NePA TesT: Community Network Emulator

import mininet.node

class OVSIntf( Intf ):

    "Patch interface on an OVSSwitch"

    def ifconfig( self, cmd ):

        if cmd == 'up':

            "OVSIntf is always up"

            return

        else:

            raise Exception( 'OVSIntf cannot do ifconfig ' + cmd )

class OVSLink( Link ):

    "Link that makes patch links between OVSSwitches"

    def __init__( self, node1, node2, **kwargs ):

        "See Link.__init__() for options"

        self.isPatchLink = False

        if ( type( node1 ) is mininet.node.OVSSwitch and

             type( node2 ) is mininet.node.OVSSwitch ):

             self.isPatchLink = True

             kwargs.update( cls1=OVSIntf, cls2=OVSIntf )

        Link.__init__( self, node1, node2, **kwargs )

    def makeIntfPair( self, *args, **kwargs ):

        "Usually delegated to OVSSwitch"

        if self.isPatchLink:

            return None, None

        else:

            return Link.makeIntfPair( *args, **kwargs )