add kubernetes registry back since its being used...

cmd/cmd.go

@@ -24,6 +24,7 @@ import (
 	// registries
 	"github.com/myodc/go-micro/registry/consul"
 	"github.com/myodc/go-micro/registry/etcd"
+	"github.com/myodc/go-micro/registry/kubernetes"
 	"github.com/myodc/go-micro/registry/memory"
 
 	// transport
@@ -60,7 +61,7 @@ var (
 			Name:   "broker",
 			EnvVar: "MICRO_BROKER",
 			Value:  "http",
-			Usage:  "Broker for pub/sub. http, nats, etc",
+			Usage:  "Broker for pub/sub. http, nats, rabbitmq",
 		},
 		cli.StringFlag{
 			Name:   "broker_address",
@@ -71,7 +72,7 @@ var (
 			Name:   "registry",
 			EnvVar: "MICRO_REGISTRY",
 			Value:  "consul",
-			Usage:  "Registry for discovery. memory, consul, etcd",
+			Usage:  "Registry for discovery. memory, consul, etcd, kubernetes",
 		},
 		cli.StringFlag{
 			Name:   "registry_address",
@@ -82,7 +83,7 @@ var (
 			Name:   "transport",
 			EnvVar: "MICRO_TRANSPORT",
 			Value:  "http",
-			Usage:  "Transport mechanism used; http, rabbitmq, etc",
+			Usage:  "Transport mechanism used; http, rabbitmq, nats",
 		},
 		cli.StringFlag{
 			Name:   "transport_address",
@@ -128,9 +129,10 @@ var (
 	}
 
 	Registries = map[string]func([]string, ...registry.Option) registry.Registry{
-		"consul": consul.NewRegistry,
-		"etcd":   etcd.NewRegistry,
-		"memory": memory.NewRegistry,
+		"consul":     consul.NewRegistry,
+		"etcd":       etcd.NewRegistry,
+		"kubernetes": kubernetes.NewRegistry,
+		"memory":     memory.NewRegistry,
 	}
 
 	Transports = map[string]func([]string, ...transport.Option) transport.Transport{

registry/kubernetes/kubernetes.go

@@ -0,0 +1,117 @@
+package kubernetes
+
+import (
+	"fmt"
+	"os"
+	"sync"
+
+	"github.com/myodc/go-micro/registry"
+
+	k8s "k8s.io/kubernetes/pkg/client/unversioned"
+	"k8s.io/kubernetes/pkg/labels"
+)
+
+type kregistry struct {
+	client    *k8s.Client
+	namespace string
+
+	mtx      sync.RWMutex
+	services map[string]*registry.Service
+}
+
+func (c *kregistry) Deregister(s *registry.Service) error {
+	return nil
+}
+
+func (c *kregistry) Register(s *registry.Service) error {
+	return nil
+}
+
+func (c *kregistry) GetService(name string) (*registry.Service, error) {
+	c.mtx.RLock()
+	svc, ok := c.services[name]
+	c.mtx.RUnlock()
+
+	if ok {
+		return svc, nil
+	}
+
+	selector := labels.SelectorFromSet(labels.Set{"name": name})
+
+	services, err := c.client.Services(c.namespace).List(selector)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(services.Items) == 0 {
+		return nil, fmt.Errorf("Service not found")
+	}
+
+	ks := &registry.Service{
+		Name: name,
+	}
+
+	for _, item := range services.Items {
+		ks.Nodes = append(ks.Nodes, &registry.Node{
+			Address: item.Spec.ClusterIP,
+			Port:    item.Spec.Ports[0].Port,
+		})
+	}
+
+	return ks, nil
+}
+
+func (c *kregistry) ListServices() ([]*registry.Service, error) {
+	c.mtx.RLock()
+	serviceMap := c.services
+	c.mtx.RUnlock()
+
+	var services []*registry.Service
+
+	if len(serviceMap) > 0 {
+		for _, service := range serviceMap {
+			services = append(services, service)
+		}
+		return services, nil
+	}
+
+	rsp, err := c.client.Services(c.namespace).List(labels.Everything())
+	if err != nil {
+		return nil, err
+	}
+
+	for _, svc := range rsp.Items {
+		if len(svc.ObjectMeta.Labels["name"]) == 0 {
+			continue
+		}
+
+		services = append(services, &registry.Service{
+			Name: svc.ObjectMeta.Labels["name"],
+		})
+	}
+
+	return services, nil
+}
+
+func (c *kregistry) Watch() (registry.Watcher, error) {
+	return newWatcher(c)
+}
+
+func NewRegistry(addrs []string, opts ...registry.Option) registry.Registry {
+	host := "http://" + os.Getenv("KUBERNETES_RO_SERVICE_HOST") + ":" + os.Getenv("KUBERNETES_RO_SERVICE_PORT")
+	if len(addrs) > 0 {
+		host = addrs[0]
+	}
+
+	client, _ := k8s.New(&k8s.Config{
+		Host: host,
+	})
+
+	kr := &kregistry{
+		client:    client,
+		namespace: "default",
+		services:  make(map[string]*registry.Service),
+	}
+
+	return kr
+}

registry/kubernetes/watcher.go

@@ -0,0 +1,91 @@
+package kubernetes
+
+import (
+	"net"
+
+	"github.com/myodc/go-micro/registry"
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+type watcher struct {
+	registry *kregistry
+	watcher  watch.Interface
+}
+
+func (k *watcher) update(event watch.Event) {
+	if event.Object == nil {
+		return
+	}
+
+	var service *api.Service
+	switch obj := event.Object.(type) {
+	case *api.Service:
+		service = obj
+	default:
+		return
+	}
+
+	name, exists := service.ObjectMeta.Labels["name"]
+	if !exists {
+		return
+	}
+
+	switch event.Type {
+	case watch.Added, watch.Modified:
+	case watch.Deleted:
+		k.registry.mtx.Lock()
+		delete(k.registry.services, name)
+		k.registry.mtx.Unlock()
+		return
+	default:
+		return
+	}
+
+	serviceIP := net.ParseIP(service.Spec.ClusterIP)
+
+	k.registry.mtx.Lock()
+	k.registry.services[name] = &registry.Service{
+		Name: name,
+		Nodes: []*registry.Node{
+			&registry.Node{
+				Address: serviceIP.String(),
+				Port:    service.Spec.Ports[0].Port,
+			},
+		},
+	}
+	k.registry.mtx.Unlock()
+}
+
+func (k *watcher) Stop() {
+	k.watcher.Stop()
+}
+
+func newWatcher(kr *kregistry) (registry.Watcher, error) {
+	svi := kr.client.Services(api.NamespaceAll)
+
+	services, err := svi.List(labels.Everything())
+	if err != nil {
+		return nil, err
+	}
+
+	watch, err := svi.Watch(labels.Everything(), fields.Everything(), services.ResourceVersion)
+	if err != nil {
+		return nil, err
+	}
+
+	w := &watcher{
+		registry: kr,
+		watcher:  watch,
+	}
+
+	go func() {
+		for event := range watch.ResultChan() {
+			w.update(event)
+		}
+	}()
+
+	return w, nil
+}