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#!/usr/bin/env python3
import json
import logging
import sys
from flask import Blueprint
import flask
from yabgp.agent import prepare_service
from yabgp.common import constants
from yabgp.handler import BaseHandler
from yabgp.api import app
from yabgp.api import utils as api_utils
from yabgp.api.v1 import auth
LOG = logging.getLogger(__name__)
blueprint = Blueprint('v1-ext', __name__)
_send_update = api_utils.send_update
def _extract_afi_safi(attr):
# MP_REACH_NLRI(14) or MP_UNREACH_NLRI(15)
nlri = attr.get(14, None) or attr.get(15, None)
if nlri and 'afi_safi' in nlri:
afi_safi = nlri.get('afi_safi', None)
return constants.AFI_SAFI_DICT.get(tuple(afi_safi), None)
return 'ipv4'
def _construct_msg(attr, nlri, withdraw):
return {
'afi_safi': _extract_afi_safi(attr),
'attr': attr,
'nlir': nlri or [],
'withdraw': withdraw or [],
}
def _extract_nlri_list(msg):
try:
if msg['afi_safi'] == 'ipv4':
return msg['nlri']
return msg['attr'][14]['nlri'] # MP_REACH_NLRI(14)
except KeyError:
# Ignore case when no nlri
pass
return []
def _extract_withdraw_list(msg):
try:
if msg['afi_safi'] == 'ipv4':
return msg['withdraw']
return msg['attr'][15]['withdraw'] # MP_UNREACH_NLRI(15)
except KeyError:
# Ignore case when no withdraw
pass
return []
def _nlri_key(nlri):
if isinstance(nlri, (dict, list)):
return json.dumps(nlri)
return str(nlri)
# ADJ_RIB_IN = {
# <peer.factory.peer_addr>: {
# <afi_safi>: {
# <nlri>: <msg>,
# ...
# },
# ...
# },
# ...
# }
ADJ_RIB_IN = {}
@blueprint.route('/peer/<peer_ip>/adj-rib-in')
@auth.login_required
@api_utils.log_request
def peer_adj_rib_in(peer_ip):
"""
Dumps one peer's adj-RIB-in.
"""
return flask.jsonify(ADJ_RIB_IN.get(peer_ip, {}))
# ADJ_RIB_OUT = {
# <peer_ip>: {
# <afi_safi>: {
# <nlri>: <msg>,
# ...
# },
# ...
# },
# ...
# }
ADJ_RIB_OUT = {}
@blueprint.route('/peer/<peer_ip>/adj-rib-out')
@auth.login_required
@api_utils.log_request
def peer_adj_rib_out(peer_ip):
"""
Dumps one peer's adj-RIB-out.
"""
return flask.jsonify(ADJ_RIB_OUT.get(peer_ip, {}))
app.app.register_blueprint(blueprint, url_prefix='/v1-ext')
def send_update(peer_ip, attr, nlri, withdraw):
"""
Wrapper of "yabgp.api.send_update" in order to hook sending UPDATE
messages via REST API.
"""
msg = _construct_msg(attr, nlri, withdraw)
afi_safi = msg['afi_safi']
ADJ_RIB_OUT.setdefault(peer_ip, {})
ADJ_RIB_OUT[peer_ip].setdefault(afi_safi, {})
rib = ADJ_RIB_OUT[peer_ip][afi_safi]
for _nlri in _extract_nlri_list(msg):
rib[_nlri_key(_nlri)] = msg
for _withdraw in _extract_withdraw_list(msg):
rib.pop(_nlri_key(_withdraw), None)
return _send_update(peer_ip, attr, nlri, withdraw)
setattr(api_utils, 'send_update', send_update)
class CliHandler(BaseHandler):
def __init__(self):
super(CliHandler, self).__init__()
def init(self):
pass
def on_update_error(self, peer, timestamp, msg):
LOG.info('[-] UPDATE ERROR: %s', msg)
def route_refresh_received(self, peer, msg, msg_type):
LOG.info('[+] ROUTE_REFRESH received: %s', msg)
def keepalive_received(self, peer, timestamp):
LOG.debug('[+] KEEPALIVE received: %s', peer.factory.peer_addr)
def open_received(self, peer, timestamp, result):
LOG.info('[+] OPEN received: %s', result)
def update_received(self, peer, timestamp, msg):
LOG.info('[+] UPDATE received: %s', msg)
peer_addr = peer.factory.peer_addr
afi_safi = msg['afi_safi']
ADJ_RIB_IN.setdefault(peer.factory.peer_addr, {})
ADJ_RIB_IN[peer_addr].setdefault(afi_safi, {})
rib = ADJ_RIB_IN[peer_addr][afi_safi]
for nlri in _extract_nlri_list(msg):
rib[_nlri_key(nlri)] = msg
for withdraw in _extract_withdraw_list(msg):
rib.pop(_nlri_key(withdraw), None)
def notification_received(self, peer, msg):
LOG.info('[-] NOTIFICATION received: %s', msg)
def on_connection_lost(self, peer):
LOG.info('[-] CONNECTION lost: %s', peer.factory.peer_addr)
def on_connection_failed(self, peer, msg):
LOG.info('[-] CONNECTION failed: %s', msg)
def main():
try:
cli_handler = CliHandler()
prepare_service(handler=cli_handler)
except Exception as e:
print(e)
if __name__ == '__main__':
sys.exit(main())
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