Fix issues with named ports

controllers/nginx/controller.go

@@ -17,6 +17,7 @@ limitations under the License.
 package main
 
 import (
+	"encoding/json"
 	"fmt"
 	"reflect"
 	"sort"
@@ -28,11 +29,13 @@ import (
 	"github.com/golang/glog"
 
 	"k8s.io/kubernetes/pkg/api"
+	podutil "k8s.io/kubernetes/pkg/api/pod"
 	"k8s.io/kubernetes/pkg/apis/extensions"
 	"k8s.io/kubernetes/pkg/client/cache"
 	"k8s.io/kubernetes/pkg/client/record"
 	client "k8s.io/kubernetes/pkg/client/unversioned"
 	"k8s.io/kubernetes/pkg/controller/framework"
+	"k8s.io/kubernetes/pkg/labels"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/util/intstr"
 	"k8s.io/kubernetes/pkg/watch"
@@ -43,12 +46,33 @@ import (
 const (
 	defUpstreamName     = "upstream-default-backend"
 	defServerName       = "_"
+	namedPortAnnotation = "kubernetes.io/ingress-named-ports"
 )
 
 var (
 	keyFunc = framework.DeletionHandlingMetaNamespaceKeyFunc
 )
 
+type namedPortMapping map[string]string
+
+func (npm namedPortMapping) getPort(name string) (string, bool) {
+	val, ok := npm.getMappings()[name]
+	return val, ok
+}
+
+func (npm namedPortMapping) getMappings() map[string]string {
+	data := npm[namedPortAnnotation]
+	var mapping map[string]string
+	if data == "" {
+		return mapping
+	}
+	if err := json.Unmarshal([]byte(data), &mapping); err != nil {
+		glog.Errorf("unexpected error reading annotations: %v", err)
+	}
+
+	return mapping
+}
+
 // loadBalancerController watches the kubernetes api and adds/removes services
 // from the loadbalancer
 type loadBalancerController struct {
@@ -74,6 +98,10 @@ type loadBalancerController struct {
 	// this avoids a sync execution in the ResourceEventHandlerFuncs
 	ingQueue *taskQueue
 
+	// used to update the annotation that matches a service using one or
+	// more named ports to an endpoint port
+	svcEpQueue *taskQueue
+
 	// stopLock is used to enforce only a single call to Stop is active.
 	// Needed because we allow stopping through an http endpoint and
 	// allowing concurrent stoppers leads to stack traces.
@@ -104,6 +132,7 @@ func newLoadBalancerController(kubeClient *client.Client, resyncPeriod time.Dura
 
 	lbc.syncQueue = NewTaskQueue(lbc.sync)
 	lbc.ingQueue = NewTaskQueue(lbc.updateIngressStatus)
+	lbc.svcEpQueue = NewTaskQueue(lbc.updateEpNamedPorts)
 
 	ingEventHandler := framework.ResourceEventHandlerFuncs{
 		AddFunc: func(obj interface{}) {
@@ -141,6 +170,17 @@ func newLoadBalancerController(kubeClient *client.Client, resyncPeriod time.Dura
 		},
 	}
 
+	svcEventHandler := framework.ResourceEventHandlerFuncs{
+		AddFunc: func(obj interface{}) {
+			lbc.svcEpQueue.enqueue(obj)
+		},
+		UpdateFunc: func(old, cur interface{}) {
+			if !reflect.DeepEqual(old, cur) {
+				lbc.svcEpQueue.enqueue(cur)
+			}
+		},
+	}
+
 	lbc.ingLister.Store, lbc.ingController = framework.NewInformer(
 		&cache.ListWatch{
 			ListFunc:  ingressListFunc(lbc.client, namespace),
@@ -160,7 +200,7 @@ func newLoadBalancerController(kubeClient *client.Client, resyncPeriod time.Dura
 			ListFunc:  serviceListFunc(lbc.client, namespace),
 			WatchFunc: serviceWatchFunc(lbc.client, namespace),
 		},
-		&api.Service{}, resyncPeriod, framework.ResourceEventHandlerFuncs{})
+		&api.Service{}, resyncPeriod, svcEventHandler)
 
 	return &lbc, nil
 }
@@ -217,6 +257,75 @@ func (lbc *loadBalancerController) getUDPConfigMap(ns, name string) (*api.Config
 	return lbc.client.ConfigMaps(ns).Get(name)
 }
 
+func (lbc *loadBalancerController) updateEpNamedPorts(key string) {
+	if !lbc.controllersInSync() {
+		lbc.svcEpQueue.requeue(key, fmt.Errorf("deferring sync till endpoints controller has synced"))
+		return
+	}
+
+	svcObj, svcExists, err := lbc.svcLister.GetByKey(key)
+	if err != nil {
+		glog.Warningf("error getting service %v: %v", key, err)
+		return
+	}
+
+	if !svcExists {
+		glog.Warningf("service %v not found", key)
+		return
+	}
+
+	svc := svcObj.(*api.Service)
+	if svc.Spec.Selector == nil {
+		return
+	}
+
+	pods, err := lbc.client.Pods(svc.Namespace).List(api.ListOptions{
+		LabelSelector: labels.Set(svc.Spec.Selector).AsSelector(),
+	})
+	if err != nil {
+		glog.Errorf("error searching service pods %q: %v", key, err)
+		return
+	}
+
+	namedPorts := map[string]string{}
+
+	for i := range pods.Items {
+		pod := &pods.Items[i]
+
+		for i := range svc.Spec.Ports {
+			servicePort := &svc.Spec.Ports[i]
+
+			_, err := strconv.Atoi(servicePort.TargetPort.StrVal)
+			if err != nil {
+				portNum, err := podutil.FindPort(pod, servicePort)
+				if err != nil {
+					glog.V(4).Infof("Failed to find port for service %s/%s: %v", svc.Namespace, svc.Name, err)
+					continue
+				}
+
+				if servicePort.TargetPort.StrVal == "" {
+					continue
+				}
+
+				namedPorts[servicePort.TargetPort.StrVal] = fmt.Sprintf("%v", portNum)
+			}
+		}
+	}
+
+	if !reflect.DeepEqual(svc.ObjectMeta.Annotations, namedPorts) {
+		data, _ := json.Marshal(namedPorts)
+		if svc.ObjectMeta.Annotations == nil {
+			svc.ObjectMeta.Annotations = map[string]string{}
+		}
+		svc.ObjectMeta.Annotations[namedPortAnnotation] = string(data)
+		glog.Infof("updating service %v with new named port mappings", svc.Name)
+		_, err := lbc.client.Services(svc.Namespace).Update(svc)
+		if err != nil {
+			glog.Errorf("Error syncing service %q: %v", key, err)
+		}
+	}
+}
+
 func (lbc *loadBalancerController) sync(key string) {
 	if !lbc.controllersInSync() {
 		lbc.syncQueue.requeue(key, fmt.Errorf("deferring sync till endpoints controller has synced"))
@@ -373,7 +482,12 @@ func (lbc *loadBalancerController) getServices(data map[string]string, proto api
 		var endps []nginx.UpstreamServer
 		targetPort, err := strconv.Atoi(svcPort[1])
 		if err != nil {
-			endps = lbc.getEndpoints(svc, intstr.FromString(svcPort[1]), proto)
+			for _, sp := range svc.Spec.Ports {
+				if sp.Name == svcPort[1] {
+					endps = lbc.getEndpoints(svc, sp.TargetPort, proto)
+					break
+				}
+			}
 		} else {
 			// we need to use the TargetPort (where the endpoints are running)
 			for _, sp := range svc.Spec.Ports {
@@ -461,7 +575,7 @@ func (lbc *loadBalancerController) getUpstreamServers(data []interface{}) ([]*ng
 
 			for _, path := range rule.HTTP.Paths {
 
-				upsName := fmt.Sprintf("%v-%v-%v", ing.GetNamespace(), path.Backend.ServiceName, path.Backend.ServicePort.IntValue())
+				upsName := fmt.Sprintf("%v-%v-%v", ing.GetNamespace(), path.Backend.ServiceName, path.Backend.ServicePort.StrVal)
 				ups := upstreams[upsName]
 
 				svcKey := fmt.Sprintf("%v/%v", ing.GetNamespace(), path.Backend.ServiceName)
@@ -479,8 +593,13 @@ func (lbc *loadBalancerController) getUpstreamServers(data []interface{}) ([]*ng
 				svc := svcObj.(*api.Service)
 
 				for _, servicePort := range svc.Spec.Ports {
-					if servicePort.Port == path.Backend.ServicePort.IntValue() {
-						endps := lbc.getEndpoints(svc, servicePort.TargetPort, api.ProtocolTCP)
+					port := servicePort.TargetPort
+					if servicePort.Name != "" {
+						port = intstr.FromString(servicePort.Name)
+					}
+
+					if port == path.Backend.ServicePort {
+						endps := lbc.getEndpoints(svc, port, api.ProtocolTCP)
 						if len(endps) == 0 {
 							glog.Warningf("service %v does no have any active endpoints", svcKey)
 						}
@@ -546,7 +665,7 @@ func (lbc *loadBalancerController) createUpstreams(data []interface{}) map[strin
 			}
 
 			for _, path := range rule.HTTP.Paths {
-				name := fmt.Sprintf("%v-%v-%v", ing.GetNamespace(), path.Backend.ServiceName, path.Backend.ServicePort.IntValue())
+				name := fmt.Sprintf("%v-%v-%v", ing.GetNamespace(), path.Backend.ServiceName, path.Backend.ServicePort.StrVal)
 				if _, ok := upstreams[name]; !ok {
 					upstreams[name] = nginx.NewUpstream(name)
 				}
@@ -666,8 +785,16 @@ func (lbc *loadBalancerController) getEndpoints(s *api.Service, servicePort ints
 					targetPort = epPort.Port
 				}
 			case intstr.String:
-				if epPort.Name == servicePort.StrVal {
-					targetPort = epPort.Port
+				if val, ok := namedPortMapping(s.ObjectMeta.Annotations).getPort(servicePort.StrVal); ok {
+					port, err := strconv.Atoi(val)
+					if err != nil {
+						glog.Warningf("%v is not valid as a port", val)
+						continue
+					}
+
+					if epPort.Protocol == proto {
+						targetPort = port
+					}
 				}
 			}
 
@@ -754,6 +881,7 @@ func (lbc *loadBalancerController) Run() {
 
 	go lbc.syncQueue.run(time.Second, lbc.stopCh)
 	go lbc.ingQueue.run(time.Second, lbc.stopCh)
+	go lbc.svcEpQueue.run(time.Second, lbc.stopCh)
 
 	<-lbc.stopCh
 	glog.Infof("shutting down NGINX loadbalancer controller")