From caf695c08afc09bc62d7f5fedefb022ce275d756 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@spreadspace.org>
Date: Fri, 22 Oct 2021 22:11:15 +0200
Subject: add openwrt variant of chrony textfile collector

---
 .../openwrt/chrony_prometheus-node-exporter.lua    | 96 ++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 files/common/openwrt/chrony_prometheus-node-exporter.lua

(limited to 'files/common')

diff --git a/files/common/openwrt/chrony_prometheus-node-exporter.lua b/files/common/openwrt/chrony_prometheus-node-exporter.lua
new file mode 100644
index 00000000..30358898
--- /dev/null
+++ b/files/common/openwrt/chrony_prometheus-node-exporter.lua
@@ -0,0 +1,96 @@
+#!/usr/bin/lua
+-- this is a lua-fied version of the python script that can be found here:
+--  https://www.mail-archive.com/chrony-users@chrony.tuxfamily.org/msg02179.html
+
+local chrony_sourcestats_cmd = 'chronyc -n -c sourcestats'
+local chrony_sources_cmd = 'chronyc -n -c sources'
+local chrony_tracking_cmd = 'chronyc -n -c tracking'
+
+local status_types = {}
+status_types['x'] = 0
+status_types['?'] = 1
+status_types['-'] = 2
+status_types['+'] = 3
+status_types['*'] = 4
+
+local metrics_mode = {}
+metrics_mode['^'] = "server"
+metrics_mode['='] = "peer"
+metrics_mode['#'] = "reference clock"
+
+
+function get_cmdoutput(cmd)
+    local chrony_sourcestats, err = io.popen(cmd)
+    if err ~= nil then return nil, err end
+
+    local lines = {}
+    for line in chrony_sourcestats:lines() do table.insert(lines, line) end
+    return lines
+end
+
+function comma_split(s)
+    local elements = {}
+    for element in s:gmatch("([^,]*)") do
+        if element ~= "" then table.insert(elements, element) end
+    end
+    return elements
+end
+
+function weight(value)
+    -- the reachability value is an octal number between 0 and 255
+    -- the python script does rather complicated computations that
+    -- boil down to: value == 255 (377 oct)
+    if value == "377" then return 1 end
+    return 0
+end
+
+
+local function scrape()
+    local metric_freq = metric("chronyd_freq_ppm", "gauge")
+    local metric_freq_skew = metric("chronyd_freq_skew_ppm", "gauge")
+    local metric_std_dev = metric("chronyd_std_dev_seconds", "gauge")
+
+    local chrony_sourcestats = get_cmdoutput(chrony_sourcestats_cmd)
+    local line
+    for _, line in ipairs(chrony_sourcestats) do
+        local items = comma_split(line)
+        local labels = { remote = items[1] }
+        metric_freq(labels, tonumber(items[5]))
+        metric_freq_skew(labels, tonumber(items[6]))
+        metric_std_dev(labels, tonumber(items[8]))
+    end
+
+    local metric_peer_status = metric("chronyd_peer_status", "gauge")
+    local metric_offset_seconds = metric("chronyd_offset_seconds", "gauge")
+    local metric_peer_reachable = metric("chronyd_peer_reachable", "gauge")
+    local chrony_sources = get_cmdoutput(chrony_sources_cmd)
+    for _, line in ipairs(chrony_sources) do
+        local items = comma_split(line)
+        local common_labels = { remote = items[3] }
+        local peer_labels = { remote = items[3], stratum = tonumber(items[4]), mode = metrics_mode[items[1]] }
+        metric_peer_status(peer_labels, status_types[items[2]])
+        metric_offset_seconds(common_labels, tonumber(items[9]))
+        metric_peer_reachable(peer_labels, weight(items[6]))
+    end
+
+    print("########")
+    local chrony_tracking = get_cmdoutput(chrony_tracking_cmd)
+    for _, line in ipairs(chrony_tracking) do
+        local items = comma_split(line)
+        metric("chronyd_tracking_source", "gauge", { value = items[2]}, 1)
+        metric("chronyd_tracking_stratum", "gauge", nil, tonumber(items[3]))
+        metric("chronyd_tracking_ref_time", "gauge", nil, tonumber(items[4]))
+        metric("chronyd_tracking_system_time", "gauge", nil, tonumber(items[5]))
+        metric("chronyd_tracking_last_offset", "gauge", nil, tonumber(items[6]))
+        metric("chronyd_tracking_rms_offset", "gauge", nil, tonumber(items[7]))
+        metric("chronyd_tracking_frequency_error", "gauge", nil, tonumber(items[8]))
+        metric("chronyd_tracking_frequency_residual", "gauge", nil, tonumber(items[9]))
+        metric("chronyd_tracking_frequency_skew", "gauge", nil, tonumber(items[10]))
+        metric("chronyd_tracking_root_delay", "gauge", nil, tonumber(items[11]))
+        metric("chronyd_tracking_root_dispersion", "gauge", nil, tonumber(items[12]))
+        metric("chronyd_tracking_update_interval", "gauge", nil, tonumber(items[13]))
+        metric("chronyd_tracking_leap_status", "gauge", { value = items[14]}, 1)
+    end
+end
+
+return { scrape = scrape }
-- 
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