Port embedded etcd to embed API

This also updates the vendored version of etcd to current git master,
which is the only place this is supported at the moment.

etcd.go

@@ -60,7 +60,7 @@ import (
 	"time"
 
 	etcd "github.com/coreos/etcd/clientv3" // "clientv3"
-	"github.com/coreos/etcd/etcdmain"
+	"github.com/coreos/etcd/embed"
 	"github.com/coreos/etcd/etcdserver"
 	rpctypes "github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
 	etcdtypes "github.com/coreos/etcd/pkg/types"
@@ -176,8 +176,7 @@ type EmbdEtcd struct { // EMBeddeD etcd
 
 	// etcd server related
 	serverwg sync.WaitGroup // wait for server to shutdown
-	etcdConn *etcdmain.EtcdConn
-	server   *etcdserver.EtcdServer
+	server   *embed.Etcd    // technically this contains the server struct
 	dataDir  string         // XXX: incorporate into the "/var" functionality...
 }
 
@@ -280,11 +279,19 @@ func (obj *EmbdEtcd) Connect(reconnect bool) error {
 		}
 		obj.client, err = etcd.New(cfg) // connect!
 		if err != nil {
+			log.Printf("Etcd: Connect: CtxError...")
 			if _, e := obj.CtxError(context.TODO(), err); e != nil {
+				log.Printf("Etcd: Connect: CtxError: Fatal: %v", e)
 				return e // fatal error
 			}
 			continue
 		}
+		// check if we're actually connected here, because this must
+		// block if we're not connected
+		if obj.client == nil {
+			log.Printf("Etcd: Connect: Is nil!")
+			continue
+		}
 		break
 	}
 	return nil
@@ -361,7 +368,9 @@ func (obj *EmbdEtcd) Startup() error {
 
 	go obj.AddWatcher(fmt.Sprintf("/%s/endpoints/", NS), obj.endpointCallback, true, etcd.WithPrefix())
 
-	obj.Connect(false) // don't exit from this Startup function until connected!
+	if e := obj.Connect(false); e != nil { // don't exit from this Startup function until connected!
+		return e
+	}
 	return nil
 }
 
@@ -585,7 +594,7 @@ func (obj *EmbdEtcd) CtxError(ctx context.Context, err error) (context.Context,
 		obj.cancelLock.Unlock()
 
 		log.Printf("Etcd: CtxError: Reconnecting...")
-		obj.Connect(true)
+		obj.Connect(true) // FIXME: check returned error
 		if DEBUG {
 			log.Printf("Etcd: CtxError: Unlocking...")
 		}
@@ -614,7 +623,9 @@ func (obj *EmbdEtcd) CtxError(ctx context.Context, err error) (context.Context,
 func (obj *EmbdEtcd) CallbackLoop() {
 	cuuid := obj.converger.Register()
 	defer cuuid.Unregister()
-	obj.Connect(false)
+	if e := obj.Connect(false); e != nil {
+		return // fatal
+	}
 	for {
 		ctx := context.Background() // TODO: inherit as input argument?
 		select {
@@ -664,7 +675,9 @@ func (obj *EmbdEtcd) CallbackLoop() {
 func (obj *EmbdEtcd) Loop() {
 	cuuid := obj.converger.Register()
 	defer cuuid.Unregister()
-	obj.Connect(false)
+	if e := obj.Connect(false); e != nil {
+		return // fatal
+	}
 	for {
 		ctx := context.Background() // TODO: inherit as input argument?
 		// priority channel...
@@ -1071,7 +1084,7 @@ func (obj *EmbdEtcd) volunteerCallback(re *RE) error {
 		log.Printf("Trace: Etcd: volunteerCallback()")
 		defer log.Printf("Trace: Etcd: volunteerCallback(): Finished!")
 	}
-	obj.Connect(false)
+	obj.Connect(false) // FIXME: check return error
 	var err error
 
 	// FIXME: if this is running in response to our OWN volunteering offer,
@@ -1526,47 +1539,31 @@ func (obj *EmbdEtcd) StartServer(newCluster bool, peerURLsMap etcdtypes.URLsMap)
 		initialPeerURLsMap[memberName] = peerURLs
 	}
 
-	obj.etcdConn = etcdmain.NewEtcdConn(
-		false, false, // TODO: for now
-		nil, nil, // TODO: for now
-		nil, peerURLs, obj.clientURLs,
-		obj.dataDir, nil, // XXX: is this the same datadir or not?
-	)
+	// embed etcd
+	cfg := embed.NewConfig()
+	cfg.Name = memberName // hostname
+	cfg.Dir = obj.dataDir
+	cfg.ACUrls = obj.clientURLs
+	cfg.APUrls = peerURLs
+	cfg.LCUrls = obj.clientURLs
+	cfg.LPUrls = peerURLs
 
-	log.Printf("Etcd: StartServer: Initializing connections...")
-	if err := obj.etcdConn.Init(); err != nil {
-		if fatalErr, ok := err.(*etcdmain.ErrEtcdConnFatal); ok { // match?
-			log.Printf("Etcd: StartServer: Fatal: %+v", fatalErr.Err)
-			return fatalErr.Err
-		}
-		return err
+	cfg.InitialCluster = initialPeerURLsMap.String() // including myself!
+	if newCluster {
+		cfg.ClusterState = embed.ClusterStateFlagNew
+	} else {
+		cfg.ClusterState = embed.ClusterStateFlagExisting
 	}
+	//cfg.ForceNewCluster = newCluster // TODO ?
 
-	cfg := &etcdserver.ServerConfig{
-		Name:               memberName, // hostname
-		ClientURLs:         obj.clientURLs,
-		PeerURLs:           peerURLs,
-		DataDir:            obj.dataDir,
-		InitialPeerURLsMap: initialPeerURLsMap, // including myself!
-		NewCluster:         newCluster,
-		//ForceNewCluster: newCluster, // TODO ?
-		TickMs:        100,
-		ElectionTicks: 10,
-	}
-
-	obj.server, err = etcdserver.NewServer(cfg)
+	log.Printf("Etcd: StartServer: Starting server...")
+	obj.server, err = embed.StartEtcd(cfg)
 	if err != nil {
 		return err
 	}
-
-	log.Printf("Etcd: StartServer: Starting server...")
-	obj.server.Start()
-	obj.memberId = uint64(obj.server.ID()) // store member id for internal use
-
-	log.Printf("Etcd: StartServer: Listening...")
-	if err := obj.etcdConn.Listen(obj.server); err != nil {
-		return err
-	}
+	//log.Fatal(<-obj.server.Err())	XXX
+	log.Printf("Etcd: StartServer: Server running...")
+	obj.memberId = uint64(obj.server.Server.ID()) // store member id for internal use
 
 	obj.serverwg.Add(1)
 	return nil
@@ -1576,14 +1573,8 @@ func (obj *EmbdEtcd) StartServer(newCluster bool, peerURLsMap etcdtypes.URLsMap)
 func (obj *EmbdEtcd) DestroyServer() error {
 	var err error
 	log.Printf("Etcd: DestroyServer: Destroying...")
-
 	if obj.server != nil {
-		obj.server.Stop() // this blocks until server has stopped
-	}
-	log.Printf("Etcd: DestroyServer: Done stopping...")
-
-	if obj.etcdConn != nil {
-		obj.etcdConn.Close() // run the etcdStart defer operations
+		obj.server.Close() // this blocks until server has stopped
 	}
 	log.Printf("Etcd: DestroyServer: Done closing...")