Support self mapping

Signed-off-by: Shiming Zhang <wzshiming@foxmail.com>

Author: wzshiming

pkg/router/hubschain.go

@@ -220,9 +220,22 @@ func mergeStrings(a, b []string) []string {
 }
 
 func (h *HubsChain) buildRaw(name string, origin, destination objref.ObjectRef, originPort, peerPort int32, ways []string) (hubsChains map[string][]*Chain, err error) {
-
 	hubsChains = map[string][]*Chain{}
 
+	if len(ways) == 1 {
+		hubName := ways[0]
+		hubChain, err := h.buildSelf(
+			name, origin, destination, originPort, peerPort,
+		)
+		if err != nil {
+			return nil, err
+		}
+		if hubChain != nil {
+			hubsChains[hubName] = append(hubsChains[hubName], hubChain)
+		}
+		return hubsChains, nil
+	}
+
 	for i := 0; i < len(ways)-1; i++ {
 		exportHubName := ways[i]
 		importHubName := ways[i+1]
@@ -254,6 +267,23 @@ func (h *HubsChain) buildRaw(name string, origin, destination objref.ObjectRef,
 	return hubsChains, nil
 }
 
+func (h *HubsChain) buildSelf(
+	name string, origin, destination objref.ObjectRef, originPort, peerPort int32,
+) (hubChain *Chain, err error) {
+	chain := &Chain{
+		Bind:  []string{},
+		Proxy: []string{},
+	}
+
+	destinationAddress := fmt.Sprintf(":%d", peerPort)
+	chain.Bind = append(chain.Bind, destinationAddress)
+
+	originSvc := fmt.Sprintf("%s.%s.svc:%d", origin.Name, origin.Namespace, originPort)
+	chain.Proxy = append(chain.Proxy, originSvc)
+
+	return chain, nil
+}
+
 func (h *HubsChain) buildPeer(
 	name string, origin, destination objref.ObjectRef, originPort, peerPort int32,
 	exportHubName string, exportRepeater bool, exportGateway v1alpha2.HubSpecGateway,

pkg/router/router_test.go

@@ -36,6 +36,110 @@ func TestRouter(t *testing.T) {
 		args fakeRouter
 		want map[string][]objref.KMetadata
 	}{
+		{
+			name: "self",
+			args: fakeRouter{
+				Services: []*corev1.Service{
+					{
+						ObjectMeta: metav1.ObjectMeta{
+							Name:      "svc1",
+							Namespace: "test",
+						},
+						Spec: corev1.ServiceSpec{
+							Ports: []corev1.ServicePort{
+								{
+									Name:     "http",
+									Port:     80,
+									Protocol: corev1.ProtocolTCP,
+								},
+							},
+						},
+					},
+				},
+				Hubs: []*v1alpha2.Hub{
+					{
+						ObjectMeta: metav1.ObjectMeta{
+							Name: "self",
+						},
+						Spec: v1alpha2.HubSpec{
+							Gateway: v1alpha2.HubSpecGateway{
+								Reachable: true,
+								Address:   "10.0.0.1:8080",
+							},
+						},
+					},
+				},
+				Routes: []*v1alpha2.Route{
+					{
+						ObjectMeta: metav1.ObjectMeta{
+							Name:      "svc1",
+							Namespace: "test",
+						},
+						Spec: v1alpha2.RouteSpec{
+							Import: v1alpha2.RouteSpecRule{
+								HubName: "self",
+								Service: v1alpha2.RouteSpecRuleService{
+									Name:      "svc1-new",
+									Namespace: "test",
+								},
+							},
+							Export: v1alpha2.RouteSpecRule{
+								HubName: "self",
+								Service: v1alpha2.RouteSpecRuleService{
+									Name:      "svc1",
+									Namespace: "test",
+								},
+							},
+						},
+					},
+				},
+			},
+
+			want: map[string][]objref.KMetadata{
+				"self": {
+					&corev1.ConfigMap{
+						ObjectMeta: metav1.ObjectMeta{
+							Name:      "svc1-service",
+							Namespace: "ferry-tunnel-system",
+							Labels: map[string]string{
+								"tunnel.ferryproxy.io/config": "service",
+							},
+						},
+						Data: map[string]string{
+							"export_hub_name":          "self",
+							"export_service_name":      "svc1",
+							"export_service_namespace": "test",
+							"import_service_name":      "svc1-new",
+							"import_service_namespace": "test",
+							"ports":                    `[{"name":"http","protocol":"TCP","port":80,"targetPort":10001}]`,
+						},
+					},
+					&corev1.ConfigMap{
+						ObjectMeta: metav1.ObjectMeta{
+							Name:      "svc1-tunnel-80-10001",
+							Namespace: "ferry-tunnel-system",
+							Labels: map[string]string{
+								"tunnel.ferryproxy.io/config": "rules",
+							},
+						},
+						Data: map[string]string{
+							consts.TunnelRulesKey: toJson(
+								[]Chain{
+									{
+										Bind: []string{
+											":10001",
+										},
+										Proxy: []string{
+											"svc1.test.svc:80",
+										},
+									},
+								},
+							),
+						},
+					},
+				},
+			},
+		},
 		{
 			name: "export reachable",
 			args: fakeRouter{