Ondra Mandik

Zadání: Monitoring parametru procesoru pres protokol SNMP v GUI s

Schválení:

Semestralni prace je postavena nad Linuxem (distrubuce UBUNTU) s nainstalovanymi balicky

• snmp
• snmpwalk
• snmpget
• gtk..
• python
• python-wxpython

prace je implementovana v jednom davkovem souboru pri interpreter python. Konfirgurace je v prvnich radcich kodu v konstantach FROM, VERSION, apod.

zdrojovy kod aplikace je zde:

<source lang=“python”> #!/usr/bin/python

import os, wx, re, threading, time
import wx.lib.plot as plot

ID_ABOUT = 101
ID_EXIT = 110
ID_REFRESH = 112
TIMER_ID = 100 

class SnmpGuiClient(wx.Frame):

	FROM = 'localhost'

	COMMUNITY = 'public'

	VERSION = '2c'

	DATA = [
		('.1.3.6.1.4.1.2021.11.9.0','red','Users CPU time'),
		('.1.3.6.1.4.1.2021.11.11.0','blue','System CPU time'),
		('.1.3.6.1.4.1.2021.11.10.0','green','Idle CPU time')
	]

	REFRESH_TIME = 400

	DATA_QUEUE_LENGTH = 100

	timer = None

	plotter = None
	
	dataQueue = []

	def __init__(self,parent,title):
		self.frame = wx.Frame.__init__(self,parent,wx.ID_ANY, title, size = (400,200))

		#creating graph		
		plotPanel = wx.Panel(self)
		plotPanel.SetBackgroundColour("white")
		vbox = wx.BoxSizer(wx.VERTICAL)
		plotPanel.SetSizer(vbox)

		self.plotter = plot.PlotCanvas(plotPanel)
		vbox.Add(self.plotter, 1, wx.EXPAND | wx.ALL, 5)  
		self.plotter.SetSize(size=(300,300))
		self.plotter.SetShowScrollbars(True)
		self.plotter.SetEnableZoom(False)	
		self.plotter.SetEnableGrid(False)
		self.plotter.SetXSpec(type='none')
		self.plotter.SetEnableLegend(True)
			
		# Creting status bar
		self.CreateStatusBar() # A StatusBar in the bottom of the window
	
		# Setting up the menu.
		filemenu= wx.Menu()
		filemenu.Append(ID_ABOUT, "&About"," Information about this program")
		filemenu.AppendSeparator()
		filemenu.Append(ID_EXIT,"E&xit"," Terminate the program")
	
		actionmenu = wx.Menu()
		actionmenu.Append(ID_REFRESH, "&Refresh", "Refresh graph")

		# Creating the menubars.
		menuBar = wx.MenuBar()
		menuBar.Append(filemenu,"&File") # Adding the "filemenu" to the MenuBar
		menuBar.Append(actionmenu,"&Actions") # Adding the "filemenu" to the MenuBar
		self.SetMenuBar(menuBar)  # Adding the MenuBar to the Frame content.

		# Start timer
		self.timer = wx.Timer(self, TIMER_ID)
		self.timer.Start(self.REFRESH_TIME) 

		wx.EVT_MENU(self, ID_ABOUT, self.OnAbout) 
		wx.EVT_MENU(self, ID_EXIT, self.OnExit)
		wx.EVT_MENU(self, ID_REFRESH, self.OnRefresh)
		wx.EVT_TIMER(self, TIMER_ID, self.OnTimer) 
	
		self.initQueue()
		self.refresh()
		self.Centre()  
		self.Show(True)

	def OnAbout(self,e):
		d= wx.MessageDialog( self, "A sample editor \n in wxPython","About Sample Editor", wx.OK)
 		d.ShowModal()
		d.Destroy()

	def OnExit(self,e):
		self.Close(True) 

	def OnRefresh(self,e):
		self.refresh()

	def OnTimer(self,e):
		self.refresh()	
		self.timer.Start(self.REFRESH_TIME) 

	def initQueue(self):
		for i in range(0,len(self.DATA)):
			self.dataQueue.insert(i,[]);
			for j in range(0,self.DATA_QUEUE_LENGTH):
				self.dataQueue[i].insert(j,0);

	def refresh(self):
		for i in range(0,len(self.DATA)):
			self.dataQueue[i].pop(0)
			self.dataQueue[i].append(self.snmpGetInt(self.DATA[i][0]))
		self.redrawPlot()

	def snmpGetInt(self,oid):
		intRe = re.compile("^.*INTEGER: ([0-9]+)$")
		cmd = "snmpget -c %s -v %s -O s %s %s" % (self.COMMUNITY,self.VERSION,self.FROM,oid)
		pipe = os.popen(cmd)
		return int(intRe.match(pipe.read()).group(1))

	def redrawPlot(self):
		lines = []
		for i in range(0,len(self.DATA)):
			data = []
			for j in range(0,self.DATA_QUEUE_LENGTH):
				data.append((j,self.dataQueue[i][j]));
			lines.insert(i,plot.PolyLine(data, colour=self.DATA[i][1], width=4,legend=self.DATA[i][2]))
	
		gc = plot.PlotGraphics(lines, ('CPU Usage %s' % self.FROM), "", "CPU Usage")
		self.plotter.Draw(gc, xAxis=(0,self.DATA_QUEUE_LENGTH), yAxis=(0,100))

			
#Run main loop
if __name__ == '__main__':

	app = wx.PySimpleApp()
	frame = SnmpGuiClient(None,"SNMP GUI CLIENT")	
	app.MainLoop()

</source>

Presentaci muzete stahnout na grafymandio1.pdf

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