refactoring eniconfig func to only take node as parameter

Makefile

@@ -147,7 +147,7 @@ build-aws-vpc-cni:    ## Build the VPC CNI container using the host's Go toolcha
 	go build $(VENDOR_OVERRIDE_FLAG) $(BUILD_FLAGS) -o aws-vpc-cni     ./cmd/aws-vpc-cni
 
 # Build VPC CNI plugin & agent container image.
-docker:	setup-ec2-sdk-override	   ## Build VPC CNI plugin & agent container image.
+docker:	setup-ec2-sdk-override     ## Build VPC CNI plugin & agent container image.
 	docker build $(DOCKER_BUILD_FLAGS_CNI) \
 		-f scripts/dockerfiles/Dockerfile.release \
 		-t "$(IMAGE_NAME)" \

pkg/eniconfig/eniconfig.go

@@ -25,6 +25,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/client"
 
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/apis/crd/v1alpha1"
+	"github.com/aws/amazon-vpc-cni-k8s/pkg/k8sapi"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/utils/logger"
 )
 
@@ -69,9 +70,14 @@ type ENIConfigInfo struct {
 
 // MyENIConfig returns the ENIConfig applicable to the particular node
 func MyENIConfig(ctx context.Context, k8sClient client.Client) (*v1alpha1.ENIConfigSpec, error) {
-	eniConfigName, err := GetNodeSpecificENIConfigName(ctx, k8sClient)
+	node, err := k8sapi.GetNode(ctx, k8sClient)
 	if err != nil {
-		log.Debugf("Error while retrieving Node name")
+		log.Debugf("Error while retrieving Node")
+	}
+
+	eniConfigName, err := GetNodeSpecificENIConfigName(node)
+	if err != nil {
+		log.Debugf("Error while retrieving Node ENIConfig name")
 	}
 
 	log.Infof("Found ENI Config Name: %s", eniConfigName)
@@ -116,17 +122,9 @@ func getEniConfigLabelDef() string {
 	return defaultEniConfigLabelDef
 }
 
-func GetNodeSpecificENIConfigName(ctx context.Context, k8sClient client.Client) (string, error) {
+func GetNodeSpecificENIConfigName(node corev1.Node) (string, error) {
 	var eniConfigName string
 
-	log.Infof("Get Node Info for: %s", os.Getenv("MY_NODE_NAME"))
-	var node corev1.Node
-	err := k8sClient.Get(ctx, types.NamespacedName{Name: os.Getenv("MY_NODE_NAME")}, &node)
-	if err != nil {
-		log.Errorf("error retrieving node: %s", err)
-		return eniConfigName, err
-	}
-
 	//Derive ENIConfig Name from either externally managed label, Node Annotations or Labels
 	labels := node.GetLabels()
 	eniConfigName, ok := labels[externalEniConfigLabel]

pkg/ipamd/introspect.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/eniconfig"
+	"github.com/aws/amazon-vpc-cni-k8s/pkg/k8sapi"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/networkutils"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/utils/retry"
 )
@@ -144,7 +145,13 @@ func eniV1RequestHandler(ipam *IPAMContext) func(http.ResponseWriter, *http.Requ
 func eniConfigRequestHandler(ipam *IPAMContext) func(http.ResponseWriter, *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
 		ctx := r.Context()
-		myENIConfig, err := eniconfig.GetNodeSpecificENIConfigName(ctx, ipam.cachedK8SClient)
+		node, err := k8sapi.GetNode(ctx, ipam.cachedK8SClient)
+		if err != nil {
+			log.Errorf("Failed to get host node: %v", err)
+			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+			return
+		}
+		myENIConfig, err := eniconfig.GetNodeSpecificENIConfigName(node)
 		if err != nil {
 			log.Errorf("Failed to get ENI config: %v", err)
 			http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)

pkg/ipamd/ipamd.go

@@ -40,6 +40,7 @@ import (
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/awsutils"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/eniconfig"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/ipamd/datastore"
+	"github.com/aws/amazon-vpc-cni-k8s/pkg/k8sapi"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/networkutils"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/utils/eventrecorder"
 	"github.com/aws/amazon-vpc-cni-k8s/pkg/utils/logger"
@@ -566,7 +567,14 @@ func (c *IPAMContext) nodeInit() error {
 		vpcV4CIDRs = c.updateCIDRsRulesOnChange(vpcV4CIDRs)
 	}, 30*time.Second)
 
-	eniConfigName, err := eniconfig.GetNodeSpecificENIConfigName(ctx, c.cachedK8SClient)
+	node, err := k8sapi.GetNode(ctx, c.cachedK8SClient)
+	if err != nil {
+		log.Errorf("Failed to host node", err)
+		podENIErrInc("nodeInit")
+		return err
+	}
+
+	eniConfigName, err := eniconfig.GetNodeSpecificENIConfigName(node)
 	if err == nil && c.useCustomNetworking && eniConfigName != "default" {
 		// Signal to VPC Resource Controller that the node is using custom networking
 		err := c.SetNodeLabel(ctx, vpcENIConfigLabel, eniConfigName)

pkg/ipamd/ipamd_test.go

@@ -183,7 +183,7 @@ func TestNodeInit(t *testing.T) {
 
 	// Add IPs
 	m.awsutils.EXPECT().AllocIPAddresses(gomock.Any(), gomock.Any())
-
+	os.Setenv("MY_NODE_NAME", myNodeName)
 	err := mockContext.nodeInit()
 	assert.NoError(t, err)
 }

pkg/k8sapi/k8sutils.go

@@ -1,11 +1,14 @@
 package k8sapi
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"time"
 
+	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/types"
 	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
 	"sigs.k8s.io/controller-runtime/pkg/client/apiutil"
 
@@ -141,3 +144,14 @@ func getRestConfig() (*rest.Config, error) {
 	}
 	return restCfg, nil
 }
+
+func GetNode(ctx context.Context, k8sClient client.Client) (corev1.Node, error) {
+	log.Infof("Get Node Info for: %s", os.Getenv("MY_NODE_NAME"))
+	var node corev1.Node
+	err := k8sClient.Get(ctx, types.NamespacedName{Name: os.Getenv("MY_NODE_NAME")}, &node)
+	if err != nil {
+		log.Errorf("error retrieving node: %s", err)
+		return node, err
+	}
+	return node, nil
+}

pkg/k8sapi/k8sutils_test.go

@@ -0,0 +1,37 @@
+package k8sapi
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	eniconfigscheme "github.com/aws/amazon-vpc-cni-k8s/pkg/apis/crd/v1alpha1"
+	"github.com/stretchr/testify/assert"
+	corev1 "k8s.io/api/core/v1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
+	"sigs.k8s.io/controller-runtime/pkg/client/fake"
+)
+
+func TestGetNode(t *testing.T) {
+	ctx := context.Background()
+	k8sSchema := runtime.NewScheme()
+	clientgoscheme.AddToScheme(k8sSchema)
+	eniconfigscheme.AddToScheme(k8sSchema)
+
+	fakeNode := &corev1.Node{
+		ObjectMeta: v1.ObjectMeta{
+			Name: "testNode",
+		},
+	}
+	k8sClient := fake.NewFakeClientWithScheme(k8sSchema, fakeNode)
+	os.Setenv("MY_NODE_NAME", "testNode")
+	node, err := GetNode(ctx, k8sClient)
+	assert.NoError(t, err)
+	assert.Equal(t, node.Name, "testNode")
+
+	os.Setenv("MY_NODE_NAME", "dummyNode")
+	_, err = GetNode(ctx, k8sClient)
+	assert.Error(t, err)
+}