4 # Copyright (C) 2009, 2012 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
34 #: Items in the individual rows of the NodeDrbd query
35 _HTNodeDrbdItems = [ht.TString, ht.TInt, ht.TString,
36 ht.TString, ht.TString, ht.TString]
37 #: Type for the (top-level) result of NodeDrbd query
38 HTNodeDrbd = ht.TListOf(ht.TAnd(ht.TList, ht.TIsLength(len(_HTNodeDrbdItems)),
39 ht.TItems(_HTNodeDrbdItems)))
42 def PackMagic(payload):
43 """Prepend the confd magic fourcc to a payload.
46 return "".join([constants.CONFD_MAGIC_FOURCC, payload])
49 def UnpackMagic(payload):
50 """Unpack and check the confd magic fourcc from a payload.
53 if len(payload) < _FOURCC_LEN:
54 raise errors.ConfdMagicError("UDP payload too short to contain the"
57 magic_number = payload[:_FOURCC_LEN]
58 if magic_number != constants.CONFD_MAGIC_FOURCC:
59 raise errors.ConfdMagicError("UDP payload contains an unkown fourcc")
61 return payload[_FOURCC_LEN:]