Add multi-user service for no-2022 aead

shadowsocks.go

@@ -14,6 +14,7 @@ import (
 var (
 	ErrBadKey          = E.New("bad key")
 	ErrMissingPassword = E.New("missing password")
+	ErrNoUsers         = E.New("no users")
 )
 
 type Method interface {
@@ -31,6 +32,15 @@ type Service interface {
 	E.Handler
 }
 
+type MultiService[U comparable] interface {
+	Name() string
+	UpdateUsers(userList []U, keyList [][]byte) error
+	UpdateUsersWithPasswords(userList []U, passwordList []string) error
+	N.TCPConnectionHandler
+	N.UDPHandler
+	E.Handler
+}
+
 type Handler interface {
 	N.TCPConnectionHandler
 	N.UDPConnectionHandler