Remove etcd dependency from controller manager.

cmd/controller-manager/controller-manager.go

@@ -14,11 +14,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// The controller manager is responsible for monitoring replication controllers, and creating corresponding
-// pods to achieve the desired state.  It listens for new controllers in etcd, and it sends requests to the
-// master to create/delete pods.
-//
-// TODO: Refactor the etcd watch code so that it is a pluggable interface.
+// The controller manager is responsible for monitoring replication
+// controllers, and creating corresponding pods to achieve the desired
+// state.  It uses the API to listen for new controllers and to create/delete
+// pods.
 package main
 
 import (
@@ -29,19 +28,13 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/controller"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	verflag "github.com/GoogleCloudPlatform/kubernetes/pkg/version/flag"
-	"github.com/coreos/go-etcd/etcd"
 	"github.com/golang/glog"
 )
 
 var (
-	etcdServerList util.StringList
-	master         = flag.String("master", "", "The address of the Kubernetes API server")
+	master = flag.String("master", "", "The address of the Kubernetes API server")
 )
 
-func init() {
-	flag.Var(&etcdServerList, "etcd_servers", "List of etcd servers to watch (http://ip:port), comma separated")
-}
-
 func main() {
 	flag.Parse()
 	util.InitLogs()
@@ -49,15 +42,11 @@ func main() {
 
 	verflag.PrintAndExitIfRequested()
 
-	if len(etcdServerList) == 0 || len(*master) == 0 {
-		glog.Fatal("usage: controller-manager -etcd_servers <servers> -master <master>")
+	if len(*master) == 0 {
+		glog.Fatal("usage: controller-manager -master <master>")
 	}
 
-	// Set up logger for etcd client
-	etcd.SetLogger(util.NewLogger("etcd "))
-
 	controllerManager := controller.MakeReplicationManager(
-		etcd.NewClient(etcdServerList),
 		client.New("http://"+*master, nil))
 
 	controllerManager.Run(10 * time.Second)

cmd/integration/integration.go

@@ -103,7 +103,7 @@ func startComponents(manifestURL string) (apiServerURL string) {
 	})
 	handler.delegate = m.ConstructHandler("/api/v1beta1")
 
-	controllerManager := controller.MakeReplicationManager(etcdClient, cl)
+	controllerManager := controller.MakeReplicationManager(cl)
 
 	// Prove that controllerManager's watch works by making it not sync until after this
 	// test is over. (Hopefully we don't take 10 minutes!)

pkg/controller/replication_controller.go

@@ -23,18 +23,14 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/tools"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 	"github.com/golang/glog"
 )
 
-// ReplicationManager is responsible for synchronizing ReplicationController objects stored in etcd
-// with actual running pods.
-// TODO: Allow choice of switching between etcd/apiserver watching, or remove etcd references
-// from this file completely.
+// ReplicationManager is responsible for synchronizing ReplicationController objects stored
+// in the system with actual running pods.
 type ReplicationManager struct {
-	etcdHelper tools.EtcdHelper
 	kubeClient client.Interface
 	podControl PodControlInterface
 	syncTime   <-chan time.Time
@@ -81,10 +77,9 @@ func (r RealPodControl) deletePod(podID string) error {
 }
 
 // MakeReplicationManager creates a new ReplicationManager.
-func MakeReplicationManager(etcdClient tools.EtcdClient, kubeClient client.Interface) *ReplicationManager {
+func MakeReplicationManager(kubeClient client.Interface) *ReplicationManager {
 	rm := &ReplicationManager{
 		kubeClient: kubeClient,
-		etcdHelper: tools.EtcdHelper{etcdClient, api.Encoding, api.Versioning},
 		podControl: RealPodControl{
 			kubeClient: kubeClient,
 		},
@@ -100,11 +95,6 @@ func (rm *ReplicationManager) Run(period time.Duration) {
 	go util.Forever(func() { rm.watchControllers() }, period)
 }
 
-// makeEtcdWatch starts watching via etcd.
-func (rm *ReplicationManager) makeEtcdWatch() (watch.Interface, error) {
-	return rm.etcdHelper.WatchList("/registry/controllers", tools.Everything)
-}
-
 // makeAPIWatch starts watching via the apiserver.
 func (rm *ReplicationManager) makeAPIWatch() (watch.Interface, error) {
 	// TODO: Fix this ugly type assertion.
@@ -190,12 +180,15 @@ func (rm *ReplicationManager) syncReplicationController(controllerSpec api.Repli
 }
 
 func (rm *ReplicationManager) synchronize() {
+	// TODO: remove this method completely and rely on the watch.
+	// Add resource version tracking to watch to make this work.
 	var controllerSpecs []api.ReplicationController
-	err := rm.etcdHelper.ExtractList("/registry/controllers", &controllerSpecs)
+	list, err := rm.kubeClient.ListReplicationControllers(labels.Everything())
 	if err != nil {
 		glog.Errorf("Synchronization error: %v (%#v)", err, err)
 		return
 	}
+	controllerSpecs = list.Items
 	wg := sync.WaitGroup{}
 	wg.Add(len(controllerSpecs))
 	for ix := range controllerSpecs {

pkg/controller/replication_controller_test.go

@@ -19,6 +19,7 @@ package controller
 import (
 	"encoding/json"
 	"fmt"
+	"net/http"
 	"net/http/httptest"
 	"reflect"
 	"sync"
@@ -116,7 +117,7 @@ func TestSyncReplicationControllerDoesNothing(t *testing.T) {
 
 	fakePodControl := FakePodControl{}
 
-	manager := MakeReplicationManager(nil, client)
+	manager := MakeReplicationManager(client)
 	manager.podControl = &fakePodControl
 
 	controllerSpec := makeReplicationController(2)
@@ -136,7 +137,7 @@ func TestSyncReplicationControllerDeletes(t *testing.T) {
 
 	fakePodControl := FakePodControl{}
 
-	manager := MakeReplicationManager(nil, client)
+	manager := MakeReplicationManager(client)
 	manager.podControl = &fakePodControl
 
 	controllerSpec := makeReplicationController(1)
@@ -156,7 +157,7 @@ func TestSyncReplicationControllerCreates(t *testing.T) {
 
 	fakePodControl := FakePodControl{}
 
-	manager := MakeReplicationManager(nil, client)
+	manager := MakeReplicationManager(client)
 	manager.podControl = &fakePodControl
 
 	controllerSpec := makeReplicationController(2)
@@ -282,14 +283,31 @@ func TestSyncronize(t *testing.T) {
 		},
 	}
 
-	fakeHandler := util.FakeHandler{
+	fakePodHandler := util.FakeHandler{
 		StatusCode:   200,
 		ResponseBody: "{\"apiVersion\": \"v1beta1\", \"kind\": \"PodList\"}",
 		T:            t,
 	}
-	testServer := httptest.NewTLSServer(&fakeHandler)
+	fakeControllerHandler := util.FakeHandler{
+		StatusCode: 200,
+		ResponseBody: api.EncodeOrDie(&api.ReplicationControllerList{
+			Items: []api.ReplicationController{
+				controllerSpec1,
+				controllerSpec2,
+			},
+		}),
+		T: t,
+	}
+	mux := http.NewServeMux()
+	mux.Handle("/api/v1beta1/pods/", &fakePodHandler)
+	mux.Handle("/api/v1beta1/replicationControllers/", &fakeControllerHandler)
+	mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+		t.Errorf("Unexpected request for %v", req.RequestURI)
+	})
+	testServer := httptest.NewTLSServer(mux)
 	client := client.New(testServer.URL, nil)
-	manager := MakeReplicationManager(fakeEtcd, client)
+	manager := MakeReplicationManager(client)
 	fakePodControl := FakePodControl{}
 	manager.podControl = &fakePodControl
 
@@ -299,9 +317,8 @@ func TestSyncronize(t *testing.T) {
 }
 
 func TestWatchControllers(t *testing.T) {
-	fakeEtcd := tools.MakeFakeEtcdClient(t)
 	fakeWatcher := watch.NewFake()
-	manager := MakeReplicationManager(fakeEtcd, nil)
+	manager := MakeReplicationManager(nil)
 	manager.watchMaker = func() (watch.Interface, error) {
 		return fakeWatcher, nil
 	}