#!/usr/bin/env python
#
#    NEPI, a framework to manage network experiments
#    Copyright (C) 2013 INRIA
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 2 as
#    published by the Free Software Foundation;
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Author: Alina Quereilhac <alina.quereilhac@inria.fr>

from __future__ import print_function

from nepi.execution.ec import ExperimentController 
from nepi.execution.trace import TraceAttr

from test_utils import skipIfNotAlive, skipIf

import os
import time
import unittest

def add_node(ec, emu, addr, prefix):
    node = ec.register_resource("netns::Node")
    ec.register_connection(node, emu)
    
    iface = ec.register_resource("netns::NodeInterface")
    ec.register_connection(iface, node)

    ip = ec.register_resource("netns::IPv4Address")
    ec.set(ip, "ip", addr)
    ec.set(ip, "prefix", prefix)
    ec.register_connection(ip, iface)

    print(ec.get(ip, "ip"), addr)
    print(ec.get(ip, "prefix"), prefix)

    return node, iface

class LinuxNetNSEmulationTest(unittest.TestCase):
    def setUp(self):
        self.fedora_host = "mimas.inria.fr"
        self.fedora_user = "aquereil"
        self.fedora_identity = "%s/.ssh/id_rsa" % (os.environ['HOME'])

    @skipIfNotAlive
    @skipIf(os.getuid() != 0, "Test requires root privileges")
    def t_ping(self, host, user = None, identity = None):
        ec = ExperimentController(exp_id = "test-netns-p2p-ping")
        
        node = ec.register_resource("linux::Node")
        if host == "localhost":
            ec.set(node, "hostname", "localhost")
        else:
            ec.set(node, "hostname", host)
            ec.set(node, "username", user)
            ec.set(node, "identity", identity)
        
        ec.set(node, "cleanProcesses", True)
        #ec.set(node, "cleanHome", True)

        emu = ec.register_resource("linux::netns::Emulation")
        ec.set(emu, "verbose", True)
        ec.register_connection(emu, node)

        netnode1, iface1 = add_node(ec, emu, "10.0.0.1", "24")
        netnode2, iface2 = add_node(ec, emu, "10.0.0.2", "24")
         
        switch = ec.register_resource("netns::Switch")
        ec.register_connection(iface1, switch)
        ec.register_connection(iface2, switch)
 
        ping = ec.register_resource("netns::Application")
        ec.set(ping, "command", "ping -c20 10.0.0.2")
        ec.register_connection(ping, netnode1)

        ec.deploy()

        ec.wait_finished([ping])
        
        stdout = ec.trace(ping, "stdout") 

        expected = "20 packets transmitted, 20 received, 0% packet loss"
        self.assertTrue(stdout.find(expected) > -1)

        ec.shutdown()

    def ztest_ping_fedora(self):
        self.t_ping(self.fedora_host, self.fedora_user, self.fedora_identity)

    def test_ping_local(self):
        self.t_ping("localhost")


if __name__ == '__main__':
    unittest.main()