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 require "RRD"
   6
   7 name = "test"
   8 rrd = "#{name}.rrd"
   9 start = Time.now.to_i
  10
  11 puts "creating #{rrd}"
  12 RRD.create(
  13     rrd,
  14     "--start", "#{start - 1}",
  15     "--step", "300",
  16         "DS:a:GAUGE:600:U:U",
  17     "DS:b:GAUGE:600:U:U",
  18     "RRA:AVERAGE:0.5:1:300")
  19 puts
  20
  21 puts "updating #{rrd}"
  22 start.to_i.step(start.to_i + 300 * 300, 300) { |i|
  23     RRD.update(rrd, "#{i}:#{rand(100)}:#{Math.sin(i / 800) * 50 + 50}")
  24 }
  25 puts
  26
  27 puts "fetching data from #{rrd}"
  28 (fstart, fend, data) = RRD.fetch(rrd, "--start", start.to_s, "--end", (start + 300 * 300).to_s, "AVERAGE")
  29 puts "got #{data.length} data points from #{fstart} to #{fend}"
  30 puts
  31
  32 puts "generating graph #{name}.png"
  33 RRD.graph(
  34    "#{name}.png",
  35     "--title", " RubyRRD Demo",
  36     "--start", "#{start} + 1 h",
  37     "--end", "#{start} + 1000 min",
  38     "--interlace",
  39     "--imgformat", "PNG",
  40     "--width=450",
  41     "DEF:a=#{rrd}:a:AVERAGE",
  42     "DEF:b=#{rrd}:b:AVERAGE",
  43     "CDEF:line=TIME,2400,%,300,LT,a,UNKN,IF",
  44     "AREA:b#00b6e4:beta",
  45     "AREA:line#0022e9:alpha",
  46     "LINE3:line#ff0000")
  47 puts
  48
  49 print "This script has created #{name}.png in the current directory\n";
  50 print "This demonstrates the use of the TIME and % RPN operators\n";