Fix/del error fix

go.mod

@@ -17,8 +17,8 @@ require (
 	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 // indirect
 	golang.org/x/net v0.0.0-20200226121028-0de0cce0169b
 	google.golang.org/grpc v1.23.0
-	gopkg.in/yaml.v2 v2.2.8 // indirect
 	gopkg.in/natefinch/lumberjack.v2 v2.0.0
+	gopkg.in/yaml.v2 v2.2.8 // indirect
 	k8s.io/api v0.0.0-20181115043458-b799cb063522
 	k8s.io/apimachinery v0.0.0-20181110190943-2a7c93004028
 	k8s.io/client-go v0.0.0-20181115111358-9bea17718df8

go.sum

@@ -1,4 +1,5 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/Microsoft/go-winio v0.4.11/go.mod h1:VhR8bwka0BXejwEJY73c50VrPtXAaKcyvVC4A4RozmA=
@@ -244,6 +245,8 @@ gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKW
 gopkg.in/inf.v0 v0.9.0 h1:3zYtXIO92bvsdS3ggAdA8Gb4Azj0YU+TVY1uGYNFA8o=
 gopkg.in/inf.v0 v0.9.0/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/mgo.v2 v2.0.0-20180705113604-9856a29383ce/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA=
+gopkg.in/natefinch/lumberjack.v2 v2.0.0 h1:1Lc07Kr7qY4U2YPouBjpCLxpiyxIVoxqXgkXLknAOE8=
+gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

k8sclient/k8sclient.go

@@ -37,12 +37,12 @@ import (
 	"github.com/containernetworking/cni/libcni"
 	"github.com/containernetworking/cni/pkg/skel"
 	cnitypes "github.com/containernetworking/cni/pkg/types"
-	"gopkg.in/intel/multus-cni.v3/kubeletclient"
-	"gopkg.in/intel/multus-cni.v3/logging"
-	"gopkg.in/intel/multus-cni.v3/types"
 	nettypes "github.com/k8snetworkplumbingwg/network-attachment-definition-client/pkg/apis/k8s.cni.cncf.io/v1"
 	netclient "github.com/k8snetworkplumbingwg/network-attachment-definition-client/pkg/client/clientset/versioned/typed/k8s.cni.cncf.io/v1"
 	netutils "github.com/k8snetworkplumbingwg/network-attachment-definition-client/pkg/utils"
+	"gopkg.in/intel/multus-cni.v3/kubeletclient"
+	"gopkg.in/intel/multus-cni.v3/logging"
+	"gopkg.in/intel/multus-cni.v3/types"
 )
 
 const (

kubeletclient/kubeletclient.go

@@ -5,10 +5,10 @@ import (
 	"path/filepath"
 	"time"
 
+	"golang.org/x/net/context"
 	"gopkg.in/intel/multus-cni.v3/checkpoint"
 	"gopkg.in/intel/multus-cni.v3/logging"
 	"gopkg.in/intel/multus-cni.v3/types"
-	"golang.org/x/net/context"
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/kubernetes/pkg/kubelet/apis/podresources"
 	podresourcesapi "k8s.io/kubernetes/pkg/kubelet/apis/podresources/v1alpha1"

multus/multus.go

@@ -701,11 +701,33 @@ func cmdDel(args *skel.CmdArgs, exec invoke.Exec, kubeClient *k8s.ClientInfo) er
 		}
 	}
 
+	kubeClient, err = k8s.GetK8sClient(in.Kubeconfig, kubeClient)
+	if err != nil {
+		return cmdErr(nil, "error getting k8s client: %v", err)
+	}
+
 	pod := (*v1.Pod)(nil)
 	if kubeClient != nil {
 		pod, err = kubeClient.GetPod(string(k8sArgs.K8S_POD_NAMESPACE), string(k8sArgs.K8S_POD_NAME))
 		if err != nil {
-			if !errors.IsNotFound(err) {
+			var waitErr error
+			// in case of ServiceUnavailable, retry 10 times with 0.5 sec interval
+			if errors.IsServiceUnavailable(err) {
+				pollDuration := 500 * time.Millisecond
+				pollTimeout := 5 * time.Second
+				waitErr = wait.PollImmediate(pollDuration, pollTimeout, func() (bool, error) {
+					pod, err = kubeClient.GetPod(string(k8sArgs.K8S_POD_NAMESPACE), string(k8sArgs.K8S_POD_NAME))
+					return pod != nil, err
+				})
+				// retry failed, then return error with retry out
+				if waitErr != nil {
+					return cmdErr(k8sArgs, "error getting pod by service unavailable: %v", err)
+				}
+			} else if errors.IsNotFound(err) {
+				// If not found, proceed to remove interface with cache
+				pod = nil
+			} else {
+				// Other case, return error
 				return cmdErr(k8sArgs, "error getting pod: %v", err)
 			}
 		}
@@ -714,8 +736,8 @@ func cmdDel(args *skel.CmdArgs, exec invoke.Exec, kubeClient *k8s.ClientInfo) er
 	// Read the cache to get delegates json for the pod
 	netconfBytes, path, err := consumeScratchNetConf(args.ContainerID, in.CNIDir)
 	if err != nil {
-		// Fetch delegates again if cache is not exist
-		if os.IsNotExist(err) {
+		// Fetch delegates again if cache is not exist and pod info can be read
+		if os.IsNotExist(err) && pod != nil {
 			if in.ClusterNetwork != "" {
 				_, err = k8s.GetDefaultNetworks(pod, in, kubeClient, nil)
 				if err != nil {

multus/multus_test.go

@@ -39,6 +39,9 @@ import (
 	"gopkg.in/intel/multus-cni.v3/logging"
 	testhelpers "gopkg.in/intel/multus-cni.v3/testing"
 	"gopkg.in/intel/multus-cni.v3/types"
+
+	"k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes/fake"
 	"k8s.io/client-go/tools/record"
 
@@ -1564,8 +1567,14 @@ var _ = Describe("multus operations cniVersion 0.2.0 config", func() {
 
 		os.Setenv("CNI_COMMAND", "DEL")
 		os.Setenv("CNI_IFNAME", "eth0")
-		// set fKubeClient to nil to emulate no pod info
+
+		// delete pod to emulate no pod info
 		clientInfo.DeletePod(fakePod.ObjectMeta.Namespace, fakePod.ObjectMeta.Name)
+		nilPod, err := clientInfo.Client.Core().Pods(fakePod.ObjectMeta.Namespace).Get(
+			fakePod.ObjectMeta.Name, metav1.GetOptions{})
+		Expect(nilPod).To(BeNil())
+		Expect(errors.IsNotFound(err)).To(BeTrue())
+
 		err = cmdDel(args, fExec, clientInfo)
 		Expect(err).NotTo(HaveOccurred())
 		Expect(fExec.delIndex).To(Equal(len(fExec.plugins)))
@@ -2070,8 +2079,9 @@ var _ = Describe("multus operations cniVersion 0.2.0 config", func() {
 		fExec.addPlugin020(nil, "eth0", expectedConf1, nil, nil)
 		os.Setenv("CNI_COMMAND", "ADD")
 		os.Setenv("CNI_IFNAME", "eth0")
-
-		err := cmdDel(args, fExec, nil)
+		_, err := cmdAdd(args, fExec, nil)
+		Expect(err).NotTo(HaveOccurred())
+		err = cmdDel(args, fExec, nil)
 		Expect(err).NotTo(HaveOccurred())
 	})
 })

netutils/netutils.go

@@ -20,8 +20,8 @@ import (
 	cnitypes "github.com/containernetworking/cni/pkg/types"
 	"github.com/containernetworking/cni/pkg/types/current"
 	"github.com/containernetworking/plugins/pkg/ns"
-	"gopkg.in/intel/multus-cni.v3/logging"
 	"github.com/vishvananda/netlink"
+	"gopkg.in/intel/multus-cni.v3/logging"
 	"net"
 	"strings"
 )

types/conf_test.go

@@ -26,8 +26,8 @@ import (
 	types020 "github.com/containernetworking/cni/pkg/types/020"
 	"github.com/containernetworking/plugins/pkg/ns"
 	"github.com/containernetworking/plugins/pkg/testutils"
-	testhelpers "gopkg.in/intel/multus-cni.v3/testing"
 	netutils "github.com/k8snetworkplumbingwg/network-attachment-definition-client/pkg/utils"
+	testhelpers "gopkg.in/intel/multus-cni.v3/testing"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"