exabgp.configuration.static.mpls.prefix_sid() - Code Metrics - Exa-Networks/exabgp - Measure and Improve Code Quality continuously with Scrutinizer

exabgp.configuration.static.mpls.prefix_sid() F
last analyzed 2020-07-19 19:06 UTC

↳ Parent: exabgp.configuration.static.mpls

Complexity

Conditions

Size

Total Lines	53
Code Lines	47

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	20
eloc	47
nop	1
dl	0
loc	53
rs	0
c	0
b	0
f	0

How to fix Long Method Complexity

# encoding: utf-8
"""
inet/parser.py

Created by Thomas Mangin on 2015-06-04.
Copyright (c) 2009-2017 Exa Networks. All rights reserved.
License: 3-clause BSD. (See the COPYRIGHT file)
"""

from struct import pack

from exabgp.bgp.message.update.nlri.qualifier import Labels
from exabgp.bgp.message.update.nlri.qualifier import RouteDistinguisher
from exabgp.bgp.message.update.attribute.sr.prefixsid import PrefixSid
from exabgp.bgp.message.update.attribute.sr.labelindex import SrLabelIndex
from exabgp.bgp.message.update.attribute.sr.ipv6sid import SrV6Sid
from exabgp.bgp.message.update.attribute.sr.srv6vpnsid import Srv6VpnSid
from exabgp.bgp.message.update.attribute.sr.srv6l3vpnsid import Srv6L3vpnSid
from exabgp.bgp.message.update.attribute.sr.srgb import SrGb


def label(tokeniser):
    labels = []
    value = tokeniser()

    if value == '[':
        while True:
            value = tokeniser()
            if value == ']':
                break
            labels.append(int(value))
    else:
        labels.append(int(value))

    return Labels(labels)


def route_distinguisher(tokeniser):
    data = tokeniser()

    separator = data.find(':')
    if separator > 0:
        prefix = data[:separator]
        suffix = int(data[separator + 1 :])

    if '.' in prefix:

        data = [bytes([0, 1])]
        data.extend([bytes([int(_)]) for _ in prefix.split('.')])
        data.extend([bytes([suffix >> 8]), bytes([suffix & 0xFF])])

        rtd = b''.join(data)
    else:
        number = int(prefix)
        if number < pow(2, 16) and suffix < pow(2, 32):
            rtd = bytes([0, 0]) + pack('!H', number) + pack('!L', suffix)
        elif number < pow(2, 32) and suffix < pow(2, 16):
            rtd = bytes([0, 2]) + pack('!L', number) + pack('!H', suffix)
        else:
            raise ValueError('invalid route-distinguisher %s' % data)

    return RouteDistinguisher(rtd)


# [ 300, [ ( 800000,100 ), ( 1000000,5000 ) ] ]
def prefix_sid(tokeniser):
    sr_attrs = []
    srgbs = []
    srgb_data = []
    value = tokeniser()
    get_range = False
    consume_extra = False
    try:
        if value == '[':
            label_sid = tokeniser()
            while True:
                value = tokeniser()
                if value == '[':
                    consume_extra = True
                    continue
                if value == ',':
                    continue
                if value == '(':
                    while True:
                        value = tokeniser()
                        if value == ')':
                            break
                        if value == ',':
                            get_range = True
                            continue
                        if get_range:
                            srange = value
                            get_range = False
                        else:
                            base = value
                if value == ')':
                    srgb_data.append((base, srange))

                    continue
                if value == ']':
                    break
        if consume_extra:
            tokeniser()
    except Exception as e:
        raise ValueError('could not parse BGP PrefixSid attribute: {}'.format(e))

    if int(label_sid) < pow(2, 32):

        sr_attrs.append(SrLabelIndex(int(label_sid)))

    for srgb in srgb_data:
        if len(srgb) == 2 and int(srgb[0]) < pow(2, 24) and int(srgb[1]) < pow(2, 24):
            srgbs.append((int(srgb[0]), int(srgb[1])))
        else:
            raise ValueError('could not parse SRGB tupple')

    if srgbs:
        sr_attrs.append(SrGb(srgbs))

    return PrefixSid(sr_attrs)


# { ipv6 <ipv6-addr> | vpn <ipv6-addr> | l3vpn <ipv6-addr> }
def prefix_sid_srv6(tokeniser):
    sr_attrs = []
    value = tokeniser()
    try:
        if value == '(':
            value = tokeniser()
            if value == 'ipv6':
                value = tokeniser()
                sr_attrs.append(SrV6Sid(value))
                value = tokeniser()
                if value == ')':
                    return PrefixSid(sr_attrs)

            if value == 'vpn':
                value = tokeniser()
                sr_attrs.append(Srv6VpnSid(value))
                value = tokeniser()
                if value == ')':
                    return PrefixSid(sr_attrs)

            if value == 'l3vpn':
                value = tokeniser()
                sr_attrs.append(Srv6L3vpnSid(value))
                value = tokeniser()
                if value == ')':
                    return PrefixSid(sr_attrs)

        raise Exception("format error")
    except Exception as e:
        raise ValueError('could not parse BGP PrefixSid Srv6 attribute: {}'.format(e))


1		# encoding: utf-8
2		"""
3		inet/parser.py
4
5		Created by Thomas Mangin on 2015-06-04.
6		Copyright (c) 2009-2017 Exa Networks. All rights reserved.
7		License: 3-clause BSD. (See the COPYRIGHT file)
8		"""
9
10		from struct import pack
11
12		from exabgp.bgp.message.update.nlri.qualifier import Labels
13		from exabgp.bgp.message.update.nlri.qualifier import RouteDistinguisher
14		from exabgp.bgp.message.update.attribute.sr.prefixsid import PrefixSid
15		from exabgp.bgp.message.update.attribute.sr.labelindex import SrLabelIndex
16		from exabgp.bgp.message.update.attribute.sr.ipv6sid import SrV6Sid
17		from exabgp.bgp.message.update.attribute.sr.srv6vpnsid import Srv6VpnSid
18		from exabgp.bgp.message.update.attribute.sr.srv6l3vpnsid import Srv6L3vpnSid
19		from exabgp.bgp.message.update.attribute.sr.srgb import SrGb
20
21
22		def label(tokeniser):
23		labels = []
24		value = tokeniser()
25
26		if value == '[':
27		while True:
28		value = tokeniser()
29		if value == ']':
30		break
31		labels.append(int(value))
32		else:
33		labels.append(int(value))
34
35		return Labels(labels)
36
37
38		def route_distinguisher(tokeniser):
39		data = tokeniser()
40
41		separator = data.find(':')
42		if separator > 0:
43		prefix = data[:separator]
44		suffix = int(data[separator + 1 :])
45
46	View Code Duplication	if '.' in prefix:
		0 ignored issues – show introduced 2020-05-13 17:48 UTC by Report Bug Copy Issue Report The variable `prefix` does not seem to be defined in case `separator > 0` on line `42` is `False`. Are you sure this can never be the case? Loading history... Duplication introduced 2020-05-13 17:48 UTC by Report Bug Copy Issue Report This code seems to be duplicated in your project. Loading history...
47		data = [bytes([0, 1])]
48		data.extend([bytes([int(_)]) for _ in prefix.split('.')])
49		data.extend([bytes([suffix >> 8]), bytes([suffix & 0xFF])])
		0 ignored issues – show introduced 2020-05-13 17:48 UTC by Report Bug Copy Issue Report The variable `suffix` does not seem to be defined in case `separator > 0` on line `42` is `False`. Are you sure this can never be the case? Loading history...
50		rtd = b''.join(data)
51		else:
52		number = int(prefix)
53		if number < pow(2, 16) and suffix < pow(2, 32):
54		rtd = bytes([0, 0]) + pack('!H', number) + pack('!L', suffix)
55		elif number < pow(2, 32) and suffix < pow(2, 16):
56		rtd = bytes([0, 2]) + pack('!L', number) + pack('!H', suffix)
57		else:
58		raise ValueError('invalid route-distinguisher %s' % data)
59
60		return RouteDistinguisher(rtd)
61
62
63		# [ 300, [ ( 800000,100 ), ( 1000000,5000 ) ] ]
64		def prefix_sid(tokeniser):
65		sr_attrs = []
66		srgbs = []
67		srgb_data = []
68		value = tokeniser()
69		get_range = False
70		consume_extra = False
71		try:
72		if value == '[':
73		label_sid = tokeniser()
74		while True:
75		value = tokeniser()
76		if value == '[':
77		consume_extra = True
78		continue
79		if value == ',':
80		continue
81		if value == '(':
82		while True:
83		value = tokeniser()
84		if value == ')':
85		break
86		if value == ',':
87		get_range = True
88		continue
89		if get_range:
90		srange = value
91		get_range = False
92		else:
93		base = value
94		if value == ')':
95		srgb_data.append((base, srange))
		0 ignored issues – show introduced 2019-07-17 07:30 UTC by Report Bug Copy Issue Report The variable `base` does not seem to be defined for all execution paths. Loading history... introduced 2019-07-17 07:30 UTC by Report Bug Copy Issue Report The variable `srange` does not seem to be defined for all execution paths. Loading history...
96		continue
97		if value == ']':
98		break
99		if consume_extra:
100		tokeniser()
101		except Exception as e:
102		raise ValueError('could not parse BGP PrefixSid attribute: {}'.format(e))
103
104		if int(label_sid) < pow(2, 32):
		0 ignored issues – show introduced 2019-07-17 07:30 UTC by Report Bug Copy Issue Report The variable `label_sid` does not seem to be defined in case `value == '['` on line `72` is `False`. Are you sure this can never be the case? Loading history...
105		sr_attrs.append(SrLabelIndex(int(label_sid)))
106
107		for srgb in srgb_data:
108		if len(srgb) == 2 and int(srgb[0]) < pow(2, 24) and int(srgb[1]) < pow(2, 24):
109		srgbs.append((int(srgb[0]), int(srgb[1])))
110		else:
111		raise ValueError('could not parse SRGB tupple')
112
113		if srgbs:
114		sr_attrs.append(SrGb(srgbs))
115
116		return PrefixSid(sr_attrs)
117
118
119		# { ipv6 <ipv6-addr> \| vpn <ipv6-addr> \| l3vpn <ipv6-addr> }
120		def prefix_sid_srv6(tokeniser):
121		sr_attrs = []
122		value = tokeniser()
123		try:
124		if value == '(':
125		value = tokeniser()
126		if value == 'ipv6':
127		value = tokeniser()
128		sr_attrs.append(SrV6Sid(value))
129		value = tokeniser()
130		if value == ')':
131		return PrefixSid(sr_attrs)
132
133		if value == 'vpn':
134		value = tokeniser()
135		sr_attrs.append(Srv6VpnSid(value))
136		value = tokeniser()
137		if value == ')':
138		return PrefixSid(sr_attrs)
139
140		if value == 'l3vpn':
141		value = tokeniser()
142		sr_attrs.append(Srv6L3vpnSid(value))
143		value = tokeniser()
144		if value == ')':
145		return PrefixSid(sr_attrs)
146
147		raise Exception("format error")
148		except Exception as e:
149		raise ValueError('could not parse BGP PrefixSid Srv6 attribute: {}'.format(e))
150

Exa-Networks / exabgp

exabgp.configuration.static.mpls.prefix_sid() F last analyzed 2020-07-19 19:06 UTC

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exabgp.configuration.static.mpls.prefix_sid() F
last analyzed 2020-07-19 19:06 UTC