conky-config/drawing/ReadWrite.lua

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local Util = require 'Util'
local Common = require 'Common'
local Geometry = require 'Geometry'
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return function(update_freq)
local PLOT_SEC_BREAK = 20
local PLOT_HEIGHT = 56
local DEVICES = {'sda', 'nvme0n1'}
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-- the sector size of any block device in linux is 512 bytes
-- see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/linux/types.h?id=v4.4-rc6#n121
local BLOCK_SIZE_BYTES = 512
-- fields 3 and 7 (sectors read and written)
local RW_REGEX = '%s+%d+%s+%d+%s+(%d+)%s+%d+%s+%d+%s+%d+%s+(%d+)'
local __tonumber = tonumber
local __string_match = string.match
local __math_floor = math.floor
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-----------------------------------------------------------------------------
-- header
local header = Common.Header(
Geometry.CENTER_LEFT_X,
Geometry.TOP_Y,
Geometry.SECTION_WIDTH,
'INPUT / OUTPUT'
)
-----------------------------------------------------------------------------
-- reads
local io_label_function = function(bytes)
local new_unit, new_value = Util.convert_data_val(bytes)
return __math_floor(new_value)..' '..new_unit..'B/s'
end
local format_value_function = function(bps)
local unit, value = Util.convert_data_val(bps)
return Util.precision_round_to_string(value, 3)..' '..unit..'B/s'
end
local build_plot = function(y, label)
return Common.initLabeledScalePlot(
Geometry.CENTER_LEFT_X,
y,
Geometry.SECTION_WIDTH,
PLOT_HEIGHT,
format_value_function,
io_label_function,
PLOT_SEC_BREAK,
label,
2,
update_freq
)
end
local reads = build_plot(header.bottom_y, 'Reads')
-----------------------------------------------------------------------------
-- writes
local writes = build_plot(
header.bottom_y + PLOT_HEIGHT + PLOT_SEC_BREAK * 2,
'Writes'
)
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-----------------------------------------------------------------------------
-- update function
local DEVICE_PATHS = {}
for i = 1, #DEVICES do
DEVICE_PATHS[i] = string.format('/sys/block/%s/stat', DEVICES[i])
end
local read_devices = function()
local read_bytes = 0
local write_bytes = 0
for _, path in pairs(DEVICE_PATHS) do
local r, w = __string_match(Util.read_file(path), RW_REGEX)
read_bytes = read_bytes + __tonumber(r)
write_bytes = write_bytes + __tonumber(w)
end
return read_bytes * BLOCK_SIZE_BYTES, write_bytes * BLOCK_SIZE_BYTES
end
local prev_read_bytes, prev_write_bytes = read_devices()
local compute_rate = function(x0, x1)
-- mask overflow
if x1 > x0 then
return (x1 - x0) * update_freq
else
return 0
end
end
local update = function(cr)
local read_bytes, write_bytes = read_devices()
Common.annotated_scale_plot_set(
reads,
cr,
compute_rate(prev_read_bytes, read_bytes)
)
Common.annotated_scale_plot_set(
writes,
cr,
compute_rate(prev_write_bytes, write_bytes)
)
prev_read_bytes = read_bytes
prev_write_bytes = write_bytes
end
-----------------------------------------------------------------------------
-- main drawing functions
local draw_static = function(cr)
Common.drawHeader(cr, header)
Common.annotated_scale_plot_draw_static(reads, cr)
Common.annotated_scale_plot_draw_static(writes, cr)
end
local draw_dynamic = function(cr)
update(cr)
Common.annotated_scale_plot_draw_dynamic(reads, cr)
Common.annotated_scale_plot_draw_dynamic(writes, cr)
end
return {static = draw_static, dynamic = draw_dynamic}
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end