[rrd-users] rrd python help needed.

[Jeremiah Jester]

Seasons greeting,

I'm hoping someone on here can help me understand rrdtool a little
better. I have a python script that is interacting with the rrdtool
module via import.

What I am trying to do is to collect data from /dev/proc for eth0
device , grab new stats about traffic every 2 seconds, and assign those
values to a list and attempting to generate the plotted points
accordingly.

However, it appears that I'm not passing the values in properly as It
errors out if I add more than one value. I'm essentially passing a list
of values to this line of code: 

'LINE1:%s#CC9999:Net1' % a,

If i change the value from the list to just one number then it just
plots a straight line. 

Can anyone point me in the right direction so that the chart will plot
the varying data i've collected? Script is attached and inline.

Thanks,
JJ

===

#!/usr/bin/python
import rrdtool, time, random, sys, ConfigParser

def get_proc_net_dev(interface_dict):
        for line in open('/proc/net/dev','r'):
                if ':' not in line: continue

                for interface in interface_dict:
                        if interface not in line: continue
                        line = line.strip().split(':')[1]
                        x = line.split()
                        rx_kbytes = int(x[0])/1024
                        rx_packets = int(x[1])
                        tx_kbytes = int(x[8])/1024
                        tx_packets = int(x[9])
                        interface_dict[interface] = (rx_kbytes,
rx_packets, tx_kbytes, tx_packets)


def create_graph():

	stime = int(time.time()) - 3 * 86400 
	dpoints = 10
	etime = stime + (dpoints * 300)
	fname = 'test.rrd'
	gfname = 'test.png'
 
	#CREATE GRAPH 1ST

	rrdtool.create('test.rrd' ,
	         '--start' , str(stime),
		 #### can sepcify end time below
		 # '--end' , str(endtime)
		 #add DS for another line element
        	 'DS:speed:COUNTER:600:U:U',
		 'DS:average:GAUGE:600:U:U',
	         'DS:min:COUNTER:600:U:U',
		 'RRA:AVERAGE:0.5:1:576',
        	 'RRA:AVERAGE:0.5:6:336'
	)
 
	ctime = stime
	cmiles = 0

	#GET & PARSE UPDATED DATA
	my_array=parse(fname,ctime)

	#GRAB VALUES FROM PARSE	
	a=my_array[0]
	b=my_array[1]
	c=my_array[2]
	
	print a
	print b
	print c


	#LASTLY, GRAPH THE UPDATED DATA
	rrdtool.graph(gfname ,
	        '--start' , str(etime - (24 * 3600)) ,
	        '--end' , str(etime) ,
	        '--vertical-label' , 'CPU Load' ,
       		'--imgformat' , 'PNG' ,
        	'--title' , 'System Load Average' ,
        	'--lower-limit' , '0' ,
        	
		'DEF:myspeed=%s:speed:AVERAGE' % fname ,

		'CDEF:mph=myspeed,3600,*' ,
        	'VDEF:msmax=mph,MAXIMUM' ,
        	'VDEF:msavg=mph,AVERAGE' ,
        	'VDEF:msmin=mph,MINIMUM' ,
        	
		#lines
		'LINE1:%s#CC9999:Net1' % a,
        	'LINE2:%s#FF0000:Net2' % b,
		'LINE3:%s#FFDDDD:Net3' % c,

        	#r'GPRINT:msmax:Max\: %6.1lf Load' ,
        	#r'GPRINT:msavg:Avg\: %6.1lf Load' ,
        	#r'GPRINT:msmin:Min\: %6.1lf Load\l' ,
	) 

def parse(fname, ctime):

        interface_dict = {'eth0':None}
        get_proc_net_dev(interface_dict)
        old_interface_dict = interface_dict

	i=0

	#declare lists
	stat0_list=[]
	stat1_list=[]
	stat2_list=[]

	while i<=5:
		i+=1
                get_proc_net_dev(interface_dict)
	           
		print interface_dict
		
		#update graph with new numbers
		# loop through interface_dict items
	    	# {wlan: (123, 123, 123)}
	
	    	for x,y in interface_dict.items():
			net_device=x
			for x in y:
				stat0=y[0]
				stat1=y[1]
				stat2=y[2]

		#add each iter item to list
		stat0_list.append(stat0)
		stat1_list.append(stat1)
		stat2_list.append(stat2)

		
		print "STAT0:",stat0		
		print "STAT1:",stat1	
		print "STAT2:",stat2	

		ctime=ctime
		ctime+=300		

		print "CTIME:",ctime

		rrdtool.update(fname, '%s:%s:%s:%s' % (ctime,stat0,stat1,stat2))

	    	time.sleep(2)

	return stat0_list, stat1_list, stat2_list

create_graph()




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