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#
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#
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# Copyright (C) 2009 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Ganeti confd client/server library
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"""
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from ganeti import constants
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from ganeti import errors
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_FOURCC_LEN = 4
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def PackMagic(payload):
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  """Prepend the confd magic fourcc to a payload.
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  """
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  return ''.join([constants.CONFD_MAGIC_FOURCC, payload])
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def UnpackMagic(payload):
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  """Unpack and check the confd magic fourcc from a payload.
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  """
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  if len(payload) < _FOURCC_LEN:
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    raise errors.ConfdMagicError("UDP payload too short to contain the"
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                                 " fourcc code")
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  magic_number = payload[:_FOURCC_LEN]
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  if magic_number != constants.CONFD_MAGIC_FOURCC:
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    raise errors.ConfdMagicError("UDP payload contains an unkown fourcc")
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  return payload[_FOURCC_LEN:]
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