#! /usr/bin/python3

# SPDX-License-Identifier: GPL-2.0-or-later
#
# avocado/pasta.py - Basic tests for pasta mode
#
# Copyright Red Hat
# Author: David Gibson <david@gibson.dropbear.id.au>

import contextlib
import ipaddress
import os

from tasst import Tasst
from tasst.address import LOOPBACK4, LOOPBACK6
from tasst.dhcp import BaseDhcpTasst, DhcpTasstInfo
from tasst.dhcpv6 import BaseDhcpv6Tasst, Dhcpv6TasstInfo
from tasst.ndp import BaseNdpTasst, NdpTasstInfo
from tasst.nstool import UnshareSite
from tasst.scenario.simple import simple_net
from tasst.transfer import BaseTransferTasst, TcpUploadTasst, UdpTransferTasst, TransferTasstInfo
from tasst.typing import typecheck


PASTA_BIN = './pasta'


class BasePastaTasst(Tasst):
    IN_FWD_PORT = 10002
    SPLICE_FWD_PORT = 10003

    @contextlib.contextmanager
    def setup_pasta(self, configure=False):
        name = type(self).__name__
        with simple_net(name) as simnet:
            with UnshareSite(name + '.guestns', '-Ucnpf --mount-proc',
                             parent=simnet.simhost, sudo=True) as simnet.guestns:

                relpid = simnet.guestns.relative_pid(simnet.simhost)

                pidfile = os.path.join(self.workdir, 'pasta.pid')

                extra = ''
                if configure:
                    extra = '--config-net'

                pastacmd = ('{} -f -t {} -u {} -T {} -U {} -P {} {} {}'
                            .format(PASTA_BIN, self.IN_FWD_PORT, self.IN_FWD_PORT,
                                    self.SPLICE_FWD_PORT, self.SPLICE_FWD_PORT,
                                    pidfile, extra, relpid))

                with simnet.simhost.bg(pastacmd) as pasta:
                    # Wait for the pidfile to be written
                    while not os.path.exists(pidfile) or not open(pidfile).read():
                        pass
                    # PID of pasta process in simhost namespace
                    pid = int(open(pidfile).read())

                    yield simnet

                    simnet.simhost.fg('kill -TERM {}'.format(pid))
                    rc = pasta.wait(timeout=1.0)
                    self.assertEquals(rc, 0)


class PastaTasst(BasePastaTasst):
    def test_ifname(self):
        with self.setup_pasta() as simnet:
            self.assertCountEqual(simnet.guestns.ifs(), ('lo', simnet.ifname))


class PastaNdpTasst(BasePastaTasst, BaseNdpTasst):
    @contextlib.contextmanager
    def setup_ndp(self):
        with self.setup_pasta() as simnet:
            simnet.guestns.ifup(simnet.ifname)
            yield NdpTasstInfo(simnet.guestns, simnet.ifname, simnet.ip6.network, simnet.gw_ip6_ll.ip)


class PastaDhcpTasst(BasePastaTasst, BaseDhcpTasst):
    @contextlib.contextmanager
    def setup_dhcp(self):
        with self.setup_pasta() as simnet:
            yield DhcpTasstInfo(simnet.guestns, simnet.ifname, simnet.ip4.ip, simnet.gw_ip4.ip, 65520)


class PastaDhcpv6Tasst(BasePastaTasst, BaseDhcpv6Tasst):
    @contextlib.contextmanager
    def setup_dhcpv6(self):
        with self.setup_pasta() as simnet:
            yield Dhcpv6TasstInfo(simnet.guestns, simnet.ifname, simnet.ip6.ip)


class PastaConfigNetTasst(BasePastaTasst):
    def test_addr(self):
        with self.setup_pasta(configure=True) as simnet:
            addrs = simnet.guestns.addrs(simnet.ifname, scope='global')
            self.assertCountEqual(addrs, [simnet.ip4, simnet.ip6])

    def test_route4(self):
        with self.setup_pasta(configure=True) as simnet:
            (defroute,) = simnet.guestns.routes4(dst='default')
            gateway = ipaddress.ip_address(defroute['gateway'])
            self.assertEquals(gateway, simnet.gw_ip4.ip)

    def test_route6(self):
        with self.setup_pasta(configure=True) as simnet:
            (defroute,) = simnet.guestns.routes6(dst='default')
            gateway = ipaddress.ip_address(defroute['gateway'])
            self.assertEquals(gateway, simnet.gw_ip6_ll.ip)

    def test_mtu(self):
        with self.setup_pasta(configure=True) as simnet:
            mtu = simnet.guestns.mtu(simnet.ifname)
            self.assertEquals(mtu, 65520)


class PastaOutwardTransferTasst(BasePastaTasst, BaseTransferTasst):
    """
    :avocado: disable
    """

    OUT_CONNECT_PORT = 10000

    @contextlib.contextmanager
    def setup_transfer(self):
        with self.setup_pasta(configure=True) as simnet:
            yield TransferTasstInfo(self.DATAFILE, simnet.guestns, simnet.gw,
                                    simnet.remote_ip4.ip, simnet.remote_ip6.ip,
                                    self.OUT_CONNECT_PORT)


class PastaOutwardSmallTcpUploadTasst(PastaOutwardTransferTasst, TcpUploadTasst):
    DATAFILE = './test/small.bin'


class PastaOutwardBigTcpUploadTasst(PastaOutwardSmallTcpUploadTasst):
    DATAFILE = './test/big.bin'
    timeout = 30.0


class PastaOutwardUdpTransferTasst(PastaOutwardTransferTasst, UdpTransferTasst):
    DATAFILE = './test/medium.bin'


class PastaInwardTransferTasst(BasePastaTasst, BaseTransferTasst):
    """
    :avocado: disable
    """

    @contextlib.contextmanager
    def setup_transfer(self):
        with self.setup_pasta(configure=True) as simnet:
            yield TransferTasstInfo(self.DATAFILE, simnet.gw, simnet.guestns,
                                    simnet.ip4.ip, simnet.ip6.ip, self.IN_FWD_PORT,
                                    from_ip4=simnet.remote_ip4.ip, from_ip6=simnet.remote_ip6.ip)


class PastaInwardSmallTcpUploadTasst(PastaInwardTransferTasst, TcpUploadTasst):
    DATAFILE = './test/small.bin'


class PastaInwardBigTcpUploadTasst(PastaInwardSmallTcpUploadTasst):
    DATAFILE = './test/big.bin'
    timeout = 30.0


class PastaInwardUdpTransferTasst(PastaInwardTransferTasst, UdpTransferTasst):
    DATAFILE = './test/medium.bin'


class PastaSplicedTransferTasst(BasePastaTasst, BaseTransferTasst):
    """
    :avocado: disable
    """

    @contextlib.contextmanager
    def setup_transfer(self):
        with self.setup_pasta(configure=True) as simnet:
            yield TransferTasstInfo(self.DATAFILE, simnet.guestns, simnet.simhost,
                                    LOOPBACK4, LOOPBACK6, self.SPLICE_FWD_PORT,
                                    listen_ip4=LOOPBACK4, listen_ip6=LOOPBACK6)


class PastaSplicedSmallTcpUploadTasst(PastaSplicedTransferTasst, TcpUploadTasst):
    DATAFILE = './test/small.bin'


class PastaSplicedBigTcpUploadTasst(PastaSplicedSmallTcpUploadTasst):
    DATAFILE = './test/big.bin'
    timeout = 30.0


class PastaSplicedUdpTransferTasst(PastaSplicedTransferTasst, UdpTransferTasst):
    DATAFILE = './test/medium.bin'