Revision 9748ab35
| b/daemons/ganeti-confd | ||
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| 43 | 43 |
from ganeti import ssconf |
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from ganeti.asyncnotifier import AsyncNotifier |
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from ganeti.confd.server import ConfdProcessor |
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from ganeti.confd import PackMagic, UnpackMagic |
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class ConfdAsyncUDPServer(daemon.AsyncUDPSocket): |
| ... | ... | |
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# this method is overriding a daemon.AsyncUDPSocket method |
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def handle_datagram(self, payload_in, ip, port): |
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if len(payload_in) < len(constants.CONFD_MAGIC_FOURCC): |
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logging.debug("Received a query which is too short to be true")
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return |
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magic_number = payload_in[:4] |
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query = payload_in[4:] |
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if magic_number != constants.CONFD_MAGIC_FOURCC: |
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logging.debug("Received a query with an unknown magic number")
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try: |
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query = UnpackMagic(payload_in) |
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except errors.ConfdMagicError, err: |
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logging.debug(err) |
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return |
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answer = self.processor.ExecQuery(query, ip, port) |
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if answer is not None: |
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payload_out = ''.join([constants.CONFD_MAGIC_FOURCC, answer]) |
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try: |
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self.enqueue_send(ip, port, payload_out)
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self.enqueue_send(ip, port, PackMagic(answer))
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except errors.UdpDataSizeError: |
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logging.error("Reply too big to fit in an udp packet.")
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| b/lib/confd/__init__.py | ||
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# 02110-1301, USA. |
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"""Ganeti confd library |
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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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_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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| b/lib/errors.py | ||
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| 297 | 297 |
""" |
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class ConfdMagicError(GenericError): |
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"""A magic fourcc error in Ganeti confd. |
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Errors processing the fourcc in ganeti confd datagrams. |
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""" |
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class UdpDataSizeError(GenericError): |
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"""UDP payload too big. |
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