feat: support proxy external service

Author: AlinsRan

internal/controller/ingress_controller.go

@@ -522,17 +522,23 @@ func (r *IngressReconciler) processBackends(tctx *provider.TranslateContext, ing
 func (r *IngressReconciler) processBackendService(tctx *provider.TranslateContext, namespace string, backendService *networkingv1.IngressServiceBackend) error {
 	// get the service
 	var service corev1.Service
-	if err := r.Get(tctx, client.ObjectKey{
+	serviceNS := types.NamespacedName{
 		Namespace: namespace,
 		Name:      backendService.Name,
-	}, &service); err != nil {
+	}
+	if err := r.Get(tctx, serviceNS, &service); err != nil {
 		if client.IgnoreNotFound(err) == nil {
 			r.Log.Info("service not found", "namespace", namespace, "name", backendService.Name)
 			return nil
 		}
 		return err
 	}
 
+	if service.Spec.Type == corev1.ServiceTypeExternalName {
+		tctx.Services[serviceNS] = &service
+		return nil
+	}
+
 	// verify if the port exists
 	var portExists bool
 	if backendService.Port.Number != 0 {
@@ -570,16 +576,8 @@ func (r *IngressReconciler) processBackendService(tctx *provider.TranslateContex
 	}
 
 	// save the endpoint slices to the translate context
-	tctx.EndpointSlices[client.ObjectKey{
-		Namespace: namespace,
-		Name:      backendService.Name,
-	}] = endpointSliceList.Items
-
-	tctx.Services[client.ObjectKey{
-		Namespace: namespace,
-		Name:      backendService.Name,
-	}] = &service
-
+	tctx.EndpointSlices[serviceNS] = endpointSliceList.Items
+	tctx.Services[serviceNS] = &service
 	return nil
 }
 

internal/provider/adc/translator/httproute.go

@@ -5,17 +5,17 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/api7/gopkg/pkg/log"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
+	corev1 "k8s.io/api/core/v1"
 	discoveryv1 "k8s.io/api/discovery/v1"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/utils/ptr"
 	gatewayv1 "sigs.k8s.io/gateway-api/apis/v1"
 
-	"github.com/api7/api7-ingress-controller/api/v1alpha1"
-	"github.com/api7/gopkg/pkg/log"
-
 	adctypes "github.com/api7/api7-ingress-controller/api/adc"
+	"github.com/api7/api7-ingress-controller/api/v1alpha1"
 	"github.com/api7/api7-ingress-controller/internal/controller/label"
 	"github.com/api7/api7-ingress-controller/internal/id"
 	"github.com/api7/api7-ingress-controller/internal/provider"
@@ -289,16 +289,33 @@ func (t *Translator) translateEndpointSlice(weight int, endpointSlices []discove
 }
 
 func (t *Translator) translateBackendRef(tctx *provider.TranslateContext, ref gatewayv1.BackendRef) adctypes.UpstreamNodes {
-	endpointSlices := tctx.EndpointSlices[types.NamespacedName{
-		Namespace: string(*ref.Namespace),
-		Name:      string(ref.Name),
-	}]
-
 	weight := 1
+	port := 80
 	if ref.Weight != nil {
 		weight = int(*ref.Weight)
 	}
+	if ref.Port != nil {
+		port = int(*ref.Port)
+	}
+	key := types.NamespacedName{
+		Namespace: string(*ref.Namespace),
+		Name:      string(ref.Name),
+	}
+	service, ok := tctx.Services[key]
+	if !ok {
+		return adctypes.UpstreamNodes{}
+	}
 
+	if service.Spec.Type == corev1.ServiceTypeExternalName {
+		return adctypes.UpstreamNodes{
+			{
+				Host:   service.Spec.ExternalName,
+				Port:   port,
+				Weight: weight,
+			},
+		}
+	}
+	endpointSlices := tctx.EndpointSlices[key]
 	return t.translateEndpointSlice(weight, endpointSlices)
 }
 

internal/provider/adc/translator/ingress.go

@@ -105,12 +105,7 @@ func (t *Translator) TranslateIngress(tctx *provider.TranslateContext, obj *netw
 
 			// get the EndpointSlice of the backend service
 			backendService := path.Backend.Service
-			var endpointSlices []discoveryv1.EndpointSlice
 			if backendService != nil {
-				endpointSlices = tctx.EndpointSlices[types.NamespacedName{
-					Namespace: obj.Namespace,
-					Name:      backendService.Name,
-				}]
 				backendRef := convertBackendRef(obj.Namespace, backendService.Name, "Service")
 				t.AttachBackendTrafficPolicyToUpstream(backendRef, tctx.BackendTrafficPolicies, upstream)
 			}
@@ -131,28 +126,35 @@ func (t *Translator) TranslateIngress(tctx *provider.TranslateContext, obj *netw
 			if getService == nil {
 				continue
 			}
-
-			var getServicePort *corev1.ServicePort
-			for _, port := range getService.Spec.Ports {
-				port := port
-				if servicePort > 0 && port.Port == servicePort {
-					getServicePort = &port
-					break
+			if getService.Spec.Type == corev1.ServiceTypeExternalName {
+				upstream.Nodes = adctypes.UpstreamNodes{
+					{
+						Host:   getService.Spec.ExternalName,
+						Port:   int(servicePort),
+						Weight: 1,
+					},
 				}
-				if servicePortName != "" && port.Name == servicePortName {
-					getServicePort = &port
-					break
+			} else {
+				var getServicePort *corev1.ServicePort
+				for _, port := range getService.Spec.Ports {
+					port := port
+					if servicePort > 0 && port.Port == servicePort {
+						getServicePort = &port
+						break
+					}
+					if servicePortName != "" && port.Name == servicePortName {
+						getServicePort = &port
+						break
+					}
+				}
+				endpointSlices := tctx.EndpointSlices[types.NamespacedName{
+					Namespace: obj.Namespace,
+					Name:      backendService.Name,
+				}]
+				// convert the EndpointSlice to upstream nodes
+				if len(endpointSlices) > 0 {
+					upstream.Nodes = t.translateEndpointSliceForIngress(1, endpointSlices, getServicePort)
 				}
-			}
-
-			// convert the EndpointSlice to upstream nodes
-			if len(endpointSlices) > 0 {
-				upstream.Nodes = t.translateEndpointSliceForIngress(1, endpointSlices, getServicePort)
-			}
-
-			// if there is no upstream node, create a placeholder node
-			if len(upstream.Nodes) == 0 {
-				upstream.Nodes = adctypes.UpstreamNodes{}
 			}
 
 			service.Upstream = upstream

test/e2e/gatewayapi/httproute.go

@@ -365,6 +365,33 @@ spec:
 	})
 
 	Context("HTTPRoute Base", func() {
+		var httprouteWithExternalName = `
+apiVersion: v1
+kind: Service
+metadata:
+  name: httpbin-external-domain
+spec:
+  type: ExternalName
+  externalName: httpbin.org
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: httpbin
+spec:
+  parentRefs:
+  - name: api7ee
+  hostnames:
+  - httpbin.external
+  rules:
+  - matches: 
+    - path:
+        type: Exact
+        value: /get
+    backendRefs:
+    - name: httpbin-external-domain
+      port: 80
+`
 		var exactRouteByGet = `
 apiVersion: gateway.networking.k8s.io/v1
 kind: HTTPRoute
@@ -437,6 +464,18 @@ spec:
 				Expect().
 				Status(404)
 		})
+
+		It("Proxy external service", func() {
+			By("create HTTPRoute")
+			ResourceApplied("HTTPRoute", "httpbin", httprouteWithExternalName, 1)
+
+			By("checking the external service response")
+			s.NewAPISIXClient().
+				GET("/get").
+				WithHost("httpbin.external").
+				Expect().
+				Status(200)
+		})
 	})
 	Context("HTTPRoute Rule Match", func() {
 		var exactRouteByGet = `

test/e2e/ingress/ingress.go

@@ -158,6 +158,33 @@ spec:
               number: 80
 `
 
+		var ingressWithExternalName = `
+apiVersion: v1
+kind: Service
+metadata:
+  name: httpbin-external-domain
+spec:
+  type: ExternalName
+  externalName: httpbin.org
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: api7-ingress-default
+spec:
+  rules:
+  - host: httpbin.external
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: httpbin-external-domain
+            port:
+              number: 80
+`
+
 		It("Test IngressClass Selection", func() {
 			By("create GatewayProxy")
 			gatewayProxy := fmt.Sprintf(gatewayProxyYaml, framework.DashboardTLSEndpoint, s.AdminKey())
@@ -184,6 +211,33 @@ spec:
 				Expect().
 				Status(200)
 		})
+
+		It("Proxy external service", func() {
+			By("create GatewayProxy")
+			gatewayProxy := fmt.Sprintf(gatewayProxyYaml, framework.DashboardTLSEndpoint, s.AdminKey())
+
+			By("create GatewayProxy")
+			err := s.CreateResourceFromStringWithNamespace(gatewayProxy, "default")
+			Expect(err).NotTo(HaveOccurred(), "creating GatewayProxy")
+			time.Sleep(5 * time.Second)
+
+			By("create Default IngressClass")
+			err = s.CreateResourceFromStringWithNamespace(defaultIngressClass, "")
+			Expect(err).NotTo(HaveOccurred(), "creating Default IngressClass")
+			time.Sleep(5 * time.Second)
+
+			By("create Ingress")
+			err = s.CreateResourceFromString(ingressWithExternalName)
+			Expect(err).NotTo(HaveOccurred(), "creating Ingress without IngressClass")
+			time.Sleep(5 * time.Second)
+
+			By("checking the external service response")
+			s.NewAPISIXClient().
+				GET("/get").
+				WithHost("httpbin.external").
+				Expect().
+				Status(200)
+		})
 	})
 
 	Context("IngressClass with GatewayProxy", func() {