2 local rrd = require 'rrd'
4 local name = 'test.rrd'
5 local start = 300 * math.floor(os.time() / 300)
7 io.write('\n-- Creating ', name, '\n')
14 'RRA:AVERAGE:0.5:1:300')
17 for t=start, start+300*300, 300 do
18 local s = string.format('%d:%d:%f', t,
19 math.random(100), math.sin(t/800)*50+50)
21 num_points = num_points + 1
24 io.write('rrd file created with ', num_points, ' points, from ', start,
25 ' to ', start+300*300, '\n')
27 io.write('\n-- Testing rrd.info\n')
28 local info = rrd.info(name)
29 for k,v in pairs(info) do
30 io.write(k, '=', v, '\n')
34 io.write('-- Testing rrd.fetch\n')
35 io.write('fetching data from ', name, ' - interval: ', start, ' to ',
37 local fstart, fstep, fnames, fdata =
38 rrd.fetch(name, '--start', start, '--end', start+300*300+10, 'AVERAGE')
39 io.write('got ', table.getn(fdata[1]), ' data sources with ', table.getn(fdata),
40 ' data points each.\n')
42 io.write('\n-- Printing fetched data\n')
44 for i, n in ipairs(fnames) do
48 for i, v in ipairs(fdata) do
49 local time = fstart + (i-1)*fstep
50 io.write(string.format('%s (%d): ', os.date('%c', time), time))
51 for _, w in ipairs(v) do
52 io.write(string.format('%e ', w))
58 io.write('\n-- Testing rrd.graphv - creates test.png and returns values\n')
61 '--title', 'Enjoy Lua RRDtool module!',
62 '--start', start+3600,
63 '--end', 'start + 1000 min',
67 'DEF:a=' .. name .. ':a:AVERAGE',
68 'DEF:b=' .. name .. ':b:AVERAGE',
69 'CDEF:line=TIME,2400,%,300,LT,a,UNKN,IF',
71 'AREA:line#0022e9:alpha',
78 io.write('\n-- Returned values:\n')
79 io.write('print[0]: ', t['print[0]'], '\n')
80 io.write('print[1]: ', t['print[1]'], '\n')
81 for k, v in pairs(t) do
82 if not string.find(k, '^print%[%d+%]') then
83 io.write(k, ': ', v, '\n')
88 io.write('-- The graph "test.png" was created.\n')
89 io.write('-- Use your preferred viewer to display it.\n\n')