#!/usr/bin/env python

#
# test_bfd_topo2.py
# Part of NetDEF Topology Tests
#
# Copyright (c) 2019 by
# Network Device Education Foundation, Inc. ("NetDEF")
#
# 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_bfd_topo2.py: Test the FRR BFD daemon with multihop and BGP
unnumbered.
"""

import os
import sys
import json
from functools import partial
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

pytestmark = [pytest.mark.bfdd, pytest.mark.bgpd, pytest.mark.ospfd]


def setup_module(mod):
    "Sets up the pytest environment"
    topodef = {
        "s1": ("r1", "r2"),
        "s2": ("r2", "r3"),
        "s3": ("r2", "r4"),
    }
    tgen = Topogen(topodef, mod.__name__)
    tgen.start_topology()

    router_list = tgen.routers()
    for rname, router in router_list.items():
        daemon_file = "{}/{}/zebra.conf".format(CWD, rname)
        router.load_config(TopoRouter.RD_ZEBRA, daemon_file)

        daemon_file = "{}/{}/bfdd.conf".format(CWD, rname)
        if os.path.isfile(daemon_file):
            router.load_config(TopoRouter.RD_BFD, daemon_file)

        daemon_file = "{}/{}/bgpd.conf".format(CWD, rname)
        if os.path.isfile(daemon_file):
            router.load_config(TopoRouter.RD_BGP, daemon_file)

        daemon_file = "{}/{}/ospfd.conf".format(CWD, rname)
        if os.path.isfile(daemon_file):
            router.load_config(TopoRouter.RD_OSPF, daemon_file)

        daemon_file = "{}/{}/ospf6d.conf".format(CWD, rname)
        if os.path.isfile(daemon_file):
            router.load_config(TopoRouter.RD_OSPF6, daemon_file)

    # Initialize all routers.
    tgen.start_router()


def teardown_module(_mod):
    "Teardown the pytest environment"
    tgen = get_topogen()
    tgen.stop_topology()


def test_protocols_convergence():
    """
    Assert that all protocols have converged before checking for the BFD
    statuses as they depend on it.
    """
    tgen = get_topogen()
    if tgen.routers_have_failure():
        pytest.skip(tgen.errors)

    # Check IPv4 routing tables.
    logger.info("Checking IPv4 routes for convergence")
    for router in tgen.routers().values():
        json_file = "{}/{}/ipv4_routes.json".format(CWD, router.name)
        if not os.path.isfile(json_file):
            logger.info("skipping file {}".format(json_file))
            continue

        expected = json.loads(open(json_file).read())
        test_func = partial(
            topotest.router_json_cmp, router, "show ip route json", expected
        )
        _, result = topotest.run_and_expect(test_func, None, count=40, wait=2)
        assertmsg = '"{}" JSON output mismatches'.format(router.name)
        assert result is None, assertmsg

    # Check IPv6 routing tables.
    logger.info("Checking IPv6 routes for convergence")
    for router in tgen.routers().values():
        json_file = "{}/{}/ipv6_routes.json".format(CWD, router.name)
        if not os.path.isfile(json_file):
            logger.info("skipping file {}".format(json_file))
            continue

        expected = json.loads(open(json_file).read())
        test_func = partial(
            topotest.router_json_cmp, router, "show ipv6 route json", expected
        )
        _, result = topotest.run_and_expect(test_func, None, count=40, wait=2)
        assertmsg = '"{}" JSON output mismatches'.format(router.name)
        assert result is None, assertmsg


def test_bfd_connection():
    "Assert that the BFD peers can find themselves."
    tgen = get_topogen()
    if tgen.routers_have_failure():
        pytest.skip(tgen.errors)

    logger.info("waiting for bfd peers to go up")

    for router in tgen.routers().values():
        json_file = "{}/{}/peers.json".format(CWD, router.name)
        expected = json.loads(open(json_file).read())

        test_func = partial(
            topotest.router_json_cmp, router, "show bfd peers json", expected
        )
        _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
        assertmsg = '"{}" JSON output mismatches'.format(router.name)
        assert result is None, assertmsg


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))