Vendoring in libnetwork and libkv

* libkv upgrade is required for the docker discovery PR
* vendor-in libnetwork contains an update to network plugin api
  (Thanks @WeiZhang555 : https://github.com/docker/libnetwork/pull/516)

Signed-off-by: Madhu Venugopal <madhu@docker.com>

hack/vendor.sh

@@ -20,12 +20,12 @@ clone git github.com/tchap/go-patricia v2.1.0
 clone git golang.org/x/net 3cffabab72adf04f8e3b01c5baf775361837b5fe https://github.com/golang/net.git
 
 #get libnetwork packages
-clone git github.com/docker/libnetwork 2baa2ddc78b42f011f55633282ac63a72e1b09c1
+clone git github.com/docker/libnetwork 927d2765909ddc3a5dd49b649ae9ef121c0fbef0
 clone git github.com/armon/go-metrics eb0af217e5e9747e41dd5303755356b62d28e3ec
 clone git github.com/hashicorp/go-msgpack 71c2886f5a673a35f909803f38ece5810165097b
 clone git github.com/hashicorp/memberlist 9a1e242e454d2443df330bdd51a436d5a9058fc4
 clone git github.com/hashicorp/serf 7151adcef72687bf95f451a2e0ba15cb19412bf2
-clone git github.com/docker/libkv 60c7c881345b3c67defc7f93a8297debf041d43c
+clone git github.com/docker/libkv a0a57ed3755665e9a402a3df315402134eb6625f
 clone git github.com/vishvananda/netns 604eaf189ee867d8c147fafc28def2394e878d25
 clone git github.com/vishvananda/netlink 4b5dce31de6d42af5bb9811c6d265472199e0fec
 clone git github.com/BurntSushi/toml f706d00e3de6abe700c994cdd545a1a4915af060

vendor/src/github.com/docker/libkv/README.md

@@ -12,7 +12,7 @@ For example, you can use it to store your metadata or for service discovery to r
 
 You can also easily implement a generic *Leader Election* on top of it (see the [swarm/leadership](https://github.com/docker/swarm/tree/master/leadership) package).
 
-As of now, `libkv` offers support for `Consul`, `Etcd` and `Zookeeper`.
+As of now, `libkv` offers support for `Consul`, `Etcd`, `Zookeeper` and `BoltDB`.
 
 ## Example of usage
 
@@ -27,14 +27,20 @@ import (
 
 	"github.com/docker/libkv"
 	"github.com/docker/libkv/store"
+	"github.com/docker/libkv/store/consul"
 	log "github.com/Sirupsen/logrus"
 )
 
+func init() {
+	// Register consul store to libkv
+	consul.Register()
+}
+
 func main() {
 	client := "localhost:8500"
 
 	// Initialize a new store with consul
-	kv, err = libkv.NewStore(
+	kv, err := libkv.NewStore(
 		store.CONSUL, // or "consul"
 		[]string{client},
 		&store.Config{
@@ -62,11 +68,13 @@ func main() {
 
 You can find other usage examples for `libkv` under the `docker/swarm` or `docker/libnetwork` repositories.
 
-## Details
+## Warning
 
-You should expect the same experience for basic operations like `Get`/`Put`, etc.
+There are a few consistency issues with *etcd*, on the notion of *directory* and *key*. If you want to use the three KV backends in an interchangeable way, you should only put data on leaves (see [Issue 20](https://github.com/docker/libkv/issues/20) for more details). This will be fixed when *etcd* API v3 will be made available (API v3 drops the *directory/key* distinction). An official release for *libkv* with a tag is likely to come after this issue being marked as **solved**.
 
-However calls like `WatchTree` may return different events (or number of events) depending on the backend (for now, `Etcd` and `Consul` will likely return more events than `Zookeeper` that you should triage properly).
+Other than that, you should expect the same experience for basic operations like `Get`/`Put`, etc.
+
+Calls like `WatchTree` may return different events (or number of events) depending on the backend (for now, `Etcd` and `Consul` will likely return more events than `Zookeeper` that you should triage properly). Although you should be able to use it successfully to watch on events in an interchangeable way (see the **swarm/leadership** or **swarm/discovery** packages in **docker/swarm**).
 
 ## Create a new storage backend
 

vendor/src/github.com/docker/libkv/libkv.go

@@ -1,10 +1,72 @@
+// Package libkv provides a Go native library to store metadata.
+//
+// The goal of libkv is to abstract common store operations for multiple
+// Key/Value backends and offer the same experience no matter which one of the
+// backend you want to use.
+//
+// For example, you can use it to store your metadata or for service discovery to
+// register machines and endpoints inside your cluster.
+//
+// As of now, `libkv` offers support for `Consul`, `Etcd` and `Zookeeper`.
+//
+// ## Example of usage
+//
+// ### Create a new store and use Put/Get
+//
+//
+//     package main
+//
+//     import (
+//     	"fmt"
+//     	"time"
+//
+//     	"github.com/docker/libkv"
+//     	"github.com/docker/libkv/store"
+//     	log "github.com/Sirupsen/logrus"
+//     )
+//
+//     func main() {
+//     	client := "localhost:8500"
+//
+//     	// Initialize a new store with consul
+//     	kv, err := libkv.NewStore(
+//     		store.CONSUL, // or "consul"
+//     		[]string{client},
+//     		&store.Config{
+//     			ConnectionTimeout: 10*time.Second,
+//     		},
+//     	)
+//     	if err != nil {
+//     		log.Fatal("Cannot create store consul")
+//     	}
+//
+//     	key := "foo"
+//     	err = kv.Put(key, []byte("bar"), nil)
+//     	if err != nil {
+//     		log.Error("Error trying to put value at key `", key, "`")
+//     	}
+//
+//     	pair, err := kv.Get(key)
+//     	if err != nil {
+//     		log.Error("Error trying accessing value at key `", key, "`")
+//     	}
+//
+//     	log.Info("value: ", string(pair.Value))
+//     }
+//
+// ##Copyright and license
+//
+// Code and documentation copyright 2015 Docker, inc. Code released under the
+// Apache 2.0 license. Docs released under Creative commons.
+//
 package libkv
 
 import (
+	"fmt"
+	"sort"
+	"strings"
+
 	"github.com/docker/libkv/store"
-	"github.com/docker/libkv/store/consul"
-	"github.com/docker/libkv/store/etcd"
-	"github.com/docker/libkv/store/zookeeper"
 )
 
 // Initialize creates a new Store object, initializing the client
@@ -12,11 +74,16 @@ type Initialize func(addrs []string, options *store.Config) (store.Store, error)
 
 var (
 	// Backend initializers
-	initializers = map[store.Backend]Initialize{
+	initializers = make(map[store.Backend]Initialize)
-		store.CONSUL: consul.New,
+
-		store.ETCD:   etcd.New,
+	supportedBackend = func() string {
-		store.ZK:     zookeeper.New,
+		keys := make([]string, 0, len(initializers))
+		for k := range initializers {
+			keys = append(keys, string(k))
 		}
+		sort.Strings(keys)
+		return strings.Join(keys, ", ")
+	}()
 )
 
 // NewStore creates a an instance of store
@@ -25,5 +92,10 @@ func NewStore(backend store.Backend, addrs []string, options *store.Config) (sto
 		return init(addrs, options)
 	}
 
-	return nil, store.ErrNotSupported
+	return nil, fmt.Errorf("%s %s", store.ErrNotSupported.Error(), supportedBackend)
+}
+
+// AddStore adds a new store backend to libkv
+func AddStore(store store.Backend, init Initialize) {
+	initializers[store] = init
 }

vendor/src/github.com/docker/libkv/store/consul/consul.go

@@ -2,11 +2,13 @@ package consul
 
 import (
 	"crypto/tls"
+	"errors"
 	"net/http"
 	"strings"
 	"sync"
 	"time"
 
+	"github.com/docker/libkv"
 	"github.com/docker/libkv/store"
 	api "github.com/hashicorp/consul/api"
 )
@@ -18,22 +20,36 @@ const (
 	DefaultWatchWaitTime = 15 * time.Second
 )
 
+var (
+	// ErrMultipleEndpointsUnsupported is thrown when there are
+	// multiple endpoints specified for Consul
+	ErrMultipleEndpointsUnsupported = errors.New("consul does not support multiple endpoints")
+)
+
 // Consul is the receiver type for the
 // Store interface
 type Consul struct {
 	sync.Mutex
 	config *api.Config
 	client *api.Client
-	ephemeralTTL time.Duration
 }
 
 type consulLock struct {
 	lock *api.Lock
 }
 
+// Register registers consul to libkv
+func Register() {
+	libkv.AddStore(store.CONSUL, New)
+}
+
 // New creates a new Consul client given a list
 // of endpoints and optional tls config
 func New(endpoints []string, options *store.Config) (store.Store, error) {
+	if len(endpoints) > 1 {
+		return nil, ErrMultipleEndpointsUnsupported
+	}
+
 	s := &Consul{}
 
 	// Create Consul client
@@ -51,9 +67,6 @@ func New(endpoints []string, options *store.Config) (store.Store, error) {
 		if options.ConnectionTimeout != 0 {
 			s.setTimeout(options.ConnectionTimeout)
 		}
-		if options.EphemeralTTL != 0 {
-			s.setEphemeralTTL(options.EphemeralTTL)
-		}
 	}
 
 	// Creates a new client
@@ -79,18 +92,13 @@ func (s *Consul) setTimeout(time time.Duration) {
 	s.config.WaitTime = time
 }
 
-// SetEphemeralTTL sets the ttl for ephemeral nodes
-func (s *Consul) setEphemeralTTL(ttl time.Duration) {
-	s.ephemeralTTL = ttl
-}
-
 // Normalize the key for usage in Consul
 func (s *Consul) normalize(key string) string {
 	key = store.Normalize(key)
 	return strings.TrimPrefix(key, "/")
 }
 
-func (s *Consul) refreshSession(pair *api.KVPair) error {
+func (s *Consul) refreshSession(pair *api.KVPair, ttl time.Duration) error {
 	// Check if there is any previous session with an active TTL
 	session, err := s.getActiveSession(pair.Key)
 	if err != nil {
@@ -100,7 +108,7 @@ func (s *Consul) refreshSession(pair *api.KVPair) error {
 	if session == "" {
 		entry := &api.SessionEntry{
 			Behavior:  api.SessionBehaviorDelete, // Delete the key when the session expires
-			TTL:       ((s.ephemeralTTL) / 2).String(), // Consul multiplies the TTL by 2x
+			TTL:       (ttl / 2).String(),        // Consul multiplies the TTL by 2x
 			LockDelay: 1 * time.Millisecond,      // Virtually disable lock delay
 		}
 
@@ -126,7 +134,7 @@ func (s *Consul) refreshSession(pair *api.KVPair) error {
 
 	_, _, err = s.client.Session().Renew(session, nil)
 	if err != nil {
-		return s.refreshSession(pair)
+		return s.refreshSession(pair, ttl)
 	}
 	return nil
 }
@@ -174,9 +182,9 @@ func (s *Consul) Put(key string, value []byte, opts *store.WriteOptions) error {
 		Value: value,
 	}
 
-	if opts != nil && opts.Ephemeral {
+	if opts != nil && opts.TTL > 0 {
 		// Create or refresh the session
-		err := s.refreshSession(p)
+		err := s.refreshSession(p, opts.TTL)
 		if err != nil {
 			return err
 		}
@@ -188,6 +196,9 @@ func (s *Consul) Put(key string, value []byte, opts *store.WriteOptions) error {
 
 // Delete a value at "key"
 func (s *Consul) Delete(key string) error {
+	if _, err := s.Get(key); err != nil {
+		return err
+	}
 	_, err := s.client.KV().Delete(s.normalize(key), nil)
 	return err
 }
@@ -195,7 +206,10 @@ func (s *Consul) Delete(key string) error {
 // Exists checks that the key exists inside the store
 func (s *Consul) Exists(key string) (bool, error) {
 	_, err := s.Get(key)
-	if err != nil && err == store.ErrKeyNotFound {
+	if err != nil {
+		if err == store.ErrKeyNotFound {
+			return false, nil
+		}
 		return false, err
 	}
 	return true, nil
@@ -229,6 +243,9 @@ func (s *Consul) List(directory string) ([]*store.KVPair, error) {
 
 // DeleteTree deletes a range of keys under a given directory
 func (s *Consul) DeleteTree(directory string) error {
+	if _, err := s.List(directory); err != nil {
+		return err
+	}
 	_, err := s.client.KV().DeleteTree(s.normalize(directory), nil)
 	return err
 }

vendor/src/github.com/docker/libkv/store/etcd/etcd.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	etcd "github.com/coreos/go-etcd/etcd"
+	"github.com/docker/libkv"
 	"github.com/docker/libkv/store"
 )
 
@@ -15,7 +16,6 @@ import (
 // Store interface
 type Etcd struct {
 	client *etcd.Client
-	ephemeralTTL time.Duration
 }
 
 type etcdLock struct {
@@ -33,6 +33,11 @@ const (
 	defaultUpdateTime = 5 * time.Second
 )
 
+// Register registers etcd to libkv
+func Register() {
+	libkv.AddStore(store.ETCD, New)
+}
+
 // New creates a new Etcd client given a list
 // of endpoints and an optional tls config
 func New(addrs []string, options *store.Config) (store.Store, error) {
@@ -49,9 +54,6 @@ func New(addrs []string, options *store.Config) (store.Store, error) {
 		if options.ConnectionTimeout != 0 {
 			s.setTimeout(options.ConnectionTimeout)
 		}
-		if options.EphemeralTTL != 0 {
-			s.setEphemeralTTL(options.EphemeralTTL)
-		}
 	}
 
 	// Periodic SyncCluster
@@ -93,12 +95,6 @@ func (s *Etcd) setTimeout(time time.Duration) {
 	s.client.SetDialTimeout(time)
 }
 
-// setEphemeralHeartbeat sets the heartbeat value to notify
-// that a node is alive
-func (s *Etcd) setEphemeralTTL(time time.Duration) {
-	s.ephemeralTTL = time
-}
-
 // createDirectory creates the entire path for a directory
 // that does not exist
 func (s *Etcd) createDirectory(path string) error {
@@ -120,12 +116,9 @@ func (s *Etcd) createDirectory(path string) error {
 func (s *Etcd) Get(key string) (pair *store.KVPair, err error) {
 	result, err := s.client.Get(store.Normalize(key), false, false)
 	if err != nil {
-		if etcdError, ok := err.(*etcd.EtcdError); ok {
+		if isKeyNotFoundError(err) {
-			// Not a Directory or Not a file
-			if etcdError.ErrorCode == 102 || etcdError.ErrorCode == 104 {
 			return nil, store.ErrKeyNotFound
 		}
-		}
 		return nil, err
 	}
 
@@ -143,8 +136,8 @@ func (s *Etcd) Put(key string, value []byte, opts *store.WriteOptions) error {
 
 	// Default TTL = 0 means no expiration
 	var ttl uint64
-	if opts != nil && opts.Ephemeral {
+	if opts != nil && opts.TTL > 0 {
-		ttl = uint64(s.ephemeralTTL.Seconds())
+		ttl = uint64(opts.TTL.Seconds())
 	}
 
 	if _, err := s.client.Set(key, string(value), ttl); err != nil {
@@ -173,14 +166,17 @@ func (s *Etcd) Put(key string, value []byte, opts *store.WriteOptions) error {
 // Delete a value at "key"
 func (s *Etcd) Delete(key string) error {
 	_, err := s.client.Delete(store.Normalize(key), false)
+	if isKeyNotFoundError(err) {
+		return store.ErrKeyNotFound
+	}
 	return err
 }
 
 // Exists checks if the key exists inside the store
 func (s *Etcd) Exists(key string) (bool, error) {
-	entry, err := s.Get(key)
+	_, err := s.Get(key)
-	if err != nil && entry != nil {
+	if err != nil {
-		if err == store.ErrKeyNotFound || entry.Value == nil {
+		if err == store.ErrKeyNotFound {
 			return false, nil
 		}
 		return false, err
@@ -194,12 +190,6 @@ func (s *Etcd) Exists(key string) (bool, error) {
 // be sent to the channel. Providing a non-nil stopCh can
 // be used to stop watching.
 func (s *Etcd) Watch(key string, stopCh <-chan struct{}) (<-chan *store.KVPair, error) {
-	// Get the current value
-	current, err := s.Get(key)
-	if err != nil {
-		return nil, err
-	}
-
 	// Start an etcd watch.
 	// Note: etcd will send the current value through the channel.
 	etcdWatchCh := make(chan *etcd.Response)
@@ -212,12 +202,23 @@ func (s *Etcd) Watch(key string, stopCh <-chan struct{}) (<-chan *store.KVPair,
 	go func() {
 		defer close(watchCh)
 
+		// Get the current value
+		current, err := s.Get(key)
+		if err != nil {
+			return
+		}
+
 		// Push the current value through the channel.
 		watchCh <- current
 
 		for {
 			select {
 			case result := <-etcdWatchCh:
+				if result == nil || result.Node == nil {
+					// Something went wrong, exit
+					// No need to stop the chan as the watch already ended
+					return
+				}
 				watchCh <- &store.KVPair{
 					Key:       key,
 					Value:     []byte(result.Node.Value),
@@ -238,12 +239,6 @@ func (s *Etcd) Watch(key string, stopCh <-chan struct{}) (<-chan *store.KVPair,
 // will be sent to the channel .Providing a non-nil stopCh can
 // be used to stop watching.
 func (s *Etcd) WatchTree(directory string, stopCh <-chan struct{}) (<-chan []*store.KVPair, error) {
-	// Get child values
-	current, err := s.List(directory)
-	if err != nil {
-		return nil, err
-	}
-
 	// Start the watch
 	etcdWatchCh := make(chan *etcd.Response)
 	etcdStopCh := make(chan bool)
@@ -255,12 +250,23 @@ func (s *Etcd) WatchTree(directory string, stopCh <-chan struct{}) (<-chan []*st
 	go func() {
 		defer close(watchCh)
 
+		// Get child values
+		current, err := s.List(directory)
+		if err != nil {
+			return
+		}
+
 		// Push the current value through the channel.
 		watchCh <- current
 
 		for {
 			select {
-			case <-etcdWatchCh:
+			case event := <-etcdWatchCh:
+				if event == nil {
+					// Something went wrong, exit
+					// No need to stop the chan as the watch already ended
+					return
+				}
 				// FIXME: We should probably use the value pushed by the channel.
 				// However, Node.Nodes seems to be empty.
 				if list, err := s.List(directory); err == nil {
@@ -349,6 +355,9 @@ func (s *Etcd) AtomicDelete(key string, previous *store.KVPair) (bool, error) {
 func (s *Etcd) List(directory string) ([]*store.KVPair, error) {
 	resp, err := s.client.Get(store.Normalize(directory), true, true)
 	if err != nil {
+		if isKeyNotFoundError(err) {
+			return nil, store.ErrKeyNotFound
+		}
 		return nil, err
 	}
 	kv := []*store.KVPair{}
@@ -366,6 +375,9 @@ func (s *Etcd) List(directory string) ([]*store.KVPair, error) {
 // DeleteTree deletes a range of keys under a given directory
 func (s *Etcd) DeleteTree(directory string) error {
 	_, err := s.client.Delete(store.Normalize(directory), true)
+	if isKeyNotFoundError(err) {
+		return store.ErrKeyNotFound
+	}
 	return err
 }
 
@@ -422,7 +434,7 @@ func (l *etcdLock) Lock() (<-chan struct{}, error) {
 			lastIndex = resp.Node.ModifiedIndex
 		}
 
-		_, err = l.client.CompareAndSwap(key, l.value, l.ttl, "", lastIndex)
+		l.last, err = l.client.CompareAndSwap(key, l.value, l.ttl, "", lastIndex)
 
 		if err == nil {
 			// Leader section
@@ -457,7 +469,7 @@ func (l *etcdLock) holdLock(key string, lockHeld chan struct{}, stopLocking chan
 	for {
 		select {
 		case <-update.C:
-			l.last, err = l.client.Update(key, l.value, l.ttl)
+			l.last, err = l.client.CompareAndSwap(key, l.value, l.ttl, "", l.last.Node.ModifiedIndex)
 			if err != nil {
 				return
 			}
@@ -497,3 +509,15 @@ func (l *etcdLock) Unlock() error {
 func (s *Etcd) Close() {
 	return
 }
+
+func isKeyNotFoundError(err error) bool {
+	if err != nil {
+		if etcdError, ok := err.(*etcd.EtcdError); ok {
+			// Not a Directory or Not a file
+			if etcdError.ErrorCode == 100 || etcdError.ErrorCode == 102 || etcdError.ErrorCode == 104 {
+				return true
+			}
+		}
+	}
+	return false
+}

vendor/src/github.com/docker/libkv/store/store.go

@@ -16,11 +16,13 @@ const (
 	ETCD Backend = "etcd"
 	// ZK backend
 	ZK Backend = "zk"
+	// BOLTDB backend
+	BOLTDB Backend = "boltdb"
 )
 
 var (
 	// ErrNotSupported is thrown when the backend k/v store is not supported by libkv
-	ErrNotSupported = errors.New("Backend storage not supported yet, please choose another one")
+	ErrNotSupported = errors.New("Backend storage not supported yet, please choose one of")
 	// ErrNotImplemented is thrown when a method is not implemented by the current backend
 	ErrNotImplemented = errors.New("Call not implemented in current backend")
 	// ErrNotReachable is thrown when the API cannot be reached for issuing common store operations
@@ -39,7 +41,7 @@ var (
 type Config struct {
 	TLS               *tls.Config
 	ConnectionTimeout time.Duration
-	EphemeralTTL      time.Duration
+	Bucket            string
 }
 
 // Store represents the backend K/V storage
@@ -63,10 +65,10 @@ type Store interface {
 	Watch(key string, stopCh <-chan struct{}) (<-chan *KVPair, error)
 
 	// WatchTree watches for changes on child nodes under
-	// a given a directory
+	// a given directory
 	WatchTree(directory string, stopCh <-chan struct{}) (<-chan []*KVPair, error)
 
-	// CreateLock for a given key.
+	// NewLock creates a lock for a given key.
 	// The returned Locker is not held and must be acquired
 	// with `.Lock`. The Value is optional.
 	NewLock(key string, options *LockOptions) (Locker, error)
@@ -97,8 +99,7 @@ type KVPair struct {
 
 // WriteOptions contains optional request parameters
 type WriteOptions struct {
-	Heartbeat time.Duration
+	TTL time.Duration
-	Ephemeral bool
 }
 
 // LockOptions contains optional request parameters
@@ -107,10 +108,6 @@ type LockOptions struct {
 	TTL   time.Duration // Optional, expiration ttl associated with the lock
 }
 
-// WatchCallback is used for watch methods on keys
-// and is triggered on key change
-type WatchCallback func(entries ...*KVPair)
-
 // Locker provides locking mechanism on top of the store.
 // Similar to `sync.Lock` except it may return errors.
 type Locker interface {

vendor/src/github.com/docker/libkv/store/zookeeper/zookeeper.go

@@ -4,11 +4,14 @@ import (
 	"strings"
 	"time"
 
+	"github.com/docker/libkv"
 	"github.com/docker/libkv/store"
 	zk "github.com/samuel/go-zookeeper/zk"
 )
 
-const defaultTimeout = 10 * time.Second
+const (
+	defaultTimeout = 10 * time.Second
+)
 
 // Zookeeper is the receiver type for
 // the Store interface
@@ -24,6 +27,11 @@ type zookeeperLock struct {
 	value  []byte
 }
 
+// Register registers zookeeper to libkv
+func Register() {
+	libkv.AddStore(store.ZK, New)
+}
+
 // New creates a new Zookeeper client given a
 // list of endpoints and an optional tls config
 func New(endpoints []string, options *store.Config) (store.Store, error) {
@@ -55,15 +63,14 @@ func (s *Zookeeper) setTimeout(time time.Duration) {
 // Get the value at "key", returns the last modified index
 // to use in conjunction to Atomic calls
 func (s *Zookeeper) Get(key string) (pair *store.KVPair, err error) {
-	resp, meta, err := s.client.Get(store.Normalize(key))
+	resp, meta, err := s.client.Get(s.normalize(key))
-	if err != nil {
-		return nil, err
-	}
 
-	// If resp is nil, the key does not exist
+	if err != nil {
-	if resp == nil {
+		if err == zk.ErrNoNode {
 			return nil, store.ErrKeyNotFound
 		}
+		return nil, err
+	}
 
 	pair = &store.KVPair{
 		Key:       key,
@@ -80,10 +87,10 @@ func (s *Zookeeper) createFullPath(path []string, ephemeral bool) error {
 	for i := 1; i <= len(path); i++ {
 		newpath := "/" + strings.Join(path[:i], "/")
 		if i == len(path) && ephemeral {
-			_, err := s.client.Create(newpath, []byte{1}, zk.FlagEphemeral, zk.WorldACL(zk.PermAll))
+			_, err := s.client.Create(newpath, []byte{}, zk.FlagEphemeral, zk.WorldACL(zk.PermAll))
 			return err
 		}
-		_, err := s.client.Create(newpath, []byte{1}, 0, zk.WorldACL(zk.PermAll))
+		_, err := s.client.Create(newpath, []byte{}, 0, zk.WorldACL(zk.PermAll))
 		if err != nil {
 			// Skip if node already exists
 			if err != zk.ErrNodeExists {
@@ -96,7 +103,7 @@ func (s *Zookeeper) createFullPath(path []string, ephemeral bool) error {
 
 // Put a value at "key"
 func (s *Zookeeper) Put(key string, value []byte, opts *store.WriteOptions) error {
-	fkey := store.Normalize(key)
+	fkey := s.normalize(key)
 
 	exists, err := s.Exists(key)
 	if err != nil {
@@ -104,10 +111,10 @@ func (s *Zookeeper) Put(key string, value []byte, opts *store.WriteOptions) erro
 	}
 
 	if !exists {
-		if opts != nil && opts.Ephemeral {
+		if opts != nil && opts.TTL > 0 {
-			s.createFullPath(store.SplitKey(key), opts.Ephemeral)
+			s.createFullPath(store.SplitKey(strings.TrimSuffix(key, "/")), true)
 		} else {
-			s.createFullPath(store.SplitKey(key), false)
+			s.createFullPath(store.SplitKey(strings.TrimSuffix(key, "/")), false)
 		}
 	}
 
@@ -117,13 +124,16 @@ func (s *Zookeeper) Put(key string, value []byte, opts *store.WriteOptions) erro
 
 // Delete a value at "key"
 func (s *Zookeeper) Delete(key string) error {
-	err := s.client.Delete(store.Normalize(key), -1)
+	err := s.client.Delete(s.normalize(key), -1)
+	if err == zk.ErrNoNode {
+		return store.ErrKeyNotFound
+	}
 	return err
 }
 
 // Exists checks if the key exists inside the store
 func (s *Zookeeper) Exists(key string) (bool, error) {
-	exists, _, err := s.client.Exists(store.Normalize(key))
+	exists, _, err := s.client.Exists(s.normalize(key))
 	if err != nil {
 		return false, err
 	}
@@ -151,7 +161,7 @@ func (s *Zookeeper) Watch(key string, stopCh <-chan struct{}) (<-chan *store.KVP
 		// to listening to any event that may occur on that key
 		watchCh <- pair
 		for {
-			_, _, eventCh, err := s.client.GetW(store.Normalize(key))
+			_, _, eventCh, err := s.client.GetW(s.normalize(key))
 			if err != nil {
 				return
 			}
@@ -195,7 +205,7 @@ func (s *Zookeeper) WatchTree(directory string, stopCh <-chan struct{}) (<-chan
 		watchCh <- entries
 
 		for {
-			_, _, eventCh, err := s.client.ChildrenW(store.Normalize(directory))
+			_, _, eventCh, err := s.client.ChildrenW(s.normalize(directory))
 			if err != nil {
 				return
 			}
@@ -218,8 +228,11 @@ func (s *Zookeeper) WatchTree(directory string, stopCh <-chan struct{}) (<-chan
 
 // List child nodes of a given directory
 func (s *Zookeeper) List(directory string) ([]*store.KVPair, error) {
-	keys, stat, err := s.client.Children(store.Normalize(directory))
+	keys, stat, err := s.client.Children(s.normalize(directory))
 	if err != nil {
+		if err == zk.ErrNoNode {
+			return nil, store.ErrKeyNotFound
+		}
 		return nil, err
 	}
 
@@ -227,8 +240,12 @@ func (s *Zookeeper) List(directory string) ([]*store.KVPair, error) {
 
 	// FIXME Costly Get request for each child key..
 	for _, key := range keys {
-		pair, err := s.Get(directory + store.Normalize(key))
+		pair, err := s.Get(strings.TrimSuffix(directory, "/") + s.normalize(key))
 		if err != nil {
+			// If node is not found: List is out of date, retry
+			if err == zk.ErrNoNode {
+				return s.List(directory)
+			}
 			return nil, err
 		}
 
@@ -253,7 +270,7 @@ func (s *Zookeeper) DeleteTree(directory string) error {
 
 	for _, pair := range pairs {
 		reqs = append(reqs, &zk.DeleteRequest{
-			Path:    store.Normalize(directory + "/" + pair.Key),
+			Path:    s.normalize(directory + "/" + pair.Key),
 			Version: -1,
 		})
 	}
@@ -268,7 +285,7 @@ func (s *Zookeeper) AtomicPut(key string, value []byte, previous *store.KVPair,
 
 	var lastIndex uint64
 	if previous != nil {
-		meta, err := s.client.Set(store.Normalize(key), value, int32(previous.LastIndex))
+		meta, err := s.client.Set(s.normalize(key), value, int32(previous.LastIndex))
 		if err != nil {
 			// Compare Failed
 			if err == zk.ErrBadVersion {
@@ -279,7 +296,7 @@ func (s *Zookeeper) AtomicPut(key string, value []byte, previous *store.KVPair,
 		lastIndex = uint64(meta.Version)
 	} else {
 		// Interpret previous == nil as create operation.
-		_, err := s.client.Create(store.Normalize(key), value, 0, zk.WorldACL(zk.PermAll))
+		_, err := s.client.Create(s.normalize(key), value, 0, zk.WorldACL(zk.PermAll))
 		if err != nil {
 			// Zookeeper will complain if the directory doesn't exist.
 			if err == zk.ErrNoNode {
@@ -290,7 +307,7 @@ func (s *Zookeeper) AtomicPut(key string, value []byte, previous *store.KVPair,
 					// Failed to create the directory.
 					return false, nil, err
 				}
-				if _, err := s.client.Create(store.Normalize(key), value, 0, zk.WorldACL(zk.PermAll)); err != nil {
+				if _, err := s.client.Create(s.normalize(key), value, 0, zk.WorldACL(zk.PermAll)); err != nil {
 					return false, nil, err
 				}
 
@@ -319,7 +336,7 @@ func (s *Zookeeper) AtomicDelete(key string, previous *store.KVPair) (bool, erro
 		return false, store.ErrPreviousNotSpecified
 	}
 
-	err := s.client.Delete(store.Normalize(key), int32(previous.LastIndex))
+	err := s.client.Delete(s.normalize(key), int32(previous.LastIndex))
 	if err != nil {
 		if err == zk.ErrBadVersion {
 			return false, store.ErrKeyModified
@@ -343,9 +360,9 @@ func (s *Zookeeper) NewLock(key string, options *store.LockOptions) (lock store.
 
 	lock = &zookeeperLock{
 		client: s.client,
-		key:    store.Normalize(key),
+		key:    s.normalize(key),
 		value:  value,
-		lock:   zk.NewLock(s.client, store.Normalize(key), zk.WorldACL(zk.PermAll)),
+		lock:   zk.NewLock(s.client, s.normalize(key), zk.WorldACL(zk.PermAll)),
 	}
 
 	return lock, err
@@ -377,3 +394,9 @@ func (l *zookeeperLock) Unlock() error {
 func (s *Zookeeper) Close() {
 	s.client.Close()
 }
+
+// Normalize the key for usage in Zookeeper
+func (s *Zookeeper) normalize(key string) string {
+	key = store.Normalize(key)
+	return strings.TrimSuffix(key, "/")
+}

vendor/src/github.com/docker/libnetwork/datastore/datastore.go

@@ -6,6 +6,9 @@ import (
 
 	"github.com/docker/libkv"
 	"github.com/docker/libkv/store"
+	"github.com/docker/libkv/store/consul"
+	"github.com/docker/libkv/store/etcd"
+	"github.com/docker/libkv/store/zookeeper"
 	"github.com/docker/libnetwork/config"
 	"github.com/docker/libnetwork/types"
 )
@@ -66,6 +69,12 @@ const (
 
 var rootChain = []string{"docker", "libnetwork"}
 
+func init() {
+	consul.Register()
+	zookeeper.Register()
+	etcd.Register()
+}
+
 //Key provides convenient method to create a Key
 func Key(key ...string) string {
 	keychain := append(rootChain, key...)

vendor/src/github.com/docker/libnetwork/drivers/remote/api/api.go

@@ -16,6 +16,12 @@ func (r *Response) GetError() string {
 	return r.Err
 }
 
+// GetCapabilityResponse is the response of GetCapability request
+type GetCapabilityResponse struct {
+	Response
+	Scope string
+}
+
 // CreateNetworkRequest requests a new network.
 type CreateNetworkRequest struct {
 	// A network ID that remote plugins are expected to store for future

vendor/src/github.com/docker/libnetwork/drivers/remote/driver.go

@@ -28,16 +28,40 @@ func newDriver(name string, client *plugins.Client) driverapi.Driver {
 // plugin is activated.
 func Init(dc driverapi.DriverCallback) error {
 	plugins.Handle(driverapi.NetworkPluginEndpointType, func(name string, client *plugins.Client) {
-		c := driverapi.Capability{
+		// negotiate driver capability with client
-			Scope: driverapi.GlobalScope,
+		d := newDriver(name, client)
+		c, err := d.(*driver).getCapabilities()
+		if err != nil {
+			log.Errorf("error getting capability for %s due to %v", name, err)
+			return
 		}
-		if err := dc.RegisterDriver(name, newDriver(name, client), c); err != nil {
+		if err = dc.RegisterDriver(name, d, *c); err != nil {
 			log.Errorf("error registering driver for %s due to %v", name, err)
 		}
 	})
 	return nil
 }
 
+// Get capability from client
+func (d *driver) getCapabilities() (*driverapi.Capability, error) {
+	var capResp api.GetCapabilityResponse
+	if err := d.call("GetCapabilities", nil, &capResp); err != nil {
+		return nil, err
+	}
+
+	c := &driverapi.Capability{}
+	switch capResp.Scope {
+	case "global":
+		c.Scope = driverapi.GlobalScope
+	case "local":
+		c.Scope = driverapi.LocalScope
+	default:
+		return nil, fmt.Errorf("invalid capability: expecting 'local' or 'global', got %s", capResp.Scope)
+	}
+
+	return c, nil
+}
+
 // Config is not implemented for remote drivers, since it is assumed
 // to be supplied to the remote process out-of-band (e.g., as command
 // line arguments).