ndn/experiments/mcn_failure_experiment.py

# -*- Mode:python; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
#
# Copyright (C) 2015-2017, The University of Memphis,
#                          Arizona Board of Regents,
#                          Regents of the University of California.
#
# This file is part of Mini-NDN.
# See AUTHORS.md for a complete list of Mini-NDN authors and contributors.
#
# Mini-NDN is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Mini-NDN 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.
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# along with Mini-NDN, e.g., in COPYING.md file.
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from ndn.experiments.experiment import Experiment

import time

class MCNFailureExperiment(Experiment):

    def __init__(self, args):
        args["nPings"] = 300
        Experiment.__init__(self, args)

        self.PING_COLLECTION_TIME_BEFORE_FAILURE = 60
        self.PING_COLLECTION_TIME_AFTER_RECOVERY = 120

    def getMostConnectedNode(self):
        mcn = max(self.net.hosts, key=lambda host: len(host.intfNames()))
        print "The most connected node is: %s" % mcn.name
        return mcn

    def run(self):
        mostConnectedNode = self.getMostConnectedNode()

        self.startPctPings()

        # After the pings are scheduled, collect pings for 1 minute
        time.sleep(self.PING_COLLECTION_TIME_BEFORE_FAILURE)

        # Bring down MCN
        self.failNode(mostConnectedNode)

        # MCN is down for 2 minutes
        time.sleep(120)

        # Bring MCN back up
        self.recoverNode(mostConnectedNode)

        # Restart pings
        for nodeToPing in self.pingedDict[mostConnectedNode]:
            self.ping(mostConnectedNode, nodeToPing, self.PING_COLLECTION_TIME_AFTER_RECOVERY)

        # Collect pings for more seconds after MCN is up
        time.sleep(self.PING_COLLECTION_TIME_AFTER_RECOVERY)

Experiment.register("failure-mcn", MCNFailureExperiment)