examples/miniedit.py

#!/usr/bin/env python

"""
MiniEdit: a simple network editor for Mininet

This is a simple demonstration of how one might build a
GUI application using Mininet as the network model.

Bob Lantz, April 2010
Gregory Gee, July 2013

Controller icon from http://semlabs.co.uk/
OpenFlow icon from https://www.opennetworking.org/
"""

import json
import os
import re
import sys

from functools import partial
from optparse import OptionParser  # pylint: disable=deprecated-module
from subprocess import call
from sys import exit  # pylint: disable=redefined-builtin

from mininet.log import info, debug, warn, setLogLevel
from mininet.net import Mininet, VERSION
from mininet.util import (netParse, ipAdd, quietRun,
                          buildTopo, custom, customClass, StrictVersion )
from mininet.term import makeTerm, cleanUpScreens
from mininet.node import (Controller, RemoteController, NOX, OVSController,
                          CPULimitedHost, Host, Node,
                          OVSSwitch, UserSwitch, IVSSwitch )
from mininet.link import TCLink, Intf, Link
from mininet.cli import CLI
from mininet.moduledeps import moduleDeps
from mininet.topo import SingleSwitchTopo, LinearTopo, SingleSwitchReversedTopo
from mininet.topolib import TreeTopo

# pylint: disable=import-error
if sys.version_info[0] == 2:
    from Tkinter import ( Frame, Label, LabelFrame, Entry, OptionMenu,
                          Checkbutton, Menu, Toplevel, Button, BitmapImage,
                          PhotoImage, Canvas, Scrollbar, Wm, TclError,
                          StringVar, IntVar, E, W, EW, NW, Y, VERTICAL, SOLID,
                          CENTER, RIGHT, LEFT, BOTH, TRUE, FALSE )
    from ttk import Notebook
    from tkMessageBox import showerror
    import tkFont
    import tkFileDialog
    import tkSimpleDialog
else:
    from tkinter import ( Frame, Label, LabelFrame, Entry, OptionMenu,
                          Checkbutton, Menu, Toplevel, Button, BitmapImage,
                          PhotoImage, Canvas, Scrollbar, Wm, TclError,
                          StringVar, IntVar, E, W, EW, NW, Y, VERTICAL, SOLID,
                          CENTER, RIGHT, LEFT, BOTH, TRUE, FALSE )
    from tkinter.ttk import Notebook
    from tkinter.messagebox import showerror
    from tkinter import font as tkFont
    from tkinter import simpledialog as tkSimpleDialog
    from tkinter import filedialog as tkFileDialog
# someday: from ttk import *
# pylint: enable=import-error


# Miniedit still needs work in order to pass pylint...
# pylint: disable=line-too-long,too-many-branches
# pylint: disable=too-many-statements,attribute-defined-outside-init
# pylint: disable=missing-docstring,too-many-ancestors
# pylint: disable=too-many-nested-blocks,too-many-arguments


MINIEDIT_VERSION = '2.2.0.1'

if 'PYTHONPATH' in os.environ:
    sys.path = os.environ[ 'PYTHONPATH' ].split( ':' ) + sys.path

info( 'MiniEdit running against Mininet '+VERSION, '\n' )
MININET_VERSION = re.sub(r'[^\d\.]', '', VERSION)

TOPODEF = 'none'
TOPOS = { 'minimal': lambda: SingleSwitchTopo( k=2 ),
          'linear': LinearTopo,
          'reversed': SingleSwitchReversedTopo,
          'single': SingleSwitchTopo,
          'none': None,
          'tree': TreeTopo }
CONTROLLERDEF = 'ref'
CONTROLLERS = { 'ref': Controller,
                'ovsc': OVSController,
                'nox': NOX,
                'remote': RemoteController,
                'none': lambda name: None }
LINKDEF = 'default'
LINKS = { 'default': Link,
          'tc': TCLink }
HOSTDEF = 'proc'
HOSTS = { 'proc': Host,
          'rt': custom( CPULimitedHost, sched='rt' ),
          'cfs': custom( CPULimitedHost, sched='cfs' ) }


class InbandController( RemoteController ):
    "RemoteController that ignores checkListening"
    def checkListening( self ):
        "Overridden to do nothing."
        return

class CustomUserSwitch(UserSwitch):
    "Customized UserSwitch"
    def __init__( self, name, dpopts='--no-slicing', **kwargs ):
        UserSwitch.__init__( self, name, **kwargs )
        self.switchIP = None

    def getSwitchIP(self):
        "Return management IP address"
        return self.switchIP

    def setSwitchIP(self, ip):
        "Set management IP address"
        self.switchIP = ip

    def start( self, controllers ):
        "Start and set management IP address"
        # Call superclass constructor
        UserSwitch.start( self, controllers )
        # Set Switch IP address
        if self.switchIP is not None:
            if not self.inNamespace:
                self.cmd( 'ifconfig', self, self.switchIP )
            else:
                self.cmd( 'ifconfig lo', self.switchIP )

class LegacyRouter( Node ):
    "Simple IP router"
    def __init__( self, name, inNamespace=True, **params ):
        Node.__init__( self, name, inNamespace, **params )

    # pylint: disable=arguments-differ
    def config( self, **_params ):
        if self.intfs:
            self.setParam( _params, 'setIP', ip='0.0.0.0' )
        r = Node.config( self, **_params )
        self.cmd('sysctl -w net.ipv4.ip_forward=1')
        return r

class LegacySwitch(OVSSwitch):
    "OVS switch in standalone/bridge mode"
    def __init__( self, name, **params ):
        OVSSwitch.__init__( self, name, failMode='standalone', **params )
        self.switchIP = None

class customOvs(OVSSwitch):
    "Customized OVS switch"

    def __init__( self, name, failMode='secure', datapath='kernel', **params ):
        OVSSwitch.__init__( self, name, failMode=failMode, datapath=datapath,**params )
        self.switchIP = None

    def getSwitchIP(self):
        "Return management IP address"
        return self.switchIP

    def setSwitchIP(self, ip):
        "Set management IP address"
        self.switchIP = ip

    def start( self, controllers ):
        "Start and set management IP address"
        # Call superclass constructor
        OVSSwitch.start( self, controllers )
        # Set Switch IP address
        if self.switchIP is not None:
            self.cmd( 'ifconfig', self, self.switchIP )

class PrefsDialog(tkSimpleDialog.Dialog):
    "Preferences dialog"

    def __init__(self, parent, title, prefDefaults):

        self.prefValues = prefDefaults

        tkSimpleDialog.Dialog.__init__(self, parent, title)

    def body(self, master):
        "Create dialog body"
        self.rootFrame = master
        self.leftfieldFrame = Frame(self.rootFrame, padx=5, pady=5)
        self.leftfieldFrame.grid(row=0, column=0, sticky='nswe', columnspan=2)
        self.rightfieldFrame = Frame(self.rootFrame, padx=5, pady=5)
        self.rightfieldFrame.grid(row=0, column=2, sticky='nswe', columnspan=2)

        # Field for Base IP
        Label(self.leftfieldFrame, text="IP Base:").grid(row=0, sticky=E)
        self.ipEntry = Entry(self.leftfieldFrame)
        self.ipEntry.grid(row=0, column=1)
        ipBase =  self.prefValues['ipBase']
        self.ipEntry.insert(0, ipBase)

        # Selection of terminal type
        Label(self.leftfieldFrame, text="Default Terminal:").grid(row=1, sticky=E)
        self.terminalVar = StringVar(self.leftfieldFrame)
        self.terminalOption = OptionMenu(self.leftfieldFrame, self.terminalVar, "xterm", "gterm")
        self.terminalOption.grid(row=1, column=1, sticky=W)
        terminalType = self.prefValues['terminalType']
        self.terminalVar.set(terminalType)

        # Field for CLI
        Label(self.leftfieldFrame, text="Start CLI:").grid(row=2, sticky=E)
        self.cliStart = IntVar()
        self.cliButton = Checkbutton(self.leftfieldFrame, variable=self.cliStart)
        self.cliButton.grid(row=2, column=1, sticky=W)
        if self.prefValues['startCLI'] == '0':
            self.cliButton.deselect()
        else:
            self.cliButton.select()

        # Selection of switch type
        Label(self.leftfieldFrame, text="Default Switch:").grid(row=3, sticky=E)
        self.switchType = StringVar(self.leftfieldFrame)
        self.switchTypeMenu = OptionMenu(self.leftfieldFrame, self.switchType, "Open vSwitch Kernel Mode", "Indigo Virtual Switch", "Userspace Switch", "Userspace Switch inNamespace")
        self.switchTypeMenu.grid(row=3, column=1, sticky=W)
        switchTypePref = self.prefValues['switchType']
        if switchTypePref == 'ivs':
            self.switchType.set("Indigo Virtual Switch")
        elif switchTypePref == 'userns':
            self.switchType.set("Userspace Switch inNamespace")
        elif switchTypePref == 'user':
            self.switchType.set("Userspace Switch")
        else:
            self.switchType.set("Open vSwitch Kernel Mode")


        # Fields for OVS OpenFlow version
        ovsFrame= LabelFrame(self.leftfieldFrame, text='Open vSwitch', padx=5, pady=5)
        ovsFrame.grid(row=4, column=0, columnspan=2, sticky=EW)
        Label(ovsFrame, text="OpenFlow 1.0:").grid(row=0, sticky=E)
        Label(ovsFrame, text="OpenFlow 1.1:").grid(row=1, sticky=E)
        Label(ovsFrame, text="OpenFlow 1.2:").grid(row=2, sticky=E)
        Label(ovsFrame, text="OpenFlow 1.3:").grid(row=3, sticky=E)

        self.ovsOf10 = IntVar()
        self.covsOf10 = Checkbutton(ovsFrame, variable=self.ovsOf10)
        self.covsOf10.grid(row=0, column=1, sticky=W)
        if self.prefValues['openFlowVersions']['ovsOf10'] == '0':
            self.covsOf10.deselect()
        else:
            self.covsOf10.select()

        self.ovsOf11 = IntVar()
        self.covsOf11 = Checkbutton(ovsFrame, variable=self.ovsOf11)
        self.covsOf11.grid(row=1, column=1, sticky=W)
        if self.prefValues['openFlowVersions']['ovsOf11'] == '0':
            self.covsOf11.deselect()
        else:
            self.covsOf11.select()

        self.ovsOf12 = IntVar()
        self.covsOf12 = Checkbutton(ovsFrame, variable=self.ovsOf12)
        self.covsOf12.grid(row=2, column=1, sticky=W)
        if self.prefValues['openFlowVersions']['ovsOf12'] == '0':
            self.covsOf12.deselect()
        else:
            self.covsOf12.select()

        self.ovsOf13 = IntVar()
        self.covsOf13 = Checkbutton(ovsFrame, variable=self.ovsOf13)
        self.covsOf13.grid(row=3, column=1, sticky=W)
        if self.prefValues['openFlowVersions']['ovsOf13'] == '0':
            self.covsOf13.deselect()
        else:
            self.covsOf13.select()

        # Field for DPCTL listen port
        Label(self.leftfieldFrame, text="dpctl port:").grid(row=5, sticky=E)
        self.dpctlEntry = Entry(self.leftfieldFrame)
        self.dpctlEntry.grid(row=5, column=1)
        if 'dpctl' in self.prefValues:
            self.dpctlEntry.insert(0, self.prefValues['dpctl'])

        # sFlow
        sflowValues = self.prefValues['sflow']
        self.sflowFrame= LabelFrame(self.rightfieldFrame, text='sFlow Profile for Open vSwitch', padx=5, pady=5)
        self.sflowFrame.grid(row=0, column=0, columnspan=2, sticky=EW)

        Label(self.sflowFrame, text="Target:").grid(row=0, sticky=E)
        self.sflowTarget = Entry(self.sflowFrame)
        self.sflowTarget.grid(row=0, column=1)
        self.sflowTarget.insert(0, sflowValues['sflowTarget'])

        Label(self.sflowFrame, text="Sampling:").grid(row=1, sticky=E)
        self.sflowSampling = Entry(self.sflowFrame)
        self.sflowSampling.grid(row=1, column=1)
        self.sflowSampling.insert(0, sflowValues['sflowSampling'])

        Label(self.sflowFrame, text="Header:").grid(row=2, sticky=E)
        self.sflowHeader = Entry(self.sflowFrame)
        self.sflowHeader.grid(row=2, column=1)
        self.sflowHeader.insert(0, sflowValues['sflowHeader'])

        Label(self.sflowFrame, text="Polling:").grid(row=3, sticky=E)
        self.sflowPolling = Entry(self.sflowFrame)
        self.sflowPolling.grid(row=3, column=1)
        self.sflowPolling.insert(0, sflowValues['sflowPolling'])

        # NetFlow
        nflowValues = self.prefValues['netflow']
        self.nFrame= LabelFrame(self.rightfieldFrame, text='NetFlow Profile for Open vSwitch', padx=5, pady=5)
        self.nFrame.grid(row=1, column=0, columnspan=2, sticky=EW)

        Label(self.nFrame, text="Target:").grid(row=0, sticky=E)
        self.nflowTarget = Entry(self.nFrame)
        self.nflowTarget.grid(row=0, column=1)
        self.nflowTarget.insert(0, nflowValues['nflowTarget'])

        Label(self.nFrame, text="Active Timeout:").grid(row=1, sticky=E)
        self.nflowTimeout = Entry(self.nFrame)
        self.nflowTimeout.grid(row=1, column=1)
        self.nflowTimeout.insert(0, nflowValues['nflowTimeout'])

        Label(self.nFrame, text="Add ID to Interface:").grid(row=2, sticky=E)
        self.nflowAddId = IntVar()
        self.nflowAddIdButton = Checkbutton(self.nFrame, variable=self.nflowAddId)
        self.nflowAddIdButton.grid(row=2, column=1, sticky=W)
        if nflowValues['nflowAddId'] == '0':
            self.nflowAddIdButton.deselect()
        else:
            self.nflowAddIdButton.select()

        # initial focus
        return self.ipEntry

    def apply(self):
        ipBase = self.ipEntry.get()
        terminalType = self.terminalVar.get()
        startCLI = str(self.cliStart.get())
        sw = self.switchType.get()
        dpctl = self.dpctlEntry.get()

        ovsOf10 = str(self.ovsOf10.get())
        ovsOf11 = str(self.ovsOf11.get())
        ovsOf12 = str(self.ovsOf12.get())
        ovsOf13 = str(self.ovsOf13.get())

        sflowValues = {'sflowTarget':self.sflowTarget.get(),
                       'sflowSampling':self.sflowSampling.get(),
                       'sflowHeader':self.sflowHeader.get(),
                       'sflowPolling':self.sflowPolling.get()}
        nflowvalues = {'nflowTarget':self.nflowTarget.get(),
                       'nflowTimeout':self.nflowTimeout.get(),
                       'nflowAddId':str(self.nflowAddId.get())}
        self.result = {'ipBase':ipBase,
                       'terminalType':terminalType,
                       'dpctl':dpctl,
                       'sflow':sflowValues,
                       'netflow':nflowvalues,
                       'startCLI':startCLI}
        if sw == 'Indigo Virtual Switch':
            self.result['switchType'] = 'ivs'
            if StrictVersion(MININET_VERSION) < StrictVersion('2.1'):
                self.ovsOk = False
                showerror(title="Error",
                          message='MiniNet version 2.1+ required. You have '+VERSION+'.')
        elif sw == 'Userspace Switch':
            self.result['switchType'] = 'user'
        elif sw == 'Userspace Switch inNamespace':
            self.result['switchType'] = 'userns'
        else:
            self.result['switchType'] = 'ovs'

        self.ovsOk = True
        if ovsOf11 == "1":
            ovsVer = self.getOvsVersion()
            if StrictVersion(ovsVer) < StrictVersion('2.0'):
                self.ovsOk = False
                showerror(title="Error",
                          message='Open vSwitch version 2.0+ required. You have '+ovsVer+'.')
        if ovsOf12 == "1" or ovsOf13 == "1":
            ovsVer = self.getOvsVersion()
            if StrictVersion(ovsVer) < StrictVersion('1.10'):
                self.ovsOk = False
                showerror(title="Error",
                          message='Open vSwitch version 1.10+ required. You have '+ovsVer+'.')

        if self.ovsOk:
            self.result['openFlowVersions']={'ovsOf10':ovsOf10,
                                             'ovsOf11':ovsOf11,
                                             'ovsOf12':ovsOf12,
                                             'ovsOf13':ovsOf13}
        else:
            self.result = None

    @staticmethod
    def getOvsVersion():
        "Return OVS version"
        outp = quietRun("ovs-vsctl --version")
        r = r'ovs-vsctl \(Open vSwitch\) (.*)'
        m = re.search(r, outp)
        if m is None:
            warn( 'Version check failed' )
            return None
        else:
            info( 'Open vSwitch version is '+m.group(1), '\n' )
            return m.group(1)


class CustomDialog(object):

    # TODO: Fix button placement and Title and window focus lock
    def __init__(self, master, _title):
        self.top=Toplevel(master)

        self.bodyFrame = Frame(self.top)
        self.bodyFrame.grid(row=0, column=0, sticky='nswe')
        self.body(self.bodyFrame)

        #return self.b # initial focus
        buttonFrame = Frame(self.top, relief='ridge', bd=3, bg='lightgrey')
        buttonFrame.grid(row=1 , column=0, sticky='nswe')

        okButton = Button(buttonFrame, width=8, text='OK', relief='groove',
                   bd=4, command=self.okAction)
        okButton.grid(row=0, column=0, sticky=E)

        canlceButton = Button(buttonFrame, width=8, text='Cancel', relief='groove',
                    bd=4, command=self.cancelAction)
        canlceButton.grid(row=0, column=1, sticky=W)

    def body(self, master):
        self.rootFrame = master

    def apply(self):
        self.top.destroy()

    def cancelAction(self):
        self.top.destroy()

    def okAction(self):
        self.apply()
        self.top.destroy()

class HostDialog(CustomDialog):

    def __init__(self, master, title, prefDefaults):

        self.prefValues = prefDefaults
        self.result = None

        CustomDialog.__init__(self, master, title)

    def body(self, master):
        self.rootFrame = master
        n = Notebook(self.rootFrame)
        self.propFrame = Frame(n)
        self.vlanFrame = Frame(n)
        self.interfaceFrame = Frame(n)
        self.mountFrame = Frame(n)
        n.add(self.propFrame, text='Properties')
        n.add(self.vlanFrame, text='VLAN Interfaces')
        n.add(self.interfaceFrame, text='External Interfaces')
        n.add(self.mountFrame, text='Private Directories')
        n.pack()

        ### TAB 1
        # Field for Hostname
        Label(self.propFrame, text="Hostname:").grid(row=0, sticky=E)
        self.hostnameEntry = Entry(self.propFrame)
        self.hostnameEntry.grid(row=0, column=1)
        if 'hostname' in self.prefValues:
            self.hostnameEntry.insert(0, self.prefValues['hostname'])

        # Field for Switch IP
        Label(self.propFrame, text="IP Address:").grid(row=1, sticky=E)
        self.ipEntry = Entry(self.propFrame)
        self.ipEntry.grid(row=1, column=1)
        if 'ip' in self.prefValues:
            self.ipEntry.insert(0, self.prefValues['ip'])

        # Field for default route
        Label(self.propFrame, text="Default Route:").grid(row=2, sticky=E)
        self.routeEntry = Entry(self.propFrame)
        self.routeEntry.grid(row=2, column=1)
        if 'defaultRoute' in self.prefValues:
            self.routeEntry.insert(0, self.prefValues['defaultRoute'])

        # Field for CPU
        Label(self.propFrame, text="Amount CPU:").grid(row=3, sticky=E)
        self.cpuEntry = Entry(self.propFrame)
        self.cpuEntry.grid(row=3, column=1)
        if 'cpu' in self.prefValues:
            self.cpuEntry.insert(0, str(self.prefValues['cpu']))
        # Selection of Scheduler
        if 'sched' in self.prefValues:
            sched =  self.prefValues['sched']
        else:
            sched = 'host'
        self.schedVar = StringVar(self.propFrame)
        self.schedOption = OptionMenu(self.propFrame, self.schedVar, "host", "cfs", "rt")
        self.schedOption.grid(row=3, column=2, sticky=W)
        self.schedVar.set(sched)

        # Selection of Cores
        Label(self.propFrame, text="Cores:").grid(row=4, sticky=E)
        self.coreEntry = Entry(self.propFrame)
        self.coreEntry.grid(row=4, column=1)
        if 'cores' in self.prefValues:
            self.coreEntry.insert(1, self.prefValues['cores'])

        # Start command
        Label(self.propFrame, text="Start Command:").grid(row=5, sticky=E)
        self.startEntry = Entry(self.propFrame)
        self.startEntry.grid(row=5, column=1, sticky='nswe', columnspan=3)
        if 'startCommand' in self.prefValues:
            self.startEntry.insert(0, str(self.prefValues['startCommand']))
        # Stop command
        Label(self.propFrame, text="Stop Command:").grid(row=6, sticky=E)
        self.stopEntry = Entry(self.propFrame)
        self.stopEntry.grid(row=6, column=1, sticky='nswe', columnspan=3)
        if 'stopCommand' in self.prefValues:
            self.stopEntry.insert(0, str(self.prefValues['stopCommand']))

        ### TAB 2
        # External Interfaces
        self.externalInterfaces = 0
        Label(self.interfaceFrame, text="External Interface:").grid(row=0, column=0, sticky=E)
        self.b = Button( self.interfaceFrame, text='Add', command=self.addInterface)
        self.b.grid(row=0, column=1)

        self.interfaceFrame = VerticalScrolledTable(self.interfaceFrame, rows=0, columns=1, title='External Interfaces')
        self.interfaceFrame.grid(row=1, column=0, sticky='nswe', columnspan=2)
        self.tableFrame = self.interfaceFrame.interior
        self.tableFrame.addRow(value=['Interface Name'], readonly=True)

        # Add defined interfaces
        externalInterfaces = []
        if 'externalInterfaces' in self.prefValues:
            externalInterfaces = self.prefValues['externalInterfaces']

        for externalInterface in externalInterfaces:
            self.tableFrame.addRow(value=[externalInterface])

        ### TAB 3
        # VLAN Interfaces
        self.vlanInterfaces = 0
        Label(self.vlanFrame, text="VLAN Interface:").grid(row=0, column=0, sticky=E)
        self.vlanButton = Button( self.vlanFrame, text='Add', command=self.addVlanInterface)
        self.vlanButton.grid(row=0, column=1)

        self.vlanFrame = VerticalScrolledTable(self.vlanFrame, rows=0, columns=2, title='VLAN Interfaces')
        self.vlanFrame.grid(row=1, column=0, sticky='nswe', columnspan=2)
        self.vlanTableFrame = self.vlanFrame.interior
        self.vlanTableFrame.addRow(value=['IP Address','VLAN ID'], readonly=True)

        vlanInterfaces = []
        if 'vlanInterfaces' in self.prefValues:
            vlanInterfaces = self.prefValues['vlanInterfaces']
        for vlanInterface in vlanInterfaces:
            self.vlanTableFrame.addRow(value=vlanInterface)

        ### TAB 4
        # Private Directories
        self.privateDirectories = 0
        Label(self.mountFrame, text="Private Directory:").grid(row=0, column=0, sticky=E)
        self.mountButton = Button( self.mountFrame, text='Add', command=self.addDirectory)
        self.mountButton.grid(row=0, column=1)

        self.mountFrame = VerticalScrolledTable(self.mountFrame, rows=0, columns=2, title='Directories')
        self.mountFrame.grid(row=1, column=0, sticky='nswe', columnspan=2)
        self.mountTableFrame = self.mountFrame.interior
        self.mountTableFrame.addRow(value=['Mount','Persistent Directory'], readonly=True)

        directoryList = []
        if 'privateDirectory' in self.prefValues:
            directoryList = self.prefValues['privateDirectory']
        for privateDir in directoryList:
            if isinstance( privateDir, tuple ):
                self.mountTableFrame.addRow(value=privateDir)
            else:
                self.mountTableFrame.addRow(value=[privateDir,''])


    def addDirectory( self ):
        self.mountTableFrame.addRow()

    def addVlanInterface( self ):
        self.vlanTableFrame.addRow()

    def addInterface( self ):
        self.tableFrame.addRow()

    def apply(self):
        externalInterfaces = []
        for row in range(self.tableFrame.rows):
            if (len(self.tableFrame.get(row, 0)) > 0 and
                row > 0):
                externalInterfaces.append(self.tableFrame.get(row, 0))
        vlanInterfaces = []
        for row in range(self.vlanTableFrame.rows):
            if (len(self.vlanTableFrame.get(row, 0)) > 0 and
                len(self.vlanTableFrame.get(row, 1)) > 0 and
                row > 0):
                vlanInterfaces.append([self.vlanTableFrame.get(row, 0), self.vlanTableFrame.get(row, 1)])
        privateDirectories = []
        for row in range(self.mountTableFrame.rows):
            if len(self.mountTableFrame.get(row, 0)) > 0 and row > 0:
                if len(self.mountTableFrame.get(row, 1)) > 0:
                    privateDirectories.append((self.mountTableFrame.get(row, 0), self.mountTableFrame.get(row, 1)))
                else:
                    privateDirectories.append(self.mountTableFrame.get(row, 0))

        results = {'cpu': self.cpuEntry.get(),
                   'cores':self.coreEntry.get(),
                   'sched':self.schedVar.get(),
                   'hostname':self.hostnameEntry.get(),
                   'ip':self.ipEntry.get(),
                   'defaultRoute':self.routeEntry.get(),
                   'startCommand':self.startEntry.get(),
                   'stopCommand':self.stopEntry.get(),
                   'privateDirectory':privateDirectories,
                   'externalInterfaces':externalInterfaces,
                   'vlanInterfaces':vlanInterfaces}
        self.result = results

class SwitchDialog(CustomDialog):

    def __init__(self, master, title, prefDefaults):

        self.prefValues = prefDefaults
        self.result = None
        CustomDialog.__init__(self, master, title)

    def body(self, master):
        self.rootFrame = master
        self.leftfieldFrame = Frame(self.rootFrame)
        self.rightfieldFrame = Frame(self.rootFrame)
        self.leftfieldFrame.grid(row=0, column=0, sticky='nswe')
        self.rightfieldFrame.grid(row=0, column=1, sticky='nswe')

        rowCount = 0
        externalInterfaces = []
        if 'externalInterfaces' in self.prefValues:
            externalInterfaces = self.prefValues['externalInterfaces']

        # Field for Hostname
        Label(self.leftfieldFrame, text="Hostname:").grid(row=rowCount, sticky=E)
        self.hostnameEntry = Entry(self.leftfieldFrame)
        self.hostnameEntry.grid(row=rowCount, column=1)
        self.hostnameEntry.insert(0, self.prefValues['hostname'])
        rowCount+=1

        # Field for DPID
        Label(self.leftfieldFrame, text="DPID:").grid(row=rowCount, sticky=E)
        self.dpidEntry = Entry(self.leftfieldFrame)
        self.dpidEntry.grid(row=rowCount, column=1)
        if 'dpid' in self.prefValues:
            self.dpidEntry.insert(0, self.prefValues['dpid'])
        rowCount+=1

        # Field for Netflow
        Label(self.leftfieldFrame, text="Enable NetFlow:").grid(row=rowCount, sticky=E)
        self.nflow = IntVar()
        self.nflowButton = Checkbutton(self.leftfieldFrame, variable=self.nflow)
        self.nflowButton.grid(row=rowCount, column=1, sticky=W)
        if 'netflow' in self.prefValues:
            if self.prefValues['netflow'] == '0':
                self.nflowButton.deselect()
            else:
                self.nflowButton.select()
        else:
            self.nflowButton.deselect()
        rowCount+=1

        # Field for sflow
        Label(self.leftfieldFrame, text="Enable sFlow:").grid(row=rowCount, sticky=E)
        self.sflow = IntVar()
        self.sflowButton = Checkbutton(self.leftfieldFrame, variable=self.sflow)
        self.sflowButton.grid(row=rowCount, column=1, sticky=W)
        if 'sflow' in self.prefValues:
            if self.prefValues['sflow'] == '0':
                self.sflowButton.deselect()
            else:
                self.sflowButton.select()
        else:
            self.sflowButton.deselect()
        rowCount+=1

        # Selection of switch type
        Label(self.leftfieldFrame, text="Switch Type:").grid(row=rowCount, sticky=E)
        self.switchType = StringVar(self.leftfieldFrame)
        self.switchTypeMenu = OptionMenu(self.leftfieldFrame, self.switchType, "Default", "Open vSwitch Kernel Mode", "Indigo Virtual Switch", "Userspace Switch", "Userspace Switch inNamespace")
        self.switchTypeMenu.grid(row=rowCount, column=1, sticky=W)
        if 'switchType' in self.prefValues:
            switchTypePref = self.prefValues['switchType']
            if switchTypePref == 'ivs':
                self.switchType.set("Indigo Virtual Switch")
            elif switchTypePref == 'userns':
                self.switchType.set("Userspace Switch inNamespace")
            elif switchTypePref == 'user':
                self.switchType.set("Userspace Switch")
            elif switchTypePref == 'ovs':
                self.switchType.set("Open vSwitch Kernel Mode")
            else:
                self.switchType.set("Default")
        else:
            self.switchType.set("Default")
        rowCount+=1

        # Field for Switch IP
        Label(self.leftfieldFrame, text="IP Address:").grid(row=rowCount, sticky=E)
        self.ipEntry = Entry(self.leftfieldFrame)
        self.ipEntry.grid(row=rowCount, column=1)
        if 'switchIP' in self.prefValues:
            self.ipEntry.insert(0, self.prefValues['switchIP'])
        rowCount+=1

        # Field for DPCTL port
        Label(self.leftfieldFrame, text="DPCTL port:").grid(row=rowCount, sticky=E)
        self.dpctlEntry = Entry(self.leftfieldFrame)
        self.dpctlEntry.grid(row=rowCount, column=1)
        if 'dpctl' in self.prefValues:
            self.dpctlEntry.insert(0, self.prefValues['dpctl'])
        rowCount+=1

        # External Interfaces
        Label(self.rightfieldFrame, text="External Interface:").grid(row=0, sticky=E)
        self.b = Button( self.rightfieldFrame, text='Add', command=self.addInterface)
        self.b.grid(row=0, column=1)

        self.interfaceFrame = VerticalScrolledTable(self.rightfieldFrame, rows=0, columns=1, title='External Interfaces')
        self.interfaceFrame.grid(row=1, column=0, sticky='nswe', columnspan=2)
        self.tableFrame = self.interfaceFrame.interior

        # Add defined interfaces
        for externalInterface in externalInterfaces:
            self.tableFrame.addRow(value=[externalInterface])

        self.commandFrame = Frame(self.rootFrame)
        self.commandFrame.grid(row=1, column=0, sticky='nswe', columnspan=2)
        self.commandFrame.columnconfigure(1, weight=1)
        # Start command
        Label(self.commandFrame, text="Start Command:").grid(row=0, column=0, sticky=W)
        self.startEntry = Entry(self.commandFrame)
        self.startEntry.grid(row=0, column=1,  sticky='nsew')
        if 'startCommand' in self.prefValues:
            self.startEntry.insert(0, str(self.prefValues['startCommand']))
        # Stop command
        Label(self.commandFrame, text="Stop Command:").grid(row=1, column=0, sticky=W)
        self.stopEntry = Entry(self.commandFrame)
        self.stopEntry.grid(row=1, column=1, sticky='nsew')
        if 'stopCommand' in self.prefValues:
            self.stopEntry.insert(0, str(self.prefValues['stopCommand']))

    def addInterface( self ):
        self.tableFrame.addRow()

    def defaultDpid( self, name):
        "Derive dpid from switch name, s1 -> 1"
        assert self  # satisfy pylint and allow contextual override
        try:
            dpid = int( re.findall( r'\d+', name )[ 0 ] )
            dpid = hex( dpid )[ 2: ]
            return dpid
        except IndexError:
            return None
            #raise Exception( 'Unable to derive default datapath ID - '
            #                 'please either specify a dpid or use a '
            #                 'canonical switch name such as s23.' )

    def apply(self):
        externalInterfaces = []
        for row in range(self.tableFrame.rows):
            # debug( 'Interface is ' + self.tableFrame.get(row, 0), '\n' )
            if len(self.tableFrame.get(row, 0)) > 0:
                externalInterfaces.append(self.tableFrame.get(row, 0))

        dpid = self.dpidEntry.get()
        if (self.defaultDpid(self.hostnameEntry.get()) is None
           and len(dpid) == 0):
            showerror(title="Error",
                          message= 'Unable to derive default datapath ID - '
                             'please either specify a DPID or use a '
                             'canonical switch name such as s23.' )


        results = {'externalInterfaces':externalInterfaces,
                   'hostname':self.hostnameEntry.get(),
                   'dpid':dpid,
                   'startCommand':self.startEntry.get(),
                   'stopCommand':self.stopEntry.get(),
                   'sflow':str(self.sflow.get()),
                   'netflow':str(self.nflow.get()),
                   'dpctl':self.dpctlEntry.get(),
                   'switchIP':self.ipEntry.get()}
        sw = self.switchType.get()
        if sw == 'Indigo Virtual Switch':
            results['switchType'] = 'ivs'
            if StrictVersion(MININET_VERSION) < StrictVersion('2.1'):
                self.ovsOk = False
                showerror(title="Error",
                          message='MiniNet version 2.1+ required. You have '+VERSION+'.')
        elif sw == 'Userspace Switch inNamespace':
            results['switchType'] = 'userns'
        elif sw == 'Userspace Switch':
            results['switchType'] = 'user'
        elif sw == 'Open vSwitch Kernel Mode':
            results['switchType'] = 'ovs'
        else:
            results['switchType'] = 'default'
        self.result = results


class VerticalScrolledTable(LabelFrame):
    """A pure Tkinter scrollable frame that actually works!

    * Use the 'interior' attribute to place widgets inside the scrollable frame
    * Construct and pack/place/grid normally
    * This frame only allows vertical scrolling

    """
    def __init__(self, parent, rows=2, columns=2, title=None, **kw):
        LabelFrame.__init__(self, parent, text=title, padx=5, pady=5, **kw)

        # create a canvas object and a vertical scrollbar for scrolling it
        vscrollbar = Scrollbar(self, orient=VERTICAL)
        vscrollbar.pack(fill=Y, side=RIGHT, expand=FALSE)
        canvas = Canvas(self, bd=0, highlightthickness=0,
                        yscrollcommand=vscrollbar.set)
        canvas.pack(side=LEFT, fill=BOTH, expand=TRUE)
        vscrollbar.config(command=canvas.yview)

        # reset the view
        canvas.xview_moveto(0)
        canvas.yview_moveto(0)

        # create a frame inside the canvas which will be scrolled with it
        self.interior = interior = TableFrame(canvas, rows=rows, columns=columns)
        interior_id = canvas.create_window(0, 0, window=interior,
                                           anchor=NW)

        # track changes to the canvas and frame width and sync them,
        # also updating the scrollbar
        def _configure_interior(_event):
        # update the scrollbars to match the size of the inner frame
            size = (interior.winfo_reqwidth(), interior.winfo_reqheight())
            canvas.config(scrollregion="0 0 %s %s" % size)
            if interior.winfo_reqwidth() != canvas.winfo_width():
            # update the canvas's width to fit the inner frame
                canvas.config(width=interior.winfo_reqwidth())
        interior.bind('<Configure>', _configure_interior)

        def _configure_canvas(_event):
            if interior.winfo_reqwidth() != canvas.winfo_width():
                # update the inner frame's width to fill the canvas
                canvas.itemconfigure(interior_id, width=canvas.winfo_width())
        canvas.bind('<Configure>', _configure_canvas)

class TableFrame(Frame):
    def __init__(self, parent, rows=2, columns=2):

        Frame.__init__(self, parent, background="black")
        self._widgets = []
        self.rows = rows
        self.columns = columns
        for row in range(rows):
            current_row = []
            for column in range(columns):
                label = Entry(self, borderwidth=0)
                label.grid(row=row, column=column, sticky="wens", padx=1, pady=1)
                current_row.append(label)
            self._widgets.append(current_row)

    def set(self, row, column, value):
        widget = self._widgets[row][column]
        widget.insert(0, value)

    def get(self, row, column):
        widget = self._widgets[row][column]
        return widget.get()

    def addRow( self, value=None, readonly=False ):
        # debug( "Adding row " + str(self.rows +1), '\n' )
        current_row = []
        for column in range(self.columns):
            label = Entry(self, borderwidth=0)
            label.grid(row=self.rows, column=column, sticky="wens", padx=1, pady=1)
            if value is not None:
                label.insert(0, value[column])
            if readonly:
                label.configure(state='readonly')
            current_row.append(label)
        self._widgets.append(current_row)
        self.update_idletasks()
        self.rows += 1

class LinkDialog(tkSimpleDialog.Dialog):

    def __init__(self, parent, title, linkDefaults):

        self.linkValues = linkDefaults

        tkSimpleDialog.Dialog.__init__(self, parent, title)

    def body(self, master):

        self.var = StringVar(master)
        Label(master, text="Bandwidth:").grid(row=0, sticky=E)
        self.e1 = Entry(master)
        self.e1.grid(row=0, column=1)
        Label(master, text="Mbit").grid(row=0, column=2, sticky=W)
        if 'bw' in self.linkValues:
            self.e1.insert(0,str(self.linkValues['bw']))

        Label(master, text="Delay:").grid(row=1, sticky=E)
        self.e2 = Entry(master)
        self.e2.grid(row=1, column=1)
        if 'delay' in self.linkValues:
            self.e2.insert(0, self.linkValues['delay'])

        Label(master, text="Loss:").grid(row=2, sticky=E)
        self.e3 = Entry(master)
        self.e3.grid(row=2, column=1)
        Label(master, text="%").grid(row=2, column=2, sticky=W)
        if 'loss' in self.linkValues:
            self.e3.insert(0, str(self.linkValues['loss']))

        Label(master, text="Max Queue size:").grid(row=3, sticky=E)
        self.e4 = Entry(master)
        self.e4.grid(row=3, column=1)
        if 'max_queue_size' in self.linkValues:
            self.e4.insert(0, str(self.linkValues['max_queue_size']))

        Label(master, text="Jitter:").grid(row=4, sticky=E)
        self.e5 = Entry(master)
        self.e5.grid(row=4, column=1)
        if 'jitter' in self.linkValues:
            self.e5.insert(0, self.linkValues['jitter'])

        Label(master, text="Speedup:").grid(row=5, sticky=E)
        self.e6 = Entry(master)
        self.e6.grid(row=5, column=1)
        if 'speedup' in self.linkValues:
            self.e6.insert(0, str(self.linkValues['speedup']))

        return self.e1 # initial focus

    def apply(self):
        self.result = {}
        if len(self.e1.get()) > 0:
            self.result['bw'] = int(self.e1.get())
        if len(self.e2.get()) > 0:
            self.result['delay'] = self.e2.get()
        if len(self.e3.get()) > 0:
            self.result['loss'] = int(self.e3.get())
        if len(self.e4.get()) > 0:
            self.result['max_queue_size'] = int(self.e4.get())
        if len(self.e5.get()) > 0:
            self.result['jitter'] = self.e5.get()
        if len(self.e6.get()) > 0:
            self.result['speedup'] = int(self.e6.get())

class ControllerDialog(tkSimpleDialog.Dialog):

    def __init__(self, parent, title, ctrlrDefaults=None):

        if ctrlrDefaults:
            self.ctrlrValues = ctrlrDefaults

        tkSimpleDialog.Dialog.__init__(self, parent, title)

    def body(self, master):

        self.var = StringVar(master)
        self.protcolvar = StringVar(master)

        rowCount=0
        # Field for Hostname
        Label(master, text="Name:").grid(row=rowCount, sticky=E)
        self.hostnameEntry = Entry(master)
        self.hostnameEntry.grid(row=rowCount, column=1)
        self.hostnameEntry.insert(0, self.ctrlrValues['hostname'])
        rowCount+=1

        # Field for Remove Controller Port
        Label(master, text="Controller Port:").grid(row=rowCount, sticky=E)
        self.e2 = Entry(master)
        self.e2.grid(row=rowCount, column=1)
        self.e2.insert(0, self.ctrlrValues['remotePort'])
        rowCount+=1

        # Field for Controller Type
        Label(master, text="Controller Type:").grid(row=rowCount, sticky=E)
        controllerType = self.ctrlrValues['controllerType']
        self.o1 = OptionMenu(master, self.var, "Remote Controller", "In-Band Controller", "OpenFlow Reference", "OVS Controller")
        self.o1.grid(row=rowCount, column=1, sticky=W)
        if controllerType == 'ref':
            self.var.set("OpenFlow Reference")
        elif controllerType == 'inband':
            self.var.set("In-Band Controller")
        elif controllerType == 'remote':
            self.var.set("Remote Controller")
        else:
            self.var.set("OVS Controller")
        rowCount+=1

        # Field for Controller Protcol
        Label(master, text="Protocol:").grid(row=rowCount, sticky=E)
        if 'controllerProtocol' in self.ctrlrValues:
            controllerProtocol = self.ctrlrValues['controllerProtocol']
        else:
            controllerProtocol = 'tcp'
        self.protcol = OptionMenu(master, self.protcolvar, "TCP", "SSL")
        self.protcol.grid(row=rowCount, column=1, sticky=W)
        if controllerProtocol == 'ssl':
            self.protcolvar.set("SSL")
        else:
            self.protcolvar.set("TCP")
        rowCount+=1

        # Field for Remove Controller IP
        remoteFrame= LabelFrame(master, text='Remote/In-Band Controller', padx=5, pady=5)
        remoteFrame.grid(row=rowCount, column=0, columnspan=2, sticky=W)

        Label(remoteFrame, text="IP Address:").grid(row=0, sticky=E)
        self.e1 = Entry(remoteFrame)
        self.e1.grid(row=0, column=1)
        self.e1.insert(0, self.ctrlrValues['remoteIP'])
        rowCount+=1

        return self.hostnameEntry # initial focus

    def apply(self):
        self.result = { 'hostname': self.hostnameEntry.get(),
                        'remoteIP': self.e1.get(),
                        'remotePort': int(self.e2.get())}

        controllerType = self.var.get()
        if controllerType == 'Remote Controller':
            self.result['controllerType'] = 'remote'
        elif controllerType == 'In-Band Controller':
            self.result['controllerType'] = 'inband'
        elif controllerType == 'OpenFlow Reference':
            self.result['controllerType'] = 'ref'
        else:
            self.result['controllerType'] = 'ovsc'
        controllerProtocol = self.protcolvar.get()
        if controllerProtocol == 'SSL':
            self.result['controllerProtocol'] = 'ssl'
        else:
            self.result['controllerProtocol'] = 'tcp'

class ToolTip(object):

    def __init__(self, widget):
        self.widget = widget
        self.tipwindow = None
        self.id = None
        self.x = self.y = 0

    def showtip(self, text):
        "Display text in tooltip window"
        self.text = text
        if self.tipwindow or not self.text:
            return
        x, y, _cx, cy = self.widget.bbox("insert")
        x = x + self.widget.winfo_rootx() + 27
        y = y + cy + self.widget.winfo_rooty() +27
        self.tipwindow = tw = Toplevel(self.widget)
        tw.wm_overrideredirect(1)
        tw.wm_geometry("+%d+%d" % (x, y))
        try:
            # For Mac OS
            # pylint: disable=protected-access
            tw.tk.call("::tk::unsupported::MacWindowStyle",
                       "style", tw._w,
                       "help", "noActivates")
            # pylint: enable=protected-access
        except TclError:
            pass
        label = Label(tw, text=self.text, justify=LEFT,
                      background="#ffffe0", relief=SOLID, borderwidth=1,
                      font=("tahoma", "8", "normal"))
        label.pack(ipadx=1)

    def hidetip(self):
        tw = self.tipwindow
        self.tipwindow = None
        if tw:
            tw.destroy()

class MiniEdit( Frame ):

    "A simple network editor for Mininet."

    def __init__( self, parent=None, cheight=600, cwidth=1000 ):

        self.defaultIpBase='10.0.0.0/8'

        self.nflowDefaults = {'nflowTarget':'',
                              'nflowTimeout':'600',
                              'nflowAddId':'0'}
        self.sflowDefaults = {'sflowTarget':'',
                              'sflowSampling':'400',
                              'sflowHeader':'128',
                              'sflowPolling':'30'}

        self.appPrefs={
            "ipBase": self.defaultIpBase,
            "startCLI": "0",
            "terminalType": 'xterm',
            "switchType": 'ovs',
            "dpctl": '',
            'sflow':self.sflowDefaults,
            'netflow':self.nflowDefaults,
            'openFlowVersions':{'ovsOf10':'1',
                                'ovsOf11':'0',
                                'ovsOf12':'0',
                                'ovsOf13':'0'}

        }


        Frame.__init__( self, parent )
        self.action = None
        self.appName = 'MiniEdit'
        self.fixedFont = tkFont.Font ( family="DejaVu Sans Mono", size="14" )

        # Style
        self.font = ( 'Geneva', 9 )
        self.smallFont = ( 'Geneva', 7 )
        self.bg = 'white'

        # Title
        self.top = self.winfo_toplevel()
        self.top.title( self.appName )

        # Menu bar
        self.createMenubar()

        # Editing canvas
        self.cheight, self.cwidth = cheight, cwidth
        self.cframe, self.canvas = self.createCanvas()

        # Toolbar
        self.controllers = {}

        # Toolbar
        self.images = miniEditImages()
        self.buttons = {}
        self.active = None
        self.tools = ( 'Select', 'Host', 'Switch', 'LegacySwitch', 'LegacyRouter', 'NetLink', 'Controller' )
        self.customColors = { 'Switch': 'darkGreen', 'Host': 'blue' }
        self.toolbar = self.createToolbar()

        # Layout
        self.toolbar.grid( column=0, row=0, sticky='nsew')
        self.cframe.grid( column=1, row=0 )
        self.columnconfigure( 1, weight=1 )
        self.rowconfigure( 0, weight=1 )
        self.pack( expand=True, fill='both' )

        # About box
        self.aboutBox = None

        # Initialize node data
        self.nodeBindings = self.createNodeBindings()
        self.nodePrefixes = { 'LegacyRouter': 'r', 'LegacySwitch': 's', 'Switch': 's', 'Host': 'h' , 'Controller': 'c'}
        self.widgetToItem = {}
        self.itemToWidget = {}

        # Initialize link tool
        self.link = self.linkWidget = None

        # Selection support
        self.selection = None

        # Keyboard bindings
        self.bind( '<Control-q>', lambda event: self.quit() )
        self.bind( '<KeyPress-Delete>', self.deleteSelection )
        self.bind( '<KeyPress-BackSpace>', self.deleteSelection )
        self.focus()

        self.hostPopup = Menu(self.top, tearoff=0)
        self.hostPopup.add_command(label='Host Options', font=self.font)
        self.hostPopup.add_separator()
        self.hostPopup.add_command(label='Properties', font=self.font, command=self.hostDetails )

        self.hostRunPopup = Menu(self.top, tearoff=0)
        self.hostRunPopup.add_command(label='Host Options', font=self.font)
        self.hostRunPopup.add_separator()
        self.hostRunPopup.add_command(label='Terminal', font=self.font, command=self.xterm )

        self.legacyRouterRunPopup = Menu(self.top, tearoff=0)
        self.legacyRouterRunPopup.add_command(label='Router Options', font=self.font)
        self.legacyRouterRunPopup.add_separator()
        self.legacyRouterRunPopup.add_command(label='Terminal', font=self.font, command=self.xterm )

        self.switchPopup = Menu(self.top, tearoff=0)
        self.switchPopup.add_command(label='Switch Options', font=self.font)
        self.switchPopup.add_separator()
        self.switchPopup.add_command(label='Properties', font=self.font, command=self.switchDetails )

        self.switchRunPopup = Menu(self.top, tearoff=0)
        self.switchRunPopup.add_command(label='Switch Options', font=self.font)
        self.switchRunPopup.add_separator()
        self.switchRunPopup.add_command(label='List bridge details', font=self.font, command=self.listBridge )

        self.linkPopup = Menu(self.top, tearoff=0)
        self.linkPopup.add_command(label='Link Options', font=self.font)
        self.linkPopup.add_separator()
        self.linkPopup.add_command(label='Properties', font=self.font, command=self.linkDetails )

        self.linkRunPopup = Menu(self.top, tearoff=0)
        self.linkRunPopup.add_command(label='Link Options', font=self.font)
        self.linkRunPopup.add_separator()
        self.linkRunPopup.add_command(label='Link Up', font=self.font, command=self.linkUp )
        self.linkRunPopup.add_command(label='Link Down', font=self.font, command=self.linkDown )

        self.controllerPopup = Menu(self.top, tearoff=0)
        self.controllerPopup.add_command(label='Controller Options', font=self.font)
        self.controllerPopup.add_separator()
        self.controllerPopup.add_command(label='Properties', font=self.font, command=self.controllerDetails )


        # Event handling initalization
        self.linkx = self.linky = self.linkItem = None
        self.lastSelection = None

        # Model initialization
        self.links = {}
        self.hostOpts = {}
        self.switchOpts = {}
        self.hostCount = 0
        self.switchCount = 0
        self.controllerCount = 0
        self.net = None

        # Close window gracefully
        Wm.wm_protocol( self.top, name='WM_DELETE_WINDOW', func=self.quit )

    def quit( self ):
        "Stop our network, if any, then quit."
        self.stop()
        Frame.quit( self )

    def createMenubar( self ):
        "Create our menu bar."

        font = self.font

        mbar = Menu( self.top, font=font )
        self.top.configure( menu=mbar )


        fileMenu = Menu( mbar, tearoff=False )
        mbar.add_cascade( label="File", font=font, menu=fileMenu )
        fileMenu.add_command( label="New", font=font, command=self.newTopology )
        fileMenu.add_command( label="Open", font=font, command=self.loadTopology )
        fileMenu.add_command( label="Save", font=font, command=self.saveTopology )
        fileMenu.add_command( label="Export Level 2 Script", font=font, command=self.exportScript )
        fileMenu.add_separator()
        fileMenu.add_command( label='Quit', command=self.quit, font=font )

        editMenu = Menu( mbar, tearoff=False )
        mbar.add_cascade( label="Edit", font=font, menu=editMenu )
        editMenu.add_command( label="Cut", font=font,
                              command=lambda: self.deleteSelection( None ) )
        editMenu.add_command( label="Preferences", font=font, command=self.prefDetails)

        runMenu = Menu( mbar, tearoff=False )
        mbar.add_cascade( label="Run", font=font, menu=runMenu )
        runMenu.add_command( label="Run", font=font, command=self.doRun )
        runMenu.add_command( label="Stop", font=font, command=self.doStop )
        fileMenu.add_separator()
        runMenu.add_command( label='Show OVS Summary', font=font, command=self.ovsShow )
        runMenu.add_command( label='Root Terminal', font=font, command=self.rootTerminal )

        # Application menu
        appMenu = Menu( mbar, tearoff=False )
        mbar.add_cascade( label="Help", font=font, menu=appMenu )
        appMenu.add_command( label='About MiniEdit', command=self.about,
                             font=font)
    # Canvas

    def createCanvas( self ):
        "Create and return our scrolling canvas frame."
        f = Frame( self )

        canvas = Canvas( f, width=self.cwidth, height=self.cheight,
                         bg=self.bg )

        # Scroll bars
        xbar = Scrollbar( f, orient='horizontal', command=canvas.xview )
        ybar = Scrollbar( f, orient='vertical', command=canvas.yview )
        canvas.configure( xscrollcommand=xbar.set, yscrollcommand=ybar.set )

        # Resize box
        resize = Label( f, bg='white' )

        # Layout
        canvas.grid( row=0, column=1, sticky='nsew')
        ybar.grid( row=0, column=2, sticky='ns')
        xbar.grid( row=1, column=1, sticky='ew' )
        resize.grid( row=1, column=2, sticky='nsew' )

        # Resize behavior
        f.rowconfigure( 0, weight=1 )
        f.columnconfigure( 1, weight=1 )
        f.grid( row=0, column=0, sticky='nsew' )
        f.bind( '<Configure>', lambda event: self.updateScrollRegion() )

        # Mouse bindings
        canvas.bind( '<ButtonPress-1>', self.clickCanvas )
        canvas.bind( '<B1-Motion>', self.dragCanvas )
        canvas.bind( '<ButtonRelease-1>', self.releaseCanvas )

        return f, canvas

    def updateScrollRegion( self ):
        "Update canvas scroll region to hold everything."
        bbox = self.canvas.bbox( 'all' )
        if bbox is not None:
            self.canvas.configure( scrollregion=( 0, 0, bbox[ 2 ],
                                   bbox[ 3 ] ) )

    def canvasx( self, x_root ):
        "Convert root x coordinate to canvas coordinate."
        c = self.canvas
        return c.canvasx( x_root ) - c.winfo_rootx()

    def canvasy( self, y_root ):
        "Convert root y coordinate to canvas coordinate."
        c = self.canvas
        return c.canvasy( y_root ) - c.winfo_rooty()

    # Toolbar

    def activate( self, toolName ):
        "Activate a tool and press its button."
        # Adjust button appearance
        if self.active:
            self.buttons[ self.active ].configure( relief='raised' )
        self.buttons[ toolName ].configure( relief='sunken' )
        # Activate dynamic bindings
        self.active = toolName


    @staticmethod
    def createToolTip(widget, text):
        toolTip = ToolTip(widget)
        def enter(_event):
            toolTip.showtip(text)
        def leave(_event):
            toolTip.hidetip()
        widget.bind('<Enter>', enter)
        widget.bind('<Leave>', leave)

    def createToolbar( self ):
        "Create and return our toolbar frame."

        toolbar = Frame( self )

        # Tools
        for tool in self.tools:
            cmd = partial( self.activate, tool )
            b = Button( toolbar, text=tool, font=self.smallFont, command=cmd)
            if tool in self.images:
                b.config( height=35, image=self.images[ tool ] )
                self.createToolTip(b, str(tool))
                # b.config( compound='top' )
            b.pack( fill='x' )
            self.buttons[ tool ] = b
        self.activate( self.tools[ 0 ] )

        # Spacer
        Label( toolbar, text='' ).pack()

        # Commands
        for cmd, color in [ ( 'Stop', 'darkRed' ), ( 'Run', 'darkGreen' ) ]:
            doCmd = getattr( self, 'do' + cmd )
            b = Button( toolbar, text=cmd, font=self.smallFont,
                        fg=color, command=doCmd )
            b.pack( fill='x', side='bottom' )

        return toolbar

    def doRun( self ):
        "Run command."
        self.activate( 'Select' )
        for tool in self.tools:
            self.buttons[ tool ].config( state='disabled' )
        self.start()

    def doStop( self ):
        "Stop command."
        self.stop()
        for tool in self.tools:
            self.buttons[ tool ].config( state='normal' )

    def addNode( self, node, nodeNum, x, y, name=None):
        "Add a new node to our canvas."
        if node == 'Switch':
            self.switchCount += 1
        if node == 'Host':
            self.hostCount += 1
        if node == 'Controller':
            self.controllerCount += 1
        if name is None:
            name = self.nodePrefixes[ node ] + nodeNum
        self.addNamedNode(node, name, x, y)

    def addNamedNode( self, node, name, x, y):
        "Add a new node to our canvas."
        icon = self.nodeIcon( node, name )
        item = self.canvas.create_window( x, y, anchor='c', window=icon,
                                          tags=node )
        self.widgetToItem[ icon ] = item
        self.itemToWidget[ item ] = icon
        icon.links = {}

    def convertJsonUnicode(self, text):
        "Some part of Mininet don't like Unicode"
        unicode = globals().get( 'unicode', str )
        if isinstance(text, dict):
            return {self.convertJsonUnicode(key): self.convertJsonUnicode(value) for key, value in text.items()}
        if isinstance(text, list):
            return [self.convertJsonUnicode(element) for element in text]
        if isinstance(text, unicode):  # pylint: disable=undefined-variable
            return text.encode('utf-8')
        return text

    def loadTopology( self ):
        "Load command."
        c = self.canvas

        myFormats = [
            ('Mininet Topology','*.mn'),
            ('All Files','*'),
        ]
        f = tkFileDialog.askopenfile(filetypes=myFormats, mode='rb')
        if f is None:
            return
        self.newTopology()
        loadedTopology = self.convertJsonUnicode(json.load(f))

        # Load application preferences
        if 'application' in loadedTopology:
            self.appPrefs.update(loadedTopology['application'])
            if "ovsOf10" not in self.appPrefs["openFlowVersions"]:
                self.appPrefs["openFlowVersions"]["ovsOf10"] = '0'
            if "ovsOf11" not in self.appPrefs["openFlowVersions"]:
                self.appPrefs["openFlowVersions"]["ovsOf11"] = '0'
            if "ovsOf12" not in self.appPrefs["openFlowVersions"]:
                self.appPrefs["openFlowVersions"]["ovsOf12"] = '0'
            if "ovsOf13" not in self.appPrefs["openFlowVersions"]:
                self.appPrefs["openFlowVersions"]["ovsOf13"] = '0'
            if "sflow" not in self.appPrefs:
                self.appPrefs["sflow"] = self.sflowDefaults
            if "netflow" not in self.appPrefs:
                self.appPrefs["netflow"] = self.nflowDefaults

        # Load controllers
        if 'controllers' in loadedTopology:
            if loadedTopology['version'] == '1':
                # This is old location of controller info
                hostname = 'c0'
                self.controllers = {}
                self.controllers[hostname] = loadedTopology['controllers']['c0']
                self.controllers[hostname]['hostname'] = hostname
                self.addNode('Controller', 0, float(30), float(30), name=hostname)
                icon = self.findWidgetByName(hostname)
                icon.bind('<Button-3>', self.do_controllerPopup )
            else:
                controllers = loadedTopology['controllers']
                for controller in controllers:
                    hostname = controller['opts']['hostname']
                    x = controller['x']
                    y = controller['y']
                    self.addNode('Controller', 0, float(x), float(y), name=hostname)
                    self.controllers[hostname] = controller['opts']
                    icon = self.findWidgetByName(hostname)
                    icon.bind('<Button-3>', self.do_controllerPopup )


        # Load hosts
        hosts = loadedTopology['hosts']
        for host in hosts:
            nodeNum = host['number']
            hostname = 'h'+nodeNum
            if 'hostname' in host['opts']:
                hostname = host['opts']['hostname']
            else:
                host['opts']['hostname'] = hostname
            if 'nodeNum' not in host['opts']:
                host['opts']['nodeNum'] = int(nodeNum)
            x = host['x']
            y = host['y']
            self.addNode('Host', nodeNum, float(x), float(y), name=hostname)

            # Fix JSON converting tuple to list when saving
            if 'privateDirectory' in host['opts']:
                newDirList = []
                for privateDir in host['opts']['privateDirectory']:
                    if isinstance( privateDir, list ):
                        newDirList.append((privateDir[0],privateDir[1]))
                    else:
                        newDirList.append(privateDir)
                host['opts']['privateDirectory'] = newDirList
            self.hostOpts[hostname] = host['opts']
            icon = self.findWidgetByName(hostname)
            icon.bind('<Button-3>', self.do_hostPopup )

        # Load switches
        switches = loadedTopology['switches']
        for switch in switches:
            nodeNum = switch['number']
            hostname = 's'+nodeNum
            if 'controllers' not in switch['opts']:
                switch['opts']['controllers'] = []
            if 'switchType' not in switch['opts']:
                switch['opts']['switchType'] = 'default'
            if 'hostname' in switch['opts']:
                hostname = switch['opts']['hostname']
            else:
                switch['opts']['hostname'] = hostname
            if 'nodeNum' not in switch['opts']:
                switch['opts']['nodeNum'] = int(nodeNum)
            x = switch['x']
            y = switch['y']
            if switch['opts']['switchType'] == "legacyRouter":
                self.addNode('LegacyRouter', nodeNum, float(x), float(y), name=hostname)
                icon = self.findWidgetByName(hostname)
                icon.bind('<Button-3>', self.do_legacyRouterPopup )
            elif switch['opts']['switchType'] == "legacySwitch":
                self.addNode('LegacySwitch', nodeNum, float(x), float(y), name=hostname)
                icon = self.findWidgetByName(hostname)
                icon.bind('<Button-3>', self.do_legacySwitchPopup )
            else:
                self.addNode('Switch', nodeNum, float(x), float(y), name=hostname)
                icon = self.findWidgetByName(hostname)
                icon.bind('<Button-3>', self.do_switchPopup )
            self.switchOpts[hostname] = switch['opts']

            # create links to controllers
            if int(loadedTopology['version']) > 1:
                controllers = self.switchOpts[hostname]['controllers']
                for controller in controllers:
                    dest = self.findWidgetByName(controller)
                    dx, dy = self.canvas.coords( self.widgetToItem[ dest ] )
                    self.link = self.canvas.create_line(float(x),
                                                        float(y),
                                                        dx,
                                                        dy,
                                                        width=4,
                                                        fill='red',
                                                        dash=(6, 4, 2, 4),
                                                        tag='link' )
                    c.itemconfig(self.link, tags=c.gettags(self.link)+('control',))
                    self.addLink( icon, dest, linktype='control' )
                    self.createControlLinkBindings()
                    self.link = self.linkWidget = None
            else:
                dest = self.findWidgetByName('c0')
                dx, dy = self.canvas.coords( self.widgetToItem[ dest ] )
                self.link = self.canvas.create_line(float(x),
                                                    float(y),
                                                    dx,
                                                    dy,
                                                    width=4,
                                                    fill='red',
                                                    dash=(6, 4, 2, 4),
                                                    tag='link' )
                c.itemconfig(self.link, tags=c.gettags(self.link)+('control',))
                self.addLink( icon, dest, linktype='control' )
                self.createControlLinkBindings()
                self.link = self.linkWidget = None

        # Load links
        links = loadedTopology['links']
        for link in links:
            srcNode = link['src']
            src = self.findWidgetByName(srcNode)
            sx, sy = self.canvas.coords( self.widgetToItem[ src ] )

            destNode = link['dest']
            dest = self.findWidgetByName(destNode)
            dx, dy = self.canvas.coords( self.widgetToItem[ dest]  )

            self.link = self.canvas.create_line( sx, sy, dx, dy, width=4,
                                             fill='blue', tag='link' )
            c.itemconfig(self.link, tags=c.gettags(self.link)+('data',))
            self.addLink( src, dest, linkopts=link['opts'] )
            self.createDataLinkBindings()
            self.link = self.linkWidget = None

        f.close()

    def findWidgetByName( self, name ):
        for widget in self.widgetToItem:
            if name ==  widget[ 'text' ]:
                return widget
        return None

    def newTopology( self ):
        "New command."
        for widget in tuple( self.widgetToItem ):
            self.deleteItem( self.widgetToItem[ widget ] )
        self.hostCount = 0
        self.switchCount = 0
        self.controllerCount = 0
        self.links = {}
        self.hostOpts = {}
        self.switchOpts = {}
        self.controllers = {}
        self.appPrefs["ipBase"]= self.defaultIpBase

    def saveTopology( self ):
        "Save command."
        myFormats = [
            ('Mininet Topology','*.mn'),
            ('All Files','*'),
        ]

        savingDictionary = {}
        fileName = tkFileDialog.asksaveasfilename(filetypes=myFormats ,title="Save the topology as...")
        if len(fileName ) > 0:
            # Save Application preferences
            savingDictionary['version'] = '2'

            # Save Switches and Hosts
            hostsToSave = []
            switchesToSave = []
            controllersToSave = []
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                x1, y1 = self.canvas.coords( item )
                if 'Switch' in tags or 'LegacySwitch' in tags or 'LegacyRouter' in tags:
                    nodeNum = self.switchOpts[name]['nodeNum']
                    nodeToSave = {'number':str(nodeNum),
                                  'x':str(x1),
                                  'y':str(y1),
                                  'opts':self.switchOpts[name] }
                    switchesToSave.append(nodeToSave)
                elif 'Host' in tags:
                    nodeNum = self.hostOpts[name]['nodeNum']
                    nodeToSave = {'number':str(nodeNum),
                                  'x':str(x1),
                                  'y':str(y1),
                                  'opts':self.hostOpts[name] }
                    hostsToSave.append(nodeToSave)
                elif 'Controller' in tags:
                    nodeToSave = {'x':str(x1),
                                  'y':str(y1),
                                  'opts':self.controllers[name] }
                    controllersToSave.append(nodeToSave)
                else:
                    raise Exception( "Cannot create mystery node: " + name )
            savingDictionary['hosts'] = hostsToSave
            savingDictionary['switches'] = switchesToSave
            savingDictionary['controllers'] = controllersToSave

            # Save Links
            linksToSave = []
            for link in self.links.values():
                src = link['src']
                dst = link['dest']
                linkopts = link['linkOpts']

                srcName, dstName = src[ 'text' ], dst[ 'text' ]
                linkToSave = {'src':srcName,
                              'dest':dstName,
                              'opts':linkopts}
                if link['type'] == 'data':
                    linksToSave.append(linkToSave)
            savingDictionary['links'] = linksToSave

            # Save Application preferences
            savingDictionary['application'] = self.appPrefs

            try:
                with open(fileName, 'w') as f:
                    f.write(
                        json.dumps(savingDictionary,
                                   sort_keys=True,
                                   indent=4, separators=(',', ': ')))
            except Exception as er:  # pylint: disable=broad-except
                warn( er, '\n' )

    def exportScript( self ):
        "Export command."
        myFormats = [
            ('Mininet Custom Topology','*.py'),
            ('All Files','*'),
        ]

        fileName = tkFileDialog.asksaveasfilename(filetypes=myFormats ,title="Export the topology as...")
        if len(fileName ) > 0:
            # debug( "Now saving under %s\n" % fileName )
            f = open(fileName, 'w')  # pylint: disable=consider-using-with

            f.write("#!/usr/bin/env python\n")
            f.write("\n")
            f.write("from mininet.net import Mininet\n")
            f.write("from mininet.node import Controller, RemoteController, OVSController\n")
            f.write("from mininet.node import CPULimitedHost, Host, Node\n")
            f.write("from mininet.node import OVSKernelSwitch, UserSwitch\n")
            if StrictVersion(MININET_VERSION) > StrictVersion('2.0'):
                f.write("from mininet.node import IVSSwitch\n")
            f.write("from mininet.cli import CLI\n")
            f.write("from mininet.log import setLogLevel, info\n")
            f.write("from mininet.link import TCLink, Intf\n")
            f.write("from subprocess import call\n")

            inBandCtrl = False
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )

                if 'Controller' in tags:
                    opts = self.controllers[name]
                    controllerType = opts['controllerType']
                    if controllerType == 'inband':
                        inBandCtrl = True

            if inBandCtrl:
                f.write("\n")
                f.write("class InbandController( RemoteController ):\n")
                f.write("\n")
                f.write("    def checkListening( self ):\n")
                f.write("        \"Overridden to do nothing.\"\n")
                f.write("        return\n")

            f.write("\n")
            f.write("def myNetwork():\n")
            f.write("\n")
            f.write("    net = Mininet( topo=None,\n")
            if len(self.appPrefs['dpctl']) > 0:
                f.write("                   listenPort="+self.appPrefs['dpctl']+",\n")
            f.write("                   build=False,\n")
            f.write("                   ipBase='"+self.appPrefs['ipBase']+"')\n")
            f.write("\n")
            f.write("    info( '*** Adding controller\\n' )\n")
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )

                if 'Controller' in tags:
                    opts = self.controllers[name]
                    controllerType = opts['controllerType']
                    if 'controllerProtocol' in opts:
                        controllerProtocol = opts['controllerProtocol']
                    else:
                        controllerProtocol = 'tcp'
                    controllerIP = opts['remoteIP']
                    controllerPort = opts['remotePort']


                    f.write("    "+name+"=net.addController(name='"+name+"',\n")

                    if controllerType == 'remote':
                        f.write("                      controller=RemoteController,\n")
                        f.write("                      ip='"+controllerIP+"',\n")
                    elif controllerType == 'inband':
                        f.write("                      controller=InbandController,\n")
                        f.write("                      ip='"+controllerIP+"',\n")
                    elif controllerType == 'ovsc':
                        f.write("                      controller=OVSController,\n")
                    else:
                        f.write("                      controller=Controller,\n")

                    f.write("                      protocol='"+controllerProtocol+"',\n")
                    f.write("                      port="+str(controllerPort)+")\n")
                    f.write("\n")

            # Save Switches and Hosts
            f.write("    info( '*** Add switches\\n')\n")
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'LegacyRouter' in tags:
                    f.write("    "+name+" = net.addHost('"+name+"', cls=Node, ip='0.0.0.0')\n")
                    f.write("    "+name+".cmd('sysctl -w net.ipv4.ip_forward=1')\n")
                if 'LegacySwitch' in tags:
                    f.write("    "+name+" = net.addSwitch('"+name+"', cls=OVSKernelSwitch, failMode='standalone')\n")
                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    nodeNum = opts['nodeNum']
                    f.write("    "+name+" = net.addSwitch('"+name+"'")
                    if opts['switchType'] == 'default':
                        if self.appPrefs['switchType'] == 'ivs':
                            f.write(", cls=IVSSwitch")
                        elif self.appPrefs['switchType'] == 'user':
                            f.write(", cls=UserSwitch")
                        elif self.appPrefs['switchType'] == 'userns':
                            f.write(", cls=UserSwitch, inNamespace=True")
                        else:
                            f.write(", cls=OVSKernelSwitch")
                    elif opts['switchType'] == 'ivs':
                        f.write(", cls=IVSSwitch")
                    elif opts['switchType'] == 'user':
                        f.write(", cls=UserSwitch")
                    elif opts['switchType'] == 'userns':
                        f.write(", cls=UserSwitch, inNamespace=True")
                    else:
                        f.write(", cls=OVSKernelSwitch")
                    if 'dpctl' in opts:
                        f.write(", listenPort="+opts['dpctl'])
                    if 'dpid' in opts:
                        f.write(", dpid='"+opts['dpid']+"'")
                    f.write(")\n")
                    if 'externalInterfaces' in opts:
                        for extInterface in opts['externalInterfaces']:
                            f.write("    Intf( '"+extInterface+"', node="+name+" )\n")

            f.write("\n")
            f.write("    info( '*** Add hosts\\n')\n")
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'Host' in tags:
                    opts = self.hostOpts[name]
                    ip = None
                    defaultRoute = None
                    if 'defaultRoute' in opts and len(opts['defaultRoute']) > 0:
                        defaultRoute = "'via "+opts['defaultRoute']+"'"
                    else:
                        defaultRoute = 'None'
                    if 'ip' in opts and len(opts['ip']) > 0:
                        ip = opts['ip']
                    else:
                        nodeNum = self.hostOpts[name]['nodeNum']
                        ipBaseNum, prefixLen = netParse( self.appPrefs['ipBase'] )
                        ip = ipAdd(i=nodeNum, prefixLen=prefixLen, ipBaseNum=ipBaseNum)

                    if 'cores' in opts or 'cpu' in opts:
                        f.write("    "+name+" = net.addHost('"+name+"', cls=CPULimitedHost, ip='"+ip+"', defaultRoute="+defaultRoute+")\n")
                        if 'cores' in opts:
                            f.write("    "+name+".setCPUs(cores='"+opts['cores']+"')\n")
                        if 'cpu' in opts:
                            f.write("    "+name+".setCPUFrac(f="+str(opts['cpu'])+", sched='"+opts['sched']+"')\n")
                    else:
                        f.write("    "+name+" = net.addHost('"+name+"', cls=Host, ip='"+ip+"', defaultRoute="+defaultRoute+")\n")
                    if 'externalInterfaces' in opts:
                        for extInterface in opts['externalInterfaces']:
                            f.write("    Intf( '"+extInterface+"', node="+name+" )\n")
            f.write("\n")

            # Save Links
            f.write("    info( '*** Add links\\n')\n")
            for key,linkDetail in self.links.items():
                tags = self.canvas.gettags(key)
                if 'data' in tags:
                    optsExist = False
                    src = linkDetail['src']
                    dst = linkDetail['dest']
                    linkopts = linkDetail['linkOpts']
                    srcName, dstName = src[ 'text' ], dst[ 'text' ]
                    bw = ''
                    # delay = ''
                    # loss = ''
                    # max_queue_size = ''
                    linkOpts = "{"
                    if 'bw' in linkopts:
                        bw =  linkopts['bw']
                        linkOpts = linkOpts + "'bw':"+str(bw)
                        optsExist = True
                    if 'delay' in linkopts:
                        # delay =  linkopts['delay']
                        if optsExist:
                            linkOpts = linkOpts + ","
                        linkOpts = linkOpts + "'delay':'"+linkopts['delay']+"'"
                        optsExist = True
                    if 'loss' in linkopts:
                        if optsExist:
                            linkOpts = linkOpts + ","
                        linkOpts = linkOpts + "'loss':"+str(linkopts['loss'])
                        optsExist = True
                    if 'max_queue_size' in linkopts:
                        if optsExist:
                            linkOpts = linkOpts + ","
                        linkOpts = linkOpts + "'max_queue_size':"+str(linkopts['max_queue_size'])
                        optsExist = True
                    if 'jitter' in linkopts:
                        if optsExist:
                            linkOpts = linkOpts + ","
                        linkOpts = linkOpts + "'jitter':'"+linkopts['jitter']+"'"
                        optsExist = True
                    if 'speedup' in linkopts:
                        if optsExist:
                            linkOpts = linkOpts + ","
                        linkOpts = linkOpts + "'speedup':"+str(linkopts['speedup'])
                        optsExist = True

                    linkOpts = linkOpts + "}"
                    if optsExist:
                        f.write("    "+srcName+dstName+" = "+linkOpts+"\n")
                    f.write("    net.addLink("+srcName+", "+dstName)
                    if optsExist:
                        f.write(", cls=TCLink , **"+srcName+dstName)
                    f.write(")\n")

            f.write("\n")
            f.write("    info( '*** Starting network\\n')\n")
            f.write("    net.build()\n")

            f.write("    info( '*** Starting controllers\\n')\n")
            f.write("    for controller in net.controllers:\n")
            f.write("        controller.start()\n")
            f.write("\n")

            f.write("    info( '*** Starting switches\\n')\n")
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'Switch' in tags or 'LegacySwitch' in tags:
                    opts = self.switchOpts[name]
                    ctrlList = ",".join(opts['controllers'])
                    f.write("    net.get('"+name+"').start(["+ctrlList+"])\n")

            f.write("\n")

            f.write("    info( '*** Post configure switches and hosts\\n')\n")
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    if opts['switchType'] == 'default':
                        if self.appPrefs['switchType'] == 'user':
                            if 'switchIP' in opts:
                                if len(opts['switchIP']) > 0:
                                    f.write("    "+name+".cmd('ifconfig "+name+" "+opts['switchIP']+"')\n")
                        elif self.appPrefs['switchType'] == 'userns':
                            if 'switchIP' in opts:
                                if len(opts['switchIP']) > 0:
                                    f.write("    "+name+".cmd('ifconfig lo "+opts['switchIP']+"')\n")
                        elif self.appPrefs['switchType'] == 'ovs':
                            if 'switchIP' in opts:
                                if len(opts['switchIP']) > 0:
                                    f.write("    "+name+".cmd('ifconfig "+name+" "+opts['switchIP']+"')\n")
                    elif opts['switchType'] == 'user':
                        if 'switchIP' in opts:
                            if len(opts['switchIP']) > 0:
                                f.write("    "+name+".cmd('ifconfig "+name+" "+opts['switchIP']+"')\n")
                    elif opts['switchType'] == 'userns':
                        if 'switchIP' in opts:
                            if len(opts['switchIP']) > 0:
                                f.write("    "+name+".cmd('ifconfig lo "+opts['switchIP']+"')\n")
                    elif opts['switchType'] == 'ovs':
                        if 'switchIP' in opts:
                            if len(opts['switchIP']) > 0:
                                f.write("    "+name+".cmd('ifconfig "+name+" "+opts['switchIP']+"')\n")
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'Host' in tags:
                    opts = self.hostOpts[name]
                    # Attach vlan interfaces
                    if 'vlanInterfaces' in opts:
                        for vlanInterface in opts['vlanInterfaces']:
                            f.write("    "+name+".cmd('vconfig add "+name+"-eth0 "+vlanInterface[1]+"')\n")
                            f.write("    "+name+".cmd('ifconfig "+name+"-eth0."+vlanInterface[1]+" "+vlanInterface[0]+"')\n")
                    # Run User Defined Start Command
                    if 'startCommand' in opts:
                        f.write("    "+name+".cmdPrint('"+opts['startCommand']+"')\n")
                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    # Run User Defined Start Command
                    if 'startCommand' in opts:
                        f.write("    "+name+".cmdPrint('"+opts['startCommand']+"')\n")

            # Configure NetFlow
            nflowValues = self.appPrefs['netflow']
            if len(nflowValues['nflowTarget']) > 0:
                nflowEnabled = False
                nflowSwitches = ''
                for widget, item in self.widgetToItem.items():
                    name = widget[ 'text' ]
                    tags = self.canvas.gettags( item )

                    if 'Switch' in tags:
                        opts = self.switchOpts[name]
                        if 'netflow' in opts:
                            if opts['netflow'] == '1':
                                nflowSwitches = nflowSwitches+' -- set Bridge '+name+' netflow=@MiniEditNF'
                                nflowEnabled=True
                if nflowEnabled:
                    nflowCmd = 'ovs-vsctl -- --id=@MiniEditNF create NetFlow '+ 'target=\\\"'+nflowValues['nflowTarget']+'\\\" '+ 'active-timeout='+nflowValues['nflowTimeout']
                    if nflowValues['nflowAddId'] == '1':
                        nflowCmd = nflowCmd + ' add_id_to_interface=true'
                    else:
                        nflowCmd = nflowCmd + ' add_id_to_interface=false'
                    f.write("    \n")
                    f.write("    call('"+nflowCmd+nflowSwitches+"', shell=True)\n")

            # Configure sFlow
            sflowValues = self.appPrefs['sflow']
            if len(sflowValues['sflowTarget']) > 0:
                sflowEnabled = False
                sflowSwitches = ''
                for widget, item in self.widgetToItem.items():
                    name = widget[ 'text' ]
                    tags = self.canvas.gettags( item )

                    if 'Switch' in tags:
                        opts = self.switchOpts[name]
                        if 'sflow' in opts:
                            if opts['sflow'] == '1':
                                sflowSwitches = sflowSwitches+' -- set Bridge '+name+' sflow=@MiniEditSF'
                                sflowEnabled=True
                if sflowEnabled:
                    sflowCmd = 'ovs-vsctl -- --id=@MiniEditSF create sFlow '+ 'target=\\\"'+sflowValues['sflowTarget']+'\\\" '+ 'header='+sflowValues['sflowHeader']+' '+ 'sampling='+sflowValues['sflowSampling']+' '+ 'polling='+sflowValues['sflowPolling']
                    f.write("    \n")
                    f.write("    call('"+sflowCmd+sflowSwitches+"', shell=True)\n")

            f.write("\n")
            f.write("    CLI(net)\n")
            for widget, item in self.widgetToItem:
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'Host' in tags:
                    opts = self.hostOpts[name]
                    # Run User Defined Stop Command
                    if 'stopCommand' in opts:
                        f.write("    "+name+".cmdPrint('"+opts['stopCommand']+"')\n")
                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    # Run User Defined Stop Command
                    if 'stopCommand' in opts:
                        f.write("    "+name+".cmdPrint('"+opts['stopCommand']+"')\n")

            f.write("    net.stop()\n")
            f.write("\n")
            f.write("if __name__ == '__main__':\n")
            f.write("    setLogLevel( 'info' )\n")
            f.write("    myNetwork()\n")
            f.write("\n")


            f.close()


    # Generic canvas handler
    #
    # We could have used bindtags, as in nodeIcon, but
    # the dynamic approach used here
    # may actually require less code. In any case, it's an
    # interesting introspection-based alternative to bindtags.

    def canvasHandle( self, eventName, event ):
        "Generic canvas event handler"
        if self.active is None:
            return
        toolName = self.active
        handler = getattr( self, eventName + toolName, None )
        if handler is not None:
            handler( event )

    def clickCanvas( self, event ):
        "Canvas click handler."
        self.canvasHandle( 'click', event )

    def dragCanvas( self, event ):
        "Canvas drag handler."
        self.canvasHandle( 'drag', event )

    def releaseCanvas( self, event ):
        "Canvas mouse up handler."
        self.canvasHandle( 'release', event )

    # Currently the only items we can select directly are
    # links. Nodes are handled by bindings in the node icon.

    def findItem( self, x, y ):
        "Find items at a location in our canvas."
        items = self.canvas.find_overlapping( x, y, x, y )
        if len( items ) == 0:
            return None
        else:
            return items[ 0 ]

    # Canvas bindings for Select, Host, Switch and Link tools

    def clickSelect( self, event ):
        "Select an item."
        self.selectItem( self.findItem( event.x, event.y ) )

    def deleteItem( self, item ):
        "Delete an item."
        # Don't delete while network is running
        if self.buttons[ 'Select' ][ 'state' ] == 'disabled':
            return
        # Delete from model
        if item in self.links:
            self.deleteLink( item )
        if item in self.itemToWidget:
            self.deleteNode( item )
        # Delete from view
        self.canvas.delete( item )

    def deleteSelection( self, _event ):
        "Delete the selected item."
        if self.selection is not None:
            self.deleteItem( self.selection )
        self.selectItem( None )

    def nodeIcon( self, node, name ):
        "Create a new node icon."
        icon = Button( self.canvas, image=self.images[ node ],
                       text=name, compound='top' )
        # Unfortunately bindtags wants a tuple
        bindtags = [ str( self.nodeBindings ) ]
        bindtags += list( icon.bindtags() )
        icon.bindtags( tuple( bindtags ) )
        return icon

    def newNode( self, node, event ):
        "Add a new node to our canvas."
        c = self.canvas
        x, y = c.canvasx( event.x ), c.canvasy( event.y )
        name = self.nodePrefixes[ node ]
        if node == 'Switch':
            self.switchCount += 1
            name = self.nodePrefixes[ node ] + str( self.switchCount )
            self.switchOpts[name] = {}
            self.switchOpts[name]['nodeNum']=self.switchCount
            self.switchOpts[name]['hostname']=name
            self.switchOpts[name]['switchType']='default'
            self.switchOpts[name]['controllers']=[]
        if node == 'LegacyRouter':
            self.switchCount += 1
            name = self.nodePrefixes[ node ] + str( self.switchCount )
            self.switchOpts[name] = {}
            self.switchOpts[name]['nodeNum']=self.switchCount
            self.switchOpts[name]['hostname']=name
            self.switchOpts[name]['switchType']='legacyRouter'
        if node == 'LegacySwitch':
            self.switchCount += 1
            name = self.nodePrefixes[ node ] + str( self.switchCount )
            self.switchOpts[name] = {}
            self.switchOpts[name]['nodeNum']=self.switchCount
            self.switchOpts[name]['hostname']=name
            self.switchOpts[name]['switchType']='legacySwitch'
            self.switchOpts[name]['controllers']=[]
        if node == 'Host':
            self.hostCount += 1
            name = self.nodePrefixes[ node ] + str( self.hostCount )
            self.hostOpts[name] = {'sched':'host'}
            self.hostOpts[name]['nodeNum']=self.hostCount
            self.hostOpts[name]['hostname']=name
        if node == 'Controller':
            name = self.nodePrefixes[ node ] + str( self.controllerCount )
            ctrlr = { 'controllerType': 'ref',
                      'hostname': name,
                      'controllerProtocol': 'tcp',
                      'remoteIP': '127.0.0.1',
                      'remotePort': 6633}
            self.controllers[name] = ctrlr
            # We want to start controller count at 0
            self.controllerCount += 1

        icon = self.nodeIcon( node, name )
        item = self.canvas.create_window( x, y, anchor='c', window=icon,
                                          tags=node )
        self.widgetToItem[ icon ] = item
        self.itemToWidget[ item ] = icon
        self.selectItem( item )
        icon.links = {}
        if node == 'Switch':
            icon.bind('<Button-3>', self.do_switchPopup )
        if node == 'LegacyRouter':
            icon.bind('<Button-3>', self.do_legacyRouterPopup )
        if node == 'LegacySwitch':
            icon.bind('<Button-3>', self.do_legacySwitchPopup )
        if node == 'Host':
            icon.bind('<Button-3>', self.do_hostPopup )
        if node == 'Controller':
            icon.bind('<Button-3>', self.do_controllerPopup )

    def clickController( self, event ):
        "Add a new Controller to our canvas."
        self.newNode( 'Controller', event )

    def clickHost( self, event ):
        "Add a new host to our canvas."
        self.newNode( 'Host', event )

    def clickLegacyRouter( self, event ):
        "Add a new switch to our canvas."
        self.newNode( 'LegacyRouter', event )

    def clickLegacySwitch( self, event ):
        "Add a new switch to our canvas."
        self.newNode( 'LegacySwitch', event )

    def clickSwitch( self, event ):
        "Add a new switch to our canvas."
        self.newNode( 'Switch', event )

    def dragNetLink( self, event ):
        "Drag a link's endpoint to another node."
        if self.link is None:
            return
        # Since drag starts in widget, we use root coords
        x = self.canvasx( event.x_root )
        y = self.canvasy( event.y_root )
        c = self.canvas
        c.coords( self.link, self.linkx, self.linky, x, y )

    def releaseNetLink( self, _event ):
        "Give up on the current link."
        if self.link is not None:
            self.canvas.delete( self.link )
        self.linkWidget = self.linkItem = self.link = None

    # Generic node handlers

    def createNodeBindings( self ):
        "Create a set of bindings for nodes."
        bindings = {
            '<ButtonPress-1>': self.clickNode,
            '<B1-Motion>': self.dragNode,
            '<ButtonRelease-1>': self.releaseNode,
            '<Enter>': self.enterNode,
            '<Leave>': self.leaveNode
        }
        l = Label()  # lightweight-ish owner for bindings
        for event, binding in bindings.items():
            l.bind( event, binding )
        return l

    def selectItem( self, item ):
        "Select an item and remember old selection."
        self.lastSelection = self.selection
        self.selection = item

    def enterNode( self, event ):
        "Select node on entry."
        self.selectNode( event )

    def leaveNode( self, _event ):
        "Restore old selection on exit."
        self.selectItem( self.lastSelection )

    def clickNode( self, event ):
        "Node click handler."
        if self.active == 'NetLink':
            self.startLink( event )
        else:
            self.selectNode( event )
        return 'break'

    def dragNode( self, event ):
        "Node drag handler."
        if self.active == 'NetLink':
            self.dragNetLink( event )
        else:
            self.dragNodeAround( event )

    def releaseNode( self, event ):
        "Node release handler."
        if self.active == 'NetLink':
            self.finishLink( event )

    # Specific node handlers

    def selectNode( self, event ):
        "Select the node that was clicked on."
        item = self.widgetToItem.get( event.widget, None )
        self.selectItem( item )

    def dragNodeAround( self, event ):
        "Drag a node around on the canvas."
        c = self.canvas
        # Convert global to local coordinates;
        # Necessary since x, y are widget-relative
        x = self.canvasx( event.x_root )
        y = self.canvasy( event.y_root )
        w = event.widget
        # Adjust node position
        item = self.widgetToItem[ w ]
        c.coords( item, x, y )
        # Adjust link positions
        for dest in w.links:
            link = w.links[ dest ]
            item = self.widgetToItem[ dest ]
            x1, y1 = c.coords( item )
            c.coords( link, x, y, x1, y1 )
        self.updateScrollRegion()

    def createControlLinkBindings( self ):
        "Create a set of bindings for nodes."
        # Link bindings
        # Selection still needs a bit of work overall
        # Callbacks ignore event

        def select( _event, link=self.link ):
            "Select item on mouse entry."
            self.selectItem( link )

        def highlight( _event, link=self.link ):
            "Highlight item on mouse entry."
            self.selectItem( link )
            self.canvas.itemconfig( link, fill='green' )

        def unhighlight( _event, link=self.link ):
            "Unhighlight item on mouse exit."
            self.canvas.itemconfig( link, fill='red' )
            #self.selectItem( None )

        self.canvas.tag_bind( self.link, '<Enter>', highlight )
        self.canvas.tag_bind( self.link, '<Leave>', unhighlight )
        self.canvas.tag_bind( self.link, '<ButtonPress-1>', select )

    def createDataLinkBindings( self ):
        "Create a set of bindings for nodes."
        # Link bindings
        # Selection still needs a bit of work overall
        # Callbacks ignore event

        def select( _event, link=self.link ):
            "Select item on mouse entry."
            self.selectItem( link )

        def highlight( _event, link=self.link ):
            "Highlight item on mouse entry."
            self.selectItem( link )
            self.canvas.itemconfig( link, fill='green' )

        def unhighlight( _event, link=self.link ):
            "Unhighlight item on mouse exit."
            self.canvas.itemconfig( link, fill='blue' )
            #self.selectItem( None )

        self.canvas.tag_bind( self.link, '<Enter>', highlight )
        self.canvas.tag_bind( self.link, '<Leave>', unhighlight )
        self.canvas.tag_bind( self.link, '<ButtonPress-1>', select )
        self.canvas.tag_bind( self.link, '<Button-3>', self.do_linkPopup )


    def startLink( self, event ):
        "Start a new link."
        if event.widget not in self.widgetToItem:
            # Didn't click on a node
            return

        w = event.widget
        item = self.widgetToItem[ w ]
        x, y = self.canvas.coords( item )
        self.link = self.canvas.create_line( x, y, x, y, width=4,
                                             fill='blue', tag='link' )
        self.linkx, self.linky = x, y
        self.linkWidget = w
        self.linkItem = item


    def finishLink( self, event ):
        "Finish creating a link"
        if self.link is None:
            return
        source = self.linkWidget
        c = self.canvas
        # Since we dragged from the widget, use root coords
        x, y = self.canvasx( event.x_root ), self.canvasy( event.y_root )
        target = self.findItem( x, y )
        dest = self.itemToWidget.get( target, None )
        if ( source is None or dest is None or source == dest
                or dest in source.links or source in dest.links ):
            self.releaseNetLink( event )
            return
        # For now, don't allow hosts to be directly linked
        stags = self.canvas.gettags( self.widgetToItem[ source ] )
        dtags = self.canvas.gettags( target )
        # TODO: Make this less confusing
        # pylint: disable=too-many-boolean-expressions
        if (('Host' in stags and 'Host' in dtags) or
           ('Controller' in dtags and 'LegacyRouter' in stags) or
           ('Controller' in stags and 'LegacyRouter' in dtags) or
           ('Controller' in dtags and 'LegacySwitch' in stags) or
           ('Controller' in stags and 'LegacySwitch' in dtags) or
           ('Controller' in dtags and 'Host' in stags) or
           ('Controller' in stags and 'Host' in dtags) or
           ('Controller' in stags and 'Controller' in dtags)):
            self.releaseNetLink( event )
            return

        # Set link type
        linkType='data'
        if 'Controller' in stags or 'Controller' in dtags:
            linkType='control'
            c.itemconfig(self.link, dash=(6, 4, 2, 4), fill='red')
            self.createControlLinkBindings()
        else:
            linkType='data'
            self.createDataLinkBindings()
        c.itemconfig(self.link, tags=c.gettags(self.link)+(linkType,))

        x, y = c.coords( target )
        c.coords( self.link, self.linkx, self.linky, x, y )
        self.addLink( source, dest, linktype=linkType )
        if linkType == 'control':
            controllerName = ''
            switchName = ''
            if 'Controller' in stags:
                controllerName = source[ 'text' ]
                switchName = dest[ 'text' ]
            else:
                controllerName = dest[ 'text' ]
                switchName = source[ 'text' ]

            self.switchOpts[switchName]['controllers'].append(controllerName)

        # We're done
        self.link = self.linkWidget = None

    # Menu handlers

    def about( self ):
        "Display about box."
        about = self.aboutBox
        if about is None:
            bg = 'white'
            about = Toplevel( bg='white' )
            about.title( 'About' )
            desc = self.appName + ': a simple network editor for MiniNet'
            version = 'MiniEdit '+MINIEDIT_VERSION
            author = 'Originally by: Bob Lantz <rlantz@cs>, April 2010'
            enhancements = 'Enhancements by: Gregory Gee, Since July 2013'
            www = 'http://gregorygee.wordpress.com/category/miniedit/'
            line1 = Label( about, text=desc, font='Helvetica 10 bold', bg=bg )
            line2 = Label( about, text=version, font='Helvetica 9', bg=bg )
            line3 = Label( about, text=author, font='Helvetica 9', bg=bg )
            line4 = Label( about, text=enhancements, font='Helvetica 9', bg=bg )
            line5 = Entry( about, font='Helvetica 9', bg=bg, width=len(www), justify=CENTER )
            line5.insert(0, www)
            line5.configure(state='readonly')
            line1.pack( padx=20, pady=10 )
            line2.pack(pady=10 )
            line3.pack(pady=10 )
            line4.pack(pady=10 )
            line5.pack(pady=10 )
            def hide():
                about.withdraw()
            self.aboutBox = about
            # Hide on close rather than destroying window
            Wm.wm_protocol( about, name='WM_DELETE_WINDOW', func=hide )
        # Show (existing) window
        about.deiconify()

    def createToolImages( self ):
        "Create toolbar (and icon) images."

    @staticmethod
    def checkIntf( intf ):
        "Make sure intf exists and is not configured."
        if ( ' %s:' % intf ) not in quietRun( 'ip link show' ):
            showerror(title="Error",
                      message='External interface ' +intf + ' does not exist! Skipping.')
            return False
        ips = re.findall( r'\d+\.\d+\.\d+\.\d+', quietRun( 'ifconfig ' + intf ) )
        if ips:
            showerror(title="Error",
                      message= intf + ' has an IP address and is probably in use! Skipping.' )
            return False
        return True

    def hostDetails( self, _ignore=None ):
        if ( self.selection is None or
             self.net is not None or
             self.selection not in self.itemToWidget ):
            return
        widget = self.itemToWidget[ self.selection ]
        name = widget[ 'text' ]
        tags = self.canvas.gettags( self.selection )
        if 'Host' not in tags:
            return

        prefDefaults = self.hostOpts[name]
        hostBox = HostDialog(self, title='Host Details', prefDefaults=prefDefaults)
        self.master.wait_window(hostBox.top)
        if hostBox.result:
            newHostOpts = {'nodeNum':self.hostOpts[name]['nodeNum']}
            newHostOpts['sched'] = hostBox.result['sched']
            if len(hostBox.result['startCommand']) > 0:
                newHostOpts['startCommand'] = hostBox.result['startCommand']
            if len(hostBox.result['stopCommand']) > 0:
                newHostOpts['stopCommand'] = hostBox.result['stopCommand']
            if len(hostBox.result['cpu']) > 0:
                newHostOpts['cpu'] = float(hostBox.result['cpu'])
            if len(hostBox.result['cores']) > 0:
                newHostOpts['cores'] = hostBox.result['cores']
            if len(hostBox.result['hostname']) > 0:
                newHostOpts['hostname'] = hostBox.result['hostname']
                name = hostBox.result['hostname']
                widget[ 'text' ] = name
            if len(hostBox.result['defaultRoute']) > 0:
                newHostOpts['defaultRoute'] = hostBox.result['defaultRoute']
            if len(hostBox.result['ip']) > 0:
                newHostOpts['ip'] = hostBox.result['ip']
            if len(hostBox.result['externalInterfaces']) > 0:
                newHostOpts['externalInterfaces'] = hostBox.result['externalInterfaces']
            if len(hostBox.result['vlanInterfaces']) > 0:
                newHostOpts['vlanInterfaces'] = hostBox.result['vlanInterfaces']
            if len(hostBox.result['privateDirectory']) > 0:
                newHostOpts['privateDirectory'] = hostBox.result['privateDirectory']
            self.hostOpts[name] = newHostOpts
            info( 'New host details for ' + name + ' = ' + str(newHostOpts), '\n' )

    def switchDetails( self, _ignore=None ):
        if ( self.selection is None or
             self.net is not None or
             self.selection not in self.itemToWidget ):
            return
        widget = self.itemToWidget[ self.selection ]
        name = widget[ 'text' ]
        tags = self.canvas.gettags( self.selection )
        if 'Switch' not in tags:
            return

        prefDefaults = self.switchOpts[name]
        switchBox = SwitchDialog(self, title='Switch Details', prefDefaults=prefDefaults)
        self.master.wait_window(switchBox.top)
        if switchBox.result:
            newSwitchOpts = {'nodeNum':self.switchOpts[name]['nodeNum']}
            newSwitchOpts['switchType'] = switchBox.result['switchType']
            newSwitchOpts['controllers'] = self.switchOpts[name]['controllers']
            if len(switchBox.result['startCommand']) > 0:
                newSwitchOpts['startCommand'] = switchBox.result['startCommand']
            if len(switchBox.result['stopCommand']) > 0:
                newSwitchOpts['stopCommand'] = switchBox.result['stopCommand']
            if len(switchBox.result['dpctl']) > 0:
                newSwitchOpts['dpctl'] = switchBox.result['dpctl']
            if len(switchBox.result['dpid']) > 0:
                newSwitchOpts['dpid'] = switchBox.result['dpid']
            if len(switchBox.result['hostname']) > 0:
                newSwitchOpts['hostname'] = switchBox.result['hostname']
                name = switchBox.result['hostname']
                widget[ 'text' ] = name
            if len(switchBox.result['externalInterfaces']) > 0:
                newSwitchOpts['externalInterfaces'] = switchBox.result['externalInterfaces']
            newSwitchOpts['switchIP'] = switchBox.result['switchIP']
            newSwitchOpts['sflow'] = switchBox.result['sflow']
            newSwitchOpts['netflow'] = switchBox.result['netflow']
            self.switchOpts[name] = newSwitchOpts
            info( 'New switch details for ' + name + ' = ' + str(newSwitchOpts), '\n' )

    def linkUp( self ):
        if ( self.selection is None or
             self.net is None):
            return
        link = self.selection
        linkDetail =  self.links[link]
        src = linkDetail['src']
        dst = linkDetail['dest']
        srcName, dstName = src[ 'text' ], dst[ 'text' ]
        self.net.configLinkStatus(srcName, dstName, 'up')
        self.canvas.itemconfig(link, dash=())

    def linkDown( self ):
        if ( self.selection is None or
             self.net is None):
            return
        link = self.selection
        linkDetail =  self.links[link]
        src = linkDetail['src']
        dst = linkDetail['dest']
        srcName, dstName = src[ 'text' ], dst[ 'text' ]
        self.net.configLinkStatus(srcName, dstName, 'down')
        self.canvas.itemconfig(link, dash=(4, 4))

    def linkDetails( self, _ignore=None ):
        if ( self.selection is None or
             self.net is not None):
            return
        link = self.selection

        linkDetail =  self.links[link]
        # src = linkDetail['src']
        # dest = linkDetail['dest']
        linkopts = linkDetail['linkOpts']
        linkBox = LinkDialog(self, title='Link Details', linkDefaults=linkopts)
        if linkBox.result is not None:
            linkDetail['linkOpts'] = linkBox.result
            info( 'New link details = ' + str(linkBox.result), '\n' )

    def prefDetails( self ):
        prefDefaults = self.appPrefs
        prefBox = PrefsDialog(self, title='Preferences', prefDefaults=prefDefaults)
        info( 'New Prefs = ' + str(prefBox.result), '\n' )
        if prefBox.result:
            self.appPrefs = prefBox.result


    def controllerDetails( self ):
        if ( self.selection is None or
             self.net is not None or
             self.selection not in self.itemToWidget ):
            return
        widget = self.itemToWidget[ self.selection ]
        name = widget[ 'text' ]
        tags = self.canvas.gettags( self.selection )
        oldName = name
        if 'Controller' not in tags:
            return

        ctrlrBox = ControllerDialog(self, title='Controller Details', ctrlrDefaults=self.controllers[name])
        if ctrlrBox.result:
            # debug( 'Controller is ' + ctrlrBox.result[0], '\n' )
            if len(ctrlrBox.result['hostname']) > 0:
                name = ctrlrBox.result['hostname']
                widget[ 'text' ] = name
            else:
                ctrlrBox.result['hostname'] = name
            self.controllers[name] = ctrlrBox.result
            info( 'New controller details for ' + name + ' = ' + str(self.controllers[name]), '\n' )
            # Find references to controller and change name
            if oldName != name:
                for widget, item in self.widgetToItem.items():
                    switchName = widget[ 'text' ]
                    tags = self.canvas.gettags( item )
                    if 'Switch' in tags:
                        switch = self.switchOpts[switchName]
                        if oldName in switch['controllers']:
                            switch['controllers'].remove(oldName)
                            switch['controllers'].append(name)


    def listBridge( self, _ignore=None ):
        if ( self.selection is None or
             self.net is None or
             self.selection not in self.itemToWidget ):
            return
        name = self.itemToWidget[ self.selection ][ 'text' ]
        tags = self.canvas.gettags( self.selection )

        if name not in self.net.nameToNode:
            return
        if 'Switch' in tags or 'LegacySwitch' in tags:
            call(["xterm -T 'Bridge Details' -sb -sl 2000 -e 'ovs-vsctl list bridge " + name + "; read -p \"Press Enter to close\"' &"], shell=True)

    @staticmethod
    def ovsShow( _ignore=None ):
        call(["xterm -T 'OVS Summary' -sb -sl 2000 -e 'ovs-vsctl show; read -p \"Press Enter to close\"' &"], shell=True)

    @staticmethod
    def rootTerminal( _ignore=None ):
        call(["xterm -T 'Root Terminal' -sb -sl 2000 &"], shell=True)

    # Model interface
    #
    # Ultimately we will either want to use a topo or
    # mininet object here, probably.

    def addLink( self, source, dest, linktype='data', linkopts=None ):
        "Add link to model."
        if linkopts is None:
            linkopts = {}
        source.links[ dest ] = self.link
        dest.links[ source ] = self.link
        self.links[ self.link ] = {'type':linktype,
                                   'src':source,
                                   'dest':dest,
                                   'linkOpts':linkopts}

    def deleteLink( self, link ):
        "Delete link from model."
        pair = self.links.get( link, None )
        if pair is not None:
            source=pair['src']
            dest=pair['dest']
            del source.links[ dest ]
            del dest.links[ source ]
            stags = self.canvas.gettags( self.widgetToItem[ source ] )
            # dtags = self.canvas.gettags( self.widgetToItem[ dest ] )
            ltags = self.canvas.gettags( link )

            if 'control' in ltags:
                controllerName = ''
                switchName = ''
                if 'Controller' in stags:
                    controllerName = source[ 'text' ]
                    switchName = dest[ 'text' ]
                else:
                    controllerName = dest[ 'text' ]
                    switchName = source[ 'text' ]

                if controllerName in self.switchOpts[switchName]['controllers']:
                    self.switchOpts[switchName]['controllers'].remove(controllerName)


        if link is not None:
            del self.links[ link ]

    def deleteNode( self, item ):
        "Delete node (and its links) from model."

        widget = self.itemToWidget[ item ]
        tags = self.canvas.gettags(item)
        if 'Controller' in tags:
            # remove from switch controller lists
            for searchwidget, searchitem in self.widgetToItem.items():
                name = searchwidget[ 'text' ]
                tags = self.canvas.gettags( searchitem )
                if 'Switch' in tags:
                    if widget['text'] in self.switchOpts[name]['controllers']:
                        self.switchOpts[name]['controllers'].remove(widget['text'])
        for link in tuple( widget.links.values() ):
            # Delete from view and model
            self.deleteItem( link )
        del self.itemToWidget[ item ]
        del self.widgetToItem[ widget ]

    def buildNodes( self, net):
        # Make nodes
        info( "Getting Hosts and Switches.\n" )
        for widget, item in self.widgetToItem.items():
            name = widget[ 'text' ]
            tags = self.canvas.gettags( item )
            # debug( name+' has '+str(tags), '\n' )

            if 'Switch' in tags:
                opts = self.switchOpts[name]
                # debug( str(opts), '\n' )

                # Create the correct switch class
                switchClass = customOvs
                switchParms={}
                if 'dpctl' in opts:
                    switchParms['listenPort']=int(opts['dpctl'])
                if 'dpid' in opts:
                    switchParms['dpid']=opts['dpid']
                if opts['switchType'] == 'default':
                    if self.appPrefs['switchType'] == 'ivs':
                        switchClass = IVSSwitch
                    elif self.appPrefs['switchType'] == 'user':
                        switchClass = CustomUserSwitch
                    elif self.appPrefs['switchType'] == 'userns':
                        switchParms['inNamespace'] = True
                        switchClass = CustomUserSwitch
                    else:
                        switchClass = customOvs
                elif opts['switchType'] == 'user':
                    switchClass = CustomUserSwitch
                elif opts['switchType'] == 'userns':
                    switchClass = CustomUserSwitch
                    switchParms['inNamespace'] = True
                elif opts['switchType'] == 'ivs':
                    switchClass = IVSSwitch
                else:
                    switchClass = customOvs

                if switchClass == customOvs:
                    # Set OpenFlow versions
                    self.openFlowVersions = []
                    if self.appPrefs['openFlowVersions']['ovsOf10'] == '1':
                        self.openFlowVersions.append('OpenFlow10')
                    if self.appPrefs['openFlowVersions']['ovsOf11'] == '1':
                        self.openFlowVersions.append('OpenFlow11')
                    if self.appPrefs['openFlowVersions']['ovsOf12'] == '1':
                        self.openFlowVersions.append('OpenFlow12')
                    if self.appPrefs['openFlowVersions']['ovsOf13'] == '1':
                        self.openFlowVersions.append('OpenFlow13')
                    protoList = ",".join(self.openFlowVersions)
                    switchParms['protocols'] = protoList
                newSwitch = net.addSwitch( name , cls=switchClass, **switchParms)

                # Some post startup config
                if switchClass == CustomUserSwitch:
                    if 'switchIP' in opts:
                        if len(opts['switchIP']) > 0:
                            newSwitch.setSwitchIP(opts['switchIP'])
                if switchClass == customOvs:
                    if 'switchIP' in opts:
                        if len(opts['switchIP']) > 0:
                            newSwitch.setSwitchIP(opts['switchIP'])

                # Attach external interfaces
                if 'externalInterfaces' in opts:
                    for extInterface in opts['externalInterfaces']:
                        if self.checkIntf(extInterface):
                            Intf( extInterface, node=newSwitch )

            elif 'LegacySwitch' in tags:
                newSwitch = net.addSwitch( name , cls=LegacySwitch)
            elif 'LegacyRouter' in tags:
                newSwitch = net.addHost( name , cls=LegacyRouter)
            elif 'Host' in tags:
                opts = self.hostOpts[name]
                # debug( str(opts), '\n' )
                ip = None
                defaultRoute = None
                if 'defaultRoute' in opts and len(opts['defaultRoute']) > 0:
                    defaultRoute = 'via '+opts['defaultRoute']
                if 'ip' in opts and len(opts['ip']) > 0:
                    ip = opts['ip']
                else:
                    nodeNum = self.hostOpts[name]['nodeNum']
                    ipBaseNum, prefixLen = netParse( self.appPrefs['ipBase'] )
                    ip = ipAdd(i=nodeNum, prefixLen=prefixLen, ipBaseNum=ipBaseNum)

                # Create the correct host class
                if 'cores' in opts or 'cpu' in opts:
                    if 'privateDirectory' in opts:
                        hostCls = partial( CPULimitedHost,
                                           privateDirs=opts['privateDirectory'] )
                    else:
                        hostCls=CPULimitedHost
                else:
                    if 'privateDirectory' in opts:
                        hostCls = partial( Host,
                                           privateDirs=opts['privateDirectory'] )
                    else:
                        hostCls=Host
                debug( hostCls, '\n' )
                newHost = net.addHost( name,
                                       cls=hostCls,
                                       ip=ip,
                                       defaultRoute=defaultRoute
                                      )

                # Set the CPULimitedHost specific options
                if 'cores' in opts:
                    newHost.setCPUs(cores = opts['cores'])
                if 'cpu' in opts:
                    newHost.setCPUFrac(f=opts['cpu'], sched=opts['sched'])

                # Attach external interfaces
                if 'externalInterfaces' in opts:
                    for extInterface in opts['externalInterfaces']:
                        if self.checkIntf(extInterface):
                            Intf( extInterface, node=newHost )
                if 'vlanInterfaces' in opts:
                    if len(opts['vlanInterfaces']) > 0:
                        info( 'Checking that OS is VLAN prepared\n' )
                        self.pathCheck('vconfig', moduleName='vlan package')
                        moduleDeps( add='8021q' )
            elif 'Controller' in tags:
                opts = self.controllers[name]

                # Get controller info from panel
                controllerType = opts['controllerType']
                if 'controllerProtocol' in opts:
                    controllerProtocol = opts['controllerProtocol']
                else:
                    controllerProtocol = 'tcp'
                    opts['controllerProtocol'] = 'tcp'
                controllerIP = opts['remoteIP']
                controllerPort = opts['remotePort']

                # Make controller
                info( 'Getting controller selection:'+controllerType, '\n' )
                if controllerType == 'remote':
                    net.addController(name=name,
                                      controller=RemoteController,
                                      ip=controllerIP,
                                      protocol=controllerProtocol,
                                      port=controllerPort)
                elif controllerType == 'inband':
                    net.addController(name=name,
                                      controller=InbandController,
                                      ip=controllerIP,
                                      protocol=controllerProtocol,
                                      port=controllerPort)
                elif controllerType == 'ovsc':
                    net.addController(name=name,
                                      controller=OVSController,
                                      protocol=controllerProtocol,
                                      port=controllerPort)
                else:
                    net.addController(name=name,
                                      controller=Controller,
                                      protocol=controllerProtocol,
                                      port=controllerPort)

            else:
                raise Exception( "Cannot create mystery node: " + name )

    @staticmethod
    def pathCheck( *args, **kwargs ):
        "Make sure each program in *args can be found in $PATH."
        moduleName = kwargs.get( 'moduleName', 'it' )
        for arg in args:
            if not quietRun( 'which ' + arg ):
                showerror(title="Error",
                      message= 'Cannot find required executable %s.\n' % arg +
                       'Please make sure that %s is installed ' % moduleName +
                       'and available in your $PATH.' )

    def buildLinks( self, net):
        # Make links
        info( "Getting Links.\n" )
        for key,link in self.links.items():
            tags = self.canvas.gettags(key)
            if 'data' in tags:
                src=link['src']
                dst=link['dest']
                linkopts=link['linkOpts']
                srcName, dstName = src[ 'text' ], dst[ 'text' ]
                srcNode, dstNode = net.nameToNode[ srcName ], net.nameToNode[ dstName ]
                if linkopts:
                    net.addLink(srcNode, dstNode, cls=TCLink, **linkopts)
                else:
                    # debug( str(srcNode) )
                    # debug( str(dstNode), '\n' )
                    net.addLink(srcNode, dstNode)
                self.canvas.itemconfig(key, dash=())


    def build( self ):
        "Build network based on our topology."

        dpctl = None
        if len(self.appPrefs['dpctl']) > 0:
            dpctl = int(self.appPrefs['dpctl'])
        net = Mininet( topo=None,
                       listenPort=dpctl,
                       build=False,
                       ipBase=self.appPrefs['ipBase'] )

        self.buildNodes(net)
        self.buildLinks(net)

        # Build network (we have to do this separately at the moment )
        net.build()

        return net


    def postStartSetup( self ):

        # Setup host details
        for widget, item in self.widgetToItem.items():
            name = widget[ 'text' ]
            tags = self.canvas.gettags( item )
            if 'Host' in tags:
                newHost = self.net.get(name)
                opts = self.hostOpts[name]
                # Attach vlan interfaces
                if 'vlanInterfaces' in opts:
                    for vlanInterface in opts['vlanInterfaces']:
                        info( 'adding vlan interface '+vlanInterface[1], '\n' )
                        newHost.cmdPrint('ifconfig '+name+'-eth0.'+vlanInterface[1]+' '+vlanInterface[0])
                # Run User Defined Start Command
                if 'startCommand' in opts:
                    newHost.cmdPrint(opts['startCommand'])
            if 'Switch' in tags:
                newNode = self.net.get(name)
                opts = self.switchOpts[name]
                # Run User Defined Start Command
                if 'startCommand' in opts:
                    newNode.cmdPrint(opts['startCommand'])


        # Configure NetFlow
        nflowValues = self.appPrefs['netflow']
        if len(nflowValues['nflowTarget']) > 0:
            nflowEnabled = False
            nflowSwitches = ''
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )

                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    if 'netflow' in opts:
                        if opts['netflow'] == '1':
                            info( name+' has Netflow enabled\n' )
                            nflowSwitches = nflowSwitches+' -- set Bridge '+name+' netflow=@MiniEditNF'
                            nflowEnabled=True
            if nflowEnabled:
                nflowCmd = 'ovs-vsctl -- --id=@MiniEditNF create NetFlow '+ 'target=\\\"'+nflowValues['nflowTarget']+'\\\" '+ 'active-timeout='+nflowValues['nflowTimeout']
                if nflowValues['nflowAddId'] == '1':
                    nflowCmd = nflowCmd + ' add_id_to_interface=true'
                else:
                    nflowCmd = nflowCmd + ' add_id_to_interface=false'
                info( 'cmd = '+nflowCmd+nflowSwitches, '\n' )
                call(nflowCmd+nflowSwitches, shell=True)

            else:
                info( 'No switches with Netflow\n' )
        else:
            info( 'No NetFlow targets specified.\n' )

        # Configure sFlow
        sflowValues = self.appPrefs['sflow']
        if len(sflowValues['sflowTarget']) > 0:
            sflowEnabled = False
            sflowSwitches = ''
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )

                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    if 'sflow' in opts:
                        if opts['sflow'] == '1':
                            info( name+' has sflow enabled\n' )
                            sflowSwitches = sflowSwitches+' -- set Bridge '+name+' sflow=@MiniEditSF'
                            sflowEnabled=True
            if sflowEnabled:
                sflowCmd = 'ovs-vsctl -- --id=@MiniEditSF create sFlow '+ 'target=\\\"'+sflowValues['sflowTarget']+'\\\" '+ 'header='+sflowValues['sflowHeader']+' '+ 'sampling='+sflowValues['sflowSampling']+' '+ 'polling='+sflowValues['sflowPolling']
                info( 'cmd = '+sflowCmd+sflowSwitches, '\n' )
                call(sflowCmd+sflowSwitches, shell=True)

            else:
                info( 'No switches with sflow\n' )
        else:
            info( 'No sFlow targets specified.\n' )

        ## NOTE: MAKE SURE THIS IS LAST THING CALLED
        # Start the CLI if enabled
        if self.appPrefs['startCLI'] == '1':
            info( "\n\n NOTE: PLEASE REMEMBER TO EXIT THE CLI BEFORE YOU PRESS THE STOP BUTTON. Not exiting will prevent MiniEdit from quitting and will prevent you from starting the network again during this session.\n\n")
            CLI(self.net)

    def start( self ):
        "Start network."
        if self.net is None:
            self.net = self.build()

            # Since I am going to inject per switch controllers.
            # I can't call net.start().  I have to replicate what it
            # does and add the controller options.
            #self.net.start()
            info( '**** Starting %s controllers\n' % len( self.net.controllers ) )
            for controller in self.net.controllers:
                info( str(controller) + ' ')
                controller.start()
            info('\n')
            info( '**** Starting %s switches\n' % len( self.net.switches ) )
            #for switch in self.net.switches:
            #    info( switch.name + ' ')
            #    switch.start( self.net.controllers )
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    switchControllers = []
                    for ctrl in opts['controllers']:
                        switchControllers.append(self.net.get(ctrl))
                    info( name + ' ')
                    # Figure out what controllers will manage this switch
                    self.net.get(name).start( switchControllers )
                if 'LegacySwitch' in tags:
                    self.net.get(name).start( [] )
                    info( name + ' ')
            info('\n')

            self.postStartSetup()

    def stop( self ):
        "Stop network."
        if self.net is not None:
            # Stop host details
            for widget, item in self.widgetToItem.items():
                name = widget[ 'text' ]
                tags = self.canvas.gettags( item )
                if 'Host' in tags:
                    newHost = self.net.get(name)
                    opts = self.hostOpts[name]
                    # Run User Defined Stop Command
                    if 'stopCommand' in opts:
                        newHost.cmdPrint(opts['stopCommand'])
                if 'Switch' in tags:
                    newNode = self.net.get(name)
                    opts = self.switchOpts[name]
                    # Run User Defined Stop Command
                    if 'stopCommand' in opts:
                        newNode.cmdPrint(opts['stopCommand'])

            self.net.stop()
        cleanUpScreens()
        self.net = None

    def do_linkPopup(self, event):
        # display the popup menu
        if self.net is None:
            try:
                self.linkPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.linkPopup.grab_release()
        else:
            try:
                self.linkRunPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.linkRunPopup.grab_release()

    def do_controllerPopup(self, event):
        # display the popup menu
        if self.net is None:
            try:
                self.controllerPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.controllerPopup.grab_release()

    def do_legacyRouterPopup(self, event):
        # display the popup menu
        if self.net is not None:
            try:
                self.legacyRouterRunPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.legacyRouterRunPopup.grab_release()

    def do_hostPopup(self, event):
        # display the popup menu
        if self.net is None:
            try:
                self.hostPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.hostPopup.grab_release()
        else:
            try:
                self.hostRunPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.hostRunPopup.grab_release()

    def do_legacySwitchPopup(self, event):
        # display the popup menu
        if self.net is not None:
            try:
                self.switchRunPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.switchRunPopup.grab_release()

    def do_switchPopup(self, event):
        # display the popup menu
        if self.net is None:
            try:
                self.switchPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.switchPopup.grab_release()
        else:
            try:
                self.switchRunPopup.tk_popup(event.x_root, event.y_root, 0)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.switchRunPopup.grab_release()

    def xterm( self, _ignore=None ):
        "Make an xterm when a button is pressed."
        if ( self.selection is None or
             self.net is None or
             self.selection not in self.itemToWidget ):
            return
        name = self.itemToWidget[ self.selection ][ 'text' ]
        if name not in self.net.nameToNode:
            return
        term = makeTerm( self.net.nameToNode[ name ], 'Host', term=self.appPrefs['terminalType'] )
        if StrictVersion(MININET_VERSION) > StrictVersion('2.0'):
            self.net.terms += term
        else:
            self.net.terms.append(term)

    def iperf( self, _ignore=None ):
        "Make an xterm when a button is pressed."
        if ( self.selection is None or
             self.net is None or
             self.selection not in self.itemToWidget ):
            return
        name = self.itemToWidget[ self.selection ][ 'text' ]
        if name not in self.net.nameToNode:
            return
        self.net.nameToNode[ name ].cmd( 'iperf -s -p 5001 &' )

    ### BELOW HERE IS THE TOPOLOGY IMPORT CODE ###

    def parseArgs( self ):
        """Parse command-line args and return options object.
           returns: opts parse options dict"""

        if '--custom' in sys.argv:
            index = sys.argv.index( '--custom' )
            if len( sys.argv ) > index + 1:
                filename = sys.argv[ index + 1 ]
                self.parseCustomFile( filename )
            else:
                raise Exception( 'Custom file name not found' )

        desc = ( "The %prog utility creates Mininet network from the\n"
                 "command line. It can create parametrized topologies,\n"
                 "invoke the Mininet CLI, and run tests." )

        usage = ( '%prog [options]\n'
                  '(type %prog -h for details)' )

        opts = OptionParser( description=desc, usage=usage )

        addDictOption( opts, TOPOS, TOPODEF, 'topo' )
        addDictOption( opts, LINKS, LINKDEF, 'link' )

        opts.add_option( '--custom', type='string', default=None,
                         help='read custom topo and node params from .py ' +
                         'file' )

        self.options, self.args = opts.parse_args()
        # We don't accept extra arguments after the options
        if self.args:
            opts.print_help()
            exit()

    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."
        customs = {}
        if os.path.isfile( fileName ):
            with open( fileName, 'r' ) as f:
                exec( f.read() )  # pylint: disable=exec-used
            for name, val in customs.items():
                self.setCustom( name, val )
        else:
            raise Exception( 'could not find custom file: %s' % fileName )

    def importTopo( self ):
        info( 'topo='+self.options.topo, '\n' )
        if self.options.topo == 'none':
            return
        self.newTopology()
        topo = buildTopo( TOPOS, self.options.topo )
        link = customClass( LINKS, self.options.link )
        importNet = Mininet(topo=topo, build=False, link=link)
        importNet.build()

        c = self.canvas
        rowIncrement = 100
        currentY = 100

        # Add Controllers
        info( 'controllers:'+str(len(importNet.controllers)), '\n' )
        for controller in importNet.controllers:
            name = controller.name
            x = self.controllerCount*100+100
            self.addNode('Controller', self.controllerCount,
                 float(x), float(currentY), name=name)
            icon = self.findWidgetByName(name)
            icon.bind('<Button-3>', self.do_controllerPopup )
            ctrlr = { 'controllerType': 'ref',
                      'hostname': name,
                      'controllerProtocol': controller.protocol,
                      'remoteIP': controller.ip,
                      'remotePort': controller.port}
            self.controllers[name] = ctrlr


        currentY = currentY + rowIncrement

        # Add switches
        info( 'switches:'+str(len(importNet.switches)), '\n' )
        columnCount = 0
        for switch in importNet.switches:
            name = switch.name
            self.switchOpts[name] = {}
            self.switchOpts[name]['nodeNum']=self.switchCount
            self.switchOpts[name]['hostname']=name
            self.switchOpts[name]['switchType']='default'
            self.switchOpts[name]['controllers']=[]

            x = columnCount*100+100
            self.addNode('Switch', self.switchCount,
                 float(x), float(currentY), name=name)
            icon = self.findWidgetByName(name)
            icon.bind('<Button-3>', self.do_switchPopup )
            # Now link to controllers
            for controller in importNet.controllers:
                self.switchOpts[name]['controllers'].append(controller.name)
                dest = self.findWidgetByName(controller.name)
                dx, dy = c.coords( self.widgetToItem[ dest ] )
                self.link = c.create_line(float(x),
                                          float(currentY),
                                          dx,
                                          dy,
                                          width=4,
                                          fill='red',
                                          dash=(6, 4, 2, 4),
                                          tag='link' )
                c.itemconfig(self.link, tags=c.gettags(self.link)+('control',))
                self.addLink( icon, dest, linktype='control' )
                self.createControlLinkBindings()
                self.link = self.linkWidget = None
            if columnCount == 9:
                columnCount = 0
                currentY = currentY + rowIncrement
            else:
                columnCount =columnCount+1


        currentY = currentY + rowIncrement
        # Add hosts
        info( 'hosts:'+str(len(importNet.hosts)), '\n' )
        columnCount = 0
        for host in importNet.hosts:
            name = host.name
            self.hostOpts[name] = {'sched':'host'}
            self.hostOpts[name]['nodeNum']=self.hostCount
            self.hostOpts[name]['hostname']=name
            self.hostOpts[name]['ip']=host.IP()

            x = columnCount*100+100
            self.addNode('Host', self.hostCount,
                 float(x), float(currentY), name=name)
            icon = self.findWidgetByName(name)
            icon.bind('<Button-3>', self.do_hostPopup )
            if columnCount == 9:
                columnCount = 0
                currentY = currentY + rowIncrement
            else:
                columnCount =columnCount+1

        info( 'links:'+str(len(topo.links())), '\n' )
        #[('h1', 's3'), ('h2', 's4'), ('s3', 's4')]
        for link in topo.links():
            info( str(link), '\n' )
            srcNode = link[0]
            src = self.findWidgetByName(srcNode)
            sx, sy = self.canvas.coords( self.widgetToItem[ src ] )

            destNode = link[1]
            dest = self.findWidgetByName(destNode)
            dx, dy = self.canvas.coords( self.widgetToItem[ dest]  )

            params = topo.linkInfo( srcNode, destNode )
            info( 'Link Parameters='+str(params), '\n' )

            self.link = self.canvas.create_line( sx, sy, dx, dy, width=4,
                                             fill='blue', tag='link' )
            c.itemconfig(self.link, tags=c.gettags(self.link)+('data',))
            self.addLink( src, dest, linkopts=params )
            self.createDataLinkBindings()
            self.link = self.linkWidget = None

        importNet.stop()

def miniEditImages():
    "Create and return images for MiniEdit."

    # Image data. Git will be unhappy. However, the alternative
    # is to keep track of separate binary files, which is also
    # unappealing.

    return {
        'Select': BitmapImage(
            file='/usr/include/X11/bitmaps/left_ptr' ),

        'Switch': PhotoImage( data=r"""
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            """),

        'LegacySwitch': PhotoImage( data=r"""
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            """),

        'LegacyRouter': PhotoImage( data=r"""
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            """),

        'Controller': PhotoImage( data=r"""
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        'Host': PhotoImage( data=r"""
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        """ ),

        'OldSwitch': PhotoImage( data=r"""
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    }

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( sorted( choicesDict.keys() ) ) +
                    '[,param=value...]' )
    opts.add_option( '--' + name,
                     type='string',
                     default = default,
                     help = helpStr )

if __name__ == '__main__':
    setLogLevel( 'info' )
    app = MiniEdit()
    app.parseArgs()
    ### import topology if specified ###
    app.importTopo()
    app.mainloop()