#!/usr/bin/python

"""
MiniCCNxEdit: a simple network editor for MiniCCNx

Bob Lantz, April 2010
Gregory Gee, July 2013

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

MINIEDIT_VERSION = '2.2.0.1'

from optparse import OptionParser
from Tkinter import *
from ttk import Notebook
from tkMessageBox import showinfo, showerror, showwarning
from subprocess import call
import tkFont
import csv
import tkFileDialog
import tkSimpleDialog
import re
import json
from distutils.version import StrictVersion
import os
import sys
from functools import partial

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

# someday: from ttk import *

from mininet.log import info, error, debug, output, setLogLevel
from mininet.net import Mininet, VERSION
from mininet.util import ipStr, netParse, ipAdd, quietRun
from mininet.util import buildTopo
from mininet.util import custom, customConstructor
from mininet.term import makeTerm, cleanUpScreens
from mininet.node import Controller, RemoteController, NOX, OVSController
from mininet.node import CPULimitedHost, Host, Node
from mininet.node import OVSKernelSwitch, OVSSwitch, UserSwitch
from mininet.link import TCLink, Intf, Link
from mininet.cli import CLI
from mininet.moduledeps import moduleDeps, pathCheck
from mininet.topo import SingleSwitchTopo, LinearTopo, SingleSwitchReversedTopo
from mininet.topolib import TreeTopo

print 'MiniCCNxEdit running...' #+VERSION
MININET_VERSION = re.sub(r'[^\d\.]', '', VERSION)
if StrictVersion(MININET_VERSION) > StrictVersion('2.0'):
    from mininet.node import IVSSwitch

TOPODEF = 'none'
TOPOS = { 'minimal': lambda: SingleSwitchTopo( k=2 ),
          'linear': LinearTopo,
          'reversed': SingleSwitchReversedTopo,
          'single': SingleSwitchTopo,
          'none': None,
          'tree': TreeTopo }
LINKDEF = 'default'
LINKS = { 'default': Link,
          'tc': TCLink }
HOSTDEF = 'proc'
HOSTS = { 'proc': Host,
          'rt': custom( CPULimitedHost, sched='rt' ),
          'cfs': custom( CPULimitedHost, sched='cfs' ) }

class LegacyRouter( Node ):

    def __init__( self, name, inNamespace=True, **params ):
        Node.__init__( self, name, inNamespace, **params )

    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 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 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, *args, **kw):
        LabelFrame.__init__(self, parent, text=title, padx=5, pady=5, *args, **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)

        return

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 ):
        #print "Adding row " + str(self.rows +1)
        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 == True):
                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 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
            tw.tk.call("::tk::unsupported::MacWindowStyle",
                       "style", tw._w,
                       "help", "noActivates")
        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 MiniCCNx."

    def __init__( self, parent=None, cheight=600, cwidth=1000, template_file='miniccnx.conf' ):

        #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'}

        }
	
	self.template_file = template_file

        Frame.__init__( self, parent )
        self.action = None
        self.appName = 'MiniccnxEdit'
        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', 'LegacyRouter', 'NetLink' )
        self.customColors = { 'LegacyRouter': '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', 'Host': 'h'}
        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()

	#Mouse bindings
	self.bind( '<Button-1>', lambda event: self.clearPopups )

        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.legacyRouterPopup = Menu(self.top, tearoff=0)
        self.legacyRouterPopup.add_command(label='Router Options', font=self.font)

        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 )

        # 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 ): # MODIFICADO - OK
        "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.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 )
	
        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 ) )

	# Application menu
        appMenu = Menu( mbar, tearoff=False )
        mbar.add_cascade( label=self.appName, font=font, menu=appMenu )
        appMenu.add_command( label='About Mini-CCNx', command=self.about,
                             font=font)
        #appMenu.add_separator()
        #appMenu.add_command( label='Quit', command=self.quit, font=font )

    # Canvas - TUDO IGUAL - OK

    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 ): #IGUAL - OK
        "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


    def createToolTip(self, widget, text): #NOVA - CRIA HINTS E TIPS
        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 ): #MODIFICADO - OK
        "Create and return our toolbar frame."

        toolbar = Frame( self )

        # Tools
        for tool in self.tools:
            cmd = ( lambda t=tool: self.activate( t ) )
            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' )

	# abaixo copiado Mini-CCNx para criar botao Generate

        for cmd, color in [ ( 'Generate', '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 doGenerate( self ): #COPIA Mini-CCNx - GERA TEMPLATE
        "Generate template."
        self.activate( 'Select' )
        for tool in self.tools:
            self.buttons[ tool ].config( state='disabled' )

        self.buildTemplate()

        for tool in self.tools:
            self.buttons[ tool ].config( state='normal' )

    #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 buildTemplate( self ): #COPIA Mini-CCNx para criar Template
        "Generate template"

        template = open(self.template_file, 'w')

        # hosts
        template.write('[hosts]\n')
        for widget in self.widgetToItem:
            name = widget[ 'text' ]
            tags = self.canvas.gettags( self.widgetToItem[ widget ] )
            if 'Host' in tags:
                template.write(name + ':\n')

        # switches/routers
        template.write('[routers]\n')
        for router in self.switchOpts.values():
	    #print router
	    hostname=router['hostname']
	    nodetype=router['switchType']
	    nodenum=router['nodeNum']

	    template.write(hostname + ':\n')

            #name = widget[ 'text' ]
            #tags = self.canvas.gettags( self.widgetToItem[ widget ] )
            #if 'Switch' in tags:
                #template.write(name + ':\n')

        # Make links
        template.write('[links]\n')
        for link in self.links.values():
             dst=link['dest']
	     src=link['src']
	     linkopts=link['linkOpts']
	     linktype=link['type']
	     
	     #print linkopts
	     #print linktype

             srcName, dstName = src[ 'text' ], dst[ 'text' ]
             template.write(srcName + ':' + dstName + '\n')

	template.close()

    def addNode( self, node, nodeNum, x, y, name=None):
        "Add a new node to our canvas."
        if 'Switch' == node:
            self.switchCount += 1
        if 'Host' == node:
            self.hostCount += 1
        if 'Controller' == node:
            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."
        c = self.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, input):
        "Some part of Mininet don't like Unicode"
        if isinstance(input, dict):
            return {self.convertJsonUnicode(key): self.convertJsonUnicode(value) for key, value in input.iteritems()}
        elif isinstance(input, list):
            return [self.convertJsonUnicode(element) for element in input]
        elif isinstance(input, unicode):
            return input.encode('utf-8')
        else:
            return input

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

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

        # Load application preferences
        if 'application' in loadedTopology:
            self.appPrefs = dict(self.appPrefs.items() + loadedTopology['application'].items())
            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 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 '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 )
            self.switchOpts[hostname] = switch['opts']

        # 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

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

    def saveTopology( self ):
        "Save command."
        myFormats = [
            ('Miniccnx Topology','*.mnccnx'),
            ('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 in self.widgetToItem:
                name = widget[ 'text' ]
                tags = self.canvas.gettags( self.widgetToItem[ widget ] )
                x1, y1 = self.canvas.coords( self.widgetToItem[ widget ] )
                if '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)
                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:
                f = open(fileName, 'wb')
                f.write(json.dumps(savingDictionary, sort_keys=True, indent=4, separators=(',', ': ')))
            except Exception as er:
                print er
            finally:
                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 clearPopups(self):
	print 'Entrou funcao clear_popups'

    	if isHostPopup == True:
		print 'Hostpopup = true'
    		self.hostPopup.unpost
		isHostPopup = False
	#if isRouterPopup == True
	#if isLinkPopup == True

    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 'Switch' == node:
            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 'LegacyRouter' == node:
            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 'LegacySwitch' == node:
            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 'Host' == node:
            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

        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 'LegacyRouter' == node:
            icon.bind('<Button-3>', self.do_legacyRouterPopup )
        if 'Host' == node:
            icon.bind('<Button-3>', self.do_hostPopup )

    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 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 is 'NetLink':
            self.startLink( event )
        else:
            self.selectNode( event )
        return 'break'

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

    def releaseNode( self, event ):
        "Node release handler."
        if self.active is '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 )
        if (('Host' in stags and 'Host' in dtags)):
            self.releaseNetLink( event )
            return

        # Set link type
        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 )
        
        # 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' )
            info = self.appName + ': a simple network editor for MiniCCNx'
            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=info, 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 )
            hide = ( lambda about=about: 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."

    def checkIntf( self, 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
            print 'New host details for ' + name + ' = ' + str(newHostOpts)

    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
            print 'New link details = ' + str(linkBox.result)

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

    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)

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

    def rootTerminal( self, _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={} ):
        "Add link to model."
        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)
            
        for link in 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
        print "Getting Hosts and Switches."
        for widget in self.widgetToItem:
            name = widget[ 'text' ]
            tags = self.canvas.gettags( self.widgetToItem[ widget ] )
            #print name+' has '+str(tags)

            if 'LegacyRouter' in tags:
                newSwitch = net.addHost( name , cls=LegacyRouter)
            elif 'Host' in tags:
                opts = self.hostOpts[name]
                #print str(opts)
                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
                print hostCls
                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:
                        print 'Checking that OS is VLAN prepared'
                        self.pathCheck('vconfig', moduleName='vlan package')
                        moduleDeps( add='8021q' )
            else:
                raise Exception( "Cannot create mystery node: " + name )

    def pathCheck( self, *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
        print "Getting Links."
        for key,link in self.links.iteritems():
            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:
                    #print str(srcNode)
                    #print str(dstNode)
                    net.addLink(srcNode, dstNode)
                self.canvas.itemconfig(key, dash=())


    def build( self ):
        print "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 in self.widgetToItem:
            name = widget[ 'text' ]
            tags = self.canvas.gettags( self.widgetToItem[ widget ] )
            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']:
                        print 'adding vlan interface '+vlanInterface[1]
                        newHost.cmdPrint('ifconfig '+name+'-eth0.'+vlanInterface[1]+' '+vlanInterface[0])
                # Run User Defined Start Command
                if ('startCommand' in opts):
                    newHost.cmdPrint(opts['startCommand'])

        # Configure NetFlow
        nflowValues = self.appPrefs['netflow']
        if len(nflowValues['nflowTarget']) > 0:
            nflowEnabled = False
            nflowSwitches = ''
            for widget in self.widgetToItem:
                name = widget[ 'text' ]
                tags = self.canvas.gettags( self.widgetToItem[ widget ] )
    
                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    if 'netflow' in opts:
                        if opts['netflow'] == '1':
                            print name+' has Netflow enabled'
                            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'
                print 'cmd = '+nflowCmd+nflowSwitches
                call(nflowCmd+nflowSwitches, shell=True)

            else:
                print 'No switches with Netflow'
        else:
            print 'No NetFlow targets specified.'

        # Configure sFlow
        sflowValues = self.appPrefs['sflow']
        if len(sflowValues['sflowTarget']) > 0:
            sflowEnabled = False
            sflowSwitches = ''
            for widget in self.widgetToItem:
                name = widget[ 'text' ]
                tags = self.canvas.gettags( self.widgetToItem[ widget ] )
    
                if 'Switch' in tags:
                    opts = self.switchOpts[name]
                    if 'sflow' in opts:
                        if opts['sflow'] == '1':
                            print name+' has sflow enabled'
                            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']
                print 'cmd = '+sflowCmd+sflowSwitches
                call(sflowCmd+sflowSwitches, shell=True)

            else:
                print 'No switches with sflow'
        else:
            print 'No sFlow targets specified.'

        ## 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 sessoin.\n\n")
            CLI(self.net)

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

            for widget in self.widgetToItem:
                name = widget[ 'text' ]
                tags = self.canvas.gettags( self.widgetToItem[ widget ] )

            self.postStartSetup()

    def stop( self ):
        "Stop network."
        if self.net is not None:
            # Stop host details
            for widget in self.widgetToItem:
                name = widget[ 'text' ]
                tags = self.canvas.gettags( self.widgetToItem[ widget ] )
                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'])

            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)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.linkPopup.grab_release()

    def do_legacyRouterPopup(self, event):
        # display the popup menu
        if ( self.net is None ):
            try:
                self.legacyRouterPopup.tk_popup(event.x_root, event.y_root)
            finally:
                # make sure to release the grab (Tk 8.0a1 only)
                self.legacyRouterPopup.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)
		    isHostPopup = True
		finally:
		    # make sure to release the grab (Tk 8.0a1 only)
		    self.hostPopup.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 Miniccnx network from the\n"
                 "command line. It can create parametrized topologies,\n"
                 "invoke the Miniccnx CLI, and run tests." )

        usage = ( '%prog [options] [template_file]\n'
		  '\nIf no template_file is given, generated template will be written to the file miniccnx.conf in the current directory.\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:
	     if len(self.args) > 1:
	     	opts.print_help()
             	exit()
	     else:
	     	self.template_file=self.args[0]

    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 ):
            execfile( fileName, customs, customs )
            for name, val in customs.iteritems():
                self.setCustom( name, val )
        else:
            raise Exception( 'could not find custom file: %s' % fileName )

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

        c = self.canvas
        rowIncrement = 100
        currentY = 100

        # Add switches
        print 'switches:'+str(len(importNet.switches))
        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 )

            if columnCount == 9:
                columnCount = 0
                currentY = currentY + rowIncrement
            else:
                columnCount =columnCount+1

        currentY = currentY + rowIncrement
        # Add hosts
        print 'hosts:'+str(len(importNet.hosts))
        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

        print 'links:'+str(len(topo.links()))
        #[('h1', 's3'), ('h2', 's4'), ('s3', 's4')]
        for link in topo.links():
            print str(link)
            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 )
            print 'Link Parameters='+str(params)

            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' ),

        'LegacyRouter': PhotoImage( data=r"""
	    R0lGODlhMgAYAPcAAAEBAXZ8gQNAgL29vQNctjl/xVSa4j1dfCF+3QFq1DmL3wJMmAMzZZW11dnZ
	    2SFrtyNdmTSO6gIZMUKa8gJVqEOHzR9Pf5W74wFjxgFx4jltn+np6Eyi+DuT6qKiohdtwwUPGWiq
	    6ymF4LHH3Rh11CV81kKT5AMoUA9dq1ap/mV0gxdXlytRdR1ptRNPjTt9vwNgvwJZsX+69gsXJQFH
	    jTtjizF0tvHx8VOm9z2V736Dhz2N3QM2acPZ70qe8gFo0HS19wVRnTiR6hMpP0eP1i6J5iNlqAtg
	    tktjfQFu3TNxryx4xAMTIzOE1XqAh1uf5SWC4AcfNy1XgQJny93n8a2trRh312Gt+VGm/AQIDTmB
	    yAF37QJasydzvxM/ayF3zhdLf8zLywFdu4i56gFlyi2J4yV/1w8wUo2/8j+X8D2Q5Eee9jeR7Uia
	    7DpeggFt2QNPm97e3jRong9bpziH2DuT7aipqQoVICmG45vI9R5720eT4Q1hs1er/yVVhwJJktPh
	    70tfdbHP7Xev5xs5V7W1sz9jhz11rUVZcQ9WoCVVhQk7cRdtwWuw9QYOFyFHbSBnr0dznxtWkS18
	    zKfP9wwcLAMHCwFFiS5UeqGtuRNNiwMfPS1hlQMtWRE5XzGM5yhxusLCwCljnwMdOFWh7cve8pG/
	    7Tlxp+Tr8g9bpXF3f0lheStrrYu13QEXLS1ppTV3uUuR1RMjNTF3vU2X4TZupwRSolNne4nB+T+L
	    2YGz4zJ/zYe99YGHjRdDcT95sx09XQldsgMLEwMrVc/X3yN3yQ1JhTRbggsdMQNfu9HPz6WlpW2t
	    7RctQ0GFyeHh4dvl8SBZklCb5kOO2kWR3Vmt/zdjkQIQHi90uvPz8wIVKBp42SV5zbfT7wtXpStV
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        'Host': PhotoImage( data=r"""
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        """ ),

        'NetLink': 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()
    """ import topology if specified """
    app.parseArgs()
    app.importTopo()

    global isHostPopup
    global isRouterPopup
    global isLinkPopup

    app.mainloop()