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 = Time.now.to_i
  12 end_time = start_time.to_i + 300 * 300
  13
  14 puts "creating #{rrd}"
  15 RRD.create(
  16     rrd,
  17     "--start", "#{start_time - 1}",
  18     "--step", "300",
  19         "DS:a:GAUGE:600:U:U",
  20     "DS:b:GAUGE:600:U:U",
  21     "RRA:AVERAGE:0.5:1:300")
  22 puts
  23
  24 puts "updating #{rrd}"
  25 start_time.step(end_time, 300) { |i|
  26     RRD.update(rrd, "#{i}:#{rand(100)}:#{Math.sin(i / 800) * 50 + 50}")
  27 }
  28 puts
  29
  30 puts "fetching data from #{rrd}"
  31 (fstart, fend, data) = RRD.fetch(rrd, "--start", start_time.to_s, "--end", end_time.to_s, "AVERAGE")
  32 puts "got #{data.length} data points from #{fstart} to #{fend}"
  33 puts
  34
  35 puts "generating graph #{name}.png"
  36 RRD.graph(
  37    "#{name}.png",
  38     "--title", " RubyRRD Demo",
  39     "--start", "#{start_time+3600}",
  40     "--end", "start + 1000 min",
  41     "--interlace",
  42     "--imgformat", "PNG",
  43     "--width=450",
  44     "DEF:a=#{rrd}:a:AVERAGE",
  45     "DEF:b=#{rrd}:b:AVERAGE",
  46     "CDEF:line=TIME,2400,%,300,LT,a,UNKN,IF",
  47     "AREA:b#00b6e4:beta",
  48     "AREA:line#0022e9:alpha",
  49     "LINE3:line#ff0000")
  50 puts
  51
  52 # last method test
  53 if end_time != RRD.last("#{rrd}").to_i
  54     puts "last method expects #{Time.at(end_time)}."
  55     puts "                But #{RRD.last("#{rrd}")} returns."
  56 end
  57 puts
  58
  59 print "This script has created #{name}.png in the current directory\n";
  60 print "This demonstrates the use of the TIME and % RPN operators\n";