Fix incorrect behaviour with multi-port endpoint subsets

pkg/provider/kubernetes/ingress/fixtures/Ingress-with-a-named-port-matching-subset-of-service-pods_endpoint.yml

@@ -0,0 +1,20 @@
+kind: Endpoints
+apiVersion: v1
+metadata:
+  name: service1
+  namespace: testing
+
+subsets:
+  - addresses:
+      - ip: 10.10.0.1
+      - ip: 10.10.0.2
+    ports:
+      - name: tchouk
+        port: 8089
+  - addresses:
+      - ip: 10.10.0.1
+      - ip: 10.10.0.2
+      - ip: 10.10.0.3
+    ports:
+      - name: carotte
+        port: 8090

pkg/provider/kubernetes/ingress/fixtures/Ingress-with-a-named-port-matching-subset-of-service-pods_ingress.yml

@@ -0,0 +1,15 @@
+kind: Ingress
+apiVersion: networking.k8s.io/v1beta1
+metadata:
+  name: ""
+  namespace: testing
+
+spec:
+  rules:
+    - host: traefik.tchouk
+      http:
+        paths:
+          - path: /bar
+            backend:
+              serviceName: service1
+              servicePort: tchouk

pkg/provider/kubernetes/ingress/fixtures/Ingress-with-a-named-port-matching-subset-of-service-pods_service.yml

@@ -0,0 +1,14 @@
+kind: Service
+apiVersion: v1
+metadata:
+  name: service1
+  namespace: testing
+
+spec:
+  ports:
+    - name: carotte
+      port: 8082
+    - name: tchouk
+      port: 80
+  clusterIP: 10.0.0.1
+

pkg/provider/kubernetes/ingress/kubernetes.go

@@ -529,8 +529,8 @@ func loadService(client Client, namespace string, backend networkingv1beta1.Ingr
 		return nil, errors.New("subset not found")
 	}
 
-	var port int32
 	for _, subset := range endpoints.Subsets {
+		var port int32
 		for _, p := range subset.Ports {
 			if portName == p.Name {
 				port = p.Port

pkg/provider/kubernetes/ingress/kubernetes_test.go

@@ -633,6 +633,36 @@ func TestLoadConfigurationFromIngresses(t *testing.T) {
 				},
 			},
 		},
+		{
+			desc: "Ingress with a named port matching subset of service pods",
+			expected: &dynamic.Configuration{
+				TCP: &dynamic.TCPConfiguration{},
+				HTTP: &dynamic.HTTPConfiguration{
+					Middlewares: map[string]*dynamic.Middleware{},
+					Routers: map[string]*dynamic.Router{
+						"testing-traefik-tchouk-bar": {
+							Rule:    "Host(`traefik.tchouk`) && PathPrefix(`/bar`)",
+							Service: "testing-service1-tchouk",
+						},
+					},
+					Services: map[string]*dynamic.Service{
+						"testing-service1-tchouk": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								PassHostHeader: Bool(true),
+								Servers: []dynamic.Server{
+									{
+										URL: "http://10.10.0.1:8089",
+									},
+									{
+										URL: "http://10.10.0.2:8089",
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
 		{
 			desc: "2 ingresses in different namespace with same service name",
 			expected: &dynamic.Configuration{