Exa-Networks /
exabgp
| Total Complexity | 40 |
| Total Lines | 150 |
| Duplicated Lines | 8.67 % |
| Changes | 0 | ||
Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like exabgp.configuration.static.mpls often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
| 1 | # encoding: utf-8 |
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| 2 | """ |
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| 3 | inet/parser.py |
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| 4 | |||
| 5 | Created by Thomas Mangin on 2015-06-04. |
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| 6 | Copyright (c) 2009-2017 Exa Networks. All rights reserved. |
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| 7 | License: 3-clause BSD. (See the COPYRIGHT file) |
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| 8 | """ |
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| 9 | |||
| 10 | from struct import pack |
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| 11 | |||
| 12 | from exabgp.bgp.message.update.nlri.qualifier import Labels |
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| 13 | from exabgp.bgp.message.update.nlri.qualifier import RouteDistinguisher |
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| 14 | from exabgp.bgp.message.update.attribute.sr.prefixsid import PrefixSid |
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| 15 | from exabgp.bgp.message.update.attribute.sr.labelindex import SrLabelIndex |
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| 16 | from exabgp.bgp.message.update.attribute.sr.ipv6sid import SrV6Sid |
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| 17 | from exabgp.bgp.message.update.attribute.sr.srv6vpnsid import Srv6VpnSid |
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| 18 | from exabgp.bgp.message.update.attribute.sr.srv6l3vpnsid import Srv6L3vpnSid |
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| 19 | from exabgp.bgp.message.update.attribute.sr.srgb import SrGb |
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| 20 | |||
| 21 | |||
| 22 | def label(tokeniser): |
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| 23 | labels = [] |
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| 24 | value = tokeniser() |
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| 25 | |||
| 26 | if value == '[': |
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| 27 | while True: |
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| 28 | value = tokeniser() |
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| 29 | if value == ']': |
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| 30 | break |
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| 31 | labels.append(int(value)) |
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| 32 | else: |
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| 33 | labels.append(int(value)) |
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| 34 | |||
| 35 | return Labels(labels) |
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| 36 | |||
| 37 | |||
| 38 | def route_distinguisher(tokeniser): |
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| 39 | data = tokeniser() |
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| 40 | |||
| 41 | separator = data.find(':') |
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| 42 | if separator > 0: |
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| 43 | prefix = data[:separator] |
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| 44 | suffix = int(data[separator + 1 :]) |
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| 45 | |||
| 46 | View Code Duplication | if '.' in prefix: |
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| 47 | data = [bytes([0, 1])] |
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| 48 | data.extend([bytes([int(_)]) for _ in prefix.split('.')]) |
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| 49 | data.extend([bytes([suffix >> 8]), bytes([suffix & 0xFF])]) |
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| 50 | rtd = b''.join(data) |
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| 51 | else: |
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| 52 | number = int(prefix) |
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| 53 | if number < pow(2, 16) and suffix < pow(2, 32): |
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| 54 | rtd = bytes([0, 0]) + pack('!H', number) + pack('!L', suffix) |
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| 55 | elif number < pow(2, 32) and suffix < pow(2, 16): |
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| 56 | rtd = bytes([0, 2]) + pack('!L', number) + pack('!H', suffix) |
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| 57 | else: |
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| 58 | raise ValueError('invalid route-distinguisher %s' % data) |
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| 59 | |||
| 60 | return RouteDistinguisher(rtd) |
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| 61 | |||
| 62 | |||
| 63 | # [ 300, [ ( 800000,100 ), ( 1000000,5000 ) ] ] |
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| 64 | def prefix_sid(tokeniser): |
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| 65 | sr_attrs = [] |
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| 66 | srgbs = [] |
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| 67 | srgb_data = [] |
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| 68 | value = tokeniser() |
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| 69 | get_range = False |
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| 70 | consume_extra = False |
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| 71 | try: |
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| 72 | if value == '[': |
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| 73 | label_sid = tokeniser() |
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| 74 | while True: |
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| 75 | value = tokeniser() |
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| 76 | if value == '[': |
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| 77 | consume_extra = True |
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| 78 | continue |
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| 79 | if value == ',': |
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| 80 | continue |
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| 81 | if value == '(': |
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| 82 | while True: |
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| 83 | value = tokeniser() |
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| 84 | if value == ')': |
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| 85 | break |
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| 86 | if value == ',': |
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| 87 | get_range = True |
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| 88 | continue |
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| 89 | if get_range: |
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| 90 | srange = value |
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| 91 | get_range = False |
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| 92 | else: |
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| 93 | base = value |
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| 94 | if value == ')': |
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| 95 | srgb_data.append((base, srange)) |
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| 96 | continue |
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| 97 | if value == ']': |
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| 98 | break |
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| 99 | if consume_extra: |
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| 100 | tokeniser() |
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| 101 | except Exception as e: |
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| 102 | raise ValueError('could not parse BGP PrefixSid attribute: {}'.format(e)) |
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| 103 | |||
| 104 | if int(label_sid) < pow(2, 32): |
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| 105 | sr_attrs.append(SrLabelIndex(int(label_sid))) |
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| 106 | |||
| 107 | for srgb in srgb_data: |
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| 108 | if len(srgb) == 2 and int(srgb[0]) < pow(2, 24) and int(srgb[1]) < pow(2, 24): |
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| 109 | srgbs.append((int(srgb[0]), int(srgb[1]))) |
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| 110 | else: |
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| 111 | raise ValueError('could not parse SRGB tupple') |
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| 112 | |||
| 113 | if srgbs: |
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| 114 | sr_attrs.append(SrGb(srgbs)) |
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| 115 | |||
| 116 | return PrefixSid(sr_attrs) |
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| 117 | |||
| 118 | |||
| 119 | # { ipv6 <ipv6-addr> | vpn <ipv6-addr> | l3vpn <ipv6-addr> } |
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| 120 | def prefix_sid_srv6(tokeniser): |
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| 121 | sr_attrs = [] |
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| 122 | value = tokeniser() |
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| 123 | try: |
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| 124 | if value == '(': |
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| 125 | value = tokeniser() |
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| 126 | if value == 'ipv6': |
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| 127 | value = tokeniser() |
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| 128 | sr_attrs.append(SrV6Sid(value)) |
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| 129 | value = tokeniser() |
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| 130 | if value == ')': |
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| 131 | return PrefixSid(sr_attrs) |
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| 132 | |||
| 133 | if value == 'vpn': |
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| 134 | value = tokeniser() |
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| 135 | sr_attrs.append(Srv6VpnSid(value)) |
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| 136 | value = tokeniser() |
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| 137 | if value == ')': |
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| 138 | return PrefixSid(sr_attrs) |
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| 139 | |||
| 140 | if value == 'l3vpn': |
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| 141 | value = tokeniser() |
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| 142 | sr_attrs.append(Srv6L3vpnSid(value)) |
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| 143 | value = tokeniser() |
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| 144 | if value == ')': |
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| 145 | return PrefixSid(sr_attrs) |
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| 146 | |||
| 147 | raise Exception("format error") |
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| 148 | except Exception as e: |
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| 149 | raise ValueError('could not parse BGP PrefixSid Srv6 attribute: {}'.format(e)) |
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| 150 |
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