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---------------------------------------------------
-- Licensed under the GNU General Public License v2
-- * (c) 2009, Adrian C. <anrxc@sysphere.org>
---------------------------------------------------
-- {{{ Grab environment
local ipairs = ipairs
local io = { open = io.open }
local setmetatable = setmetatable
local math = { floor = math.floor }
local table = { insert = table.insert }
local string = {
match = string.match,
gmatch = string.gmatch
}
-- }}}
-- Disk I/O: provides I/O statistics for requested storage devices
module("vicious.dio")
-- Initialise function tables
local disk_usage = {}
local disk_total = {}
-- {{{ Disk I/O widget type
local function worker(format, disk)
-- Get /proc/diskstats
local f = io.open("/proc/diskstats")
local disk_lines = {}
for line in f:lines() do
if string.match(line, "("..disk..")%s") then
-- Todo: find a way to do this
--for stat in string.gmatch(line, "%s([%d]+)") do
-- table.insert(disk_lines, stat)
--end
--
-- Skip first two matches
local stat = string.gmatch(line, "%s([%d]+)")
stat()
stat()
-- Store the rest
for i = 1, 11 do
table.insert(disk_lines, stat())
end
end
end
f:close()
-- Ensure tables are initialized correctly
while #disk_total < #disk_lines do
table.insert(disk_total, 0)
end
local diff_total = {}
for i, v in ipairs(disk_lines) do
-- Diskstats are absolute, substract our last reading
diff_total[i] = v - disk_total[i]
-- Store totals
disk_total[i] = v
end
-- Calculate I/O
disk_usage["{raw}"] = diff_total[7] + diff_total[3]
-- Divide "sectors read" by 2 and 1024 to get KB and MB
disk_usage["{kb}"] = math.floor(diff_total[7] + diff_total[3])/2
disk_usage["{mb}"] = math.floor(diff_total[7] + diff_total[3])/1024
return disk_usage
end
-- }}}
setmetatable(_M, { __call = function(_, ...) return worker(...) end })
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