etcdserver/*: add 'ErrNotLeader'

Signed-off-by: Gyu-Ho Lee <gyuhox@gmail.com>

etcdserver/api/v3rpc/rpctypes/error.go

@@ -59,6 +59,7 @@ var (
 	ErrGRPCInvalidAuthMgmt      = grpc.Errorf(codes.InvalidArgument, "etcdserver: invalid auth management")
 
 	ErrGRPCNoLeader                   = grpc.Errorf(codes.Unavailable, "etcdserver: no leader")
+	ErrGRPCNotLeader                  = grpc.Errorf(codes.Unavailable, "etcdserver: not leader")
 	ErrGRPCNotCapable                 = grpc.Errorf(codes.Unavailable, "etcdserver: not capable")
 	ErrGRPCStopped                    = grpc.Errorf(codes.Unavailable, "etcdserver: server stopped")
 	ErrGRPCTimeout                    = grpc.Errorf(codes.Unavailable, "etcdserver: request timed out")
@@ -106,6 +107,7 @@ var (
 		grpc.ErrorDesc(ErrGRPCInvalidAuthMgmt):      ErrGRPCInvalidAuthMgmt,
 
 		grpc.ErrorDesc(ErrGRPCNoLeader):                   ErrGRPCNoLeader,
+		grpc.ErrorDesc(ErrGRPCNotLeader):                  ErrGRPCNotLeader,
 		grpc.ErrorDesc(ErrGRPCNotCapable):                 ErrGRPCNotCapable,
 		grpc.ErrorDesc(ErrGRPCStopped):                    ErrGRPCStopped,
 		grpc.ErrorDesc(ErrGRPCTimeout):                    ErrGRPCTimeout,
@@ -153,6 +155,7 @@ var (
 	ErrInvalidAuthMgmt      = Error(ErrGRPCInvalidAuthMgmt)
 
 	ErrNoLeader                   = Error(ErrGRPCNoLeader)
+	ErrNotLeader                  = Error(ErrGRPCNotLeader)
 	ErrNotCapable                 = Error(ErrGRPCNotCapable)
 	ErrStopped                    = Error(ErrGRPCStopped)
 	ErrTimeout                    = Error(ErrGRPCTimeout)

etcdserver/api/v3rpc/util.go

@@ -39,6 +39,7 @@ var toGRPCErrorMap = map[error]error{
 	etcdserver.ErrTooManyRequests: rpctypes.ErrTooManyRequests,
 
 	etcdserver.ErrNoLeader:                   rpctypes.ErrGRPCNoLeader,
+	etcdserver.ErrNotLeader:                  rpctypes.ErrGRPCNotLeader,
 	etcdserver.ErrStopped:                    rpctypes.ErrGRPCStopped,
 	etcdserver.ErrTimeout:                    rpctypes.ErrGRPCTimeout,
 	etcdserver.ErrTimeoutDueToLeaderFail:     rpctypes.ErrGRPCTimeoutDueToLeaderFail,

etcdserver/errors.go

@@ -29,6 +29,7 @@ var (
 	ErrTimeoutLeaderTransfer      = errors.New("etcdserver: request timed out, leader transfer took too long")
 	ErrNotEnoughStartedMembers    = errors.New("etcdserver: re-configuration failed due to not enough started members")
 	ErrNoLeader                   = errors.New("etcdserver: no leader")
+	ErrNotLeader                  = errors.New("etcdserver: not leader")
 	ErrRequestTooLarge            = errors.New("etcdserver: request is too large")
 	ErrNoSpace                    = errors.New("etcdserver: no space")
 	ErrTooManyRequests            = errors.New("etcdserver: too many requests")