74 lines
2.2 KiB
Lua
74 lines
2.2 KiB
Lua
---------------------------------------------------
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-- Licensed under the GNU General Public License v2
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-- * (c) 2010, Adrian C. <anrxc@sysphere.org>
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---------------------------------------------------
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-- {{{ Grab environment
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local ipairs = ipairs
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local setmetatable = setmetatable
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local table = { insert = table.insert }
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local string = { gmatch = string.gmatch }
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local helpers = require("vicious.helpers")
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-- }}}
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-- Disk I/O: provides I/O statistics for requested storage devices
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-- vicious.contrib.dio
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local dio = {}
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-- Initialize function tables
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local disk_usage = {}
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local disk_total = {}
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-- Variable definitions
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local unit = { ["s"] = 1, ["kb"] = 2, ["mb"] = 2048 }
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-- {{{ Disk I/O widget type
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local function worker(format, disk)
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if not disk then return end
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local disk_lines = { [disk] = {} }
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local disk_stats = helpers.pathtotable("/sys/block/" .. disk)
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if disk_stats.stat then
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local match = string.gmatch(disk_stats.stat, "[%s]+([%d]+)")
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for i = 1, 11 do -- Store disk stats
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table.insert(disk_lines[disk], match())
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end
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end
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-- Ensure tables are initialized correctly
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local diff_total = { [disk] = {} }
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if not disk_total[disk] then
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disk_usage[disk] = {}
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disk_total[disk] = {}
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while #disk_total[disk] < #disk_lines[disk] do
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table.insert(disk_total[disk], 0)
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end
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end
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for i, v in ipairs(disk_lines[disk]) do
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-- Diskstats are absolute, substract our last reading
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diff_total[disk][i] = v - disk_total[disk][i]
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-- Store totals
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disk_total[disk][i] = v
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end
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-- Calculate and store I/O
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helpers.uformat(disk_usage[disk], "read", diff_total[disk][3], unit)
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helpers.uformat(disk_usage[disk], "write", diff_total[disk][7], unit)
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helpers.uformat(disk_usage[disk], "total", diff_total[disk][7] + diff_total[disk][3], unit)
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-- Store I/O scheduler
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if disk_stats.queue and disk_stats.queue.scheduler then
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disk_usage[disk]["{sched}"] = string.gmatch(disk_stats.queue.scheduler, "%[([%a]+)%]")
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end
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return disk_usage[disk]
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end
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-- }}}
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return setmetatable(dio, { __call = function(_, ...) return worker(...) end })
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