Use integer ranges in for loops

This was flagged by the `intrange` linter.

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

coredns/loadbalancer/smooth_weighted_round_robin_test.go

@@ -59,7 +59,7 @@ var _ = Describe("Smooth Weighted RR", func() {
 
 	// Validations
 	validateServerAdded := func(s server) {
-		for i := 0; i < 100; i++ {
+		for range 100 {
 			if lb.Next() == s.name {
 				return
 			}
@@ -75,15 +75,15 @@ var _ = Describe("Smooth Weighted RR", func() {
 
 	validateEmptyLBState := func() {
 		Expect(lb.ItemCount()).To(Equal(0))
-		for i := 0; i < 100; i++ {
+		for range 100 {
 			Expect(lb.Next()).To(BeNil())
 		}
 	}
 
 	validateLoadBalancingByCount := func(rounds int, servers []server) {
 		totalServersWeight := getTotalServesWeight(servers)
 		results := make(map[string]int64)
-		for i := 0; i < rounds; i++ {
+		for range rounds {
 			s := lb.Next().(string)
 			results[s]++
 		}
@@ -170,7 +170,7 @@ var _ = Describe("Smooth Weighted RR", func() {
 		It("Next() should return it all the time", func() {
 			s := servers[0]
 			addServer(s)
-			for i := 0; i < 10; i++ {
+			for range 10 {
 				Expect(lb.Next()).To(Equal(s.name))
 			}
 		})
@@ -192,7 +192,7 @@ var _ = Describe("Smooth Weighted RR", func() {
 				err := lb.Add(s.name, s.weight)
 				Expect(err).ToNot(HaveOccurred())
 			}
-			for i := 0; i < 100; i++ {
+			for range 100 {
 				for _, s := range roundRobinServers {
 					Expect(lb.Next().(string)).To(Equal(s.name))
 				}

coredns/resolver/clusterip_service_test.go

@@ -56,15 +56,15 @@ func testClusterIPServiceInOneCluster() {
 
 	Context("and no specific cluster is requested", func() {
 		It("should consistently return its DNS record", func() {
-			for i := 0; i < 5; i++ {
+			for range 5 {
 				t.assertDNSRecordsFound(namespace1, service1, "", "", false, expDNSRecord)
 			}
 		})
 	})
 
 	Context("and the cluster is requested", func() {
 		It("should consistently return its DNS record", func() {
-			for i := 0; i < 5; i++ {
+			for range 5 {
 				t.assertDNSRecordsFound(namespace1, service1, clusterID1, "", false, expDNSRecord)
 			}
 		})
@@ -145,7 +145,7 @@ func testClusterIPServiceInTwoClusters() {
 		})
 
 		It("should consistently return its DNS record", func() {
-			for i := 0; i < 10; i++ {
+			for range 10 {
 				Expect(t.getNonHeadlessDNSRecord(namespace1, service1, "").IP).To(Equal(serviceIP1))
 			}
 		})
@@ -164,7 +164,7 @@ func testClusterIPServiceInTwoClusters() {
 
 		Context("and no specific cluster is requested", func() {
 			It("should consistently return the DNS record of the connected cluster", func() {
-				for i := 0; i < 10; i++ {
+				for range 10 {
 					t.assertDNSRecordsFound(namespace1, service1, "", "", false, expDNSRecord)
 				}
 			})
@@ -210,7 +210,7 @@ func testClusterIPServiceInTwoClusters() {
 
 		Context("and no specific cluster is requested", func() {
 			It("should consistently return the DNS record of the healthy cluster", func() {
-				for i := 0; i < 10; i++ {
+				for range 10 {
 					t.assertDNSRecordsFound(namespace1, service1, "", "", false, expDNSRecord)
 				}
 			})
@@ -245,7 +245,7 @@ func testClusterIPServiceInTwoClusters() {
 		})
 
 		It("should consistently return the DNS record of the remaining cluster", func() {
-			for i := 0; i < 10; i++ {
+			for range 10 {
 				t.assertDNSRecordsFound(namespace1, service1, "", "", false, expDNSRecord)
 			}
 		})
@@ -279,7 +279,7 @@ func testClusterIPServiceInThreeClusters() {
 		})
 
 		It("should consistently return the merged service ports", func() {
-			for i := 0; i < 10; i++ {
+			for range 10 {
 				Expect(t.getNonHeadlessDNSRecord(namespace1, service1, "").Ports).To(Equal([]mcsv1a1.ServicePort{port1}))
 			}
 		})
@@ -293,7 +293,7 @@ func testClusterIPServiceInThreeClusters() {
 		}
 
 		It("should consistently return its DNS record", func() {
-			for i := 0; i < 10; i++ {
+			for range 10 {
 				t.assertDNSRecordsFound(namespace1, service1, clusterID2, "", false, expDNSRecord)
 			}
 		})
@@ -320,7 +320,7 @@ func testClusterIPServiceInThreeClusters() {
 
 		Context("and subsequently healthy again", func() {
 			It("should consistently return the all DNS records round-robin", func() {
-				for i := 0; i < 5; i++ {
+				for range 5 {
 					Expect(t.getNonHeadlessDNSRecord(namespace1, service1, "").IP).To(Or(Equal(serviceIP1), Equal(serviceIP3)))
 				}
 

coredns/resolver/resolver_suite_test.go

@@ -259,15 +259,15 @@ func (t *testDriver) testRoundRobin(ns, service string, serviceIPs ...string) {
 	ipsCount := len(serviceIPs)
 	rrIPs := make([]string, 0)
 
-	for i := 0; i < ipsCount; i++ {
+	for i := range ipsCount {
 		r := t.getNonHeadlessDNSRecord(ns, service, "")
 		rrIPs = append(rrIPs, r.IP)
 		slice := rrIPs[0:i]
 		Expect(slice).ToNot(ContainElement(r.IP))
 		Expect(serviceIPs).To(ContainElement(r.IP))
 	}
 
-	for i := 0; i < 5; i++ {
+	for range 5 {
 		for _, ip := range rrIPs {
 			testIP := t.getNonHeadlessDNSRecord(ns, service, "").IP
 			Expect(testIP).To(Equal(ip))

coredns/resolver/service_info.go

@@ -75,7 +75,7 @@ func (si *serviceInfo) newRecordFrom(from *DNSRecord) *DNSRecord {
 
 func (si *serviceInfo) selectIP(checkCluster func(string) bool) *DNSRecord {
 	queueLength := si.balancer.ItemCount()
-	for i := 0; i < queueLength; i++ {
+	for range queueLength {
 		clusterID := si.balancer.Next().(string)
 		clusterInfo := si.clusters[clusterID]
 

pkg/agent/controller/controller_suite_test.go

@@ -510,7 +510,7 @@ func (c *cluster) awaitServiceExportCondition(expected ...*mcsv1a1.ServiceExport
 	actual := make([]*mcsv1a1.ServiceExportCondition, len(expected))
 	lastIndex := -1
 
-	for i := 0; i < len(expected)-1; i++ {
+	for i := range len(expected) - 1 {
 		j := lastIndex + 1
 
 		Eventually(func() interface{} {

test/e2e/discovery/service_discovery.go

@@ -645,7 +645,7 @@ func verifyRoundRobinWithDig(f *framework.Framework, srcCluster framework.Cluste
 
 	var retIPs []string
 
-	for count := 0; count < 10; count++ {
+	for range 10 {
 		framework.AwaitUntil("verify if service IP is discoverable", func() (interface{}, error) {
 			stdout, _, err := f.ExecWithOptions(context.TODO(), &framework.ExecOptions{
 				Command:       cmd,

test/e2e/framework/framework.go

@@ -408,7 +408,7 @@ func (f *Framework) AwaitPodIngressIPs(targetCluster framework.ClusterIndex, svc
 	hostNameList = make([]string, 0)
 	ipList = make([]string, 0)
 
-	for i := 0; i < len(podList.Items); i++ {
+	for i := range len(podList.Items) {
 		ingressIPName := fmt.Sprintf("pod-%s", podList.Items[i].Name)
 		ingressIP := f.Framework.AwaitGlobalIngressIP(targetCluster, ingressIPName, svc.Namespace)