17,6 @@ limitations under the License.
 package streaming
 
 import (
-	"fmt"
 	"net/http"
 	"strconv"
 
@@ -26,16 +25,17 @@ import (
 	"google.golang.org/grpc/status"
 )
 
-func ErrorStreamingDisabled(method string) error {
-	return status.Errorf(codes.NotFound, fmt.Sprintf("streaming method %s disabled", method))
+// NewErrorStreamingDisabled creates an error for disabled streaming method.
+func NewErrorStreamingDisabled(method string) error {
+	return status.Errorf(codes.NotFound, "streaming method %s disabled", method)
 }
 
-// The error returned when the maximum number of in-flight requests is exceeded.
-func ErrorTooManyInFlight() error {
-	return status.Errorf(codes.ResourceExhausted, "maximum number of in-flight requests exceeded")
+// NewErrorTooManyInFlight creates an error for exceeding the maximum number of in-flight requests.
+func NewErrorTooManyInFlight() error {
+	return status.Error(codes.ResourceExhausted, "maximum number of in-flight requests exceeded")
 }
 
-// Translates a CRI streaming error into an appropriate HTTP response.
+// WriteError translates a CRI streaming error into an appropriate HTTP response.
 func WriteError(err error, w http.ResponseWriter) error {
 	var status int
 	switch grpc.Code(err) {
@@ -43,9 +43,9 @@ func WriteError(err error, w http.ResponseWriter) error {
 		status = http.StatusNotFound
 	case codes.ResourceExhausted:
 		// We only expect to hit this if there is a DoS, so we just wait the full TTL.
-		// If this is ever hit in steady-state operations, consider increasing the MaxInFlight requests,
+		// If this is ever hit in steady-state operations, consider increasing the maxInFlight requests,
 		// or plumbing through the time to next expiration.
-		w.Header().Set("Retry-After", strconv.Itoa(int(CacheTTL.Seconds())))
+		w.Header().Set("Retry-After", strconv.Itoa(int(cacheTTL.Seconds())))
 		status = http.StatusTooManyRequests
 	default:
 		status = http.StatusInternalServerError

pkg/kubelet/server/streaming/request_cache.go

@@ -29,12 +29,12 @@ import (
 )
 
 var (
-	// Timeout after which tokens become invalid.
-	CacheTTL = 1 * time.Minute
-	// The maximum number of in-flight requests to allow.
-	MaxInFlight = 1000
-	// Length of the random base64 encoded token identifying the request.
-	TokenLen = 8
+	// cacheTTL is the timeout after which tokens become invalid.
+	cacheTTL = 1 * time.Minute
+	// maxInFlight is the maximum number of in-flight requests to allow.
+	maxInFlight = 1000
+	// tokenLen is the length of the random base64 encoded token identifying the request.
+	tokenLen = 8
 )
 
 // requestCache caches streaming (exec/attach/port-forward) requests and generates a single-use
@@ -77,14 +77,14 @@ func (c *requestCache) Insert(req request) (token string, err error) {
 	// Remove expired entries.
 	c.gc()
 	// If the cache is full, reject the request.
-	if c.ll.Len() == MaxInFlight {
-		return "", ErrorTooManyInFlight()
+	if c.ll.Len() == maxInFlight {
+		return "", NewErrorTooManyInFlight()
 	}
 	token, err = c.uniqueToken()
 	if err != nil {
 		return "", err
 	}
-	ele := c.ll.PushFront(&cacheEntry{token, req, c.clock.Now().Add(CacheTTL)})
+	ele := c.ll.PushFront(&cacheEntry{token, req, c.clock.Now().Add(cacheTTL)})
 
 	c.tokens[token] = ele
 	return token, nil
@@ -112,15 +112,15 @@ func (c *requestCache) Consume(token string) (req request, found bool) {
 // uniqueToken generates a random URL-safe token and ensures uniqueness.
 func (c *requestCache) uniqueToken() (string, error) {
 	const maxTries = 10
-	// Number of bytes to be TokenLen when base64 encoded.
-	tokenSize := math.Ceil(float64(TokenLen) * 6 / 8)
+	// Number of bytes to be tokenLen when base64 encoded.
+	tokenSize := math.Ceil(float64(tokenLen) * 6 / 8)
 	rawToken := make([]byte, int(tokenSize))
 	for i := 0; i < maxTries; i++ {
 		if _, err := rand.Read(rawToken); err != nil {
 			return "", err
 		}
 		encoded := base64.RawURLEncoding.EncodeToString(rawToken)
-		token := encoded[:TokenLen]
+		token := encoded[:tokenLen]
 		// If it's unique, return it. Otherwise retry.
 		if _, exists := c.tokens[encoded]; !exists {
 			return token, nil

pkg/kubelet/server/streaming/request_cache_test.go

@@ -35,22 +35,22 @@ func TestInsert(t *testing.T) {
 	// Insert normal
 	oldestTok, err := c.Insert(nextRequest())
 	require.NoError(t, err)
-	assert.Len(t, oldestTok, TokenLen)
+	assert.Len(t, oldestTok, tokenLen)
 	assertCacheSize(t, c, 1)
 
 	// Insert until full
-	for i := 0; i < MaxInFlight-2; i++ {
+	for i := 0; i < maxInFlight-2; i++ {
 		tok, err := c.Insert(nextRequest())
 		require.NoError(t, err)
-		assert.Len(t, tok, TokenLen)
+		assert.Len(t, tok, tokenLen)
 	}
-	assertCacheSize(t, c, MaxInFlight-1)
+	assertCacheSize(t, c, maxInFlight-1)
 
 	newestReq := nextRequest()
 	newestTok, err := c.Insert(newestReq)
 	require.NoError(t, err)
-	assert.Len(t, newestTok, TokenLen)
-	assertCacheSize(t, c, MaxInFlight)
+	assert.Len(t, newestTok, tokenLen)
+	assertCacheSize(t, c, maxInFlight)
 	require.Contains(t, c.tokens, oldestTok, "oldest request should still be cached")
 
 	// Consume newest token.
@@ -62,8 +62,8 @@ func TestInsert(t *testing.T) {
 	// Insert again (still full)
 	tok, err := c.Insert(nextRequest())
 	require.NoError(t, err)
-	assert.Len(t, tok, TokenLen)
-	assertCacheSize(t, c, MaxInFlight)
+	assert.Len(t, tok, tokenLen)
+	assertCacheSize(t, c, maxInFlight)
 
 	// Insert again (should evict)
 	_, err = c.Insert(nextRequest())
@@ -71,9 +71,9 @@ func TestInsert(t *testing.T) {
 	errResponse := httptest.NewRecorder()
 	require.NoError(t, WriteError(err, errResponse))
 	assert.Equal(t, errResponse.Code, http.StatusTooManyRequests)
-	assert.Equal(t, strconv.Itoa(int(CacheTTL.Seconds())), errResponse.HeaderMap.Get("Retry-After"))
+	assert.Equal(t, strconv.Itoa(int(cacheTTL.Seconds())), errResponse.HeaderMap.Get("Retry-After"))
 
-	assertCacheSize(t, c, MaxInFlight)
+	assertCacheSize(t, c, maxInFlight)
 	_, ok = c.Consume(oldestTok)
 	assert.True(t, ok, "oldest request should be valid")
 }
@@ -142,7 +142,7 @@ func TestConsume(t *testing.T) {
 		require.NoError(t, err)
 		assertCacheSize(t, c, 1)
 
-		clock.Step(2 * CacheTTL)
+		clock.Step(2 * cacheTTL)
 
 		_, ok := c.Consume(tok)
 		assert.False(t, ok)
@@ -167,7 +167,7 @@ func TestGC(t *testing.T) {
 
 	// expired: tok1, tok2
 	// non-expired: tok3, tok4
-	clock.Step(2 * CacheTTL)
+	clock.Step(2 * cacheTTL)
 	tok3, err := c.Insert(nextRequest())
 	require.NoError(t, err)
 	assertCacheSize(t, c, 1)
@@ -186,14 +186,14 @@ func TestGC(t *testing.T) {
 	assert.True(t, ok)
 
 	// When full, nothing is expired.
-	for i := 0; i < MaxInFlight; i++ {
+	for i := 0; i < maxInFlight; i++ {
 		_, err := c.Insert(nextRequest())
 		require.NoError(t, err)
 	}
-	assertCacheSize(t, c, MaxInFlight)
+	assertCacheSize(t, c, maxInFlight)
 
 	// When everything is expired
-	clock.Step(2 * CacheTTL)
+	clock.Step(2 * cacheTTL)
 	_, err = c.Insert(nextRequest())
 	require.NoError(t, err)
 	assertCacheSize(t, c, 1)

pkg/kubelet/server/streaming/server.go

@@ -39,7 +39,7 @@ import (
 	remotecommandserver "k8s.io/kubernetes/pkg/kubelet/server/remotecommand"
 )
 
-// The library interface to serve the stream requests.
+// Server is the library interface to serve the stream requests.
 type Server interface {
 	http.Handler
 
@@ -59,7 +59,7 @@ type Server interface {
 	Stop() error
 }
 
-// The interface to execute the commands and provide the streams.
+// Runtime is the interface to execute the commands and provide the streams.
 type Runtime interface {
 	Exec(containerID string, cmd []string, in io.Reader, out, err io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize) error
 	Attach(containerID string, in io.Reader, out, err io.WriteCloser, tty bool, resize <-chan remotecommand.TerminalSize) error
@@ -103,6 +103,7 @@ var DefaultConfig = Config{
 	SupportedPortForwardProtocols:   portforward.SupportedProtocols,
 }
 
+// NewServer creates a new Server for stream requests.
 // TODO(tallclair): Add auth(n/z) interface & handling.
 func NewServer(config Config, runtime Runtime) (Server, error) {
 	s := &server{
@@ -243,9 +244,8 @@ func (s *server) Start(stayUp bool) error {
 	s.config.BaseURL.Host = listener.Addr().String()
 	if s.config.TLSConfig != nil {
 		return s.server.ServeTLS(listener, "", "") // Use certs from TLSConfig.
-	} else {
-		return s.server.Serve(listener)
 	}
+	return s.server.Serve(listener)
 }
 
 func (s *server) Stop() error {