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local fs = require "nixio.fs"
local function rtrim(s)
return string.gsub(s, "\n$", "")
end
local function scrape()
local metric_chip_names = metric("node_hwmon_chip_names", "gauge")
local metric_sensor_label = metric("node_hwmon_sensor_label", "gauge")
local metric_temp_celsius = metric("node_hwmon_temp_celsius", "gauge")
local metric_pwm = metric("node_hwmon_pwm", "gauge")
for hwmon_path in fs.glob("/sys/class/hwmon/hwmon*") do
-- Produce node_hwmon_chip_names
-- See https://github.com/prometheus/node_exporter/blob/7c564bcbeffade3dacac43b07c2eeca4957ca71d/collector/hwmon_linux.go#L415
local chip_name = rtrim(get_contents(hwmon_path .. "/name"))
if chip_name == "" then
chip_name = fs.basename(hwmon_path)
end
-- See https://github.com/prometheus/node_exporter/blob/7c564bcbeffade3dacac43b07c2eeca4957ca71d/collector/hwmon_linux.go#L355
local chip = chip_name
local real_dev_path, status = fs.realpath(hwmon_path .. "/device")
if not status then
local dev_name = fs.basename(real_dev_path)
local dev_type = fs.basename(fs.dirname(real_dev_path))
chip = dev_type .. "_" .. dev_name
end
metric_chip_names({chip=chip, chip_name=chip_name}, 1)
-- Produce node_hwmon_sensor_label
for sensor_path in fs.glob(hwmon_path .. "/*_label") do
local sensor = string.gsub(fs.basename(sensor_path), "_label$", "")
local sensor_label = rtrim(get_contents(sensor_path))
metric_sensor_label({chip=chip, sensor=sensor, label=sensor_label}, 1)
end
-- Produce node_hwmon_temp_celsius
for sensor_path in fs.glob(hwmon_path .. "/temp*_input") do
local sensor = string.gsub(fs.basename(sensor_path), "_input$", "")
local temp = get_contents(sensor_path) / 1000
metric_temp_celsius({chip=chip, sensor=sensor}, temp)
end
-- Produce node_hwmon_pwm
for sensor_path in fs.glob(hwmon_path .. "/pwm*") do
local sensor = fs.basename(sensor_path)
if string.match(sensor, "^pwm[0-9]+$") then
local pwm = rtrim(get_contents(sensor_path))
metric_pwm({chip=chip, sensor=sensor}, pwm)
end
end
end
end
return { scrape = scrape }
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