Merge pull request kubernetes#76442 from viegasdom/fix-golint-utils-bandwith

Fix golint failures of util/bandwith/*.go

Author: k8s-ci-robot

hack/.golint_failures

@@ -287,7 +287,6 @@ pkg/security/podsecuritypolicy/user
 pkg/security/podsecuritypolicy/util
 pkg/serviceaccount
 pkg/ssh
-pkg/util/bandwidth
 pkg/util/config
 pkg/util/ebtables
 pkg/util/env

pkg/kubelet/dockershim/network/kubenet/kubenet_linux.go

@@ -74,7 +74,7 @@ type kubenetNetworkPlugin struct {
 	netConfig       *libcni.NetworkConfig
 	loConfig        *libcni.NetworkConfig
 	cniConfig       libcni.CNI
-	bandwidthShaper bandwidth.BandwidthShaper
+	bandwidthShaper bandwidth.Shaper
 	mu              sync.Mutex //Mutex for protecting podIPs map, netConfig, and shaper initialization
 	podIPs          map[kubecontainer.ContainerID]string
 	mtu             int
@@ -597,7 +597,7 @@ func (plugin *kubenetNetworkPlugin) delContainerFromNetwork(config *libcni.Netwo
 // shaper retrieves the bandwidth shaper and, if it hasn't been fetched before,
 // initializes it and ensures the bridge is appropriately configured
 // This function should only be called while holding the `plugin.mu` lock
-func (plugin *kubenetNetworkPlugin) shaper() bandwidth.BandwidthShaper {
+func (plugin *kubenetNetworkPlugin) shaper() bandwidth.Shaper {
 	if plugin.bandwidthShaper == nil {
 		plugin.bandwidthShaper = bandwidth.NewTCShaper(BridgeName)
 		plugin.bandwidthShaper.ReconcileInterface()

pkg/util/bandwidth/fake_shaper.go

@@ -22,28 +22,35 @@ import (
 	"k8s.io/apimachinery/pkg/api/resource"
 )
 
+// FakeShaper provides an implementation of the bandwith.Shaper.
+// Beware this is implementation has no features besides Reset and GetCIDRs.
 type FakeShaper struct {
 	CIDRs      []string
 	ResetCIDRs []string
 }
 
+// Limit is not implemented
 func (f *FakeShaper) Limit(cidr string, egress, ingress *resource.Quantity) error {
 	return errors.New("unimplemented")
 }
 
+// Reset appends a particular CIDR to the set of ResetCIDRs being managed by this shaper
 func (f *FakeShaper) Reset(cidr string) error {
 	f.ResetCIDRs = append(f.ResetCIDRs, cidr)
 	return nil
 }
 
+// ReconcileInterface is not implemented
 func (f *FakeShaper) ReconcileInterface() error {
 	return errors.New("unimplemented")
 }
 
+// ReconcileCIDR is not implemented
 func (f *FakeShaper) ReconcileCIDR(cidr string, egress, ingress *resource.Quantity) error {
 	return errors.New("unimplemented")
 }
 
+// GetCIDRs returns the set of CIDRs that are being managed by this shaper
 func (f *FakeShaper) GetCIDRs() ([]string, error) {
 	return f.CIDRs, nil
 }

pkg/util/bandwidth/interfaces.go

@@ -18,7 +18,9 @@ package bandwidth
 
 import "k8s.io/apimachinery/pkg/api/resource"
 
-type BandwidthShaper interface {
+// Shaper is designed so that the shaper structs created
+// satisfy the Shaper interface.
+type Shaper interface {
 	// Limit the bandwidth for a particular CIDR on a particular interface
 	//   * ingress and egress are in bits/second
 	//   * cidr is expected to be a valid network CIDR (e.g. '1.2.3.4/32' or '10.20.0.1/16')

pkg/util/bandwidth/linux.go

@@ -33,7 +33,7 @@ import (
 	"k8s.io/klog"
 )
 
-// tcShaper provides an implementation of the BandwidthShaper interface on Linux using the 'tc' tool.
+// tcShaper provides an implementation of the Shaper interface on Linux using the 'tc' tool.
 // In general, using this requires that the caller posses the NET_CAP_ADMIN capability, though if you
 // do this within an container, it only requires the NS_CAPABLE capability for manipulations to that
 // container's network namespace.
@@ -44,7 +44,8 @@ type tcShaper struct {
 	iface string
 }
 
-func NewTCShaper(iface string) BandwidthShaper {
+// NewTCShaper makes a new tcShaper for the given interface
+func NewTCShaper(iface string) Shaper {
 	shaper := &tcShaper{
 		e:     exec.New(),
 		iface: iface,
@@ -157,10 +158,9 @@ func (t *tcShaper) findCIDRClass(cidr string) (classAndHandleList [][]string, fo
 			// filter parent 1: protocol ip pref 1 u32 fh 800::800 order 2048 key ht 800 bkt 0 flowid 1:1
 			if len(parts) != 19 {
 				return classAndHandleList, false, fmt.Errorf("unexpected output from tc: %s %d (%v)", filter, len(parts), parts)
-			} else {
-				resultTmp := []string{parts[18], parts[9]}
-				classAndHandleList = append(classAndHandleList, resultTmp)
 			}
+			resultTmp := []string{parts[18], parts[9]}
+			classAndHandleList = append(classAndHandleList, resultTmp)
 		}
 	}
 	if len(classAndHandleList) > 0 {

pkg/util/bandwidth/unsupported.go

@@ -27,7 +27,8 @@ import (
 type unsupportedShaper struct {
 }
 
-func NewTCShaper(iface string) BandwidthShaper {
+// NewTCShaper makes a new unsupportedShapper for the given interface
+func NewTCShaper(iface string) Shaper {
 	return &unsupportedShaper{}
 }
 

pkg/util/bandwidth/utils.go

@@ -35,6 +35,7 @@ func validateBandwidthIsReasonable(rsrc *resource.Quantity) error {
 	return nil
 }
 
+// ExtractPodBandwidthResources extracts the ingress and egress from the given pod annotations
 func ExtractPodBandwidthResources(podAnnotations map[string]string) (ingress, egress *resource.Quantity, err error) {
 	if podAnnotations == nil {
 		return nil, nil, nil