--- /dev/null
+#!/usr/bin/lua
+
+-- Metrics web server
+
+-- Copyright (c) 2016 Jeff Schornick <jeff@schornick.org>
+-- Copyright (c) 2015 Kevin Lyda
+-- Licensed under the Apache License, Version 2.0
+
+socket = require("socket")
+
+-- Allow us to call unpack under both lua5.1 and lua5.2+
+local unpack = unpack or table.unpack
+
+-- This table defines the scrapers to run.
+-- Each corresponds directly to a scraper_<name> function.
+scrapers = { "cpu", "load_averages", "memory", "file_handles", "network",
+ "network_devices", "time", "uname", "nat", "wifi"}
+
+-- Parsing
+
+function space_split(s)
+ elements = {}
+ for element in s:gmatch("%S+") do
+ table.insert(elements, element)
+ end
+ return elements
+end
+
+function line_split(s)
+ elements = {}
+ for element in s:gmatch("[^\n]+") do
+ table.insert(elements, element)
+ end
+ return elements
+end
+
+function get_contents(filename)
+ local f = io.open(filename, "rb")
+ local contents = ""
+ if f then
+ contents = f:read "*a"
+ f:close()
+ end
+
+ return contents
+end
+
+-- Metric printing
+
+function print_metric(metric, labels, value)
+ 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
+ output(string.format("%s%s %s", metric, label_string, value))
+end
+
+function metric(name, mtype, labels, value)
+ output("# TYPE " .. name .. " " .. mtype)
+ local outputter = function(labels, value)
+ print_metric(name, labels, value)
+ end
+ if value then
+ outputter(labels, value)
+ end
+ return outputter
+end
+
+function scraper_wifi()
+ local rv = { }
+ local ntm = require "luci.model.network".init()
+
+ local metric_wifi_network_up = metric("wifi_network_up","gauge")
+ local metric_wifi_network_quality = metric("wifi_network_quality","gauge")
+ local metric_wifi_network_bitrate = metric("wifi_network_bitrate","gauge")
+ local metric_wifi_network_noise = metric("wifi_network_noise","gauge")
+ local metric_wifi_network_signal = metric("wifi_network_signal","gauge")
+
+ local metric_wifi_station_signal = metric("wifi_station_signal","gauge")
+ local metric_wifi_station_tx_packets = metric("wifi_station_tx_packets","gauge")
+ local metric_wifi_station_rx_packets = metric("wifi_station_rx_packets","gauge")
+
+ local dev
+ for _, dev in ipairs(ntm:get_wifidevs()) do
+ local rd = {
+ up = dev:is_up(),
+ device = dev:name(),
+ name = dev:get_i18n(),
+ networks = { }
+ }
+
+ local net
+ for _, net in ipairs(dev:get_wifinets()) do
+ local labels = {
+ channel = net:channel(),
+ ssid = net:active_ssid(),
+ bssid = net:active_bssid(),
+ mode = net:active_mode(),
+ ifname = net:ifname(),
+ country = net:country(),
+ frequency = net:frequency(),
+ }
+ if net:is_up() then
+ metric_wifi_network_up(labels, 1)
+ local signal = net:signal_percent()
+ if signal ~= 0 then
+ metric_wifi_network_quality(labels, net:signal_percent())
+ end
+ metric_wifi_network_noise(labels, net:noise())
+ local bitrate = net:bitrate()
+ if bitrate then
+ metric_wifi_network_bitrate(labels, bitrate)
+ end
+
+ local assoclist = net:assoclist()
+ for mac, station in pairs(assoclist) do
+ local labels = {
+ ifname = net:ifname(),
+ mac = mac,
+ }
+ metric_wifi_station_signal(labels, station.signal)
+ metric_wifi_station_tx_packets(labels, station.tx_packets)
+ metric_wifi_station_rx_packets(labels, station.rx_packets)
+ end
+ else
+ metric_wifi_network_up(labels, 0)
+ end
+ end
+ rv[#rv+1] = rd
+ end
+end
+
+function scraper_cpu()
+ local stat = get_contents("/proc/stat")
+
+ -- system boot time, seconds since epoch
+ metric("node_boot_time", "gauge", nil, string.match(stat, "btime ([0-9]+)"))
+
+ -- context switches since boot (all CPUs)
+ metric("node_context_switches", "counter", nil, string.match(stat, "ctxt ([0-9]+)"))
+
+ -- cpu times, per CPU, per mode
+ local cpu_mode = {"user", "nice", "system", "idle", "iowait", "irq",
+ "softirq", "steal", "guest", "guest_nice"}
+ local i = 0
+ local cpu_metric = metric("node_cpu", "counter")
+ while string.match(stat, string.format("cpu%d ", i)) do
+ local cpu = space_split(string.match(stat, string.format("cpu%d ([0-9 ]+)", i)))
+ local labels = {cpu = "cpu" .. i}
+ for ii, mode in ipairs(cpu_mode) do
+ labels['mode'] = mode
+ cpu_metric(labels, cpu[ii] / 100)
+ end
+ i = i + 1
+ end
+
+ -- interrupts served
+ metric("node_intr", "counter", nil, string.match(stat, "intr ([0-9]+)"))
+
+ -- processes forked
+ metric("node_forks", "counter", nil, string.match(stat, "processes ([0-9]+)"))
+
+ -- processes running
+ metric("node_procs_running", "gauge", nil, string.match(stat, "procs_running ([0-9]+)"))
+
+ -- processes blocked for I/O
+ metric("node_procs_blocked", "gauge", nil, string.match(stat, "procs_blocked ([0-9]+)"))
+end
+
+function scraper_load_averages()
+ local loadavg = space_split(get_contents("/proc/loadavg"))
+
+ metric("node_load1", "gauge", nil, loadavg[1])
+ metric("node_load5", "gauge", nil, loadavg[2])
+ metric("node_load15", "gauge", nil, loadavg[3])
+end
+
+function scraper_memory()
+ local meminfo = line_split(get_contents("/proc/meminfo"):gsub("[):]", ""):gsub("[(]", "_"))
+
+ for i, mi in ipairs(meminfo) do
+ local name, size, unit = unpack(space_split(mi))
+ if unit == 'kB' then
+ size = size * 1024
+ end
+ metric("node_memory_" .. name, "gauge", nil, size)
+ end
+end
+
+function scraper_file_handles()
+ local file_nr = space_split(get_contents("/proc/sys/fs/file-nr"))
+
+ metric("node_filefd_allocated", "gauge", nil, file_nr[1])
+ metric("node_filefd_maximum", "gauge", nil, file_nr[3])
+end
+
+function scraper_network()
+ -- NOTE: Both of these are missing in OpenWRT kernels.
+ -- See: https://dev.openwrt.org/ticket/15781
+ local netstat = get_contents("/proc/net/netstat") .. get_contents("/proc/net/snmp")
+
+ -- all devices
+ local netsubstat = {"IcmpMsg", "Icmp", "IpExt", "Ip", "TcpExt", "Tcp", "UdpLite", "Udp"}
+ for i, nss in ipairs(netsubstat) do
+ local substat_s = string.match(netstat, nss .. ": ([A-Z][A-Za-z0-9 ]+)")
+ if substat_s then
+ local substat = space_split(substat_s)
+ local substatv = space_split(string.match(netstat, nss .. ": ([0-9 -]+)"))
+ for ii, ss in ipairs(substat) do
+ metric("node_netstat_" .. nss .. "_" .. ss, "gauge", nil, substatv[ii])
+ end
+ end
+ end
+end
+
+function scraper_network_devices()
+ local netdevstat = line_split(get_contents("/proc/net/dev"))
+ local netdevsubstat = {"receive_bytes", "receive_packets", "receive_errs",
+ "receive_drop", "receive_fifo", "receive_frame", "receive_compressed",
+ "receive_multicast", "transmit_bytes", "transmit_packets",
+ "transmit_errs", "transmit_drop", "transmit_fifo", "transmit_colls",
+ "transmit_carrier", "transmit_compressed"}
+ for i, line in ipairs(netdevstat) do
+ netdevstat[i] = string.match(netdevstat[i], "%S.*")
+ end
+ local nds_table = {}
+ local devs = {}
+ for i, nds in ipairs(netdevstat) do
+ local dev, stat_s = string.match(netdevstat[i], "([^:]+): (.*)")
+ if dev then
+ nds_table[dev] = space_split(stat_s)
+ table.insert(devs, dev)
+ end
+ end
+ for i, ndss in ipairs(netdevsubstat) do
+ netdev_metric = metric("node_network_" .. ndss, "gauge")
+ for ii, d in ipairs(devs) do
+ netdev_metric({device=d}, nds_table[d][i])
+ end
+ end
+end
+
+function scraper_time()
+ -- current time
+ metric("node_time", "counter", nil, os.time())
+end
+
+function scraper_uname()
+ -- version can have spaces, so grab it directly
+ local version = string.sub(io.popen("uname -v"):read("*a"), 1, -2)
+ -- avoid individual popen calls for the rest of the values
+ local uname_string = io.popen("uname -a"):read("*a")
+ local sysname, nodename, release = unpack(space_split(uname_string))
+ local labels = {domainname = "(none)", nodename = nodename, release = release,
+ sysname = sysname, version = version}
+
+ -- The machine hardware name is immediately after the version string, so add
+ -- up the values we know and add in the 4 spaces to find the offset...
+ machine_offset = string.len(sysname .. nodename .. release .. version) + 4
+ labels['machine'] = string.match(string.sub(uname_string, machine_offset), "(%S+)" )
+ metric("node_uname_info", "gauge", labels, 1)
+end
+
+function scraper_nat()
+ -- documetation about nf_conntrack:
+ -- https://www.frozentux.net/iptables-tutorial/chunkyhtml/x1309.html
+ -- local natstat = line_split(get_contents("/proc/net/nf_conntrack"))
+ local natstat = line_split(get_contents("nf_conntrack"))
+
+ nat_metric = metric("node_nat_traffic", "gauge" )
+ for i, e in ipairs(natstat) do
+ -- output(string.format("%s\n",e ))
+ local fields = space_split(e)
+ local src, dest, bytes;
+ bytes = 0;
+ for ii, field in ipairs(fields) do
+ if src == nil and string.match(field, '^src') then
+ src = string.match(field,"src=([^ ]+)");
+ elseif dest == nil and string.match(field, '^dst') then
+ dest = string.match(field,"dst=([^ ]+)");
+ elseif string.match(field, '^bytes') then
+ local b = string.match(field, "bytes=([^ ]+)");
+ bytes = bytes + b;
+ -- output(string.format("\t%d %s",ii,field ));
+ end
+
+ end
+ -- local src, dest, bytes = string.match(natstat[i], "src=([^ ]+) dst=([^ ]+) .- bytes=([^ ]+)");
+ -- local src, dest, bytes = string.match(natstat[i], "src=([^ ]+) dst=([^ ]+) sport=[^ ]+ dport=[^ ]+ packets=[^ ]+ bytes=([^ ]+)")
+
+ local labels = { src = src, dest = dest }
+ -- output(string.format("src=|%s| dest=|%s| bytes=|%s|", src, dest, bytes ))
+ nat_metric(labels, bytes )
+ end
+end
+
+function timed_scrape(scraper)
+ local start_time = socket.gettime()
+ -- build the function name and call it from global variable table
+ _G["scraper_"..scraper]()
+ local duration = socket.gettime() - start_time
+ return duration
+end
+
+function run_all_scrapers()
+ times = {}
+ for i,scraper in ipairs(scrapers) do
+ runtime = timed_scrape(scraper)
+ times[scraper] = runtime
+ scrape_time_sums[scraper] = scrape_time_sums[scraper] + runtime
+ scrape_counts[scraper] = scrape_counts[scraper] + 1
+ end
+
+ local name = "node_exporter_scrape_duration_seconds"
+ local duration_metric = metric(name, "summary")
+ for i,scraper in ipairs(scrapers) do
+ local labels = {collector=scraper, result="success"}
+ duration_metric(labels, times[scraper])
+ print_metric(name.."_sum", labels, scrape_time_sums[scraper])
+ print_metric(name.."_count", labels, scrape_counts[scraper])
+ end
+end
+
+-- Web server-specific functions
+
+function http_ok_header()
+ output("HTTP/1.1 200 OK\r")
+ output("Server: lua-metrics\r")
+ output("Content-Type: text/plain; version=0.0.4\r")
+ output("\r")
+end
+
+function http_not_found()
+ output("HTTP/1.1 404 Not Found\r")
+ output("Server: lua-metrics\r")
+ output("Content-Type: text/plain\r")
+ output("\r")
+ output("ERROR: File Not Found.")
+end
+
+function serve(request)
+ if not string.match(request, "GET /metrics.*") then
+ http_not_found()
+ else
+ http_ok_header()
+ run_all_scrapers()
+ end
+ client:close()
+ return true
+end
+
+-- Main program
+
+for k,v in ipairs(arg) do
+ if (v == "-p") or (v == "--port") then
+ port = arg[k+1]
+ end
+ if (v == "-b") or (v == "--bind") then
+ bind = arg[k+1]
+ end
+end
+
+scrape_counts = {}
+scrape_time_sums = {}
+for i,scraper in ipairs(scrapers) do
+ scrape_counts[scraper] = 0
+ scrape_time_sums[scraper] = 0
+end
+
+if port then
+ server = assert(socket.bind(bind, port))
+
+ while 1 do
+ client = server:accept()
+ client:settimeout(60)
+ local request, err = client:receive()
+
+ if not err then
+ output = function (str) client:send(str.."\n") end
+ if not serve(request) then
+ break
+ end
+ end
+ end
+else
+ output = print
+ run_all_scrapers()
+end
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