exabgp.configuration.configuration.Configuration._rollback_reload() - Code Metrics - Exa-Networks/exabgp - Measure and Improve Code Quality continuously with Scrutinizer

Configuration._rollback_reload() A
last analyzed 2020-07-19 19:06 UTC

↳ Parent: exabgp.configuration.configuration

Complexity

Conditions

Size

Total Lines	5
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	5
nop	1
dl	0
loc	5
rs	10
c	0
b	0
f	0

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

Created by Thomas Mangin on 2009-08-25.
Copyright (c) 2009-2017 Exa Networks. All rights reserved.
License: 3-clause BSD. (See the COPYRIGHT file)
"""

import os
import sys

from exabgp.logger import log

from exabgp.configuration.core import Error
from exabgp.configuration.core import Scope
from exabgp.configuration.core import Tokeniser
from exabgp.configuration.core import Section

from exabgp.configuration.process import ParseProcess
from exabgp.configuration.template import ParseTemplate
from exabgp.configuration.template.neighbor import ParseTemplateNeighbor
from exabgp.configuration.neighbor import ParseNeighbor
from exabgp.configuration.neighbor.api import ParseAPI
from exabgp.configuration.neighbor.api import ParseSend
from exabgp.configuration.neighbor.api import ParseReceive
from exabgp.configuration.neighbor.family import ParseFamily
from exabgp.configuration.neighbor.family import ParseAddPath
from exabgp.configuration.neighbor.nexthop import ParseNextHop
from exabgp.configuration.capability import ParseCapability
from exabgp.configuration.announce import SectionAnnounce
from exabgp.configuration.announce import AnnounceIPv4
from exabgp.configuration.announce import AnnounceIPv6
from exabgp.configuration.announce import AnnounceL2VPN
from exabgp.configuration.static import ParseStatic
from exabgp.configuration.static import ParseStaticRoute
from exabgp.configuration.flow import ParseFlow
from exabgp.configuration.flow import ParseFlowRoute
from exabgp.configuration.flow import ParseFlowThen
from exabgp.configuration.flow import ParseFlowMatch
from exabgp.configuration.flow import ParseFlowScope
from exabgp.configuration.l2vpn import ParseL2VPN
from exabgp.configuration.l2vpn import ParseVPLS
from exabgp.configuration.operational import ParseOperational

from exabgp.environment import getenv

# for registration
from exabgp.configuration.announce.ip import AnnounceIP
from exabgp.configuration.announce.path import AnnouncePath
from exabgp.configuration.announce.label import AnnounceLabel
from exabgp.configuration.announce.vpn import AnnounceVPN
from exabgp.configuration.announce.flow import AnnounceFlow
from exabgp.configuration.announce.vpls import AnnounceVPLS


class _Configuration(object):
    def __init__(self):
        self.processes = {}
        self.neighbors = {}

    def inject_change(self, peers, change):
        result = True
        for neighbor in self.neighbors:
            if neighbor in peers:
                if change.nlri.family() in self.neighbors[neighbor].families():
                    self.neighbors[neighbor].rib.outgoing.add_to_rib(change)
                else:
                    log.error('the route family is not configured on neighbor', 'configuration')
                    result = False
        return result

    def inject_eor(self, peers, family):
        result = False
        for neighbor in self.neighbors:
            if neighbor in peers:
                result = True
                self.neighbors[neighbor].eor.append(family)
        return result

    def inject_operational(self, peers, operational):
        result = True
        for neighbor in self.neighbors:
            if neighbor in peers:
                if operational.family() in self.neighbors[neighbor].families():
                    if operational.name == 'ASM':
                        self.neighbors[neighbor].asm[operational.family()] = operational
                    self.neighbors[neighbor].messages.append(operational)
                else:
                    log.error('the route family is not configured on neighbor', 'configuration')
                    result = False
        return result

    def inject_refresh(self, peers, refreshes):
        result = True
        for neighbor in self.neighbors:
            if neighbor in peers:
                for refresh in refreshes:
                    family = (refresh.afi, refresh.safi)
                    if family in self.neighbors[neighbor].families():
                        self.neighbors[neighbor].refresh.append(refresh.__class__(refresh.afi, refresh.safi))
                    else:
                        result = False
        return result


class Configuration(_Configuration):
    def __init__(self, configurations, text=False):
        _Configuration.__init__(self)
        self.api_encoder = getenv().api.encoder

        self._configurations = configurations
        self._text = text

        self.error = Error()
        self.scope = Scope()

        self.tokeniser = Tokeniser(self.scope, self.error)

        params = (self.tokeniser, self.scope, self.error)
        self.section = Section(*params)
        self.process = ParseProcess(*params)
        self.template = ParseTemplate(*params)
        self.template_neighbor = ParseTemplateNeighbor(*params)
        self.neighbor = ParseNeighbor(*params)
        self.family = ParseFamily(*params)
        self.addpath = ParseAddPath(*params)
        self.nexthop = ParseNextHop(*params)
        self.capability = ParseCapability(*params)
        self.api = ParseAPI(*params)
        self.api_send = ParseSend(*params)
        self.api_receive = ParseReceive(*params)
        self.static = ParseStatic(*params)
        self.static_route = ParseStaticRoute(*params)
        self.announce = SectionAnnounce(*params)
        self.announce_ipv4 = AnnounceIPv4(*params)
        self.announce_ipv6 = AnnounceIPv6(*params)
        self.announce_l2vpn = AnnounceL2VPN(*params)
        self.flow = ParseFlow(*params)
        self.flow_route = ParseFlowRoute(*params)
        self.flow_match = ParseFlowMatch(*params)
        self.flow_then = ParseFlowThen(*params)
        self.flow_scope = ParseFlowScope(*params)
        self.l2vpn = ParseL2VPN(*params)
        self.vpls = ParseVPLS(*params)
        self.operational = ParseOperational(*params)

        # We should check if name are unique when running Section.__init__

        self._structure = {
            'root': {
                'class': self.section,
                'commands': [],
                'sections': {
                    'process': self.process.name,
                    'neighbor': self.neighbor.name,
                    'template': self.template.name,
                },
            },
            self.process.name: {'class': self.process, 'commands': self.process.known.keys(), 'sections': {},},
            self.template.name: {
                'class': self.template,
                'commands': self.template.known.keys(),
                'sections': {'neighbor': self.template_neighbor.name,},
            },
            self.template_neighbor.name: {
                'class': self.template_neighbor,
                'commands': self.template_neighbor.known.keys(),
                'sections': {
                    'family': self.family.name,
                    'capability': self.capability.name,
                    'add-path': self.addpath.name,
                    'nexthop': self.nexthop.name,
                    'api': self.api.name,
                    'static': self.static.name,
                    'flow': self.flow.name,
                    'l2vpn': self.l2vpn.name,
                    'operational': self.operational.name,
                    'announce': self.announce.name,
                },
            },
            self.neighbor.name: {
                'class': self.neighbor,
                'commands': self.neighbor.known.keys(),
                'sections': {
                    'family': self.family.name,
                    'capability': self.capability.name,
                    'add-path': self.addpath.name,
                    'nexthop': self.nexthop.name,
                    'api': self.api.name,
                    'static': self.static.name,
                    'flow': self.flow.name,
                    'l2vpn': self.l2vpn.name,
                    'operational': self.operational.name,
                    'announce': self.announce.name,
                },
            },
            self.family.name: {'class': self.family, 'commands': self.family.known.keys(), 'sections': {},},
            self.capability.name: {'class': self.capability, 'commands': self.capability.known.keys(), 'sections': {},},
            self.nexthop.name: {'class': self.nexthop, 'commands': self.nexthop.known.keys(), 'sections': {},},
            self.addpath.name: {'class': self.addpath, 'commands': self.addpath.known.keys(), 'sections': {},},
            self.api.name: {
                'class': self.api,
                'commands': self.api.known.keys(),
                'sections': {'send': self.api_send.name, 'receive': self.api_receive.name,},
            },
            self.api_send.name: {'class': self.api_send, 'commands': self.api_send.known.keys(), 'sections': {},},
            self.api_receive.name: {
                'class': self.api_receive,
                'commands': self.api_receive.known.keys(),
                'sections': {},
            },
            self.announce.name: {
                'class': self.announce,
                'commands': self.announce.known.keys(),
                'sections': {
                    'ipv4': self.announce_ipv4.name,
                    'ipv6': self.announce_ipv6.name,
                    'l2vpn': self.announce_l2vpn.name,
                },
            },
            self.announce_ipv4.name: {
                'class': self.announce_ipv4,
                'commands': ['unicast', 'multicast', 'nlri-mpls', 'mpls-vpn', 'flow', 'flow-vpn'],
                'sections': {},
            },
            self.announce_ipv6.name: {
                'class': self.announce_ipv6,
                'commands': ['unicast', 'multicast', 'nlri-mpls', 'mpls-vpn', 'flow', 'flow-vpn'],
                'sections': {},
            },
            self.announce_l2vpn.name: {'class': self.announce_l2vpn, 'commands': ['vpls',], 'sections': {},},
            self.static.name: {
                'class': self.static,
                'commands': ['route', 'attributes'],
                'sections': {'route': self.static_route.name,},
            },
            self.static_route.name: {
                'class': self.static_route,
                'commands': self.static_route.known.keys(),
                'sections': {},
            },
            self.flow.name: {
                'class': self.flow,
                'commands': self.flow.known.keys(),
                'sections': {'route': self.flow_route.name,},
            },
            self.flow_route.name: {
                'class': self.flow_route,
                'commands': self.flow_route.known.keys(),
                'sections': {
                    'match': self.flow_match.name,
                    'then': self.flow_then.name,
                    'scope': self.flow_scope.name,
                },
            },
            self.flow_match.name: {'class': self.flow_match, 'commands': self.flow_match.known.keys(), 'sections': {},},
            self.flow_then.name: {'class': self.flow_then, 'commands': self.flow_then.known.keys(), 'sections': {},},
            self.flow_scope.name: {'class': self.flow_scope, 'commands': self.flow_scope.known.keys(), 'sections': {}},
            self.l2vpn.name: {
                'class': self.l2vpn,
                'commands': self.l2vpn.known.keys(),
                'sections': {'vpls': self.vpls.name,},
            },
            self.vpls.name: {'class': self.vpls, 'commands': self.l2vpn.known.keys(), 'sections': {},},
            self.operational.name: {
                'class': self.operational,
                'commands': self.operational.known.keys(),
                'sections': {},
            },
        }

        self._neighbors = {}
        self._previous_neighbors = {}

    def _clear(self):
        self.processes = {}
        self._previous_neighbors = self.neighbors
        self.neighbors = {}
        self._neighbors = {}

    # clear the parser data (ie: free memory)
    def _cleanup(self):
        self.error.clear()
        self.tokeniser.clear()
        self.scope.clear()

        self.process.clear()
        self.template.clear()
        self.template_neighbor.clear()
        self.neighbor.clear()
        self.family.clear()
        self.capability.clear()
        self.api.clear()
        self.api_send.clear()
        self.api_receive.clear()
        self.announce_ipv6.clear()
        self.announce_ipv4.clear()
        self.announce_l2vpn.clear()
        self.announce.clear()
        self.static.clear()
        self.static_route.clear()
        self.flow.clear()
        self.flow_route.clear()
        self.flow_match.clear()
        self.flow_then.clear()
        self.flow_scope.clear()
        self.l2vpn.clear()
        self.vpls.clear()
        self.operational.clear()

    def _rollback_reload(self):
        self.neighbors = self._previous_neighbors
        self.processes = self.process.processes
        self._neighbors = {}
        self._previous_neighbors = {}

    def _commit_reload(self):
        self.neighbors = self.neighbor.neighbors
        # XXX: Yes, we do not detect changes in processes and restart anything ..
        # XXX: This is a bug ..
        self.processes = self.process.processes
        self._neighbors = {}

        # Add the changes prior to the reload to the neighbor to correct handling of deleted routes
        for neighbor in self.neighbors:
            if neighbor in self._previous_neighbors:
                self.neighbors[neighbor].backup_changes = self._previous_neighbors[neighbor].changes

        self._previous_neighbors = {}
        self._cleanup()

    def reload(self):
        try:
            return self._reload()
        except KeyboardInterrupt:
            return self.error.set('configuration reload aborted by ^C or SIGINT')
        except Error as exc:
            if getenv().debug.configuration:
                raise
            return self.error.set(
                'problem parsing configuration file line %d\n' 'error message: %s' % (self.tokeniser.index_line, exc)
            )
        except Exception as exc:
            if getenv().debug.configuration:
                raise
            return self.error.set(
                'problem parsing configuration file line %d\n' 'error message: %s' % (self.tokeniser.index_line, exc)
            )

    def _reload(self):
        # taking the first configuration available (FIFO buffer)
        fname = self._configurations.pop(0)
        self._configurations.append(fname)

        # clearing the current configuration to be able to re-parse it
        self._clear()

        if self._text:
            if not self.tokeniser.set_text(fname):
                return False
        else:
            # resolve any potential symlink, and check it is a file
            target = os.path.realpath(fname)
            if not os.path.isfile(target):
                return False
            if not self.tokeniser.set_file(target):
                return False

        if self.parseSection('root') is not True:
            # XXX: Should it be in neighbor ?
            self.process.add_api()
            self._rollback_reload()

            return self.error.set(
                "\n"
                "syntax error in section %s\n"
                "line %d: %s\n"
                "\n%s" % (self.scope.location(), self.tokeniser.number, ' '.join(self.tokeniser.line), str(self.error))
            )

        self.process.add_api()
        self._commit_reload()
        self._link()

        check = self.validate()
        if check is not None:
            return check

        return True

    def validate(self):
        for neighbor in self.neighbors.values():
            for notification in neighbor.api:
                for api in neighbor.api[notification]:
                    if not self.processes[api].get('run', ''):
                        return self.error.set(
                            "\n\nan api called '%s' is used by neighbor '%s' but not defined\n\n"
                            % (api, neighbor.peer_address),
                        )
        return None

    def _link(self):
        for neighbor in self.neighbors.values():
            api = neighbor.api
            for process in api.get('processes', []):
                self.processes.setdefault(process, {})['neighbor-changes'] = api['neighbor-changes']
                self.processes.setdefault(process, {})['negotiated'] = api['negotiated']
                self.processes.setdefault(process, {})['fsm'] = api['fsm']
                self.processes.setdefault(process, {})['signal'] = api['signal']
                for way in ('send', 'receive'):
                    for name in ('parsed', 'packets', 'consolidate'):
                        key = "%s-%s" % (way, name)
                        if api[key]:
                            self.processes[process].setdefault(key, []).append(neighbor.router_id)
                    for name in ('open', 'update', 'notification', 'keepalive', 'refresh', 'operational'):
                        key = "%s-%s" % (way, name)
                        if api[key]:
                            self.processes[process].setdefault(key, []).append(neighbor.router_id)

    def partial(self, section, text, action='announce'):
        self._cleanup()  # this perform a big cleanup (may be able to be smarter)
        self._clear()
        self.tokeniser.set_api(text if text.endswith(';') or text.endswith('}') else text + ' ;')
        self.tokeniser.set_action(action)

        if self.parseSection(section) is not True:
            self._rollback_reload()
            log.debug(
                "\n"
                "syntax error in api command %s\n"
                "line %d: %s\n"
                "\n%s" % (self.scope.location(), self.tokeniser.number, ' '.join(self.tokeniser.line), str(self.error)),
                'configuration',
            )
            return False
        return True

    def _enter(self, name):
        location = self.tokeniser.iterate()
        log.debug("> %-16s | %s" % (location, self.tokeniser.params()), 'configuration')

        if location not in self._structure[name]['sections']:
            return self.error.set('section %s is invalid in %s, %s' % (location, name, self.scope.location()))

        self.scope.enter(location)
        self.scope.to_context()

        class_name = self._structure[name]['sections'][location]
        instance = self._structure[class_name].get('class', None)
        if not instance:
            raise RuntimeError('This should not be happening, debug time !')

        if not instance.pre():
            return False

        if not self.dispatch(self._structure[name]['sections'][location]):
            return False

        if not instance.post():
            return False

        left = self.scope.leave()
        if not left:
            return self.error.set('closing too many parenthesis')
        self.scope.to_context()

        log.debug("< %-16s | %s" % (left, self.tokeniser.params()), 'configuration')
        return True

    def _run(self, name):
        command = self.tokeniser.iterate()
        log.debug(". %-16s | %s" % (command, self.tokeniser.params()), 'configuration')

        if not self.run(name, command):
            return False
        return True

    def dispatch(self, name):
        while True:
            self.tokeniser()

            if self.tokeniser.end == ';':
                if self._run(name):
                    continue
                return False

            if self.tokeniser.end == '{':
                if self._enter(name):
                    continue
                return False

            if self.tokeniser.end == '}':
                return True

            if not self.tokeniser.end:  # finished
                return True

            return self.error.set('invalid syntax line %d' % self.tokeniser.index_line)
        return False

    def parseSection(self, name):
        if name not in self._structure:
            return self.error.set('option %s is not allowed here' % name)

        return self.dispatch(name)

    def run(self, name, command):
        # restore 'anounce attribute' to provide backward 3.4 compatibility
        if name == 'static' and command == 'attribute':
            command = 'attributes'
        if command not in self._structure[name]['commands']:
            return self.error.set('invalid keyword "%s"' % command)

        return self._structure[name]['class'].parse(name, command)


1			# encoding: utf-8
2			"""
3			configuration.py
4
5			Created by Thomas Mangin on 2009-08-25.
6			Copyright (c) 2009-2017 Exa Networks. All rights reserved.
7			License: 3-clause BSD. (See the COPYRIGHT file)
8			"""
9
10			import os
11			import sys
12
13			from exabgp.logger import log
14
15			from exabgp.configuration.core import Error
16			from exabgp.configuration.core import Scope
17			from exabgp.configuration.core import Tokeniser
18			from exabgp.configuration.core import Section
19
20			from exabgp.configuration.process import ParseProcess
21			from exabgp.configuration.template import ParseTemplate
22			from exabgp.configuration.template.neighbor import ParseTemplateNeighbor
23			from exabgp.configuration.neighbor import ParseNeighbor
24			from exabgp.configuration.neighbor.api import ParseAPI
25			from exabgp.configuration.neighbor.api import ParseSend
26			from exabgp.configuration.neighbor.api import ParseReceive
27			from exabgp.configuration.neighbor.family import ParseFamily
28			from exabgp.configuration.neighbor.family import ParseAddPath
29			from exabgp.configuration.neighbor.nexthop import ParseNextHop
30			from exabgp.configuration.capability import ParseCapability
31			from exabgp.configuration.announce import SectionAnnounce
32			from exabgp.configuration.announce import AnnounceIPv4
33			from exabgp.configuration.announce import AnnounceIPv6
34			from exabgp.configuration.announce import AnnounceL2VPN
35			from exabgp.configuration.static import ParseStatic
36			from exabgp.configuration.static import ParseStaticRoute
37			from exabgp.configuration.flow import ParseFlow
38			from exabgp.configuration.flow import ParseFlowRoute
39			from exabgp.configuration.flow import ParseFlowThen
40			from exabgp.configuration.flow import ParseFlowMatch
41			from exabgp.configuration.flow import ParseFlowScope
42			from exabgp.configuration.l2vpn import ParseL2VPN
43			from exabgp.configuration.l2vpn import ParseVPLS
44			from exabgp.configuration.operational import ParseOperational
45
46			from exabgp.environment import getenv
47
48			# for registration
49			from exabgp.configuration.announce.ip import AnnounceIP
50			from exabgp.configuration.announce.path import AnnouncePath
51			from exabgp.configuration.announce.label import AnnounceLabel
52			from exabgp.configuration.announce.vpn import AnnounceVPN
53			from exabgp.configuration.announce.flow import AnnounceFlow
54			from exabgp.configuration.announce.vpls import AnnounceVPLS
55
56
57			class _Configuration(object):
58			def __init__(self):
59			self.processes = {}
60			self.neighbors = {}
61
62			def inject_change(self, peers, change):
63			result = True
64			for neighbor in self.neighbors:
65			if neighbor in peers:
66			if change.nlri.family() in self.neighbors[neighbor].families():
67			self.neighbors[neighbor].rib.outgoing.add_to_rib(change)
68			else:
69			log.error('the route family is not configured on neighbor', 'configuration')
70			result = False
71			return result
72
73			def inject_eor(self, peers, family):
74			result = False
75			for neighbor in self.neighbors:
76			if neighbor in peers:
77			result = True
78			self.neighbors[neighbor].eor.append(family)
79			return result
80
81			def inject_operational(self, peers, operational):
82			result = True
83			for neighbor in self.neighbors:
84			if neighbor in peers:
85			if operational.family() in self.neighbors[neighbor].families():
86			if operational.name == 'ASM':
87			self.neighbors[neighbor].asm[operational.family()] = operational
88			self.neighbors[neighbor].messages.append(operational)
89			else:
90			log.error('the route family is not configured on neighbor', 'configuration')
91			result = False
92			return result
93
94			def inject_refresh(self, peers, refreshes):
95			result = True
96			for neighbor in self.neighbors:
97			if neighbor in peers:
98			for refresh in refreshes:
99			family = (refresh.afi, refresh.safi)
100			if family in self.neighbors[neighbor].families():
101			self.neighbors[neighbor].refresh.append(refresh.__class__(refresh.afi, refresh.safi))
102			else:
103			result = False
104			return result
105
106
107			class Configuration(_Configuration):
108			def __init__(self, configurations, text=False):
109			_Configuration.__init__(self)
110			self.api_encoder = getenv().api.encoder
111
112			self._configurations = configurations
113			self._text = text
114
115			self.error = Error()
116			self.scope = Scope()
117
118			self.tokeniser = Tokeniser(self.scope, self.error)
119
120			params = (self.tokeniser, self.scope, self.error)
121			self.section = Section(*params)
122			self.process = ParseProcess(*params)
123			self.template = ParseTemplate(*params)
124			self.template_neighbor = ParseTemplateNeighbor(*params)
125			self.neighbor = ParseNeighbor(*params)
126			self.family = ParseFamily(*params)
127			self.addpath = ParseAddPath(*params)
128			self.nexthop = ParseNextHop(*params)
129			self.capability = ParseCapability(*params)
130			self.api = ParseAPI(*params)
131			self.api_send = ParseSend(*params)
132			self.api_receive = ParseReceive(*params)
133			self.static = ParseStatic(*params)
134			self.static_route = ParseStaticRoute(*params)
135			self.announce = SectionAnnounce(*params)
136			self.announce_ipv4 = AnnounceIPv4(*params)
137			self.announce_ipv6 = AnnounceIPv6(*params)
138			self.announce_l2vpn = AnnounceL2VPN(*params)
139			self.flow = ParseFlow(*params)
140			self.flow_route = ParseFlowRoute(*params)
141			self.flow_match = ParseFlowMatch(*params)
142			self.flow_then = ParseFlowThen(*params)
143			self.flow_scope = ParseFlowScope(*params)
144			self.l2vpn = ParseL2VPN(*params)
145			self.vpls = ParseVPLS(*params)
146			self.operational = ParseOperational(*params)
147
148			# We should check if name are unique when running Section.__init__
149
150			self._structure = {
151			'root': {
152			'class': self.section,
153			'commands': [],
154			'sections': {
155			'process': self.process.name,
156			'neighbor': self.neighbor.name,
157			'template': self.template.name,
158			},
159			},
160			self.process.name: {'class': self.process, 'commands': self.process.known.keys(), 'sections': {},},
161			self.template.name: {
162			'class': self.template,
163			'commands': self.template.known.keys(),
164			'sections': {'neighbor': self.template_neighbor.name,},
165			},
166			self.template_neighbor.name: {
167			'class': self.template_neighbor,
168			'commands': self.template_neighbor.known.keys(),
169			'sections': {
170			'family': self.family.name,
171			'capability': self.capability.name,
172			'add-path': self.addpath.name,
173			'nexthop': self.nexthop.name,
174			'api': self.api.name,
175			'static': self.static.name,
176			'flow': self.flow.name,
177			'l2vpn': self.l2vpn.name,
178			'operational': self.operational.name,
179			'announce': self.announce.name,
180			},
181			},
182			self.neighbor.name: {
183			'class': self.neighbor,
184			'commands': self.neighbor.known.keys(),
185			'sections': {
186			'family': self.family.name,
187			'capability': self.capability.name,
188			'add-path': self.addpath.name,
189			'nexthop': self.nexthop.name,
190			'api': self.api.name,
191			'static': self.static.name,
192			'flow': self.flow.name,
193			'l2vpn': self.l2vpn.name,
194			'operational': self.operational.name,
195			'announce': self.announce.name,
196			},
197			},
198			self.family.name: {'class': self.family, 'commands': self.family.known.keys(), 'sections': {},},
199			self.capability.name: {'class': self.capability, 'commands': self.capability.known.keys(), 'sections': {},},
200			self.nexthop.name: {'class': self.nexthop, 'commands': self.nexthop.known.keys(), 'sections': {},},
201			self.addpath.name: {'class': self.addpath, 'commands': self.addpath.known.keys(), 'sections': {},},
202			self.api.name: {
203			'class': self.api,
204			'commands': self.api.known.keys(),
205			'sections': {'send': self.api_send.name, 'receive': self.api_receive.name,},
206			},
207			self.api_send.name: {'class': self.api_send, 'commands': self.api_send.known.keys(), 'sections': {},},
208			self.api_receive.name: {
209			'class': self.api_receive,
210			'commands': self.api_receive.known.keys(),
211			'sections': {},
212			},
213			self.announce.name: {
214			'class': self.announce,
215			'commands': self.announce.known.keys(),
216			'sections': {
217			'ipv4': self.announce_ipv4.name,
218			'ipv6': self.announce_ipv6.name,
219			'l2vpn': self.announce_l2vpn.name,
220			},
221			},
222			self.announce_ipv4.name: {
223			'class': self.announce_ipv4,
224			'commands': ['unicast', 'multicast', 'nlri-mpls', 'mpls-vpn', 'flow', 'flow-vpn'],
225			'sections': {},
226			},
227			self.announce_ipv6.name: {
228			'class': self.announce_ipv6,
229			'commands': ['unicast', 'multicast', 'nlri-mpls', 'mpls-vpn', 'flow', 'flow-vpn'],
230			'sections': {},
231			},
232			self.announce_l2vpn.name: {'class': self.announce_l2vpn, 'commands': ['vpls',], 'sections': {},},
233			self.static.name: {
234			'class': self.static,
235			'commands': ['route', 'attributes'],
236			'sections': {'route': self.static_route.name,},
237			},
238			self.static_route.name: {
239			'class': self.static_route,
240			'commands': self.static_route.known.keys(),
241			'sections': {},
242			},
243			self.flow.name: {
244			'class': self.flow,
245			'commands': self.flow.known.keys(),
246			'sections': {'route': self.flow_route.name,},
247			},
248			self.flow_route.name: {
249			'class': self.flow_route,
250			'commands': self.flow_route.known.keys(),
251			'sections': {
252			'match': self.flow_match.name,
253			'then': self.flow_then.name,
254			'scope': self.flow_scope.name,
255			},
256			},
257			self.flow_match.name: {'class': self.flow_match, 'commands': self.flow_match.known.keys(), 'sections': {},},
258			self.flow_then.name: {'class': self.flow_then, 'commands': self.flow_then.known.keys(), 'sections': {},},
259			self.flow_scope.name: {'class': self.flow_scope, 'commands': self.flow_scope.known.keys(), 'sections': {}},
260			self.l2vpn.name: {
261			'class': self.l2vpn,
262			'commands': self.l2vpn.known.keys(),
263			'sections': {'vpls': self.vpls.name,},
264			},
265			self.vpls.name: {'class': self.vpls, 'commands': self.l2vpn.known.keys(), 'sections': {},},
266			self.operational.name: {
267			'class': self.operational,
268			'commands': self.operational.known.keys(),
269			'sections': {},
270			},
271			}
272
273			self._neighbors = {}
274			self._previous_neighbors = {}
275
276			def _clear(self):
277			self.processes = {}
278			self._previous_neighbors = self.neighbors
279			self.neighbors = {}
280			self._neighbors = {}
281
282			# clear the parser data (ie: free memory)
283			def _cleanup(self):
284			self.error.clear()
285			self.tokeniser.clear()
286			self.scope.clear()
287
288			self.process.clear()
289			self.template.clear()
290			self.template_neighbor.clear()
291			self.neighbor.clear()
292			self.family.clear()
293			self.capability.clear()
294			self.api.clear()
295			self.api_send.clear()
296			self.api_receive.clear()
297			self.announce_ipv6.clear()
298			self.announce_ipv4.clear()
299			self.announce_l2vpn.clear()
300			self.announce.clear()
301			self.static.clear()
302			self.static_route.clear()
303			self.flow.clear()
304			self.flow_route.clear()
305			self.flow_match.clear()
306			self.flow_then.clear()
307			self.flow_scope.clear()
308			self.l2vpn.clear()
309			self.vpls.clear()
310			self.operational.clear()
311
312			def _rollback_reload(self):
313			self.neighbors = self._previous_neighbors
314			self.processes = self.process.processes
315			self._neighbors = {}
316			self._previous_neighbors = {}
317
318			def _commit_reload(self):
319			self.neighbors = self.neighbor.neighbors
320			# XXX: Yes, we do not detect changes in processes and restart anything ..
321			# XXX: This is a bug ..
322			self.processes = self.process.processes
323			self._neighbors = {}
324
325			# Add the changes prior to the reload to the neighbor to correct handling of deleted routes
326			for neighbor in self.neighbors:
327			if neighbor in self._previous_neighbors:
328			self.neighbors[neighbor].backup_changes = self._previous_neighbors[neighbor].changes
329
330			self._previous_neighbors = {}
331			self._cleanup()
332
333			def reload(self):
334			try:
335			return self._reload()
336			except KeyboardInterrupt:
337			return self.error.set('configuration reload aborted by ^C or SIGINT')
338			except Error as exc:
339			if getenv().debug.configuration:
340			raise
341			return self.error.set(
342			'problem parsing configuration file line %d\n' 'error message: %s' % (self.tokeniser.index_line, exc)
343			)
344			except Exception as exc:
345			if getenv().debug.configuration:
346			raise
347			return self.error.set(
348			'problem parsing configuration file line %d\n' 'error message: %s' % (self.tokeniser.index_line, exc)
349			)
350
351			def _reload(self):
352			# taking the first configuration available (FIFO buffer)
353			fname = self._configurations.pop(0)
354			self._configurations.append(fname)
355
356			# clearing the current configuration to be able to re-parse it
357			self._clear()
358
359			if self._text:
360			if not self.tokeniser.set_text(fname):
361			return False
362			else:
363			# resolve any potential symlink, and check it is a file
364			target = os.path.realpath(fname)
365			if not os.path.isfile(target):
366			return False
367			if not self.tokeniser.set_file(target):
368			return False
369
370			if self.parseSection('root') is not True:
371			# XXX: Should it be in neighbor ?
372			self.process.add_api()
373			self._rollback_reload()
374
375			return self.error.set(
376			"\n"
377			"syntax error in section %s\n"
378			"line %d: %s\n"
379			"\n%s" % (self.scope.location(), self.tokeniser.number, ' '.join(self.tokeniser.line), str(self.error))
380			)
381
382			self.process.add_api()
383			self._commit_reload()
384			self._link()
385
386			check = self.validate()
387			if check is not None:
388			return check
389
390			return True
391
392			def validate(self):
393			for neighbor in self.neighbors.values():
394			for notification in neighbor.api:
395			for api in neighbor.api[notification]:
396			if not self.processes[api].get('run', ''):
397			return self.error.set(
398			"\n\nan api called '%s' is used by neighbor '%s' but not defined\n\n"
399			% (api, neighbor.peer_address),
400			)
401			return None
402
403			def _link(self):
404			for neighbor in self.neighbors.values():
405			api = neighbor.api
406			for process in api.get('processes', []):
407			self.processes.setdefault(process, {})['neighbor-changes'] = api['neighbor-changes']
408			self.processes.setdefault(process, {})['negotiated'] = api['negotiated']
409			self.processes.setdefault(process, {})['fsm'] = api['fsm']
410			self.processes.setdefault(process, {})['signal'] = api['signal']
411			for way in ('send', 'receive'):
412			for name in ('parsed', 'packets', 'consolidate'):
413			key = "%s-%s" % (way, name)
414			if api[key]:
415			self.processes[process].setdefault(key, []).append(neighbor.router_id)
416			for name in ('open', 'update', 'notification', 'keepalive', 'refresh', 'operational'):
417			key = "%s-%s" % (way, name)
418			if api[key]:
419			self.processes[process].setdefault(key, []).append(neighbor.router_id)
420
421			def partial(self, section, text, action='announce'):
422			self._cleanup() # this perform a big cleanup (may be able to be smarter)
423			self._clear()
424			self.tokeniser.set_api(text if text.endswith(';') or text.endswith('}') else text + ' ;')
425			self.tokeniser.set_action(action)
426
427			if self.parseSection(section) is not True:
428			self._rollback_reload()
429			log.debug(
430			"\n"
431			"syntax error in api command %s\n"
432			"line %d: %s\n"
433			"\n%s" % (self.scope.location(), self.tokeniser.number, ' '.join(self.tokeniser.line), str(self.error)),
434			'configuration',
435			)
436			return False
437			return True
438
439			def _enter(self, name):
440			location = self.tokeniser.iterate()
441			log.debug("> %-16s \| %s" % (location, self.tokeniser.params()), 'configuration')
442
443			if location not in self._structure[name]['sections']:
444			return self.error.set('section %s is invalid in %s, %s' % (location, name, self.scope.location()))
445
446			self.scope.enter(location)
447			self.scope.to_context()
448
449			class_name = self._structure[name]['sections'][location]
450			instance = self._structure[class_name].get('class', None)
451			if not instance:
452			raise RuntimeError('This should not be happening, debug time !')
453
454			if not instance.pre():
455			return False
456
457			if not self.dispatch(self._structure[name]['sections'][location]):
458			return False
459
460			if not instance.post():
461			return False
462
463			left = self.scope.leave()
464			if not left:
465			return self.error.set('closing too many parenthesis')
466			self.scope.to_context()
467
468			log.debug("< %-16s \| %s" % (left, self.tokeniser.params()), 'configuration')
469			return True
470
471			def _run(self, name):
472			command = self.tokeniser.iterate()
473			log.debug(". %-16s \| %s" % (command, self.tokeniser.params()), 'configuration')
474
475			if not self.run(name, command):
476			return False
477			return True
478
479			def dispatch(self, name):
480			while True:
481			self.tokeniser()
482
483			if self.tokeniser.end == ';':
484			if self._run(name):
485			continue
486			return False
487
488			if self.tokeniser.end == '{':
489			if self._enter(name):
490			continue
491			return False
492
493			if self.tokeniser.end == '}':
494			return True
495
496			if not self.tokeniser.end: # finished
497			return True
498
499			return self.error.set('invalid syntax line %d' % self.tokeniser.index_line)
500			return False
501
502			def parseSection(self, name):
503			if name not in self._structure:
504			return self.error.set('option %s is not allowed here' % name)
505
506			return self.dispatch(name)
507
508			def run(self, name, command):
509			# restore 'anounce attribute' to provide backward 3.4 compatibility
510			if name == 'static' and command == 'attribute':
511			command = 'attributes'
512			if command not in self._structure[name]['commands']:
513			return self.error.set('invalid keyword "%s"' % command)
514
515			return self._structure[name]['class'].parse(name, command)
516

Exa-Networks / exabgp

Configuration._rollback_reload() A last analyzed 2020-07-19 19:06 UTC

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Configuration._rollback_reload() A
last analyzed 2020-07-19 19:06 UTC