Exa-Networks / exabgp

lib/exabgp/bgp/message/update/attribute/bgpls/link/opaque.py

# encoding: utf-8
"""
opaque.py

Created by Evelio Vila on 2016-12-01.
Copyright (c) 2014-2017 Exa Networks. All rights reserved.
"""

from struct import pack
from struct import unpack

from exabgp.bgp.message.notification import Notify

from exabgp.bgp.message.update.attribute.bgpls.linkstate import LinkState

#
#     0                   1                   2                   3
#     0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
#    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#    |              Type             |             Length            |
#    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#    //                     Opaque link attributes (variable)       //
#    +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
#     https://tools.ietf.org/html/rfc7752#section-3.3.2.6 Opaque Link Attribute TLV
#
# This TLV is added here for completeness but we don't look into the TLV.


@LinkState.register()

This code seems to be duplicated in your project.

class LinkOpaque(object):
    TLV = 1097

    def __init__(self, opaque):
        self.opaque = opaque

    def __repr__(self):
        return "Link Opaque attribute: %s" % (self.opaque)

    @classmethod
    def unpack(cls, data, length):
        return cls(unpack("!%ds" % length, data[:length])[0])