added default controller class

bin/mn

@@ -25,7 +25,7 @@ from mininet.cli import CLI
 from mininet.log import lg, LEVELS, info, debug, error
 from mininet.net import Mininet, MininetWithControlNet, VERSION
 from mininet.node import ( Host, CPULimitedHost, Controller, OVSController,
-                           NOX, RemoteController, UserSwitch, OVSKernelSwitch,
+                           NOX, RemoteController, DefaultController, UserSwitch, OVSKernelSwitch,
                            OVSLegacyKernelSwitch, IVSSwitch )
 from mininet.link import Link, TCLink
 from mininet.topo import SingleSwitchTopo, LinearTopo, SingleSwitchReversedTopo
@@ -53,11 +53,12 @@ HOSTS = { 'proc': Host,
           'rt': custom( CPULimitedHost, sched='rt' ),
           'cfs': custom( CPULimitedHost, sched='cfs' ) }
 
-CONTROLLERDEF = 'ovsc'
+CONTROLLERDEF = 'default'
 CONTROLLERS = { 'ref': Controller,
                 'ovsc': OVSController,
                 'nox': NOX,
                 'remote': RemoteController,
+                'default': DefaultController,
                 'none': lambda name: None }
 
 LINKDEF = 'default'

mininet/net.py

@@ -95,7 +95,7 @@ from itertools import chain, groupby
 
 from mininet.cli import CLI
 from mininet.log import info, error, debug, output
-from mininet.node import Host, OVSKernelSwitch, Controller
+from mininet.node import Host, OVSKernelSwitch, DefaultController, Controller
 from mininet.link import Link, Intf
 from mininet.util import quietRun, fixLimits, numCores, ensureRoot
 from mininet.util import macColonHex, ipStr, ipParse, netParse, ipAdd
@@ -213,16 +213,17 @@ class Mininet( object ):
         if not controller:
             controller = self.controller
         # Construct new controller if one is not given
-        if isinstance(name, Controller):
+        if isinstance( name, Controller ):
             controller_new = name
             # Pylint thinks controller is a str()
             # pylint: disable=E1103
             name = controller_new.name
             # pylint: enable=E1103
         else:
+            # bookmark
             controller_new = controller( name, **params )
         # Add new controller to net
-        if controller_new:  # allow controller-less setups
+        if controller_new: # allow controller-less setups
             self.controllers.append( controller_new )
             self.nameToNode[ name ] = controller_new
         return controller_new

mininet/node.py

@@ -1278,6 +1278,15 @@ class Controller( Node ):
             self.__class__.__name__, self.name,
             self.IP(), self.port, self.pid )
 
+class DefaultController( Controller ):
+    "find any controller that is available and run it"
+    def __init__( self, name, **kwargs ):
+        "search for any installed controller"
+        controllers = [ 'controller', 'ovs-controller', 'test-controller' ] # , 'pox', 'ryu' ] # test-controller is the important part
+        for c in controllers:
+            if quietRun( "which " + c ):
+                Controller.__init__( self, name, controller=c, **kwargs )
+                break
 
 class OVSController( Controller ):
     "Open vSwitch controller"