xterms.py

#!/usr/bin/python

"Create a network and run an xterm (connected via screen) on each host."

import os
from subprocess import Popen
from mininet import init, TreeNet, Cli, quietRun

def makeXterm( node, title ):
   "Run screen on a node, and hook up an xterm."
   node.cmdPrint( 'screen -dmS ' + node.name )
   cmd = 'xterm -title ' + title + ':' + node.name
   cmd += ' -e screen -D -RR -S ' + node.name
   return Popen( cmd.split( ' ' ) )

def makeXterms( nodes, title ):
   terms = []
   for node in nodes:
      if not node.execed:
         terms += [ makeXterm( node, title ) ]
   return terms

def xterms( controllers, switches, hosts ):
   terms = []
   terms += makeXterms( controllers, 'controller' )
   terms += makeXterms( switches, 'switch' )
   terms += makeXterms( hosts, 'host' )
   # Wait for completion
   for term in terms:
      os.waitpid( term.pid, 0 )
   
def treeXterms():
   print "Running xterms on", os.environ[ 'DISPLAY' ]
   network = TreeNet( depth=2, fanout=4, kernel=True )
   network.run( xterms )
      
if __name__ == '__main__':
   init()
   treeXterms()