diff --git a/auth/simple_token.go b/auth/simple_token.go
index 33e245027..b2579116b 100644
--- a/auth/simple_token.go
+++ b/auth/simple_token.go
@@ -20,6 +20,7 @@ package auth
 import (
 	"crypto/rand"
 	"math/big"
+	"sync"
 )
 
 const (
@@ -28,7 +29,8 @@ const (
 )
 
 var (
-	simpleTokens map[string]string // token -> user ID
+	simpleTokensMu sync.RWMutex
+	simpleTokens   map[string]string // token -> username
 )
 
 func init() {
@@ -50,7 +52,7 @@ func genSimpleToken() (string, error) {
 	return string(ret), nil
 }
 
-func genSimpleTokenForUser(userID string) (string, error) {
+func genSimpleTokenForUser(username string) (string, error) {
 	var token string
 	var err error
 
@@ -66,6 +68,9 @@ func genSimpleTokenForUser(userID string) (string, error) {
 		}
 	}
 
-	simpleTokens[token] = userID
+	simpleTokensMu.Lock()
+	simpleTokens[token] = username
+	simpleTokensMu.Unlock()
+
 	return token, nil
 }
diff --git a/auth/store.go b/auth/store.go
index be1c9a61c..20b60adee 100644
--- a/auth/store.go
+++ b/auth/store.go
@@ -19,6 +19,7 @@ import (
 	"errors"
 	"sort"
 	"strings"
+	"sync"
 
 	"github.com/coreos/etcd/auth/authpb"
 	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
@@ -76,10 +77,21 @@ type AuthStore interface {
 
 	// RoleGrant grants a permission to a role
 	RoleGrant(r *pb.AuthRoleGrantRequest) (*pb.AuthRoleGrantResponse, error)
+
+	// UsernameFromToken gets a username from the given Token
+	UsernameFromToken(token string) (string, bool)
+
+	// IsPutPermitted checks put permission of the user
+	IsPutPermitted(header *pb.RequestHeader, key string) bool
+
+	// IsRangePermitted checks range permission of the user
+	IsRangePermitted(header *pb.RequestHeader, key string) bool
 }
 
 type authStore struct {
-	be backend.Backend
+	be        backend.Backend
+	enabled   bool
+	enabledMu sync.RWMutex
 }
 
 func (as *authStore) AuthEnable() {
@@ -92,6 +104,10 @@ func (as *authStore) AuthEnable() {
 	tx.Unlock()
 	b.ForceCommit()
 
+	as.enabledMu.Lock()
+	as.enabled = true
+	as.enabledMu.Unlock()
+
 	plog.Noticef("Authentication enabled")
 }
 
@@ -105,6 +121,10 @@ func (as *authStore) AuthDisable() {
 	tx.Unlock()
 	b.ForceCommit()
 
+	as.enabledMu.Lock()
+	as.enabled = false
+	as.enabledMu.Unlock()
+
 	plog.Noticef("Authentication disabled")
 }
 
@@ -299,6 +319,13 @@ func (as *authStore) RoleAdd(r *pb.AuthRoleAddRequest) (*pb.AuthRoleAddResponse,
 	return &pb.AuthRoleAddResponse{}, nil
 }
 
+func (as *authStore) UsernameFromToken(token string) (string, bool) {
+	simpleTokensMu.RLock()
+	defer simpleTokensMu.RUnlock()
+	t, ok := simpleTokens[token]
+	return t, ok
+}
+
 type permSlice []*authpb.Permission
 
 func (perms permSlice) Len() int {
@@ -361,6 +388,77 @@ func (as *authStore) RoleGrant(r *pb.AuthRoleGrantRequest) (*pb.AuthRoleGrantRes
 	return &pb.AuthRoleGrantResponse{}, nil
 }
 
+func (as *authStore) isOpPermitted(userName string, key string, write bool, read bool) bool {
+	// TODO(mitake): this function would be costly so we need a caching mechanism
+	if !as.isAuthEnabled() {
+		return true
+	}
+
+	tx := as.be.BatchTx()
+	tx.Lock()
+	defer tx.Unlock()
+
+	_, vs := tx.UnsafeRange(authUsersBucketName, []byte(userName), nil, 0)
+	if len(vs) != 1 {
+		plog.Errorf("invalid user name %s for permission checking", userName)
+		return false
+	}
+
+	user := &authpb.User{}
+	err := user.Unmarshal(vs[0])
+	if err != nil {
+		plog.Errorf("failed to unmarshal user struct (name: %s): %s", userName, err)
+		return false
+	}
+
+	for _, roleName := range user.Roles {
+		_, vs := tx.UnsafeRange(authRolesBucketName, []byte(roleName), nil, 0)
+		if len(vs) != 1 {
+			plog.Errorf("invalid role name %s for permission checking", roleName)
+			return false
+		}
+
+		role := &authpb.Role{}
+		err := role.Unmarshal(vs[0])
+		if err != nil {
+			plog.Errorf("failed to unmarshal a role %s: %s", roleName, err)
+			return false
+		}
+
+		for _, perm := range role.KeyPermission {
+			if bytes.Equal(perm.Key, []byte(key)) {
+				if perm.PermType == authpb.READWRITE {
+					return true
+				}
+
+				if write && !read && perm.PermType == authpb.WRITE {
+					return true
+				}
+
+				if read && !write && perm.PermType == authpb.READ {
+					return true
+				}
+			}
+		}
+	}
+
+	return false
+}
+
+func (as *authStore) IsPutPermitted(header *pb.RequestHeader, key string) bool {
+	return as.isOpPermitted(header.Username, key, true, false)
+}
+
+func (as *authStore) IsRangePermitted(header *pb.RequestHeader, key string) bool {
+	return as.isOpPermitted(header.Username, key, false, true)
+}
+
+func (as *authStore) isAuthEnabled() bool {
+	as.enabledMu.RLock()
+	defer as.enabledMu.RUnlock()
+	return as.enabled
+}
+
 func NewAuthStore(be backend.Backend) *authStore {
 	tx := be.BatchTx()
 	tx.Lock()
diff --git a/etcdserver/api/v3rpc/rpctypes/error.go b/etcdserver/api/v3rpc/rpctypes/error.go
index 16909287f..67e0134f0 100644
--- a/etcdserver/api/v3rpc/rpctypes/error.go
+++ b/etcdserver/api/v3rpc/rpctypes/error.go
@@ -43,6 +43,7 @@ var (
 	ErrGRPCRoleAlreadyExist = grpc.Errorf(codes.FailedPrecondition, "etcdserver: role name already exists")
 	ErrGRPCRoleNotFound     = grpc.Errorf(codes.FailedPrecondition, "etcdserver: role name not found")
 	ErrGRPCAuthFailed       = grpc.Errorf(codes.InvalidArgument, "etcdserver: authentication failed, invalid user ID or password")
+	ErrGRPCPermissionDenied = grpc.Errorf(codes.FailedPrecondition, "etcdserver: permission denied")
 
 	ErrGRPCNoLeader   = grpc.Errorf(codes.Unavailable, "etcdserver: no leader")
 	ErrGRPCNotCapable = grpc.Errorf(codes.Unavailable, "etcdserver: not capable")
diff --git a/etcdserver/apply.go b/etcdserver/apply.go
index 53bed5343..2a5a315eb 100644
--- a/etcdserver/apply.go
+++ b/etcdserver/apply.go
@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"sort"
 
+	"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
 	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
 	"github.com/coreos/etcd/lease"
 	"github.com/coreos/etcd/mvcc"
@@ -72,9 +73,17 @@ func (s *EtcdServer) applyV3Request(r *pb.InternalRaftRequest) *applyResult {
 	ar := &applyResult{}
 	switch {
 	case r.Range != nil:
-		ar.resp, ar.err = s.applyV3.Range(noTxn, r.Range)
+		if s.AuthStore().IsRangePermitted(r.Header, string(r.Range.Key)) {
+			ar.resp, ar.err = s.applyV3.Range(noTxn, r.Range)
+		} else {
+			ar.err = rpctypes.ErrGRPCPermissionDenied
+		}
 	case r.Put != nil:
-		ar.resp, ar.err = s.applyV3.Put(noTxn, r.Put)
+		if s.AuthStore().IsPutPermitted(r.Header, string(r.Put.Key)) {
+			ar.resp, ar.err = s.applyV3.Put(noTxn, r.Put)
+		} else {
+			ar.err = rpctypes.ErrGRPCPermissionDenied
+		}
 	case r.DeleteRange != nil:
 		ar.resp, ar.err = s.applyV3.DeleteRange(noTxn, r.DeleteRange)
 	case r.Txn != nil:
diff --git a/etcdserver/errors.go b/etcdserver/errors.go
index 0c00512a2..1b9789fc8 100644
--- a/etcdserver/errors.go
+++ b/etcdserver/errors.go
@@ -30,6 +30,7 @@ var (
 	ErrNoLeader                   = errors.New("etcdserver: no leader")
 	ErrRequestTooLarge            = errors.New("etcdserver: request is too large")
 	ErrNoSpace                    = errors.New("etcdserver: no space")
+	ErrInvalidAuthToken           = errors.New("etcdserver: invalid auth token")
 )
 
 type DiscoveryError struct {
diff --git a/etcdserver/etcdserverpb/etcdserver.pb.go b/etcdserver/etcdserverpb/etcdserver.pb.go
index 872997b61..af5c25c6e 100644
--- a/etcdserver/etcdserverpb/etcdserver.pb.go
+++ b/etcdserver/etcdserverpb/etcdserver.pb.go
@@ -13,6 +13,7 @@
 	It has these top-level messages:
 		Request
 		Metadata
+		RequestHeader
 		InternalRaftRequest
 		EmptyResponse
 		ResponseHeader
diff --git a/etcdserver/etcdserverpb/raft_internal.pb.go b/etcdserver/etcdserverpb/raft_internal.pb.go
index 84a56ab14..d46ffe9d2 100644
--- a/etcdserver/etcdserverpb/raft_internal.pb.go
+++ b/etcdserver/etcdserverpb/raft_internal.pb.go
@@ -19,9 +19,21 @@ var _ = proto.Marshal
 var _ = fmt.Errorf
 var _ = math.Inf
 
+type RequestHeader struct {
+	ID uint64 `protobuf:"varint,1,opt,name=ID,json=iD,proto3" json:"ID,omitempty"`
+	// username is a username that is associated with an auth token of gRPC connection
+	Username string `protobuf:"bytes,2,opt,name=username,proto3" json:"username,omitempty"`
+}
+
+func (m *RequestHeader) Reset()                    { *m = RequestHeader{} }
+func (m *RequestHeader) String() string            { return proto.CompactTextString(m) }
+func (*RequestHeader) ProtoMessage()               {}
+func (*RequestHeader) Descriptor() ([]byte, []int) { return fileDescriptorRaftInternal, []int{0} }
+
 // An InternalRaftRequest is the union of all requests which can be
 // sent via raft.
 type InternalRaftRequest struct {
+	Header                 *RequestHeader                 `protobuf:"bytes,100,opt,name=header" json:"header,omitempty"`
 	ID                     uint64                         `protobuf:"varint,1,opt,name=ID,json=iD,proto3" json:"ID,omitempty"`
 	V2                     *Request                       `protobuf:"bytes,2,opt,name=v2" json:"v2,omitempty"`
 	Range                  *RangeRequest                  `protobuf:"bytes,3,opt,name=range" json:"range,omitempty"`
@@ -46,7 +58,7 @@ type InternalRaftRequest struct {
 func (m *InternalRaftRequest) Reset()                    { *m = InternalRaftRequest{} }
 func (m *InternalRaftRequest) String() string            { return proto.CompactTextString(m) }
 func (*InternalRaftRequest) ProtoMessage()               {}
-func (*InternalRaftRequest) Descriptor() ([]byte, []int) { return fileDescriptorRaftInternal, []int{0} }
+func (*InternalRaftRequest) Descriptor() ([]byte, []int) { return fileDescriptorRaftInternal, []int{1} }
 
 type EmptyResponse struct {
 }
@@ -54,12 +66,42 @@ type EmptyResponse struct {
 func (m *EmptyResponse) Reset()                    { *m = EmptyResponse{} }
 func (m *EmptyResponse) String() string            { return proto.CompactTextString(m) }
 func (*EmptyResponse) ProtoMessage()               {}
-func (*EmptyResponse) Descriptor() ([]byte, []int) { return fileDescriptorRaftInternal, []int{1} }
+func (*EmptyResponse) Descriptor() ([]byte, []int) { return fileDescriptorRaftInternal, []int{2} }
 
 func init() {
+	proto.RegisterType((*RequestHeader)(nil), "etcdserverpb.RequestHeader")
 	proto.RegisterType((*InternalRaftRequest)(nil), "etcdserverpb.InternalRaftRequest")
 	proto.RegisterType((*EmptyResponse)(nil), "etcdserverpb.EmptyResponse")
 }
+func (m *RequestHeader) Marshal() (data []byte, err error) {
+	size := m.Size()
+	data = make([]byte, size)
+	n, err := m.MarshalTo(data)
+	if err != nil {
+		return nil, err
+	}
+	return data[:n], nil
+}
+
+func (m *RequestHeader) MarshalTo(data []byte) (int, error) {
+	var i int
+	_ = i
+	var l int
+	_ = l
+	if m.ID != 0 {
+		data[i] = 0x8
+		i++
+		i = encodeVarintRaftInternal(data, i, uint64(m.ID))
+	}
+	if len(m.Username) > 0 {
+		data[i] = 0x12
+		i++
+		i = encodeVarintRaftInternal(data, i, uint64(len(m.Username)))
+		i += copy(data[i:], m.Username)
+	}
+	return i, nil
+}
+
 func (m *InternalRaftRequest) Marshal() (data []byte, err error) {
 	size := m.Size()
 	data = make([]byte, size)
@@ -268,6 +310,18 @@ func (m *InternalRaftRequest) MarshalTo(data []byte) (int, error) {
 		}
 		i += n18
 	}
+	if m.Header != nil {
+		data[i] = 0xa2
+		i++
+		data[i] = 0x6
+		i++
+		i = encodeVarintRaftInternal(data, i, uint64(m.Header.Size()))
+		n19, err := m.Header.MarshalTo(data[i:])
+		if err != nil {
+			return 0, err
+		}
+		i += n19
+	}
 	return i, nil
 }
 
@@ -316,6 +370,19 @@ func encodeVarintRaftInternal(data []byte, offset int, v uint64) int {
 	data[offset] = uint8(v)
 	return offset + 1
 }
+func (m *RequestHeader) Size() (n int) {
+	var l int
+	_ = l
+	if m.ID != 0 {
+		n += 1 + sovRaftInternal(uint64(m.ID))
+	}
+	l = len(m.Username)
+	if l > 0 {
+		n += 1 + l + sovRaftInternal(uint64(l))
+	}
+	return n
+}
+
 func (m *InternalRaftRequest) Size() (n int) {
 	var l int
 	_ = l
@@ -394,6 +461,10 @@ func (m *InternalRaftRequest) Size() (n int) {
 		l = m.Alarm.Size()
 		n += 2 + l + sovRaftInternal(uint64(l))
 	}
+	if m.Header != nil {
+		l = m.Header.Size()
+		n += 2 + l + sovRaftInternal(uint64(l))
+	}
 	return n
 }
 
@@ -416,6 +487,104 @@ func sovRaftInternal(x uint64) (n int) {
 func sozRaftInternal(x uint64) (n int) {
 	return sovRaftInternal(uint64((x << 1) ^ uint64((int64(x) >> 63))))
 }
+func (m *RequestHeader) Unmarshal(data []byte) error {
+	l := len(data)
+	iNdEx := 0
+	for iNdEx < l {
+		preIndex := iNdEx
+		var wire uint64
+		for shift := uint(0); ; shift += 7 {
+			if shift >= 64 {
+				return ErrIntOverflowRaftInternal
+			}
+			if iNdEx >= l {
+				return io.ErrUnexpectedEOF
+			}
+			b := data[iNdEx]
+			iNdEx++
+			wire |= (uint64(b) & 0x7F) << shift
+			if b < 0x80 {
+				break
+			}
+		}
+		fieldNum := int32(wire >> 3)
+		wireType := int(wire & 0x7)
+		if wireType == 4 {
+			return fmt.Errorf("proto: RequestHeader: wiretype end group for non-group")
+		}
+		if fieldNum <= 0 {
+			return fmt.Errorf("proto: RequestHeader: illegal tag %d (wire type %d)", fieldNum, wire)
+		}
+		switch fieldNum {
+		case 1:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field ID", wireType)
+			}
+			m.ID = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaftInternal
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				m.ID |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+		case 2:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Username", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaftInternal
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				stringLen |= (uint64(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthRaftInternal
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Username = string(data[iNdEx:postIndex])
+			iNdEx = postIndex
+		default:
+			iNdEx = preIndex
+			skippy, err := skipRaftInternal(data[iNdEx:])
+			if err != nil {
+				return err
+			}
+			if skippy < 0 {
+				return ErrInvalidLengthRaftInternal
+			}
+			if (iNdEx + skippy) > l {
+				return io.ErrUnexpectedEOF
+			}
+			iNdEx += skippy
+		}
+	}
+
+	if iNdEx > l {
+		return io.ErrUnexpectedEOF
+	}
+	return nil
+}
 func (m *InternalRaftRequest) Unmarshal(data []byte) error {
 	l := len(data)
 	iNdEx := 0
@@ -1058,6 +1227,39 @@ func (m *InternalRaftRequest) Unmarshal(data []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 100:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Header", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowRaftInternal
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := data[iNdEx]
+				iNdEx++
+				msglen |= (int(b) & 0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthRaftInternal
+			}
+			postIndex := iNdEx + msglen
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			if m.Header == nil {
+				m.Header = &RequestHeader{}
+			}
+			if err := m.Header.Unmarshal(data[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipRaftInternal(data[iNdEx:])
@@ -1235,40 +1437,43 @@ var (
 )
 
 var fileDescriptorRaftInternal = []byte{
-	// 550 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x74, 0x94, 0xdf, 0x6e, 0xd3, 0x30,
-	0x14, 0xc6, 0x69, 0xf7, 0x07, 0xea, 0xfe, 0xc5, 0x05, 0x64, 0x7a, 0x31, 0x46, 0x11, 0x12, 0x02,
-	0xa9, 0xa0, 0xf1, 0x00, 0x50, 0xda, 0x0a, 0x0d, 0x81, 0x34, 0x45, 0x70, 0x1d, 0xb9, 0xc9, 0x59,
-	0x57, 0x91, 0x26, 0xc1, 0x71, 0xcb, 0x78, 0x39, 0xae, 0x77, 0xc9, 0x23, 0x00, 0x4f, 0x32, 0xfb,
-	0x38, 0x71, 0x9a, 0xcd, 0xbd, 0x88, 0x94, 0x7c, 0xe7, 0x3b, 0xbf, 0xf3, 0xd9, 0xb1, 0x4c, 0xfa,
-	0x82, 0x9f, 0x4b, 0x7f, 0x19, 0x4b, 0x10, 0x31, 0x8f, 0x46, 0xa9, 0x48, 0x64, 0x42, 0x5b, 0x20,
-	0x83, 0x30, 0x03, 0xb1, 0x01, 0x91, 0xce, 0x07, 0x0f, 0x16, 0xc9, 0x22, 0xc1, 0xc2, 0x6b, 0xfd,
-	0x66, 0x3c, 0x83, 0x5e, 0xe9, 0xc9, 0x95, 0x86, 0x48, 0x03, 0xf3, 0x3a, 0xfc, 0xdd, 0x20, 0xfd,
-	0xd3, 0x9c, 0xe9, 0xa9, 0x01, 0x1e, 0xfc, 0x58, 0x43, 0x26, 0x69, 0x87, 0xd4, 0x4f, 0xa7, 0xac,
-	0x76, 0x5c, 0x7b, 0xb1, 0xef, 0xd5, 0x97, 0x53, 0xfa, 0x9c, 0xd4, 0x37, 0x27, 0xac, 0xae, 0xbe,
-	0x9b, 0x27, 0x0f, 0x47, 0xdb, 0x53, 0x47, 0x79, 0x8b, 0xa7, 0x0c, 0xf4, 0x0d, 0x39, 0x10, 0x3c,
-	0x5e, 0x00, 0xdb, 0x43, 0xe7, 0xe0, 0x86, 0x53, 0x97, 0x0a, 0xbb, 0x31, 0xd2, 0x97, 0x64, 0x2f,
-	0x5d, 0x4b, 0xb6, 0x8f, 0x7e, 0x56, 0xf5, 0x9f, 0xad, 0x8b, 0x3c, 0x9e, 0x36, 0xd1, 0x09, 0x69,
-	0x85, 0x10, 0x81, 0x04, 0xdf, 0x0c, 0x39, 0xc0, 0xa6, 0xe3, 0x6a, 0xd3, 0x14, 0x1d, 0x95, 0x51,
-	0xcd, 0xb0, 0xd4, 0xf4, 0x40, 0x79, 0x19, 0xb3, 0x43, 0xd7, 0xc0, 0xaf, 0x97, 0xb1, 0x1d, 0xa8,
-	0x4c, 0xf4, 0x1d, 0x21, 0x41, 0xb2, 0x4a, 0x79, 0x20, 0x97, 0x49, 0xcc, 0xee, 0x62, 0xcb, 0x93,
-	0x6a, 0xcb, 0xc4, 0xd6, 0x8b, 0xce, 0xad, 0x16, 0xfa, 0x9e, 0x34, 0x23, 0xe0, 0x19, 0xf8, 0x0b,
-	0x95, 0x58, 0xb2, 0x7b, 0x2e, 0xc2, 0x67, 0x6d, 0xf8, 0xa8, 0xeb, 0x96, 0x10, 0x59, 0x49, 0xaf,
-	0xd9, 0x10, 0x04, 0x6c, 0x92, 0xef, 0xc0, 0x1a, 0xae, 0x35, 0x23, 0xc2, 0x43, 0x83, 0x5d, 0x73,
-	0x54, 0x6a, 0x3a, 0x06, 0x5f, 0xcb, 0x0b, 0x1f, 0x62, 0x3e, 0x8f, 0x80, 0x11, 0x57, 0x8c, 0xb1,
-	0x32, 0xcc, 0xb0, 0x6e, 0x63, 0x70, 0x2b, 0xe9, 0x18, 0x48, 0x08, 0x97, 0x19, 0x22, 0x9a, 0xae,
-	0x18, 0x1a, 0x31, 0x35, 0x06, 0x1b, 0x83, 0x97, 0x1a, 0x9d, 0x92, 0x36, 0x42, 0xd6, 0xaa, 0xc3,
-	0xe7, 0x61, 0xc8, 0x5a, 0xbb, 0x28, 0xdf, 0xd4, 0xd7, 0x38, 0x0c, 0x2b, 0x94, 0x5c, 0xa3, 0x5f,
-	0x48, 0xaf, 0xa4, 0x98, 0x3f, 0xcb, 0xda, 0x08, 0x7a, 0xe6, 0x06, 0xe5, 0x27, 0x22, 0x67, 0x75,
-	0x78, 0x45, 0xa6, 0xe7, 0xe4, 0x71, 0x89, 0x0b, 0x2e, 0xf4, 0x19, 0xf1, 0x53, 0x9e, 0x65, 0x3f,
-	0x13, 0x11, 0xb2, 0x0e, 0x72, 0x5f, 0xb9, 0xb9, 0x13, 0x34, 0x9f, 0xe5, 0xde, 0x82, 0xff, 0x88,
-	0x3b, 0xcb, 0xf4, 0x13, 0xe9, 0x96, 0x73, 0xcc, 0x71, 0xe8, 0x22, 0x7d, 0xe8, 0xa6, 0x57, 0x4e,
-	0x44, 0x9b, 0x6f, 0xab, 0x76, 0x23, 0x45, 0x12, 0x01, 0x6e, 0x64, 0x6f, 0xd7, 0x46, 0x7a, 0xca,
-	0x71, 0x73, 0x23, 0x73, 0xcd, 0x26, 0x42, 0x8a, 0x49, 0x74, 0x7f, 0x57, 0x22, 0xdd, 0x73, 0x3b,
-	0x91, 0x55, 0xe9, 0xcc, 0x9c, 0x0f, 0x88, 0xe5, 0x32, 0xe0, 0xea, 0x87, 0x50, 0x04, 0x3d, 0xbd,
-	0x0d, 0x2a, 0x1c, 0x05, 0xa7, 0xd2, 0xa6, 0xef, 0x0f, 0x1e, 0x71, 0xb1, 0x62, 0x7d, 0xd7, 0xfd,
-	0x31, 0xd6, 0x25, 0x7b, 0x7f, 0xa0, 0x71, 0xd8, 0x25, 0xed, 0xd9, 0x2a, 0x95, 0xbf, 0x3c, 0xc8,
-	0xd2, 0x24, 0xce, 0xe0, 0x43, 0xef, 0xea, 0xdf, 0xd1, 0x9d, 0xab, 0xff, 0x47, 0xb5, 0x3f, 0xea,
-	0xf9, 0xab, 0x9e, 0xf9, 0x21, 0x5e, 0x75, 0x6f, 0xaf, 0x03, 0x00, 0x00, 0xff, 0xff, 0xe8, 0x6d,
-	0xd8, 0x5b, 0x42, 0x05, 0x00, 0x00,
+	// 593 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0x74, 0x94, 0xcf, 0x6e, 0xd3, 0x40,
+	0x10, 0xc6, 0x69, 0xda, 0x86, 0x66, 0xf3, 0x97, 0x0d, 0xa0, 0x25, 0x48, 0xa5, 0x04, 0x21, 0x21,
+	0x90, 0x02, 0x6a, 0x8f, 0x1c, 0x20, 0x24, 0x11, 0x14, 0x81, 0x54, 0x59, 0x70, 0xb6, 0x36, 0xf6,
+	0x34, 0x89, 0x70, 0x6c, 0xb3, 0xde, 0x84, 0xf2, 0x86, 0x3d, 0xf2, 0x08, 0xc0, 0x2b, 0xf0, 0x02,
+	0x78, 0x67, 0xed, 0x75, 0xdc, 0x6c, 0x0e, 0x96, 0xec, 0x99, 0x6f, 0x7e, 0xf3, 0xed, 0x7a, 0x34,
+	0xa4, 0x2b, 0xf8, 0xa5, 0x74, 0x17, 0xa1, 0x04, 0x11, 0xf2, 0x60, 0x10, 0x8b, 0x48, 0x46, 0xb4,
+	0x01, 0xd2, 0xf3, 0x13, 0x10, 0x6b, 0x10, 0xf1, 0xb4, 0x77, 0x77, 0x16, 0xcd, 0x22, 0x4c, 0xbc,
+	0x54, 0x6f, 0x5a, 0xd3, 0xeb, 0x14, 0x9a, 0x2c, 0x52, 0x13, 0xb1, 0xa7, 0x5f, 0xfb, 0xaf, 0x49,
+	0xd3, 0x81, 0xef, 0x2b, 0x48, 0xe4, 0x07, 0xe0, 0x3e, 0x08, 0xda, 0x22, 0x95, 0xf3, 0x31, 0xdb,
+	0x3b, 0xd9, 0x7b, 0x76, 0xe0, 0x54, 0x16, 0x63, 0xda, 0x23, 0x47, 0xab, 0x44, 0xb5, 0x5c, 0x02,
+	0xab, 0xa4, 0xd1, 0x9a, 0x63, 0xbe, 0xfb, 0xff, 0x6a, 0xa4, 0x7b, 0x9e, 0x19, 0x72, 0x52, 0x77,
+	0x19, 0x69, 0x8b, 0xf1, 0x94, 0x54, 0xd6, 0xa7, 0x58, 0x5d, 0x3f, 0xbd, 0x37, 0xd8, 0xb4, 0x3c,
+	0xc8, 0x4a, 0x9c, 0x54, 0x40, 0x5f, 0x91, 0x43, 0xc1, 0xc3, 0x19, 0xb0, 0x7d, 0x54, 0xf6, 0x6e,
+	0x28, 0x55, 0x2a, 0x97, 0x6b, 0x21, 0x7d, 0x4e, 0xf6, 0xe3, 0x95, 0x64, 0x07, 0xa8, 0x67, 0x65,
+	0xfd, 0xc5, 0x2a, 0xf7, 0xe3, 0x28, 0x11, 0x1d, 0x91, 0x86, 0x0f, 0x01, 0x48, 0x70, 0x75, 0x93,
+	0x43, 0x2c, 0x3a, 0x29, 0x17, 0x8d, 0x51, 0x51, 0x6a, 0x55, 0xf7, 0x8b, 0x98, 0x6a, 0x28, 0xaf,
+	0x42, 0x56, 0xb5, 0x35, 0xfc, 0x72, 0x15, 0x9a, 0x86, 0xa9, 0x88, 0xbe, 0x21, 0xc4, 0x8b, 0x96,
+	0x31, 0xf7, 0xe4, 0x22, 0x0a, 0xd9, 0x6d, 0x2c, 0x79, 0x54, 0x2e, 0x19, 0x99, 0x7c, 0x5e, 0xb9,
+	0x51, 0x42, 0xdf, 0x92, 0x7a, 0x00, 0x3c, 0x01, 0x77, 0x96, 0x3a, 0x96, 0xec, 0xc8, 0x46, 0xf8,
+	0xa4, 0x04, 0xef, 0x55, 0xde, 0x10, 0x02, 0x13, 0x52, 0x67, 0xd6, 0x04, 0x01, 0xeb, 0xe8, 0x1b,
+	0xb0, 0x9a, 0xed, 0xcc, 0x88, 0x70, 0x50, 0x60, 0xce, 0x1c, 0x14, 0x31, 0x65, 0x83, 0xaf, 0xe4,
+	0xdc, 0x85, 0x90, 0x4f, 0x03, 0x60, 0xc4, 0x66, 0x63, 0x98, 0x0a, 0x26, 0x98, 0x37, 0x36, 0xb8,
+	0x09, 0x29, 0x1b, 0x48, 0xf0, 0x17, 0x09, 0x22, 0xea, 0x36, 0x1b, 0x0a, 0x31, 0xd6, 0x02, 0x63,
+	0x83, 0x17, 0x31, 0x3a, 0x26, 0x4d, 0x84, 0xa8, 0xe9, 0x73, 0xb9, 0xef, 0xb3, 0xc6, 0x2e, 0xca,
+	0xd7, 0xf4, 0x6b, 0xe8, 0xfb, 0x25, 0x4a, 0x16, 0xa3, 0x9f, 0x49, 0xa7, 0xa0, 0xe8, 0x3f, 0xcb,
+	0x9a, 0x08, 0x7a, 0x62, 0x07, 0x65, 0x13, 0x91, 0xb1, 0x5a, 0xbc, 0x14, 0xa6, 0x97, 0xe4, 0x41,
+	0x81, 0xf3, 0xe6, 0x6a, 0x46, 0xdc, 0x98, 0x27, 0xc9, 0x8f, 0x48, 0xf8, 0xac, 0x85, 0xdc, 0x17,
+	0x76, 0xee, 0x08, 0xc5, 0x17, 0x99, 0x36, 0xe7, 0xdf, 0xe7, 0xd6, 0x34, 0xfd, 0x48, 0xda, 0x45,
+	0x1f, 0x3d, 0x0e, 0x6d, 0xa4, 0xf7, 0xed, 0xf4, 0xd2, 0x44, 0x34, 0xf9, 0x66, 0xd4, 0x5c, 0xa4,
+	0x88, 0x02, 0xc0, 0x8b, 0xec, 0xec, 0xba, 0x48, 0x27, 0x55, 0xdc, 0xbc, 0xc8, 0x2c, 0x66, 0x1c,
+	0x21, 0x45, 0x3b, 0xba, 0xb3, 0xcb, 0x91, 0xaa, 0xd9, 0x76, 0x64, 0xa2, 0x74, 0xa2, 0xe7, 0x03,
+	0x42, 0xb9, 0xf0, 0x78, 0xfa, 0x43, 0x28, 0x82, 0x1e, 0x6f, 0x83, 0x72, 0x45, 0xce, 0x29, 0x95,
+	0xa9, 0xfd, 0xc1, 0x03, 0x2e, 0x96, 0xac, 0x6b, 0xdb, 0x1f, 0x43, 0x95, 0x32, 0xfb, 0x03, 0x85,
+	0xf4, 0x8c, 0x54, 0xe7, 0xb8, 0xf6, 0x98, 0x8f, 0x25, 0x0f, 0xad, 0xcb, 0x49, 0x6f, 0x46, 0x27,
+	0x93, 0xf6, 0xdb, 0xa4, 0x39, 0x59, 0xc6, 0xf2, 0xa7, 0x03, 0x49, 0x1c, 0x85, 0x09, 0xbc, 0xeb,
+	0x5c, 0xff, 0x39, 0xbe, 0x75, 0xfd, 0xf7, 0x78, 0xef, 0x57, 0xfa, 0xfc, 0x4e, 0x9f, 0x69, 0x15,
+	0x97, 0xeb, 0xd9, 0xff, 0x00, 0x00, 0x00, 0xff, 0xff, 0xb1, 0xad, 0x4e, 0x86, 0xb4, 0x05, 0x00,
+	0x00,
 }
diff --git a/etcdserver/etcdserverpb/raft_internal.proto b/etcdserver/etcdserverpb/raft_internal.proto
index 042279efe..df0872808 100644
--- a/etcdserver/etcdserverpb/raft_internal.proto
+++ b/etcdserver/etcdserverpb/raft_internal.proto
@@ -10,10 +10,18 @@ option (gogoproto.sizer_all) = true;
 option (gogoproto.unmarshaler_all) = true;
 option (gogoproto.goproto_getters_all) = false;
 
+message RequestHeader {
+  uint64 ID = 1;
+  // username is a username that is associated with an auth token of gRPC connection
+  string username = 2;
+}
+
 // An InternalRaftRequest is the union of all requests which can be
 // sent via raft.
 message InternalRaftRequest {
+  RequestHeader header = 100;
   uint64 ID = 1;
+
   Request v2 = 2;
 
   RangeRequest range = 3;
diff --git a/etcdserver/server.go b/etcdserver/server.go
index 056b6f643..5d3e75927 100644
--- a/etcdserver/server.go
+++ b/etcdserver/server.go
@@ -1029,11 +1029,17 @@ func (s *EtcdServer) applyEntryNormal(e *raftpb.Entry) {
 	if e.Index <= s.consistIndex.ConsistentIndex() {
 		return
 	}
+
+	id := raftReq.ID
+	if id == 0 {
+		id = raftReq.Header.ID
+	}
+
 	// set the consistent index of current executing entry
 	s.consistIndex.setConsistentIndex(e.Index)
 	ar := s.applyV3Request(&raftReq)
 	if ar.err != ErrNoSpace || len(s.alarmStore.Get(pb.AlarmType_NOSPACE)) > 0 {
-		s.w.Trigger(raftReq.ID, ar)
+		s.w.Trigger(id, ar)
 		return
 	}
 
@@ -1046,7 +1052,7 @@ func (s *EtcdServer) applyEntryNormal(e *raftpb.Entry) {
 		}
 		r := pb.InternalRaftRequest{Alarm: a}
 		s.processInternalRaftRequest(context.TODO(), r)
-		s.w.Trigger(raftReq.ID, ar)
+		s.w.Trigger(id, ar)
 	}()
 }
 
diff --git a/etcdserver/v3_server.go b/etcdserver/v3_server.go
index 3b7bf1eb3..962bf088c 100644
--- a/etcdserver/v3_server.go
+++ b/etcdserver/v3_server.go
@@ -22,6 +22,7 @@ import (
 	"github.com/coreos/etcd/lease/leasehttp"
 	"github.com/coreos/etcd/mvcc"
 	"golang.org/x/net/context"
+	"google.golang.org/grpc/metadata"
 )
 
 const (
@@ -75,7 +76,10 @@ func (s *EtcdServer) Range(ctx context.Context, r *pb.RangeRequest) (*pb.RangeRe
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.RangeResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.RangeResponse), nil
 }
 
 func (s *EtcdServer) Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse, error) {
@@ -83,7 +87,10 @@ func (s *EtcdServer) Put(ctx context.Context, r *pb.PutRequest) (*pb.PutResponse
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.PutResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.PutResponse), nil
 }
 
 func (s *EtcdServer) DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest) (*pb.DeleteRangeResponse, error) {
@@ -91,7 +98,10 @@ func (s *EtcdServer) DeleteRange(ctx context.Context, r *pb.DeleteRangeRequest)
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.DeleteRangeResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.DeleteRangeResponse), nil
 }
 
 func (s *EtcdServer) Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse, error) {
@@ -103,7 +113,10 @@ func (s *EtcdServer) Txn(ctx context.Context, r *pb.TxnRequest) (*pb.TxnResponse
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.TxnResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.TxnResponse), nil
 }
 
 func isTxnSerializable(r *pb.TxnRequest) bool {
@@ -134,6 +147,9 @@ func (s *EtcdServer) Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.
 	if err != nil {
 		return nil, err
 	}
+	if result.err != nil {
+		return nil, result.err
+	}
 	resp := result.resp.(*pb.CompactionResponse)
 	if resp == nil {
 		resp = &pb.CompactionResponse{}
@@ -142,7 +158,7 @@ func (s *EtcdServer) Compact(ctx context.Context, r *pb.CompactionRequest) (*pb.
 		resp.Header = &pb.ResponseHeader{}
 	}
 	resp.Header.Revision = s.kv.Rev()
-	return resp, result.err
+	return resp, nil
 }
 
 func (s *EtcdServer) LeaseGrant(ctx context.Context, r *pb.LeaseGrantRequest) (*pb.LeaseGrantResponse, error) {
@@ -155,7 +171,10 @@ func (s *EtcdServer) LeaseGrant(ctx context.Context, r *pb.LeaseGrantRequest) (*
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.LeaseGrantResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.LeaseGrantResponse), nil
 }
 
 func (s *EtcdServer) LeaseRevoke(ctx context.Context, r *pb.LeaseRevokeRequest) (*pb.LeaseRevokeResponse, error) {
@@ -163,7 +182,10 @@ func (s *EtcdServer) LeaseRevoke(ctx context.Context, r *pb.LeaseRevokeRequest)
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.LeaseRevokeResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.LeaseRevokeResponse), nil
 }
 
 func (s *EtcdServer) LeaseRenew(id lease.LeaseID) (int64, error) {
@@ -206,7 +228,10 @@ func (s *EtcdServer) Alarm(ctx context.Context, r *pb.AlarmRequest) (*pb.AlarmRe
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AlarmResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AlarmResponse), nil
 }
 
 func (s *EtcdServer) AuthEnable(ctx context.Context, r *pb.AuthEnableRequest) (*pb.AuthEnableResponse, error) {
@@ -214,7 +239,10 @@ func (s *EtcdServer) AuthEnable(ctx context.Context, r *pb.AuthEnableRequest) (*
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthEnableResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthEnableResponse), nil
 }
 
 func (s *EtcdServer) AuthDisable(ctx context.Context, r *pb.AuthDisableRequest) (*pb.AuthDisableResponse, error) {
@@ -222,7 +250,10 @@ func (s *EtcdServer) AuthDisable(ctx context.Context, r *pb.AuthDisableRequest)
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthDisableResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthDisableResponse), nil
 }
 
 func (s *EtcdServer) Authenticate(ctx context.Context, r *pb.AuthenticateRequest) (*pb.AuthenticateResponse, error) {
@@ -230,7 +261,10 @@ func (s *EtcdServer) Authenticate(ctx context.Context, r *pb.AuthenticateRequest
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthenticateResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthenticateResponse), nil
 }
 
 func (s *EtcdServer) UserAdd(ctx context.Context, r *pb.AuthUserAddRequest) (*pb.AuthUserAddResponse, error) {
@@ -238,7 +272,10 @@ func (s *EtcdServer) UserAdd(ctx context.Context, r *pb.AuthUserAddRequest) (*pb
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthUserAddResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthUserAddResponse), nil
 }
 
 func (s *EtcdServer) UserDelete(ctx context.Context, r *pb.AuthUserDeleteRequest) (*pb.AuthUserDeleteResponse, error) {
@@ -246,7 +283,10 @@ func (s *EtcdServer) UserDelete(ctx context.Context, r *pb.AuthUserDeleteRequest
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthUserDeleteResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthUserDeleteResponse), nil
 }
 
 func (s *EtcdServer) UserChangePassword(ctx context.Context, r *pb.AuthUserChangePasswordRequest) (*pb.AuthUserChangePasswordResponse, error) {
@@ -254,7 +294,10 @@ func (s *EtcdServer) UserChangePassword(ctx context.Context, r *pb.AuthUserChang
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthUserChangePasswordResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthUserChangePasswordResponse), nil
 }
 
 func (s *EtcdServer) UserGrant(ctx context.Context, r *pb.AuthUserGrantRequest) (*pb.AuthUserGrantResponse, error) {
@@ -262,7 +305,10 @@ func (s *EtcdServer) UserGrant(ctx context.Context, r *pb.AuthUserGrantRequest)
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthUserGrantResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthUserGrantResponse), nil
 }
 
 func (s *EtcdServer) RoleAdd(ctx context.Context, r *pb.AuthRoleAddRequest) (*pb.AuthRoleAddResponse, error) {
@@ -270,7 +316,10 @@ func (s *EtcdServer) RoleAdd(ctx context.Context, r *pb.AuthRoleAddRequest) (*pb
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthRoleAddResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthRoleAddResponse), nil
 }
 
 func (s *EtcdServer) RoleGrant(ctx context.Context, r *pb.AuthRoleGrantRequest) (*pb.AuthRoleGrantResponse, error) {
@@ -278,11 +327,38 @@ func (s *EtcdServer) RoleGrant(ctx context.Context, r *pb.AuthRoleGrantRequest)
 	if err != nil {
 		return nil, err
 	}
-	return result.resp.(*pb.AuthRoleGrantResponse), result.err
+	if result.err != nil {
+		return nil, result.err
+	}
+	return result.resp.(*pb.AuthRoleGrantResponse), nil
+}
+
+func (s *EtcdServer) usernameFromCtx(ctx context.Context) (string, error) {
+	md, mdexist := metadata.FromContext(ctx)
+	if mdexist {
+		token, texist := md["token"]
+		if texist {
+			username, uexist := s.AuthStore().UsernameFromToken(token[0])
+			if !uexist {
+				plog.Warningf("invalid auth token: %s", token[0])
+				return "", ErrInvalidAuthToken
+			}
+			return username, nil
+		}
+	}
+
+	return "", nil
 }
 
 func (s *EtcdServer) processInternalRaftRequest(ctx context.Context, r pb.InternalRaftRequest) (*applyResult, error) {
-	r.ID = s.reqIDGen.Next()
+	r.Header = &pb.RequestHeader{
+		ID: s.reqIDGen.Next(),
+	}
+	username, err := s.usernameFromCtx(ctx)
+	if err != nil {
+		return nil, err
+	}
+	r.Header.Username = username
 
 	data, err := r.Marshal()
 	if err != nil {
@@ -293,7 +369,11 @@ func (s *EtcdServer) processInternalRaftRequest(ctx context.Context, r pb.Intern
 		return nil, ErrRequestTooLarge
 	}
 
-	ch := s.w.Register(r.ID)
+	id := r.ID
+	if id == 0 {
+		id = r.Header.ID
+	}
+	ch := s.w.Register(id)
 
 	cctx, cancel := context.WithTimeout(ctx, maxV3RequestTimeout)
 	defer cancel()
@@ -304,7 +384,7 @@ func (s *EtcdServer) processInternalRaftRequest(ctx context.Context, r pb.Intern
 	case x := <-ch:
 		return x.(*applyResult), nil
 	case <-cctx.Done():
-		s.w.Trigger(r.ID, nil) // GC wait
+		s.w.Trigger(id, nil) // GC wait
 		return nil, cctx.Err()
 	case <-s.done:
 		return nil, ErrStopped