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#!/usr/bin/env python
#
# test_bgp_lu.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2020 by Volta Networks
#
# Permission to use, copy, modify, and/or distribute this software
# for any purpose with or without fee is hereby granted, provided
# that the above copyright notice and this permission notice appear
# in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
#
"""
test_bgp_lu.py: Test BGP LU label allocation
"""
import os
import sys
import json
from functools import partial
from time import sleep
import pytest
# Save the Current Working Directory to find configuration files.
CWD = os.path.dirname(os.path.realpath(__file__))
sys.path.append(os.path.join(CWD, "../"))
# pylint: disable=C0413
# Import topogen and topotest helpers
from lib import topotest
from lib.topogen import Topogen, TopoRouter, get_topogen
from lib.topolog import logger
# Required to instantiate the topology builder class.
from lib.micronet_compat import Topo
pytestmark = [pytest.mark.bgpd]
# Basic scenario for BGP-LU. Nodes are directly connected.
# Node 3 is advertising many routes to 2, which advertises them
# as BGP-LU to 1; this way we get routes with actual labels, as
# opposed to implicit-null routes in the 2-node case.
#
# AS1 BGP-LU AS2 iBGP AS2
# +-----+ +-----+ +-----+
# | |.1 .2| |.2 .3| |
# | 1 +----------------+ 2 +-----------------+ 3 |
# | | 10.0.0.0/24 | | 10.0.1.0/24 | |
# +-----+ +-----+ +-----+
def build_topo(tgen):
"Build function"
# This function only purpose is to define allocation and relationship
# between routers, switches and hosts.
#
#
# Create routers
tgen.add_router("R1")
tgen.add_router("R2")
tgen.add_router("R3")
# R1-R2
switch = tgen.add_switch("s1")
switch.add_link(tgen.gears["R1"])
switch.add_link(tgen.gears["R2"])
# R2-R3
switch = tgen.add_switch("s2")
switch.add_link(tgen.gears["R2"])
switch.add_link(tgen.gears["R3"])
def setup_module(mod):
"Sets up the pytest environment"
# This function initiates the topology build with Topogen...
tgen = Topogen(build_topo, mod.__name__)
# ... and here it calls Mininet initialization functions.
tgen.start_topology()
# This is a sample of configuration loading.
router_list = tgen.routers()
# For all registred routers, load the zebra configuration file
for rname, router in router_list.items():
router.load_config(
TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
)
router.load_config(
TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
)
# After loading the configurations, this function loads configured daemons.
tgen.start_router()
def teardown_module(mod):
"Teardown the pytest environment"
tgen = get_topogen()
# This function tears down the whole topology.
tgen.stop_topology()
def check_labelpool(router):
json_file = "{}/{}/labelpool.summ.json".format(CWD, router.name)
expected = json.loads(open(json_file).read())
test_func = partial(
topotest.router_json_cmp, router, "show bgp labelpool summary json", expected
)
_, result = topotest.run_and_expect(test_func, None, count=20, wait=1)
assertmsg = '"{}" JSON output mismatches - Did not converge'.format(router.name)
assert result is None, assertmsg
def test_converge_bgplu():
"Wait for protocol convergence"
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# tgen.mininet_cli();
r1 = tgen.gears["R1"]
r2 = tgen.gears["R2"]
check_labelpool(r1)
check_labelpool(r2)
def test_clear_bgplu():
"Wait for protocol convergence"
tgen = get_topogen()
# Don't run this test if we have any failure.
if tgen.routers_have_failure():
pytest.skip(tgen.errors)
# tgen.mininet_cli();
r1 = tgen.gears["R1"]
r2 = tgen.gears["R2"]
r1.vtysh_cmd("clear bgp 10.0.0.2")
check_labelpool(r1)
check_labelpool(r2)
r2.vtysh_cmd("clear bgp 10.0.1.3")
check_labelpool(r1)
check_labelpool(r2)
r1.vtysh_cmd("clear bgp 10.0.0.2")
r2.vtysh_cmd("clear bgp 10.0.1.3")
check_labelpool(r1)
check_labelpool(r2)
def test_memory_leak():
"Run the memory leak test and report results."
tgen = get_topogen()
if not tgen.is_memleak_enabled():
pytest.skip("Memory leak test/report is disabled")
tgen.report_memory_leaks()
if __name__ == "__main__":
args = ["-s"] + sys.argv[1:]
sys.exit(pytest.main(args))
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