Improvements for proxy utils GetNodeAddresses

pkg/proxy/ipvs/proxier.go

@@ -1104,8 +1104,7 @@ func (proxier *Proxier) syncProxyRules() {
 		nodeAddrSet, err := utilproxy.GetNodeAddresses(proxier.nodePortAddresses, proxier.networkInterfacer)
 		if err != nil {
 			klog.Errorf("Failed to get node ip address matching nodeport cidr: %v", err)
-		}
-		if err == nil && nodeAddrSet.Len() > 0 {
+		} else {
 			nodeAddresses = nodeAddrSet.List()
 			for _, address := range nodeAddresses {
 				if utilproxy.IsZeroCIDR(address) {

pkg/proxy/util/utils.go

@@ -181,29 +181,35 @@ func GetNodeAddresses(cidrs []string, nw NetworkInterfacer) (sets.String, error)
 			uniqueAddressList.Insert(cidr)
 		}
 	}
+
+	itfs, err := nw.Interfaces()
+	if err != nil {
+		return nil, fmt.Errorf("error listing all interfaces from host, error: %v", err)
+	}
+
 	// Second round of iteration to parse IPs based on cidr.
 	for _, cidr := range cidrs {
 		if IsZeroCIDR(cidr) {
 			continue
 		}
+
 		_, ipNet, _ := net.ParseCIDR(cidr)
-		itfs, err := nw.Interfaces()
-		if err != nil {
-			return nil, fmt.Errorf("error listing all interfaces from host, error: %v", err)
-		}
 		for _, itf := range itfs {
 			addrs, err := nw.Addrs(&itf)
 			if err != nil {
 				return nil, fmt.Errorf("error getting address from interface %s, error: %v", itf.Name, err)
 			}
+
 			for _, addr := range addrs {
 				if addr == nil {
 					continue
 				}
+
 				ip, _, err := net.ParseCIDR(addr.String())
 				if err != nil {
 					return nil, fmt.Errorf("error parsing CIDR for interface %s, error: %v", itf.Name, err)
 				}
+
 				if ipNet.Contains(ip) {
 					if utilnet.IsIPv6(ip) && !uniqueAddressList.Has(IPv6ZeroCIDR) {
 						uniqueAddressList.Insert(ip.String())
@@ -215,6 +221,11 @@ func GetNodeAddresses(cidrs []string, nw NetworkInterfacer) (sets.String, error)
 			}
 		}
 	}
+
+	if uniqueAddressList.Len() == 0 {
+		return nil, fmt.Errorf("no addresses found for cidrs %v", cidrs)
+	}
+
 	return uniqueAddressList, nil
 }
 

pkg/proxy/util/utils_test.go

@@ -18,6 +18,7 @@ package util
 
 import (
 	"context"
+	"fmt"
 	"net"
 	"reflect"
 	"testing"
@@ -260,6 +261,7 @@ func TestGetNodeAddressses(t *testing.T) {
 		nw            *fake.FakeNetwork
 		itfAddrsPairs []InterfaceAddrsPair
 		expected      sets.String
+		expectedErr   error
 	}{
 		{ // case 0
 			cidrs: []string{"10.20.30.0/24"},
@@ -375,7 +377,8 @@ func TestGetNodeAddressses(t *testing.T) {
 					addrs: []net.Addr{fake.AddrStruct{Val: "127.0.0.1/8"}},
 				},
 			},
-			expected: sets.NewString(),
+			expected:    nil,
+			expectedErr: fmt.Errorf("no addresses found for cidrs %v", []string{"10.20.30.0/24", "100.200.201.0/24"}),
 		},
 		{ // case 8
 			cidrs: []string{},
@@ -455,9 +458,10 @@ func TestGetNodeAddressses(t *testing.T) {
 			testCases[i].nw.AddInterfaceAddr(&pair.itf, pair.addrs)
 		}
 		addrList, err := GetNodeAddresses(testCases[i].cidrs, testCases[i].nw)
-		if err != nil {
+		if !reflect.DeepEqual(err, testCases[i].expectedErr) {
 			t.Errorf("case [%d], unexpected error: %v", i, err)
 		}
+
 		if !addrList.Equal(testCases[i].expected) {
 			t.Errorf("case [%d], unexpected mismatch, expected: %v, got: %v", i, testCases[i].expected, addrList)
 		}