Update libkv dependency

vendor/github.com/coreos/etcd/client/auth_role.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -56,22 +56,22 @@ func NewAuthRoleAPI(c Client) AuthRoleAPI {
 }
 
 type AuthRoleAPI interface {
-	// Add a role.
+	// AddRole adds a role.
 	AddRole(ctx context.Context, role string) error
 
-	// Remove a role.
+	// RemoveRole removes a role.
 	RemoveRole(ctx context.Context, role string) error
 
-	// Get role details.
+	// GetRole retrieves role details.
 	GetRole(ctx context.Context, role string) (*Role, error)
 
-	// Grant a role some permission prefixes for the KV store.
+	// GrantRoleKV grants a role some permission prefixes for the KV store.
 	GrantRoleKV(ctx context.Context, role string, prefixes []string, permType PermissionType) (*Role, error)
 
-	// Revoke some some permission prefixes for a role on the KV store.
+	// RevokeRoleKV revokes some permission prefixes for a role on the KV store.
 	RevokeRoleKV(ctx context.Context, role string, prefixes []string, permType PermissionType) (*Role, error)
 
-	// List roles.
+	// ListRoles lists roles.
 	ListRoles(ctx context.Context) ([]string, error)
 }
 
@@ -115,17 +115,20 @@ func (r *httpAuthRoleAPI) ListRoles(ctx context.Context) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
 		return nil, err
 	}
-	var userList struct {
-		Roles []string `json:"roles"`
+	var roleList struct {
+		Roles []Role `json:"roles"`
 	}
-	err = json.Unmarshal(body, &userList)
-	if err != nil {
+	if err = json.Unmarshal(body, &roleList); err != nil {
 		return nil, err
 	}
-	return userList.Roles, nil
+	ret := make([]string, 0, len(roleList.Roles))
+	for _, r := range roleList.Roles {
+		ret = append(ret, r.Role)
+	}
+	return ret, nil
 }
 
 func (r *httpAuthRoleAPI) AddRole(ctx context.Context, rolename string) error {
@@ -218,17 +221,16 @@ func (r *httpAuthRoleAPI) modRole(ctx context.Context, req *authRoleAPIAction) (
 	if err != nil {
 		return nil, err
 	}
-	if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
 		var sec authError
-		err := json.Unmarshal(body, &sec)
+		err = json.Unmarshal(body, &sec)
 		if err != nil {
 			return nil, err
 		}
 		return nil, sec
 	}
 	var role Role
-	err = json.Unmarshal(body, &role)
-	if err != nil {
+	if err = json.Unmarshal(body, &role); err != nil {
 		return nil, err
 	}
 	return &role, nil

vendor/github.com/coreos/etcd/client/auth_user.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -36,6 +36,17 @@ type User struct {
 	Revoke   []string `json:"revoke,omitempty"`
 }
 
+// userListEntry is the user representation given by the server for ListUsers
+type userListEntry struct {
+	User  string `json:"user"`
+	Roles []Role `json:"roles"`
+}
+
+type UserRoles struct {
+	User  string `json:"user"`
+	Roles []Role `json:"roles"`
+}
+
 func v2AuthURL(ep url.URL, action string, name string) *url.URL {
 	if name != "" {
 		ep.Path = path.Join(ep.Path, defaultV2AuthPrefix, action, name)
@@ -78,9 +89,9 @@ func (s *httpAuthAPI) enableDisable(ctx context.Context, req httpAction) error {
 	if err != nil {
 		return err
 	}
-	if err := assertStatusCode(resp.StatusCode, http.StatusOK, http.StatusCreated); err != nil {
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK, http.StatusCreated); err != nil {
 		var sec authError
-		err := json.Unmarshal(body, &sec)
+		err = json.Unmarshal(body, &sec)
 		if err != nil {
 			return err
 		}
@@ -117,25 +128,25 @@ func NewAuthUserAPI(c Client) AuthUserAPI {
 }
 
 type AuthUserAPI interface {
-	// Add a user.
+	// AddUser adds a user.
 	AddUser(ctx context.Context, username string, password string) error
 
-	// Remove a user.
+	// RemoveUser removes a user.
 	RemoveUser(ctx context.Context, username string) error
 
-	// Get user details.
+	// GetUser retrieves user details.
 	GetUser(ctx context.Context, username string) (*User, error)
 
-	// Grant a user some permission roles.
+	// GrantUser grants a user some permission roles.
 	GrantUser(ctx context.Context, username string, roles []string) (*User, error)
 
-	// Revoke some permission roles from a user.
+	// RevokeUser revokes some permission roles from a user.
 	RevokeUser(ctx context.Context, username string, roles []string) (*User, error)
 
-	// Change the user's password.
+	// ChangePassword changes the user's password.
 	ChangePassword(ctx context.Context, username string, password string) (*User, error)
 
-	// List users.
+	// ListUsers lists the users.
 	ListUsers(ctx context.Context) ([]string, error)
 }
 
@@ -179,22 +190,28 @@ func (u *httpAuthUserAPI) ListUsers(ctx context.Context) ([]string, error) {
 	if err != nil {
 		return nil, err
 	}
-	if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
 		var sec authError
-		err := json.Unmarshal(body, &sec)
+		err = json.Unmarshal(body, &sec)
 		if err != nil {
 			return nil, err
 		}
 		return nil, sec
 	}
+
 	var userList struct {
-		Users []string `json:"users"`
+		Users []userListEntry `json:"users"`
 	}
-	err = json.Unmarshal(body, &userList)
-	if err != nil {
+
+	if err = json.Unmarshal(body, &userList); err != nil {
 		return nil, err
 	}
-	return userList.Users, nil
+
+	ret := make([]string, 0, len(userList.Users))
+	for _, u := range userList.Users {
+		ret = append(ret, u.User)
+	}
+	return ret, nil
 }
 
 func (u *httpAuthUserAPI) AddUser(ctx context.Context, username string, password string) error {
@@ -221,9 +238,9 @@ func (u *httpAuthUserAPI) addRemoveUser(ctx context.Context, req *authUserAPIAct
 	if err != nil {
 		return err
 	}
-	if err := assertStatusCode(resp.StatusCode, http.StatusOK, http.StatusCreated); err != nil {
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK, http.StatusCreated); err != nil {
 		var sec authError
-		err := json.Unmarshal(body, &sec)
+		err = json.Unmarshal(body, &sec)
 		if err != nil {
 			return err
 		}
@@ -280,18 +297,24 @@ func (u *httpAuthUserAPI) modUser(ctx context.Context, req *authUserAPIAction) (
 	if err != nil {
 		return nil, err
 	}
-	if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+	if err = assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
 		var sec authError
-		err := json.Unmarshal(body, &sec)
+		err = json.Unmarshal(body, &sec)
 		if err != nil {
 			return nil, err
 		}
 		return nil, sec
 	}
 	var user User
-	err = json.Unmarshal(body, &user)
-	if err != nil {
-		return nil, err
+	if err = json.Unmarshal(body, &user); err != nil {
+		var userR UserRoles
+		if urerr := json.Unmarshal(body, &userR); urerr != nil {
+			return nil, err
+		}
+		user.User = userR.User
+		for _, r := range userR.Roles {
+			user.Roles = append(user.Roles, r.Role)
+		}
 	}
 	return &user, nil
 }

vendor/github.com/coreos/etcd/client/cancelreq.go

@@ -4,8 +4,6 @@
 
 // borrowed from golang/net/context/ctxhttp/cancelreq.go
 
-// +build go1.5
-
 package client
 
 import "net/http"

vendor/github.com/coreos/etcd/client/cancelreq_go14.go

@@ -1,17 +0,0 @@
-// Copyright 2015 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// borrowed from golang/net/context/ctxhttp/cancelreq_go14.go
-
-// +build !go1.5
-
-package client
-
-import "net/http"
-
-func requestCanceler(tr CancelableTransport, req *http.Request) func() {
-	return func() {
-		tr.CancelRequest(req)
-	}
-}

vendor/github.com/coreos/etcd/client/client.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -15,6 +15,7 @@
 package client
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
@@ -22,11 +23,13 @@ import (
 	"net"
 	"net/http"
 	"net/url"
-	"reflect"
 	"sort"
+	"strconv"
 	"sync"
 	"time"
 
+	"github.com/coreos/etcd/version"
+
 	"golang.org/x/net/context"
 )
 
@@ -34,7 +37,12 @@ var (
 	ErrNoEndpoints           = errors.New("client: no endpoints available")
 	ErrTooManyRedirects      = errors.New("client: too many redirects")
 	ErrClusterUnavailable    = errors.New("client: etcd cluster is unavailable or misconfigured")
+	ErrNoLeaderEndpoint      = errors.New("client: no leader endpoint available")
 	errTooManyRedirectChecks = errors.New("client: too many redirect checks")
+
+	// oneShotCtxValue is set on a context using WithValue(&oneShotValue) so
+	// that Do() will not retry a request
+	oneShotCtxValue interface{}
 )
 
 var DefaultRequestTimeout = 5 * time.Second
@@ -48,6 +56,29 @@ var DefaultTransport CancelableTransport = &http.Transport{
 	TLSHandshakeTimeout: 10 * time.Second,
 }
 
+type EndpointSelectionMode int
+
+const (
+	// EndpointSelectionRandom is the default value of the 'SelectionMode'.
+	// As the name implies, the client object will pick a node from the members
+	// of the cluster in a random fashion. If the cluster has three members, A, B,
+	// and C, the client picks any node from its three members as its request
+	// destination.
+	EndpointSelectionRandom EndpointSelectionMode = iota
+
+	// If 'SelectionMode' is set to 'EndpointSelectionPrioritizeLeader',
+	// requests are sent directly to the cluster leader. This reduces
+	// forwarding roundtrips compared to making requests to etcd followers
+	// who then forward them to the cluster leader. In the event of a leader
+	// failure, however, clients configured this way cannot prioritize among
+	// the remaining etcd followers. Therefore, when a client sets 'SelectionMode'
+	// to 'EndpointSelectionPrioritizeLeader', it must use 'client.AutoSync()' to
+	// maintain its knowledge of current cluster state.
+	//
+	// This mode should be used with Client.AutoSync().
+	EndpointSelectionPrioritizeLeader
+)
+
 type Config struct {
 	// Endpoints defines a set of URLs (schemes, hosts and ports only)
 	// that can be used to communicate with a logical etcd cluster. For
@@ -73,7 +104,7 @@ type Config struct {
 	// CheckRedirect specifies the policy for handling HTTP redirects.
 	// If CheckRedirect is not nil, the Client calls it before
 	// following an HTTP redirect. The sole argument is the number of
-	// requests that have alrady been made. If CheckRedirect returns
+	// requests that have already been made. If CheckRedirect returns
 	// an error, Client.Do will not make any further requests and return
 	// the error back it to the caller.
 	//
@@ -99,11 +130,17 @@ type Config struct {
 	// watch start. But if server is behind some kind of proxy, the response
 	// header may be cached at proxy, and Client cannot rely on this behavior.
 	//
+	// Especially, wait request will ignore this timeout.
+	//
 	// One API call may send multiple requests to different etcd servers until it
 	// succeeds. Use context of the API to specify the overall timeout.
 	//
 	// A HeaderTimeoutPerRequest of zero means no timeout.
 	HeaderTimeoutPerRequest time.Duration
+
+	// SelectionMode is an EndpointSelectionMode enum that specifies the
+	// policy for choosing the etcd cluster node to which requests are sent.
+	SelectionMode EndpointSelectionMode
 }
 
 func (cfg *Config) transport() CancelableTransport {
@@ -162,6 +199,14 @@ type Client interface {
 	// this may differ from the initial Endpoints provided in the Config.
 	Endpoints() []string
 
+	// SetEndpoints sets the set of API endpoints used by Client to resolve
+	// HTTP requests. If the given endpoints are not valid, an error will be
+	// returned
+	SetEndpoints(eps []string) error
+
+	// GetVersion retrieves the current etcd server and cluster version
+	GetVersion(ctx context.Context) (*version.Versions, error)
+
 	httpClient
 }
 
@@ -169,6 +214,7 @@ func New(cfg Config) (Client, error) {
 	c := &httpClusterClient{
 		clientFactory: newHTTPClientFactory(cfg.transport(), cfg.checkRedirect(), cfg.HeaderTimeoutPerRequest),
 		rand:          rand.New(rand.NewSource(int64(time.Now().Nanosecond()))),
+		selectionMode: cfg.SelectionMode,
 	}
 	if cfg.Username != "" {
 		c.credentials = &credentials{
@@ -176,7 +222,7 @@ func New(cfg Config) (Client, error) {
 			password: cfg.Password,
 		}
 	}
-	if err := c.reset(cfg.Endpoints); err != nil {
+	if err := c.SetEndpoints(cfg.Endpoints); err != nil {
 		return nil, err
 	}
 	return c, nil
@@ -216,25 +262,69 @@ type httpClusterClient struct {
 	pinned        int
 	credentials   *credentials
 	sync.RWMutex
-	rand *rand.Rand
+	rand          *rand.Rand
+	selectionMode EndpointSelectionMode
 }
 
-func (c *httpClusterClient) reset(eps []string) error {
+func (c *httpClusterClient) getLeaderEndpoint(ctx context.Context, eps []url.URL) (string, error) {
+	ceps := make([]url.URL, len(eps))
+	copy(ceps, eps)
+
+	// To perform a lookup on the new endpoint list without using the current
+	// client, we'll copy it
+	clientCopy := &httpClusterClient{
+		clientFactory: c.clientFactory,
+		credentials:   c.credentials,
+		rand:          c.rand,
+
+		pinned:    0,
+		endpoints: ceps,
+	}
+
+	mAPI := NewMembersAPI(clientCopy)
+	leader, err := mAPI.Leader(ctx)
+	if err != nil {
+		return "", err
+	}
+	if len(leader.ClientURLs) == 0 {
+		return "", ErrNoLeaderEndpoint
+	}
+
+	return leader.ClientURLs[0], nil // TODO: how to handle multiple client URLs?
+}
+
+func (c *httpClusterClient) parseEndpoints(eps []string) ([]url.URL, error) {
 	if len(eps) == 0 {
-		return ErrNoEndpoints
+		return []url.URL{}, ErrNoEndpoints
 	}
 
 	neps := make([]url.URL, len(eps))
 	for i, ep := range eps {
 		u, err := url.Parse(ep)
 		if err != nil {
-			return err
+			return []url.URL{}, err
 		}
 		neps[i] = *u
 	}
+	return neps, nil
+}
+
+func (c *httpClusterClient) SetEndpoints(eps []string) error {
+	neps, err := c.parseEndpoints(eps)
+	if err != nil {
+		return err
+	}
+
+	c.Lock()
+	defer c.Unlock()
 
 	c.endpoints = shuffleEndpoints(c.rand, neps)
-	// TODO: pin old endpoint if possible, and rebalance when new endpoint appears
+	// We're not doing anything for PrioritizeLeader here. This is
+	// due to not having a context meaning we can't call getLeaderEndpoint
+	// However, if you're using PrioritizeLeader, you've already been told
+	// to regularly call sync, where we do have a ctx, and can figure the
+	// leader. PrioritizeLeader is also quite a loose guarantee, so deal
+	// with it
 	c.pinned = 0
 
 	return nil
@@ -268,6 +358,7 @@ func (c *httpClusterClient) Do(ctx context.Context, act httpAction) (*http.Respo
 	var body []byte
 	var err error
 	cerr := &ClusterError{}
+	isOneShot := ctx.Value(&oneShotCtxValue) != nil
 
 	for i := pinned; i < leps+pinned; i++ {
 		k := i % leps
@@ -275,13 +366,13 @@ func (c *httpClusterClient) Do(ctx context.Context, act httpAction) (*http.Respo
 		resp, body, err = hc.Do(ctx, action)
 		if err != nil {
 			cerr.Errors = append(cerr.Errors, err)
-			// mask previous errors with context error, which is controlled by user
+			if err == ctx.Err() {
+				return nil, nil, ctx.Err()
+			}
 			if err == context.Canceled || err == context.DeadlineExceeded {
 				return nil, nil, err
 			}
-			continue
-		}
-		if resp.StatusCode/100 == 5 {
+		} else if resp.StatusCode/100 == 5 {
 			switch resp.StatusCode {
 			case http.StatusInternalServerError, http.StatusServiceUnavailable:
 				// TODO: make sure this is a no leader response
@@ -289,7 +380,16 @@ func (c *httpClusterClient) Do(ctx context.Context, act httpAction) (*http.Respo
 			default:
 				cerr.Errors = append(cerr.Errors, fmt.Errorf("client: etcd member %s returns server error [%s]", eps[k].String(), http.StatusText(resp.StatusCode)))
 			}
-			continue
+			err = cerr.Errors[0]
+		}
+		if err != nil {
+			if !isOneShot {
+				continue
+			}
+			c.Lock()
+			c.pinned = (k + 1) % leps
+			c.Unlock()
+			return nil, nil, err
 		}
 		if k != pinned {
 			c.Lock()
@@ -321,27 +421,51 @@ func (c *httpClusterClient) Sync(ctx context.Context) error {
 		return err
 	}
 
-	c.Lock()
-	defer c.Unlock()
-
-	eps := make([]string, 0)
+	var eps []string
 	for _, m := range ms {
 		eps = append(eps, m.ClientURLs...)
 	}
-	sort.Sort(sort.StringSlice(eps))
 
-	ceps := make([]string, len(c.endpoints))
-	for i, cep := range c.endpoints {
-		ceps[i] = cep.String()
-	}
-	sort.Sort(sort.StringSlice(ceps))
-	// fast path if no change happens
-	// this helps client to pin the endpoint when no cluster change
-	if reflect.DeepEqual(eps, ceps) {
-		return nil
+	neps, err := c.parseEndpoints(eps)
+	if err != nil {
+		return err
 	}
 
-	return c.reset(eps)
+	npin := 0
+
+	switch c.selectionMode {
+	case EndpointSelectionRandom:
+		c.RLock()
+		eq := endpointsEqual(c.endpoints, neps)
+		c.RUnlock()
+
+		if eq {
+			return nil
+		}
+		// When items in the endpoint list changes, we choose a new pin
+		neps = shuffleEndpoints(c.rand, neps)
+	case EndpointSelectionPrioritizeLeader:
+		nle, err := c.getLeaderEndpoint(ctx, neps)
+		if err != nil {
+			return ErrNoLeaderEndpoint
+		}
+
+		for i, n := range neps {
+			if n.String() == nle {
+				npin = i
+				break
+			}
+		}
+	default:
+		return fmt.Errorf("invalid endpoint selection mode: %d", c.selectionMode)
+	}
+
+	c.Lock()
+	defer c.Unlock()
+	c.endpoints = neps
+	c.pinned = npin
+
+	return nil
 }
 
 func (c *httpClusterClient) AutoSync(ctx context.Context, interval time.Duration) error {
@@ -360,6 +484,33 @@ func (c *httpClusterClient) AutoSync(ctx context.Context, interval time.Duration
 	}
 }
 
+func (c *httpClusterClient) GetVersion(ctx context.Context) (*version.Versions, error) {
+	act := &getAction{Prefix: "/version"}
+
+	resp, body, err := c.Do(ctx, act)
+	if err != nil {
+		return nil, err
+	}
+
+	switch resp.StatusCode {
+	case http.StatusOK:
+		if len(body) == 0 {
+			return nil, ErrEmptyBody
+		}
+		var vresp version.Versions
+		if err := json.Unmarshal(body, &vresp); err != nil {
+			return nil, ErrInvalidJSON
+		}
+		return &vresp, nil
+	default:
+		var etcdErr Error
+		if err := json.Unmarshal(body, &etcdErr); err != nil {
+			return nil, ErrInvalidJSON
+		}
+		return nil, etcdErr
+	}
+}
+
 type roundTripResponse struct {
 	resp *http.Response
 	err  error
@@ -378,9 +529,24 @@ func (c *simpleHTTPClient) Do(ctx context.Context, act httpAction) (*http.Respon
 		return nil, nil, err
 	}
 
-	hctx, hcancel := context.WithCancel(ctx)
-	if c.headerTimeout > 0 {
+	isWait := false
+	if req != nil && req.URL != nil {
+		ws := req.URL.Query().Get("wait")
+		if len(ws) != 0 {
+			var err error
+			isWait, err = strconv.ParseBool(ws)
+			if err != nil {
+				return nil, nil, fmt.Errorf("wrong wait value %s (%v for %+v)", ws, err, req)
+			}
+		}
+	}
+
+	var hctx context.Context
+	var hcancel context.CancelFunc
+	if !isWait && c.headerTimeout > 0 {
 		hctx, hcancel = context.WithTimeout(ctx, c.headerTimeout)
+	} else {
+		hctx, hcancel = context.WithCancel(ctx)
 	}
 	defer hcancel()
 
@@ -512,3 +678,27 @@ func shuffleEndpoints(r *rand.Rand, eps []url.URL) []url.URL {
 	}
 	return neps
 }
+
+func endpointsEqual(left, right []url.URL) bool {
+	if len(left) != len(right) {
+		return false
+	}
+
+	sLeft := make([]string, len(left))
+	sRight := make([]string, len(right))
+	for i, l := range left {
+		sLeft[i] = l.String()
+	}
+	for i, r := range right {
+		sRight[i] = r.String()
+	}
+
+	sort.Strings(sLeft)
+	sort.Strings(sRight)
+	for i := range sLeft {
+		if sLeft[i] != sRight[i] {
+			return false
+		}
+	}
+	return true
+}

vendor/github.com/coreos/etcd/client/cluster_error.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -21,7 +21,11 @@ type ClusterError struct {
 }
 
 func (ce *ClusterError) Error() string {
-	return ErrClusterUnavailable.Error()
+	s := ErrClusterUnavailable.Error()
+	for i, e := range ce.Errors {
+		s += fmt.Sprintf("; error #%d: %s\n", i, e)
+	}
+	return s
 }
 
 func (ce *ClusterError) Detail() string {

vendor/github.com/coreos/etcd/client/curl.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

vendor/github.com/coreos/etcd/client/discover.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -14,8 +14,27 @@
 
 package client
 
+import (
+	"github.com/coreos/etcd/pkg/srv"
+)
+
 // Discoverer is an interface that wraps the Discover method.
 type Discoverer interface {
 	// Discover looks up the etcd servers for the domain.
 	Discover(domain string) ([]string, error)
 }
+
+type srvDiscover struct{}
+
+// NewSRVDiscover constructs a new Discoverer that uses the stdlib to lookup SRV records.
+func NewSRVDiscover() Discoverer {
+	return &srvDiscover{}
+}
+
+func (d *srvDiscover) Discover(domain string) ([]string, error) {
+	srvs, err := srv.GetClient("etcd-client", domain)
+	if err != nil {
+		return nil, err
+	}
+	return srvs.Endpoints, nil
+}

vendor/github.com/coreos/etcd/client/doc.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -34,6 +34,8 @@ Create a Config and exchange it for a Client:
 		// handle error
 	}
 
+Clients are safe for concurrent use by multiple goroutines.
+
 Create a KeysAPI using the Client, then use it to interact with etcd:
 
 	kAPI := client.NewKeysAPI(c)

vendor/github.com/coreos/etcd/client/keys.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -106,7 +106,7 @@ type KeysAPI interface {
 
 	// Set assigns a new value to a Node identified by a given key. The caller
 	// may define a set of conditions in the SetOptions. If SetOptions.Dir=true
-	// than value is ignored.
+	// then value is ignored.
 	Set(ctx context.Context, key, value string, opts *SetOptions) (*Response, error)
 
 	// Delete removes a Node identified by the given key, optionally destroying
@@ -184,8 +184,17 @@ type SetOptions struct {
 	// a TTL of 0.
 	TTL time.Duration
 
+	// Refresh set to true means a TTL value can be updated
+	// without firing a watch or changing the node value. A
+	// value must not be provided when refreshing a key.
+	Refresh bool
+
 	// Dir specifies whether or not this Node should be created as a directory.
 	Dir bool
+
+	// NoValueOnSuccess specifies whether the response contains the current value of the Node.
+	// If set, the response will only contain the current value when the request fails.
+	NoValueOnSuccess bool
 }
 
 type GetOptions struct {
@@ -234,7 +243,7 @@ type DeleteOptions struct {
 
 type Watcher interface {
 	// Next blocks until an etcd event occurs, then returns a Response
-	// represeting that event. The behavior of Next depends on the
+	// representing that event. The behavior of Next depends on the
 	// WatcherOptions used to construct the Watcher. Next is designed to
 	// be called repeatedly, each time blocking until a subsequent event
 	// is available.
@@ -263,6 +272,10 @@ type Response struct {
 	// Index holds the cluster-level index at the time the Response was generated.
 	// This index is not tied to the Node(s) contained in this Response.
 	Index uint64 `json:"-"`
+
+	// ClusterID holds the cluster-level ID reported by the server.  This
+	// should be different for different etcd clusters.
+	ClusterID string `json:"-"`
 }
 
 type Node struct {
@@ -306,6 +319,7 @@ func (n *Node) TTLDuration() time.Duration {
 type Nodes []*Node
 
 // interfaces for sorting
+
 func (ns Nodes) Len() int           { return len(ns) }
 func (ns Nodes) Less(i, j int) bool { return ns[i].Key < ns[j].Key }
 func (ns Nodes) Swap(i, j int)      { ns[i], ns[j] = ns[j], ns[i] }
@@ -327,10 +341,16 @@ func (k *httpKeysAPI) Set(ctx context.Context, key, val string, opts *SetOptions
 		act.PrevIndex = opts.PrevIndex
 		act.PrevExist = opts.PrevExist
 		act.TTL = opts.TTL
+		act.Refresh = opts.Refresh
 		act.Dir = opts.Dir
+		act.NoValueOnSuccess = opts.NoValueOnSuccess
 	}
 
-	resp, body, err := k.client.Do(ctx, act)
+	doCtx := ctx
+	if act.PrevExist == PrevNoExist {
+		doCtx = context.WithValue(doCtx, &oneShotCtxValue, &oneShotCtxValue)
+	}
+	resp, body, err := k.client.Do(doCtx, act)
 	if err != nil {
 		return nil, err
 	}
@@ -378,7 +398,8 @@ func (k *httpKeysAPI) Delete(ctx context.Context, key string, opts *DeleteOption
 		act.Recursive = opts.Recursive
 	}
 
-	resp, body, err := k.client.Do(ctx, act)
+	doCtx := context.WithValue(ctx, &oneShotCtxValue, &oneShotCtxValue)
+	resp, body, err := k.client.Do(doCtx, act)
 	if err != nil {
 		return nil, err
 	}
@@ -511,14 +532,16 @@ func (w *waitAction) HTTPRequest(ep url.URL) *http.Request {
 }
 
 type setAction struct {
-	Prefix    string
-	Key       string
-	Value     string
-	PrevValue string
-	PrevIndex uint64
-	PrevExist PrevExistType
-	TTL       time.Duration
-	Dir       bool
+	Prefix           string
+	Key              string
+	Value            string
+	PrevValue        string
+	PrevIndex        uint64
+	PrevExist        PrevExistType
+	TTL              time.Duration
+	Refresh          bool
+	Dir              bool
+	NoValueOnSuccess bool
 }
 
 func (a *setAction) HTTPRequest(ep url.URL) *http.Request {
@@ -549,6 +572,13 @@ func (a *setAction) HTTPRequest(ep url.URL) *http.Request {
 		form.Add("ttl", strconv.FormatUint(uint64(a.TTL.Seconds()), 10))
 	}
 
+	if a.Refresh {
+		form.Add("refresh", "true")
+	}
+	if a.NoValueOnSuccess {
+		params.Set("noValueOnSuccess", strconv.FormatBool(a.NoValueOnSuccess))
+	}
+
 	u.RawQuery = params.Encode()
 	body := strings.NewReader(form.Encode())
 
@@ -639,6 +669,7 @@ func unmarshalSuccessfulKeysResponse(header http.Header, body []byte) (*Response
 			return nil, err
 		}
 	}
+	res.ClusterID = header.Get("X-Etcd-Cluster-ID")
 	return &res, nil
 }
 

vendor/github.com/coreos/etcd/client/members.go

@@ -1,4 +1,4 @@
-// Copyright 2015 CoreOS, Inc.
+// Copyright 2015 The etcd Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -29,6 +29,7 @@ import (
 
 var (
 	defaultV2MembersPrefix = "/v2/members"
+	defaultLeaderSuffix    = "/leader"
 )
 
 type Member struct {
@@ -105,6 +106,9 @@ type MembersAPI interface {
 
 	// Update instructs etcd to update an existing Member in the cluster.
 	Update(ctx context.Context, mID string, peerURLs []string) error
+
+	// Leader gets current leader of the cluster
+	Leader(ctx context.Context) (*Member, error)
 }
 
 type httpMembersAPI struct {
@@ -199,6 +203,25 @@ func (m *httpMembersAPI) Remove(ctx context.Context, memberID string) error {
 	return assertStatusCode(resp.StatusCode, http.StatusNoContent, http.StatusGone)
 }
 
+func (m *httpMembersAPI) Leader(ctx context.Context) (*Member, error) {
+	req := &membersAPIActionLeader{}
+	resp, body, err := m.client.Do(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := assertStatusCode(resp.StatusCode, http.StatusOK); err != nil {
+		return nil, err
+	}
+
+	var leader Member
+	if err := json.Unmarshal(body, &leader); err != nil {
+		return nil, err
+	}
+
+	return &leader, nil
+}
+
 type membersAPIActionList struct{}
 
 func (l *membersAPIActionList) HTTPRequest(ep url.URL) *http.Request {
@@ -255,6 +278,15 @@ func assertStatusCode(got int, want ...int) (err error) {
 	return fmt.Errorf("unexpected status code %d", got)
 }
 
+type membersAPIActionLeader struct{}
+
+func (l *membersAPIActionLeader) HTTPRequest(ep url.URL) *http.Request {
+	u := v2MembersURL(ep)
+	u.Path = path.Join(u.Path, defaultLeaderSuffix)
+	req, _ := http.NewRequest("GET", u.String(), nil)
+	return req
+}
+
 // v2MembersURL add the necessary path to the provided endpoint
 // to route requests to the default v2 members API.
 func v2MembersURL(ep url.URL) *url.URL {

vendor/github.com/coreos/etcd/client/srv.go

@@ -1,65 +0,0 @@
-// Copyright 2015 CoreOS, Inc.
-//
-// 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 client
-
-import (
-	"fmt"
-	"net"
-	"net/url"
-)
-
-var (
-	// indirection for testing
-	lookupSRV = net.LookupSRV
-)
-
-type srvDiscover struct{}
-
-// NewSRVDiscover constructs a new Dicoverer that uses the stdlib to lookup SRV records.
-func NewSRVDiscover() Discoverer {
-	return &srvDiscover{}
-}
-
-// Discover looks up the etcd servers for the domain.
-func (d *srvDiscover) Discover(domain string) ([]string, error) {
-	var urls []*url.URL
-
-	updateURLs := func(service, scheme string) error {
-		_, addrs, err := lookupSRV(service, "tcp", domain)
-		if err != nil {
-			return err
-		}
-		for _, srv := range addrs {
-			urls = append(urls, &url.URL{
-				Scheme: scheme,
-				Host:   net.JoinHostPort(srv.Target, fmt.Sprintf("%d", srv.Port)),
-			})
-		}
-		return nil
-	}
-
-	errHTTPS := updateURLs("etcd-server-ssl", "https")
-	errHTTP := updateURLs("etcd-server", "http")
-
-	if errHTTPS != nil && errHTTP != nil {
-		return nil, fmt.Errorf("dns lookup errors: %s and %s", errHTTPS, errHTTP)
-	}
-
-	endpoints := make([]string, len(urls))
-	for i := range urls {
-		endpoints[i] = urls[i].String()
-	}
-	return endpoints, nil
-}

vendor/github.com/coreos/etcd/client/util.go

@@ -0,0 +1,53 @@
+// Copyright 2016 The etcd Authors
+//
+// 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 client
+
+import (
+	"regexp"
+)
+
+var (
+	roleNotFoundRegExp *regexp.Regexp
+	userNotFoundRegExp *regexp.Regexp
+)
+
+func init() {
+	roleNotFoundRegExp = regexp.MustCompile("auth: Role .* does not exist.")
+	userNotFoundRegExp = regexp.MustCompile("auth: User .* does not exist.")
+}
+
+// IsKeyNotFound returns true if the error code is ErrorCodeKeyNotFound.
+func IsKeyNotFound(err error) bool {
+	if cErr, ok := err.(Error); ok {
+		return cErr.Code == ErrorCodeKeyNotFound
+	}
+	return false
+}
+
+// IsRoleNotFound returns true if the error means role not found of v2 API.
+func IsRoleNotFound(err error) bool {
+	if ae, ok := err.(authError); ok {
+		return roleNotFoundRegExp.MatchString(ae.Message)
+	}
+	return false
+}
+
+// IsUserNotFound returns true if the error means user not found of v2 API.
+func IsUserNotFound(err error) bool {
+	if ae, ok := err.(authError); ok {
+		return userNotFoundRegExp.MatchString(ae.Message)
+	}
+	return false
+}