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#!/usr/bin/lua5.1
local sys_stat = require "posix.sys.stat"
local state_filename = '/run/prometheus-node-exporter_sensors/state'
local sensors = require "sensors"
local units = {
temperature = "celsius",
humidity = "percent",
pressure = "pascals",
gpio = "status",
}
local _typestring_printed = {}
local function metric(name, mtype, labels, value)
if nil == _typestring_printed[name] then
print("# TYPE " .. name .. " " .. mtype)
_typestring_printed[name] = 1
end
local label_string = ""
if labels then
for label,value in pairs(labels) do
label_string = label_string .. label .. '="' .. value .. '",'
end
label_string = "{" .. string.sub(label_string, 1, -2) .. "}"
end
print(string.format("%s%s %s", name, label_string, value))
end
local function scrape(config, num_sensors)
local readings, err = sensors.read(config)
if not readings then return end
metric("sensors_count_total", "gauge", nil, num_sensors)
for name, values in pairs(readings) do
labels = { name = name, kind = values._kind_ }
for t, v in pairs(values) do
local unit = units[t]
if unit ~= nil then
metric("sensors_" .. t .. "_" .. unit, "gauge", labels, v)
end
end
end
end
local function _setup(config)
local num_sensors, err = sensors.setup(config)
if num_sensors == nil then error(err) end
io.stderr:write(string.format("setup: %d sensors found.\n", num_sensors))
local f, err = io.open(state_filename, "w")
if not f then error(err) end
local ret, err = f:write(string.format("%d\n", num_sensors))
f:close()
if not ret then error(err) end
return num_sensors
end
local function setup(config)
local s, _ = sys_stat.stat(state_filename)
if s == nil then
return _setup(config)
end
local f, err = io.open(state_filename, "r")
if not f then error(err) end
local data, err = f:read("*l")
f:close()
if not data then
return _setup(config)
end
local num_sensors, err = tonumber(data)
if num_sensors == nil then
return _setup(config)
end
return num_sensors
end
function main()
local config, err = sensors.read_config('/etc/prometheus/exporter/node/sensors.json')
if config == nil then error(err) end
local num_sensors = setup(config)
scrape(config, num_sensors, units)
end
main()
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