245 lines
8.1 KiB
Python
Executable File
245 lines
8.1 KiB
Python
Executable File
#!/usr/bin/python
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"""
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consoles.py: bring up a bunch of miniature consoles on a virtual network
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This demo shows how to monitor a set of nodes by using
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Node's monitor() and Tkinter's createfilehandler().
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"""
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from Tkinter import *
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from mininet.log import setLogLevel
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from mininet.topolib import TreeNet
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from mininet.term import makeTerms, cleanUpScreens
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from mininet.util import quietRun
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class Console( Frame ):
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"A simple console on a host."
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def __init__( self, parent, net, node, height=10, width=32, title='Node' ):
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Frame.__init__( self, parent )
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self.net = net
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self.node = node
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self.prompt = node.name + '# '
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self.height, self.width, self.title = height, width, title
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# Initialize widget styles
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self.buttonStyle = { 'font': 'Monaco 7' }
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self.textStyle = {
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'font': 'Monaco 7',
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'bg': 'black',
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'fg': 'green',
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'width': self.width,
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'height': self.height,
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'relief': 'sunken',
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'insertbackground': 'green',
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'highlightcolor': 'green',
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'selectforeground': 'black',
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'selectbackground': 'green'
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}
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# Set up widgets
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self.text = self.makeWidgets( )
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self.bindEvents()
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self.append( self.prompt )
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def makeWidgets( self ):
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"Make a label, a text area, and a scroll bar."
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def newTerm( net=self.net, node=self.node, title=self.title ):
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"Pop up a new terminal window for a node."
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net.terms += makeTerms( [ node ], title )
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label = Button( self, text=self.node.name, command=newTerm,
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**self.buttonStyle )
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label.pack( side='top', fill='x' )
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text = Text( self, wrap='word', **self.textStyle )
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ybar = Scrollbar( self, orient='vertical', width=7, command=text.yview )
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text.configure( yscrollcommand=ybar.set )
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text.pack( side='left', expand=True, fill='both' )
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ybar.pack( side='right', fill='y' )
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return text
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def bindEvents( self ):
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"Bind keyboard and file events."
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# The text widget handles regular key presses, but we
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# use special handlers for the following:
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self.text.bind( '<Return>', self.handleReturn )
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self.text.bind( '<Control-c>', self.handleInt )
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# This is not well-documented, but it is the correct
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# way to trigger a file event handler from Tk's
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# event loop!
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self.tk.createfilehandler( self.node.stdout, READABLE,
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self.handleReadable )
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def append( self, text ):
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"Append something to our text frame."
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self.text.insert( 'end', text )
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self.text.mark_set( 'insert', 'end' )
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self.text.see( 'insert' )
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def handleReturn( self, event ):
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"Handle a carriage return."
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cmd = self.text.get( 'insert linestart', 'insert lineend' )
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if cmd.find( self.prompt ) == 0:
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cmd = cmd[ len( self.prompt ): ]
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self.sendCmd( cmd )
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def handleInt( self, event=None ):
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"Handle control-c."
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self.node.sendInt()
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def sendCmd( self, cmd ):
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"Send a command to our node."
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text, node = self.text, self.node
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if not node.waiting:
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node.sendCmd( cmd )
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def handleReadable( self, file=None, mask=None ):
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"Handle file readable event."
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data = self.node.monitor()
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self.append( data )
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if not self.node.waiting:
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# Print prompt
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self.append( self.prompt )
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def waitOutput( self ):
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"Wait for any remaining output."
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while self.node.waiting:
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self.handleReadable( self )
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def clear( self ):
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"Clear all of our text."
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self.text.delete( '1.0', 'end' )
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class ConsoleApp( Frame ):
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menuStyle = { 'font': 'Geneva 7 bold' }
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def __init__( self, net, parent=None, width=4 ):
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Frame.__init__( self, parent )
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self.top = self.winfo_toplevel()
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self.top.title( 'Mininet' )
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self.net = net
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self.menubar = self.createMenuBar()
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cframe = self.cframe = Frame( self )
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self.consoles = {} # consoles themselves
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titles = {
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'hosts': 'Host',
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'switches': 'Switch',
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'controllers': 'Controller'
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}
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for name in titles:
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nodes = getattr( net, name )
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frame, consoles = self.createConsoles(
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cframe, nodes, width, titles[ name ] )
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self.consoles[ name ] = Object( frame=frame, consoles=consoles )
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self.selected = None
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self.select( 'hosts' )
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self.cframe.pack( expand=True, fill='both' )
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self.pack( expand=True, fill='both' )
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cleanUpScreens()
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# Close window gracefully
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Wm.wm_protocol( self.top, name='WM_DELETE_WINDOW', func=self.quit )
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def createConsoles( self, parent, nodes, width, title ):
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"Create a grid of consoles in a frame."
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f = Frame( parent )
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# Create consoles
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consoles = []
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index = 0
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for node in nodes:
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console = Console( f, net, node, title=title )
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consoles.append( console )
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row = index / width
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column = index % width
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console.grid( row=row, column=column, sticky='nsew' )
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index += 1
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f.rowconfigure( row, weight=1 )
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f.columnconfigure( column, weight=1 )
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return f, consoles
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def select( self, set ):
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"Select a set of consoles to display."
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if self.selected is not None:
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self.selected.frame.pack_forget()
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self.selected = self.consoles[ set ]
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self.selected.frame.pack( expand=True, fill='both' )
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def createMenuBar( self ):
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"Create and return a menu (really button) bar."
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f = Frame( self )
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buttons = [
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( 'Hosts', lambda: self.select( 'hosts' ) ),
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( 'Switches', lambda: self.select( 'switches' ) ),
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( 'Controllers', lambda: self.select( 'controllers' ) ),
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( 'Ping', self.ping ),
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( 'Iperf', self.iperf ),
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( 'Interrupt', self.stop ),
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( 'Clear', self.clear ),
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( 'Quit', self.quit )
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]
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for name, cmd in buttons:
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b = Button( f, text=name, command=cmd, **self.menuStyle )
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b.pack( side='left' )
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f.pack( padx=4, pady=4, fill='x' )
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return f
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def clear( self ):
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"Clear all consoles."
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for console in self.selected.consoles:
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console.clear()
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def ping( self ):
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"Tell each host to ping the next one."
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consoles = self.consoles[ 'hosts' ].consoles
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count = len( consoles )
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i = 0
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for console in consoles:
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i = ( i + 1 ) % count
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ip = consoles[ i ].node.IP()
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console.sendCmd( 'ping ' + ip )
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def iperf( self ):
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"Tell each host to iperf to the next one."
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consoles = self.consoles[ 'hosts' ].consoles
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count = len( consoles )
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for console in consoles:
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console.node.cmd( 'iperf -sD' )
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i = 0
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for console in consoles:
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i = ( i + 1 ) % count
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ip = consoles[ i ].node.IP()
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console.sendCmd( 'iperf -t 99999 -i 1 -c ' + ip )
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def stop( self ):
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"Interrupt all hosts."
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consoles = self.consoles[ 'hosts' ].consoles
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for console in consoles:
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console.handleInt()
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for console in consoles:
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console.waitOutput()
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# Shut down any iperfs that might still be running
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quietRun( 'killall -9 iperf' )
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def quit( self ):
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"Stope everything and quit."
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print "Quit"
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self.stop()
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Frame.quit( self )
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class Object( object ):
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"Generic object you can stuff junk into."
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def __init__( self, **kwargs ):
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for name, value in kwargs.items():
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setattr( self, name, value )
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if __name__ == '__main__':
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setLogLevel( 'info' )
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net = TreeNet( depth=2, fanout=4 )
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net.start()
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app = ConsoleApp( net, width=4 )
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app.mainloop()
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net.stop()
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