Make deleteEndpointConnection test use syncProxyRules

Rather than calling fp.deleteEndpointConnection() directly, set up the
proxy to have syncProxyRules() call it, so that we are testing it in
the way that it actually gets called.

Squash the IPv4 and IPv6 unit tests together so we don't need to
duplicate all that code. Fix a tiny bug in NewFakeProxier() found
while doing this...

pkg/proxy/iptables/proxier_test.go

@@ -60,7 +60,7 @@ import (
 	"k8s.io/utils/pointer"
 )
 
-func TestDeleteEndpointConnectionsIPv4(t *testing.T) {
+func TestDeleteEndpointConnections(t *testing.T) {
 	const (
 		UDP  = v1.ProtocolUDP
 		TCP  = v1.ProtocolTCP
@@ -73,8 +73,7 @@ func TestDeleteEndpointConnectionsIPv4(t *testing.T) {
 		svcIP        string
 		svcPort      int32
 		protocol     v1.Protocol
-		endpoint     string                // IP:port endpoint
+		endpoint     string // IP:port endpoint
-		epSvcPair    proxy.ServiceEndpoint // Will be generated by test
 		simulatedErr string
 	}{
 		{
@@ -104,140 +103,21 @@ func TestDeleteEndpointConnectionsIPv4(t *testing.T) {
 		{
 			description:  "V4 UDP, nothing to delete, benign error",
 			svcName:      "v4-udp-nothing-to-delete",
-			svcIP:        "172.30.1.1",
+			svcIP:        "172.30.4.4",
 			svcPort:      80,
 			protocol:     UDP,
-			endpoint:     "10.240.0.3:80",
+			endpoint:     "10.240.0.6:80",
 			simulatedErr: conntrack.NoConnectionToDelete,
 		},
 		{
 			description:  "V4 UDP, unexpected error, should be glogged",
 			svcName:      "v4-udp-simulated-error",
-			svcIP:        "172.30.1.1",
+			svcIP:        "172.30.5.5",
 			svcPort:      80,
 			protocol:     UDP,
-			endpoint:     "10.240.0.3:80",
+			endpoint:     "10.240.0.7:80",
 			simulatedErr: "simulated error",
 		},
-	}
-
-	// Create a fake executor for the conntrack utility. This should only be
-	// invoked for UDP and SCTP connections, since no conntrack cleanup is needed for TCP
-	fcmd := fakeexec.FakeCmd{}
-	fexec := &fakeexec.FakeExec{
-		LookPathFunc: func(cmd string) (string, error) { return cmd, nil },
-	}
-	execFunc := func(cmd string, args ...string) exec.Cmd {
-		return fakeexec.InitFakeCmd(&fcmd, cmd, args...)
-	}
-	for _, tc := range testCases {
-		if tc.protocol == UDP {
-			var cmdOutput string
-			var simErr error
-			if tc.simulatedErr == "" {
-				cmdOutput = "1 flow entries have been deleted"
-			} else {
-				simErr = fmt.Errorf(tc.simulatedErr)
-			}
-			cmdFunc := func() ([]byte, []byte, error) { return []byte(cmdOutput), nil, simErr }
-			fcmd.CombinedOutputScript = append(fcmd.CombinedOutputScript, cmdFunc)
-			fexec.CommandScript = append(fexec.CommandScript, execFunc)
-		}
-	}
-
-	ipt := iptablestest.NewFake()
-	fp := NewFakeProxier(ipt)
-	fp.exec = fexec
-
-	for _, tc := range testCases {
-		makeServiceMap(fp,
-			makeTestService("ns1", tc.svcName, func(svc *v1.Service) {
-				svc.Spec.ClusterIP = tc.svcIP
-				svc.Spec.Ports = []v1.ServicePort{{
-					Name:     "p80",
-					Port:     tc.svcPort,
-					Protocol: tc.protocol,
-				}}
-				svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyLocal
-			}),
-		)
-
-		fp.svcPortMap.Update(fp.serviceChanges)
-	}
-
-	// Run the test cases
-	for _, tc := range testCases {
-		priorExecs := fexec.CommandCalls
-		priorGlogErrs := klog.Stats.Error.Lines()
-
-		svc := proxy.ServicePortName{
-			NamespacedName: types.NamespacedName{Namespace: "ns1", Name: tc.svcName},
-			Port:           "p80",
-			Protocol:       tc.protocol,
-		}
-		input := []proxy.ServiceEndpoint{
-			{
-				Endpoint:        tc.endpoint,
-				ServicePortName: svc,
-			},
-		}
-
-		fp.deleteUDPEndpointConnections(input)
-
-		// For UDP and SCTP connections, check the executed conntrack command
-		var expExecs int
-		if tc.protocol == UDP {
-			isIPv6 := func(ip string) bool {
-				netIP := netutils.ParseIPSloppy(ip)
-				return netIP.To4() == nil
-			}
-			endpointIP := utilproxy.IPPart(tc.endpoint)
-			expectCommand := fmt.Sprintf("conntrack -D --orig-dst %s --dst-nat %s -p %s", tc.svcIP, endpointIP, strings.ToLower(string((tc.protocol))))
-			if isIPv6(endpointIP) {
-				expectCommand += " -f ipv6"
-			}
-			actualCommand := strings.Join(fcmd.CombinedOutputLog[fexec.CommandCalls-1], " ")
-			if actualCommand != expectCommand {
-				t.Errorf("%s: Expected command: %s, but executed %s", tc.description, expectCommand, actualCommand)
-			}
-			expExecs = 1
-		}
-
-		// Check the number of times conntrack was executed
-		execs := fexec.CommandCalls - priorExecs
-		if execs != expExecs {
-			t.Errorf("%s: Expected conntrack to be executed %d times, but got %d", tc.description, expExecs, execs)
-		}
-
-		// Check the number of new glog errors
-		var expGlogErrs int64
-		if tc.simulatedErr != "" && tc.simulatedErr != conntrack.NoConnectionToDelete {
-			expGlogErrs = 1
-		}
-		glogErrs := klog.Stats.Error.Lines() - priorGlogErrs
-		if glogErrs != expGlogErrs {
-			t.Errorf("%s: Expected %d glogged errors, but got %d", tc.description, expGlogErrs, glogErrs)
-		}
-	}
-}
-
-func TestDeleteEndpointConnectionsIPv6(t *testing.T) {
-	const (
-		UDP  = v1.ProtocolUDP
-		TCP  = v1.ProtocolTCP
-		SCTP = v1.ProtocolSCTP
-	)
-
-	testCases := []struct {
-		description  string
-		svcName      string
-		svcIP        string
-		svcPort      int32
-		protocol     v1.Protocol
-		endpoint     string                // IP:port endpoint
-		epSvcPair    proxy.ServiceEndpoint // Will be generated by test
-		simulatedErr string
-	}{
 		{
 			description: "V6 UDP",
 			svcName:     "v6-udp",
@@ -264,103 +144,128 @@ func TestDeleteEndpointConnectionsIPv6(t *testing.T) {
 		},
 	}
 
-	// Create a fake executor for the conntrack utility. This should only be
-	// invoked for UDP connections, since no conntrack cleanup is needed for TCP
-	fcmd := fakeexec.FakeCmd{}
-	fexec := &fakeexec.FakeExec{
-		LookPathFunc: func(cmd string) (string, error) { return cmd, nil },
-	}
-	execFunc := func(cmd string, args ...string) exec.Cmd {
-		return fakeexec.InitFakeCmd(&fcmd, cmd, args...)
-	}
 	for _, tc := range testCases {
-		if tc.protocol == UDP {
+		t.Run(tc.description, func(t *testing.T) {
-			var cmdOutput string
+			priorGlogErrs := klog.Stats.Error.Lines()
-			var simErr error
+
-			if tc.simulatedErr == "" {
+			// Create a fake executor for the conntrack utility.
-				cmdOutput = "1 flow entries have been deleted"
+			fcmd := fakeexec.FakeCmd{}
-			} else {
+			fexec := &fakeexec.FakeExec{
-				simErr = fmt.Errorf(tc.simulatedErr)
+				LookPathFunc: func(cmd string) (string, error) { return cmd, nil },
 			}
-			cmdFunc := func() ([]byte, []byte, error) { return []byte(cmdOutput), nil, simErr }
+			execFunc := func(cmd string, args ...string) exec.Cmd {
-			fcmd.CombinedOutputScript = append(fcmd.CombinedOutputScript, cmdFunc)
+				return fakeexec.InitFakeCmd(&fcmd, cmd, args...)
-			fexec.CommandScript = append(fexec.CommandScript, execFunc)
-		}
-	}
-
-	ipt := iptablestest.NewIPv6Fake()
-	fp := NewFakeProxier(ipt)
-	fp.exec = fexec
-
-	for _, tc := range testCases {
-		makeServiceMap(fp,
-			makeTestService("ns1", tc.svcName, func(svc *v1.Service) {
-				svc.Spec.ClusterIP = tc.svcIP
-				svc.Spec.Ports = []v1.ServicePort{{
-					Name:     "p80",
-					Port:     tc.svcPort,
-					Protocol: tc.protocol,
-				}}
-				svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyLocal
-			}),
-		)
-
-		fp.svcPortMap.Update(fp.serviceChanges)
-	}
-
-	// Run the test cases
-	for _, tc := range testCases {
-		priorExecs := fexec.CommandCalls
-		priorGlogErrs := klog.Stats.Error.Lines()
-
-		svc := proxy.ServicePortName{
-			NamespacedName: types.NamespacedName{Namespace: "ns1", Name: tc.svcName},
-			Port:           "p80",
-			Protocol:       tc.protocol,
-		}
-		input := []proxy.ServiceEndpoint{
-			{
-				Endpoint:        tc.endpoint,
-				ServicePortName: svc,
-			},
-		}
-
-		fp.deleteUDPEndpointConnections(input)
-
-		// For UDP connections, check the executed conntrack command
-		var expExecs int
-		if tc.protocol == UDP {
-			isIPv6 := func(ip string) bool {
-				netIP := netutils.ParseIPSloppy(ip)
-				return netIP.To4() == nil
 			}
+
+			if tc.protocol == UDP {
+				cmdOutput := "1 flow entries have been deleted"
+				var simErr error
+
+				// First call outputs cmdOutput and succeeds
+				fcmd.CombinedOutputScript = append(fcmd.CombinedOutputScript,
+					func() ([]byte, []byte, error) { return []byte(cmdOutput), nil, nil },
+				)
+				fexec.CommandScript = append(fexec.CommandScript, execFunc)
+
+				// Second call may succeed or fail
+				if tc.simulatedErr != "" {
+					cmdOutput = ""
+					simErr = fmt.Errorf(tc.simulatedErr)
+				}
+				fcmd.CombinedOutputScript = append(fcmd.CombinedOutputScript,
+					func() ([]byte, []byte, error) { return []byte(cmdOutput), nil, simErr },
+				)
+				fexec.CommandScript = append(fexec.CommandScript, execFunc)
+			}
+
 			endpointIP := utilproxy.IPPart(tc.endpoint)
-			expectCommand := fmt.Sprintf("conntrack -D --orig-dst %s --dst-nat %s -p udp", tc.svcIP, endpointIP)
+			isIPv6 := netutils.IsIPv6String(endpointIP)
-			if isIPv6(endpointIP) {
-				expectCommand += " -f ipv6"
-			}
-			actualCommand := strings.Join(fcmd.CombinedOutputLog[fexec.CommandCalls-1], " ")
-			if actualCommand != expectCommand {
-				t.Errorf("%s: Expected command: %s, but executed %s", tc.description, expectCommand, actualCommand)
-			}
-			expExecs = 1
-		}
 
-		// Check the number of times conntrack was executed
+			var ipt utiliptables.Interface
-		execs := fexec.CommandCalls - priorExecs
+			if isIPv6 {
-		if execs != expExecs {
+				ipt = iptablestest.NewIPv6Fake()
-			t.Errorf("%s: Expected conntrack to be executed %d times, but got %d", tc.description, expExecs, execs)
+			} else {
-		}
+				ipt = iptablestest.NewFake()
+			}
+			fp := NewFakeProxier(ipt)
+			fp.exec = fexec
 
-		// Check the number of new glog errors
+			makeServiceMap(fp,
-		var expGlogErrs int64
+				makeTestService("ns1", tc.svcName, func(svc *v1.Service) {
-		if tc.simulatedErr != "" && tc.simulatedErr != conntrack.NoConnectionToDelete {
+					svc.Spec.ClusterIP = tc.svcIP
-			expGlogErrs = 1
+					svc.Spec.Ports = []v1.ServicePort{{
-		}
+						Name:     "p80",
-		glogErrs := klog.Stats.Error.Lines() - priorGlogErrs
+						Port:     tc.svcPort,
-		if glogErrs != expGlogErrs {
+						Protocol: tc.protocol,
-			t.Errorf("%s: Expected %d glogged errors, but got %d", tc.description, expGlogErrs, glogErrs)
+					}}
-		}
+					svc.Spec.ExternalTrafficPolicy = v1.ServiceExternalTrafficPolicyLocal
+				}),
+			)
+			fp.svcPortMap.Update(fp.serviceChanges)
+
+			slice := makeTestEndpointSlice("ns1", tc.svcName, 1, func(eps *discovery.EndpointSlice) {
+				if isIPv6 {
+					eps.AddressType = discovery.AddressTypeIPv6
+				} else {
+					eps.AddressType = discovery.AddressTypeIPv4
+				}
+				eps.Endpoints = []discovery.Endpoint{{
+					Addresses: []string{endpointIP},
+				}}
+				eps.Ports = []discovery.EndpointPort{{
+					Name:     pointer.String("p80"),
+					Port:     pointer.Int32(80),
+					Protocol: &tc.protocol,
+				}}
+			})
+
+			// Add and then remove the endpoint slice
+			fp.OnEndpointSliceAdd(slice)
+			fp.syncProxyRules()
+			fp.OnEndpointSliceDelete(slice)
+			fp.syncProxyRules()
+
+			// Check the executed conntrack command
+			if tc.protocol == UDP {
+				if fexec.CommandCalls != 2 {
+					t.Fatalf("Expected conntrack to be executed 2 times, but got %d", fexec.CommandCalls)
+				}
+
+				// First clear conntrack entries for the clusterIP when the
+				// endpoint is first added.
+				expectCommand := fmt.Sprintf("conntrack -D --orig-dst %s -p udp", tc.svcIP)
+				if isIPv6 {
+					expectCommand += " -f ipv6"
+				}
+				actualCommand := strings.Join(fcmd.CombinedOutputLog[0], " ")
+				if actualCommand != expectCommand {
+					t.Errorf("Expected command: %s, but executed %s", expectCommand, actualCommand)
+				}
+
+				// Then clear conntrack entries for the endpoint when it is
+				// deleted.
+				expectCommand = fmt.Sprintf("conntrack -D --orig-dst %s --dst-nat %s -p udp", tc.svcIP, endpointIP)
+				if isIPv6 {
+					expectCommand += " -f ipv6"
+				}
+				actualCommand = strings.Join(fcmd.CombinedOutputLog[1], " ")
+				if actualCommand != expectCommand {
+					t.Errorf("Expected command: %s, but executed %s", expectCommand, actualCommand)
+				}
+			} else if fexec.CommandCalls != 0 {
+				t.Fatalf("Expected conntrack to be executed 0 times, but got %d", fexec.CommandCalls)
+			}
+
+			// Check the number of new glog errors
+			var expGlogErrs int64
+			if tc.simulatedErr != "" && tc.simulatedErr != conntrack.NoConnectionToDelete {
+				expGlogErrs = 1
+			}
+			glogErrs := klog.Stats.Error.Lines() - priorGlogErrs
+			if glogErrs != expGlogErrs {
+				t.Errorf("Expected %d glogged errors, but got %d", expGlogErrs, glogErrs)
+			}
+		})
 	}
 }
 
@@ -384,10 +289,12 @@ func NewFakeProxier(ipt utiliptables.Interface) *Proxier {
 	// TODO: Call NewProxier after refactoring out the goroutine
 	// invocation into a Run() method.
 	ipfamily := v1.IPv4Protocol
+	podCIDR := "10.0.0.0/8"
 	if ipt.IsIPv6() {
 		ipfamily = v1.IPv6Protocol
+		podCIDR = "fd00::/64"
 	}
-	detectLocal, _ := proxyutiliptables.NewDetectLocalByCIDR("10.0.0.0/8", ipt)
+	detectLocal, _ := proxyutiliptables.NewDetectLocalByCIDR(podCIDR, ipt)
 
 	networkInterfacer := utilproxytest.NewFakeNetwork()
 	itf := net.Interface{Index: 0, MTU: 0, Name: "lo", HardwareAddr: nil, Flags: 0}