4 # Copyright (C) 2009 Google Inc.
6 # This program is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 2 of the License, or
9 # (at your option) any later version.
11 # This program is distributed in the hope that it will be useful, but
12 # WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with this program; if not, write to the Free Software
18 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
22 """Ganeti confd client/server library
26 from ganeti import constants
27 from ganeti import errors
33 def PackMagic(payload):
34 """Prepend the confd magic fourcc to a payload.
37 return ''.join([constants.CONFD_MAGIC_FOURCC, payload])
40 def UnpackMagic(payload):
41 """Unpack and check the confd magic fourcc from a payload.
44 if len(payload) < _FOURCC_LEN:
45 raise errors.ConfdMagicError("UDP payload too short to contain the"
48 magic_number = payload[:_FOURCC_LEN]
49 if magic_number != constants.CONFD_MAGIC_FOURCC:
50 raise errors.ConfdMagicError("UDP payload contains an unkown fourcc")
52 return payload[_FOURCC_LEN:]