text: #!/usr/bin/env python
  
  # TODO add onos-app-fwd to features
  # TODO check if service is running... i think this might already be done by mn
  
  from mininet.node import Controller, OVSSwitch, CPULimitedHost, RemoteController
  from mininet.net import Mininet
  from mininet.cli import CLI
  from mininet.topo import LinearTopo, Topo
  from mininet.log import setLogLevel, info, warn
  from mininet.util import quietRun, numCores
  
  from shutil import copyfile
  from os import environ, path
  from functools import partial
  import time
  from sys import argv
  from time import sleep
  from sets import Set
  
  class ONOS( Controller ):
      "TODO"
  
      onosDir = '/opt/onos/'
  
      def __init__( self, name, onosDir=onosDir,
                    reactive=True, features=[ 'onos-app-tvue' ],
                    **kwargs ):
          '''TODO'''
  
          Controller.__init__( self, name, **kwargs )
          # the following have been done for us:
          #self.ip = ip ('127.0.0.1')
          #self.port = port (6653)
          #self.protocol = protocol ('tcp')
          #self.checkListening()
  
          self.onosDir = onosDir
          self.karafDir = onosDir + 'apache-karaf-3.0.5/'
          self.instanceDir = self.karafDir
  
          # add default modules
          # TODO: consider an ordered set
          self.features = Set([ 'webconsole',
                                'onos-rest',
                                'onos-api',
                                'onos-cli',
                                'onos-openflow' ])
          self.features.update( features )
          # add reactive forwarding modules
          if reactive:
              self.features.update( ['onos-app-fwd', 
                                     'onos-app-proxyarp',
                                     'onos-app-mobility' ] )
          # add the distributed core if we are in a namespace with no trivial core
          if self.inNamespace and 'onos-core-trivial' not in self.features:
              self.features.add( 'onos-core' )
          # if there is no core, add the trivial one
          if 'onos-core' not in self.features:
              self.features.add( 'onos-core-trivial' )
          print self.features  
     
      def start( self ):
          if self.inNamespace:
              instanceOpts = ( '-furl mvn:org.onosproject/onos-features/1.6.0/xml/features '
                               '-s 8101' )
              if self.ip is not None:
                  instanceOpts += (' -a %s' % self.IP() )
              self.userCmd( self.karafDir + 'bin/instance create %s %s' % ( instanceOpts, self.name ) )
              self.instanceDir = self.karafDir + 'instances/%s/' % self.name
          else:
              # we are running in the root namespace, so let's use the root instance
              # clean up the data directory
              #self.userCmd( 'rm -rf '+ self.karafDir + 'data/' )
              pass
  
          self.userCmd( 'rm -rf '+ self.instanceDir + 'data/' )
  
          # Update etc/org.apache.karaf.features.cfg
          self.updateFeatures()
  
          # TODO 2. Update etc/hazelcast.xml : interface lines
          #cp etc/hazelcast.xml instances/c1/etc/
          self.updateHazelcast()
  
          # TODO 3. Update etc/system.properties : onos.ip
          # TODO 4. Update config/cluster.json : with all nodes
  
          # start onos
          self.userCmd( '%sbin/instance start -d %s' % ( self.karafDir, self.name ) )
          #TODO we should wait for startup...
  
      def stop( self ):
          self.userCmd( self.instanceDir + 'bin/stop' )
          #if self.inNamespace:
          #    self.userCmd( self.karafDir + 'bin/instance destroy %s' % self.name )
          self.terminate()
  
      def updateHazelcast( self ):
          hz = '192.168.123.*'
          if self.ip is not None:
              hz = '.'.join(self.ip.split('.')[:-1]) + '.*'
  
          readfile = self.karafDir + 'etc/hazelcast.xml'
          writefile = self.instanceDir + 'etc/hazelcast.xml'
          with open( readfile, 'r' ) as r:
              with open( writefile, 'w' ) as w:
                  for line in r.readlines():
                      if '<interface>' in line:
                          line = '<interface>' + hz + '</interface>\n'
                      w.write( line )
  
      def updateFeatures( self ):
          filename = self.instanceDir + 'etc/org.apache.karaf.features.cfg'
          with open( filename, 'r+' ) as f:
              lines = f.readlines()
              f.seek(0)
              f.truncate()
              for line in lines:
                  #print '?', line,
                  if 'featuresBoot=' in line:
                      # parse the features from the line
                      features = line.rstrip().split('=')[1].split(',')
                      # add the features to our features set
                      self.features.update( features )
                      # generate the new features line
                      line = 'featuresBoot=' + ','.join( self.features ) + '\n'
                      #print '!', line,
                  f.write( line )
  
  
      @classmethod
      def isAvailable( self ):
          return quietRun( 'ls %s' % self.onosDir )
  
      def userCmd( self, cmd ):
          # switch to the non-root user because karaf gets upset otherwise
          # because the .m2repo is not stored with root
          cmd = 'sudo -u %s %s' % ( self.findUser(), cmd )
          return self.cmd( cmd )
  
      @staticmethod
      def findUser():
          "Try to return logged-in (usually non-root) user"
          try:
              # If we're running sudo
              return os.environ[ 'SUDO_USER' ]
          except:
              try:
                  # Logged-in user (if we have a tty)
                  return quietRun( 'who am i' ).split()[ 0 ]
              except:
                  # Give up and return effective user
                  return quietRun( 'whoami' )
   
  
  class ControlNetwork( Topo ):
      "Control Network Topology"
      def __init__( self, n, dataController=ONOS, **kwargs ):
          """n: number of data network controller nodes
             dataController: class for data network controllers"""
          Topo.__init__( self, **kwargs )
          # Connect everything to a single switch
          cs0 = self.addSwitch( 'cs0' )
          # Add hosts which will serve as data network controllers
          for i in range( 1, n+1 ):
              c = self.addHost( 'c%s' % i, cls=dataController,
                                inNamespace=True )
              self.addLink( c, cs0 )
          # Connect switch to root namespace so that data network
          # switches will be able to talk to us
          root = self.addHost( 'root', inNamespace=False )
          self.addLink( root, cs0 )
  
  class ONOSCluster( Controller ):
      # TODO
      n = 3
     
      def start( self ):
          ctopo = ControlNetwork( n=self.n, dataController=ONOS )
          self.cnet = Mininet( topo=ctopo, ipBase='192.168.123.0/24', controller=None )
          self.cnet.addController( 'cc0', controller=Controller )
          self.cnet.start()
  
          self.ctrls = []
          for host in self.cnet.hosts:
              if isinstance( host, Controller ):
                  self.ctrls.append( host )
                  host.start()
  
      def stop( self ):
          for host in self.cnet.hosts:
              if isinstance( host, Controller ):
                  host.stop()
          self.cnet.stop()
          
      def clist( self ):
          "Return list of Controller proxies for this ONOS cluster"
          print 'controllers:', self.ctrls
          return self.ctrls
  
  class OVSSwitchONOS( OVSSwitch ):
      "OVS switch which connects to multiple controllers"
      def start( self, controllers ):
          assert len( controllers ) == 1
          c0 = controllers[ 0 ]
          assert type( c0 ) == ONOSCluster
          controllers = c0.clist()
          OVSSwitch.start( self, controllers )
  
  controllers = { 'onos': ONOS }
  switches = { 'ovso': OVSSwitchONOS }
  
  if __name__ == '__main__':
      # Simple test for ONOS() controller class
      setLogLevel( 'info' ) #TODO info
      size = 2 if len( argv ) != 2 else int( argv[ 1 ] )
      net = Mininet( topo=LinearTopo( size ),
                     #controller=ONOS,
                     controller=partial( ONOSCluster, n=3 ), #TODO
                     switch=OVSSwitchONOS )
      net.start()
      #waitConnected( net.switches )
      CLI( net )
      net.stop()
  