NePA TesT: Community Network Emulator

#!/usr/bin/env python

"""

Mininet runner

author: Brandon Heller (brandonh@stanford.edu)

To see options:

  sudo mn -h

Example to pull custom params (topo, switch, etc.) from a file:

  sudo mn --custom ~/mininet/custom/custom_example.py

"""

from optparse import OptionParser

import os.path

import sys

import time

from mininet.clean import cleanup

from mininet.log import lg, LEVELS, info

from mininet.net import Mininet, init

from mininet.node import KernelSwitch, Host, Controller, ControllerParams, NOX

from mininet.node import RemoteController, UserSwitch, OVSKernelSwitch

from mininet.topo import SingleSwitchTopo, LinearTopo, SingleSwitchReversedTopo

from mininet.topolib import TreeTopo

from mininet.util import makeNumeric

# built in topologies, created only when run

TOPODEF = 'minimal'

TOPOS = { 'minimal': lambda: SingleSwitchTopo( k=2 ),

         'linear': LinearTopo,

         'reversed': SingleSwitchReversedTopo,

         'single': SingleSwitchTopo,

         'tree': TreeTopo }

SWITCHDEF = 'kernel'

SWITCHES = { 'kernel': KernelSwitch,

            'user': UserSwitch,

            'ovsk': OVSKernelSwitch }

HOSTDEF = 'process'

HOSTS = { 'process': Host }

CONTROLLERDEF = 'ref'

# a and b are the name and inNamespace params.

CONTROLLERS = { 'ref': Controller,

               'nox_dump': lambda name: NOX( name, 'packetdump' ),

               'nox_pysw': lambda name: NOX( name, 'pyswitch' ),

               'remote': lambda name: None,

               'none': lambda name: None }

# optional tests to run

TESTS = [ 'cli', 'build', 'pingAll', 'pingPair', 'iperf', 'all', 'iperfUdp',

         'none' ]

def buildTopo( topo ):

    "Create topology from string with format (object, arg1, arg2,...)."

    topo_split = topo.split( ',' )

    topo_name = topo_split[ 0 ]

    topo_params = topo_split[ 1: ]

    # Convert int and float args; removes the need for every topology to

    # be flexible with input arg formats.

    topo_seq_params = [ s for s in topo_params if '=' not in s ]

    topo_seq_params = [ makeNumeric( s ) for s in topo_seq_params ]

    topo_kw_params = {}

    for s in [ p for p in topo_params if '=' in p ]:

        key, val = s.split( '=' )

        topo_kw_params[ key ] = makeNumeric( val )

    if topo_name not in TOPOS.keys():

        raise Exception( 'Invalid topo_name %s' % topo_name )

    return TOPOS[ topo_name ]( *topo_seq_params, **topo_kw_params )

def addDictOption( opts, choicesDict, default, name, helpStr=None ):

    """Convenience function to add choices dicts to OptionParser.

       opts: OptionParser instance

       choicesDict: dictionary of valid choices, must include default

       default: default choice key

       name: long option name

       help: string"""

    if default not in choicesDict:

        raise Exception( 'Invalid  default %s for choices dict: %s' %

                        ( default, name ) )

    if not helpStr:

        helpStr = '[' + ' '.join( choicesDict.keys() ) + ']'

    opts.add_option( '--' + name,

                    type='choice',

                    choices=choicesDict.keys(),

                    default = default,

                    help = helpStr )

class MininetRunner( object ):

    "Build, setup, and run Mininet."

    def __init__( self ):

        "Init."

        self.options = None

        self.validate = None

        self.parseArgs()

        self.setup()

        self.begin()

    def setCustom( self, name, value ):

        "Set custom parameters for MininetRunner."

        if name in ( 'topos', 'switches', 'hosts', 'controllers' ):

            # Update dictionaries

            param = name.upper()

            globals()[ param ].update( value )

        elif name == 'validate':

            # Add custom validate function

            self.validate = value

        else:

            # Add or modify global variable or class

            globals()[ name ] = value

    def parseCustomFile( self, fileName ):

        "Parse custom file and add params before parsing cmd-line options."

        custom = {}

        if os.path.isfile( fileName ):

            execfile( fileName, custom, custom )

            for name in custom:

                self.setCustom( name, custom[ name ] )

        else:

            raise Exception( 'could not find custom file: %s' % fileName )

    def parseArgs( self ):

        """Parse command-line args and return options object.

           returns: opts parse options dict"""

        if '--custom' in sys.argv:

            print "custom in sys.argv"

            index = sys.argv.index( '--custom' )

            if len( sys.argv ) > index + 1:

                custom = sys.argv[ index + 1 ]

                self.parseCustomFile( custom )

            else:

                raise Exception( 'Custom file name not found' )

        opts = OptionParser()

        addDictOption( opts, SWITCHES, SWITCHDEF, 'switch' )

        addDictOption( opts, HOSTS, HOSTDEF, 'host' )

        addDictOption( opts, CONTROLLERS, CONTROLLERDEF, 'controller' )

        opts.add_option( '--topo', type='string', default=TOPODEF,

                        help='[' + ' '.join( TOPOS.keys() ) + '],arg1,arg2,'

                        '...argN')

        opts.add_option( '--clean', '-c', action='store_true',

                        default=False, help='clean and exit' )

        opts.add_option( '--custom', type='string', default=None,

                        help='read custom topo and node params from .py file' )

        opts.add_option( '--test', type='choice', choices=TESTS,

                        default=TESTS[ 0 ],

                        help='[' + ' '.join( TESTS ) + ']' )

        opts.add_option( '--xterms', '-x', action='store_true',

                        default=False, help='spawn xterms for each node' )

        opts.add_option( '--mac', action='store_true',

                        default=False, help='set MACs equal to DPIDs' )

        opts.add_option( '--arp', action='store_true',

                        default=False, help='set all-pairs ARP entries' )

        opts.add_option( '--verbosity', '-v', type='choice',

                        choices=LEVELS.keys(), default = 'info',

                        help = '[' + ' '.join( LEVELS.keys() ) + ']' )

        opts.add_option( '--ip', type='string', default='127.0.0.1',

                        help='[ip address as a dotted decimal string for a'

                        'remote controller]' )

        opts.add_option( '--port', type='int', default=6633,

                        help='[port integer for a listening remote'

                        ' controller]' )

        opts.add_option( '--inNamespace', action='store_true',

                        default=False, help='sw and ctrl in namespace?' )

        self.options = opts.parse_args()[ 0 ]

    def setup( self ):

        "Setup and validate environment."

        # set logging verbosity

        if LEVELS[self.options.verbosity] > LEVELS['output']:

            print ( '*** WARNING: selected verbosity level (%s) will hide CLI '

                    'output!\n'

                    'Please restart Mininet with -v [debug, info, output].' )

        lg.setLogLevel( self.options.verbosity )

        # validate environment setup

        init()

    def begin( self ):

        "Create and run mininet."

        if self.options.clean:

            cleanup()

            exit()

        start = time.time()

        topo = buildTopo( self.options.topo )

        switch = SWITCHES[ self.options.switch ]

        host = HOSTS[ self.options.host ]

        controller = CONTROLLERS[ self.options.controller ]

        if self.options.controller == 'remote':

            controller = lambda a: RemoteController( a,

                             defaultIP=self.options.ip,

                             port=self.options.port )

        if self.validate:

            self.validate( self.options )

        controllerParams = ControllerParams( '10.0.0.0', 8 )

        inNamespace = self.options.inNamespace

        xterms = self.options.xterms

        mac = self.options.mac

        arp = self.options.arp

        mn = Mininet( topo, switch, host, controller, controllerParams,

                     inNamespace=inNamespace,

                     xterms=xterms, autoSetMacs=mac,

                     autoStaticArp=arp )

        test = self.options.test

        if test == 'none':

            mn.start()

            mn.stop()

        elif test == 'cli':

            mn.interact()

        elif test == 'all':

            mn.start()

            mn.ping()

            mn.iperf()

            mn.stop()

        elif test != 'build':

            mn.run( getattr( mn, test ) )

        elapsed = float( time.time() - start )

        info( 'completed in %0.3f seconds\n' % elapsed )

if __name__ == "__main__":

    MininetRunner()