Istio: add gateway-virtualservice link

tests/istio/gateway-virtualservice.yaml

@@ -0,0 +1,29 @@
+apiVersion: networking.istio.io/v1alpha3
+kind: Gateway
+metadata:
+  name: skydive-test-gateway-virtualservice
+spec:
+  selector:
+    istio: ingressgateway 
+  servers:
+  - port:
+      number: 80
+      name: http
+      protocol: HTTP
+    hosts:
+    - "*"
+---
+apiVersion: networking.istio.io/v1alpha3
+kind: VirtualService
+metadata:
+  name: skydive-test-gateway-virtualservice
+spec:
+  hosts:
+  - reviews.prod.svc.cluster.local
+  gateways:
+  - skydive-test-gateway-virtualservice
+  http:
+  - route:
+    - destination:
+        host: reviews.prod.svc.cluster.local
+        subset: v1

tests/istio_test.go

@@ -104,6 +104,32 @@ func TestIstioDestinationRuleServiceScenario(t *testing.T) {
 	)
 }
 
+func TestIstioGatewayVirtualServiceScenario(t *testing.T) {
+	file := "gateway-virtualservice"
+	name := objName + "-" + file
+	testRunner(
+		t,
+		setupFromConfigFile(istio.Manager, file),
+		tearDownFromConfigFile(istio.Manager, file),
+		[]CheckFunction{
+			func(c *CheckContext) error {
+				gateway, err := checkNodeCreation(t, c, istio.Manager, "gateway", name)
+				if err != nil {
+					return err
+				}
+				virtualservice, err := checkNodeCreation(t, c, istio.Manager, "virtualservice", name)
+				if err != nil {
+					return err
+				}
+				if err = checkEdge(t, c, gateway, virtualservice, "gateway"); err != nil {
+					return err
+				}
+				return nil
+			},
+		},
+	)
+}
+
 func TestBookInfoScenario(t *testing.T) {
 	bookinfo := "WITH_ISTIO=true ./bookinfo/bookinfo.sh"
 	testRunner(

topology/probes/istio/gateway.go

@@ -22,6 +22,7 @@ import (
 
 	kiali "github.com/kiali/kiali/kubernetes"
 	"github.com/skydive-project/skydive/graffiti/graph"
+	"github.com/skydive-project/skydive/probe"
 	"github.com/skydive-project/skydive/topology/probes/k8s"
 )
 
@@ -44,3 +45,21 @@ func (h *gatewayHandler) Dump(obj interface{}) string {
 func newGatewayProbe(client interface{}, g *graph.Graph) k8s.Subprobe {
 	return k8s.NewResourceCache(client.(*kiali.IstioClient).GetIstioNetworkingApi(), &kiali.Gateway{}, "gateways", g, &gatewayHandler{})
 }
+
+func gatewayVirtualServiceAreLinked(a, b interface{}) bool {
+	gateway := a.(*kiali.Gateway)
+	vs := b.(*kiali.VirtualService)
+	if gateways, ok := vs.Spec["gateways"]; ok {
+		gatewaysList := gateways.([]interface{})
+		for _, g := range gatewaysList {
+			if g.(string) == gateway.Name {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func newGatewayVirtualServiceLinker(g *graph.Graph) probe.Probe {
+	return k8s.NewABLinker(g, Manager, "gateway", Manager, "virtualservice", gatewayVirtualServiceAreLinked)
+}

topology/probes/istio/istio.go

@@ -61,6 +61,7 @@ func NewIstioProbe(g *graph.Graph) (*k8s.Probe, error) {
 	linkerHandlers := []k8s.LinkHandler{
 		newVirtualServicePodLinker,
 		newDestinationRuleServiceLinker,
+		newGatewayVirtualServiceLinker,
 	}
 
 	linkers := k8s.InitLinkers(linkerHandlers, g)