bindings/ruby/test.rb

   1 #!/usr/bin/env ruby
   2 # $Id: test.rb,v 1.2 2002/10/22 17:34:00 miles Exp $
   3 # Driver does not carry cash.
   4
   5 $: << '/scratch/rrd12build/lib/ruby/1.8/i386-linux/'
   6
   7 require "RRD"
   8
   9 name = "test"
  10 rrd = "#{name}.rrd"
  11 start = Time.now.to_i
  12
  13 puts "creating #{rrd}"
  14 RRD.create(
  15     rrd,
  16     "--start", "#{start - 1}",
  17     "--step", "300",
  18         "DS:a:GAUGE:600:U:U",
  19     "DS:b:GAUGE:600:U:U",
  20     "RRA:AVERAGE:0.5:1:300")
  21 puts
  22
  23 puts "updating #{rrd}"
  24 start.to_i.step(start.to_i + 300 * 300, 300) { |i|
  25     RRD.update(rrd, "#{i}:#{rand(100)}:#{Math.sin(i / 800) * 50 + 50}")
  26 }
  27 puts
  28
  29 puts "fetching data from #{rrd}"
  30 (fstart, fend, data) = RRD.fetch(rrd, "--start", start.to_s, "--end", (start + 300 * 300).to_s, "AVERAGE")
  31 puts "got #{data.length} data points from #{fstart} to #{fend}"
  32 puts
  33
  34 puts "generating graph #{name}.png"
  35 RRD.graph(
  36    "#{name}.png",
  37     "--title", " RubyRRD Demo",
  38     "--start", "#{start+3600}",
  39     "--end", "start + 1000 min",
  40     "--interlace",
  41     "--imgformat", "PNG",
  42     "--width=450",
  43     "DEF:a=#{rrd}:a:AVERAGE",
  44     "DEF:b=#{rrd}:b:AVERAGE",
  45     "CDEF:line=TIME,2400,%,300,LT,a,UNKN,IF",
  46     "AREA:b#00b6e4:beta",
  47     "AREA:line#0022e9:alpha",
  48     "LINE3:line#ff0000")
  49 puts
  50
  51 print "This script has created #{name}.png in the current directory\n";
  52 print "This demonstrates the use of the TIME and % RPN operators\n";