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#!/usr/bin/python3
# based on https://github.com/cnvogelg/ardu/blob/master/datalog/tools/plot_log.py
import sys
import subprocess
import os
if len(sys.argv) != 3:
print("Usage: plot.py <log> <png>", file=sys.stderr)
sys.exit(1)
log_file = sys.argv[1]
png_file = sys.argv[2]
rrd_file = "tmp.rrd"
create = [
'rrdtool','create',rrd_file,'--step','30','--start',0,
'DS:temp:GAUGE:50:U:U',
'RRA:AVERAGE:0.5:1:10000',
'RRA:MIN:0.5:1:10000',
'RRA:MAX:0.5:1:10000'
]
graph = [
'rrdtool','graph',png_file,
'-s',None,'-e',None,
'--height=300','--width=750',
'--color=BACK#FFFFFF',
'--vertical-label', '°C',
'--title','Temperature',
'-l','25','-u','30',
'DEF:temp='+rrd_file+':temp:AVERAGE',
'LINE1:temp#3366CC'
]
samples = []
f = open(log_file,"r")
for line in f:
elem = line.split(' ')
temp = float(elem[1].split("=")[1])
ts = int(elem[0])
samples.append((ts,temp))
f.close()
# create rrd
start_ts = samples[0][0]
end_ts = samples[-1][0]
create[6] = str(start_ts - 1)
print("creating rrdb:",create)
ret = subprocess.call(create)
if ret != 0:
print("ERROR calling: {}".format(" ".join(create)))
sys.exit(1)
# update rrd
n = len(samples)
for i in range(n):
print(i,n,end="\r")
sys.stdout.flush()
s = samples[i]
entry = "{}:{}".format(s[0],s[1])
cmd = ['rrdupdate',rrd_file,'--',entry]
ret = subprocess.call(cmd)
if ret != 0:
print("ERROR calling: {}".format(" ".join(cmd)))
sys.exit(1)
# graph
print("plotting rrdb:",graph)
graph[4] = str(start_ts)
graph[6] = str(end_ts)
ret = subprocess.call(graph)
if ret != 0:
print("ERROR calling: {}".format(" ".join(cmd)))
sys.exit(1)
os.unlink(rrd_file)
print("done")
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