Use maven to build kube2msb

Issue-Id: OOM-61
Change-Id: Ic7e733c95e28b75b66535b343ae22c893db24531
Signed-off-by: HuabingZhao <zhao.huabing@zte.com.cn>

1 files changed, 288 insertions, 0 deletions

diff --git a/src/kube2msb/kube2msb.go b/src/kube2msb/kube2msb.go
new file mode 100644
index 0000000..627405e
--- /dev/null
+++ b/src/kube2msb/kube2msb.go
@@ -0,0 +1,288 @@
+/*
+Copyright 2017 ZTE, Inc. and others.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/url"
+	"os"
+	"reflect"
+	"time"
+
+	kapi "k8s.io/kubernetes/pkg/api"
+	kcache "k8s.io/kubernetes/pkg/client/cache"
+	kclient "k8s.io/kubernetes/pkg/client/unversioned"
+	kclientcmd "k8s.io/kubernetes/pkg/client/unversioned/clientcmd"
+	kframework "k8s.io/kubernetes/pkg/controller/framework"
+	kselector "k8s.io/kubernetes/pkg/fields"
+	klabels "k8s.io/kubernetes/pkg/labels"
+)
+
+var (
+	argMSBUrl        = flag.String("msb_url", "", "URL to MSB backend")
+	argKubeMasterUrl = flag.String("kube_master_url", "", "Url to reach kubernetes master. Env variables in this flag will be expanded.")
+	addMap           = make(map[string]*kapi.Pod)
+	deleteMap        = make(map[string]*kapi.Pod)
+	nodeSelector     = klabels.Everything()
+)
+
+const resyncPeriod = 5 * time.Second
+
+func getMSBUrl() (string, error) {
+	if *argMSBUrl == "" {
+		return "", fmt.Errorf("no --msb_url specified")
+	}
+	parsedUrl, err := url.Parse(os.ExpandEnv(*argMSBUrl))
+	if err != nil {
+		return "", fmt.Errorf("failed to parse --msb_url %s - %v", *argMSBUrl, err)
+	}
+	if parsedUrl.Scheme == "" || parsedUrl.Host == "" || parsedUrl.Host == ":" {
+		return "", fmt.Errorf("invalid --msb_url specified %s", *argMSBUrl)
+	}
+	return parsedUrl.String(), nil
+}
+
+func newMSBClient() (Client, error) {
+	msbUrl, err := getMSBUrl()
+	if err != nil {
+		return nil, err
+	}
+
+	client, err := newMSBAgent(msbUrl)
+	if err != nil {
+		return nil, err
+	}
+	return client, nil
+}
+
+func getKubeMasterUrl() (string, error) {
+	if *argKubeMasterUrl == "" {
+		return "", fmt.Errorf("no --kube_master_url specified")
+	}
+	parsedUrl, err := url.Parse(os.ExpandEnv(*argKubeMasterUrl))
+	if err != nil {
+		return "", fmt.Errorf("failed to parse --kube_master_url %s - %v", *argKubeMasterUrl, err)
+	}
+	if parsedUrl.Scheme == "" || parsedUrl.Host == "" || parsedUrl.Host == ":" {
+		return "", fmt.Errorf("invalid --kube_master_url specified %s", *argKubeMasterUrl)
+	}
+	return parsedUrl.String(), nil
+}
+
+func newKubeClient() (*kclient.Client, error) {
+	masterUrl, err := getKubeMasterUrl()
+	if err != nil {
+		return nil, err
+	}
+	overrides := &kclientcmd.ConfigOverrides{}
+	overrides.ClusterInfo.Server = masterUrl
+
+	rules := kclientcmd.NewDefaultClientConfigLoadingRules()
+	kubeConfig, err := kclientcmd.NewNonInteractiveDeferredLoadingClientConfig(rules, overrides).ClientConfig()
+
+	if err != nil {
+		log.Println("Error creating Kube Config", err)
+		return nil, err
+	}
+	kubeConfig.Host = masterUrl
+
+	log.Printf("Using %s for kubernetes master", kubeConfig.Host)
+	return kclient.New(kubeConfig)
+}
+
+// Returns a cache.ListWatch that gets all changes to services.
+func createServiceLW(kubeClient *kclient.Client) *kcache.ListWatch {
+	return kcache.NewListWatchFromClient(kubeClient, "services", kapi.NamespaceAll, kselector.Everything())
+}
+
+func sendServiceWork(action KubeWorkAction, queue chan<- KubeWork, serviceObj interface{}) {
+	if service, ok := serviceObj.(*kapi.Service); ok {
+		log.Println("Service Action: ", action, " for service ", service.Name)
+		queue <- KubeWork{
+			Action:  action,
+			Service: service,
+		}
+	}
+}
+
+func watchForServices(kubeClient *kclient.Client, queue chan<- KubeWork) {
+	_, svcController := kframework.NewInformer(
+		createServiceLW(kubeClient),
+		&kapi.Service{},
+		resyncPeriod,
+		kframework.ResourceEventHandlerFuncs{
+			AddFunc: func(obj interface{}) {
+				sendServiceWork(KubeWorkAddService, queue, obj)
+			},
+			DeleteFunc: func(obj interface{}) {
+				sendServiceWork(KubeWorkRemoveService, queue, obj)
+			},
+			UpdateFunc: func(oldObj, newObj interface{}) {
+				if reflect.DeepEqual(newObj, oldObj) == false {
+					sendServiceWork(KubeWorkUpdateService, queue, newObj)
+				}
+			},
+		},
+	)
+	stop := make(chan struct{})
+	go svcController.Run(stop)
+}
+
+// Returns a cache.ListWatch that gets all changes to Pods.
+func createPodLW(kubeClient *kclient.Client) *kcache.ListWatch {
+	return kcache.NewListWatchFromClient(kubeClient, "pods", kapi.NamespaceAll, kselector.Everything())
+}
+
+// Dispatch the notifications for Pods by type to the worker
+func sendPodWork(action KubeWorkAction, queue chan<- KubeWork, podObj interface{}) {
+	if pod, ok := podObj.(*kapi.Pod); ok {
+		log.Println("Pod Action: ", action, " for Pod:", pod.Name)
+		queue <- KubeWork{
+			Action: action,
+			Pod:    pod,
+		}
+	}
+}
+
+// Launch the go routine to watch notifications for Pods.
+func watchForPods(kubeClient *kclient.Client, queue chan<- KubeWork) {
+	var podController *kframework.Controller
+	_, podController = kframework.NewInformer(
+		createPodLW(kubeClient),
+		&kapi.Pod{},
+		resyncPeriod,
+		kframework.ResourceEventHandlerFuncs{
+			AddFunc: func(obj interface{}) {
+				sendPodWork(KubeWorkAddPod, queue, obj)
+			},
+			DeleteFunc: func(obj interface{}) {
+				if o, ok := obj.(*kapi.Pod); ok {
+					if _, ok := deleteMap[o.Name]; ok {
+						delete(deleteMap, o.Name)
+					}
+				}
+				sendPodWork(KubeWorkRemovePod, queue, obj)
+			},
+			UpdateFunc: func(oldObj, newObj interface{}) {
+				o, n := oldObj.(*kapi.Pod), newObj.(*kapi.Pod)
+				if reflect.DeepEqual(oldObj, newObj) == false {
+					//Adding Pod
+					if _, ok := addMap[n.Name]; ok {
+						if kapi.IsPodReady(n) {
+							delete(addMap, n.Name)
+							sendPodWork(KubeWorkUpdatePod, queue, newObj)
+						}
+						return
+					}
+					//Deleting Pod
+					if _, ok := deleteMap[n.Name]; ok {
+						return
+					} else {
+						if o.ObjectMeta.DeletionTimestamp == nil &&
+							n.ObjectMeta.DeletionTimestamp != nil {
+							deleteMap[n.Name] = n
+							return
+						}
+						//Updating Pod
+						sendPodWork(KubeWorkUpdatePod, queue, newObj)
+					}
+				}
+			},
+		},
+	)
+	stop := make(chan struct{})
+	go podController.Run(stop)
+}
+
+func runBookKeeper(workQue <-chan KubeWork, msbQueue chan<- MSBWork) {
+
+	client := newClientBookKeeper()
+	client.msbQueue = msbQueue
+
+	for work := range workQue {
+		switch work.Action {
+		case KubeWorkAddService:
+			client.AddService(work.Service)
+		case KubeWorkRemoveService:
+			client.RemoveService(work.Service)
+		case KubeWorkUpdateService:
+			client.UpdateService(work.Service)
+		case KubeWorkAddPod:
+			client.AddPod(work.Pod)
+		case KubeWorkRemovePod:
+			client.RemovePod(work.Pod)
+		case KubeWorkUpdatePod:
+			client.UpdatePod(work.Pod)
+		default:
+			log.Println("Unsupported work action: ", work.Action)
+		}
+	}
+	log.Println("Completed all work")
+}
+
+func runMSBWorker(queue <-chan MSBWork, client Client) {
+	worker := newMSBAgentWorker(client)
+
+	for work := range queue {
+		log.Println("MSB Work Action: ", work.Action, " ServiceInfo:", work.ServiceInfo)
+
+		switch work.Action {
+		case MSBWorkAddService:
+			worker.AddService(work.IPAddress, work.ServiceInfo)
+		case MSBWorkRemoveService:
+			worker.RemoveService(work.IPAddress, work.ServiceInfo)
+		case MSBWorkAddPod:
+			worker.AddPod(work.IPAddress, work.ServiceInfo)
+		case MSBWorkRemovePod:
+			worker.RemovePod(work.IPAddress, work.ServiceInfo)
+		default:
+			log.Println("Unsupported Action of: ", work.Action)
+		}
+	}
+}
+
+func main() {
+	flag.Parse()
+	var err error
+
+	msbClient, err := newMSBClient()
+	if err != nil {
+		log.Fatalf("Failed to create MSB client - %v", err)
+	}
+
+	kubeClient, err := newKubeClient()
+	if err != nil {
+		log.Fatalf("Failed to create a kubernetes client: %v", err)
+	}
+
+	if _, err := kubeClient.ServerVersion(); err != nil {
+		log.Fatal("Could not connect to Kube Master", err)
+	} else {
+		log.Println("Connected to K8S API Server")
+	}
+
+	kubeWorkQueue := make(chan KubeWork)
+	msbWorkQueue := make(chan MSBWork)
+	go runBookKeeper(kubeWorkQueue, msbWorkQueue)
+	watchForServices(kubeClient, kubeWorkQueue)
+	watchForPods(kubeClient, kubeWorkQueue)
+	go runMSBWorker(msbWorkQueue, msbClient)
+
+	// Prevent exit
+	select {}
+}