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# Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
# Copyright (C) 2011 Isaku Yamahata <yamahata at valinux co jp>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
import struct
from ryu import exception
from . import ofproto
LOG = logging.getLogger('ryu.ofproto.ofproto_parser')
def header(buf):
assert len(buf) >= ofproto.OFP_HEADER_SIZE
#LOG.debug('len %d bufsize %d', len(buf), ofproto.OFP_HEADER_SIZE)
return struct.unpack_from(ofproto.OFP_HEADER_PACK_STR, buffer(buf))
_MSG_PARSERS = {}
def register_msg_parser(version):
def register(msg_parser):
_MSG_PARSERS[version] = msg_parser
return msg_parser
return register
def msg(datapath, version, msg_type, msg_len, xid, buf):
assert len(buf) >= msg_len
msg_parser = _MSG_PARSERS.get(version)
if msg_parser is None:
raise exception.OFPUnknownVersion(version=version)
return msg_parser(datapath, version, msg_type, msg_len, xid, buf)
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