luci-app-statistics: Add initial support for chrony

Add initial support for chrony statistics.
At this point introduce time offset and stratum stats.

There is something strange with the host option.
Anything else than 'localhost' or '127.0.0.1' causes an error at
collectd start, even when /tmp/collectd/conf is directly edited

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

applications/luci-app-statistics/htdocs/luci-static/resources/statistics/rrdtool/definitions/chrony.js

@@ -0,0 +1,61 @@
+/* Licensed to the public under the Apache License 2.0. */
+
+'use strict';
+'require baseclass';
+'require uci';
+
+return baseclass.extend({
+	title: _('Chrony'),
+
+	rrdargs: function(graph, host, plugin, plugin_instance, dtype) {
+		var offset = {
+			title: "%H: Chrony - time offset",
+			vlabel: "Time offset (ms)",
+			number_format: "%9.3lf ms",
+			data: {
+				types: [ "time_offset" ],
+				options: {
+					time_offset_chrony: {
+						noarea: true,
+						overlay: true,
+						color: "ff0000",
+						title: "%di",
+						transform_rpn: "1000,*"
+					},
+					time_offset: {
+						noarea: true,
+						overlay: true,
+						title: "%di",
+						transform_rpn: "1000,*"
+					}
+				}
+			}
+		};
+
+		var stratum = {
+			title: "%H: Chrony - clock stratum",
+			vlabel: "Clock stratum",
+			number_format: "%3.1lf%S",
+			data: {
+				types: [ "clock_stratum" ],
+				options: {
+					clock_stratum_chrony: {
+						noarea: true,
+						overlay: true,
+						color: "ff0000",
+						title: "%di"
+					},
+					clock_stratum: {
+						noarea: true,
+						overlay: true,
+						title: "%di"
+					}
+				}
+			}
+		};
+
+		return [ offset, stratum ];
+
+	}
+});
+

applications/luci-app-statistics/htdocs/luci-static/resources/view/statistics/plugins/chrony.js

@@ -0,0 +1,34 @@
+'use strict';
+'require baseclass';
+'require form';
+
+return baseclass.extend({
+	title: _('Chrony Plugin Configuration'),
+	description: _('The chrony plugin will monitor chrony NTP server statistics'),
+
+	addFormOptions: function(s) {
+		var o;
+
+		o = s.option(form.Flag, 'enable', _('Enable this plugin'));
+
+		o = s.option(form.Value, 'Host', _('Host running chrony'),
+			_('Possibly bug in collectd. Only 127.0.0.1 and localhost work'));
+		o.default = '127.0.0.1';
+		o.datatype = 'or(hostname,ipaddr("nomask"))';
+		o.depends('enable', '1');
+
+		o = s.option(form.Value, 'Port', _('Port for chronyd'));
+		o.default = '323';
+		o.datatype = 'port';
+		o.depends('enable', '1');
+
+		o = s.option(form.Value, 'Timeout', _('Timeout for polling chrony'), _('Seconds'));
+		o.default = '2';
+		o.datatype = 'range(0, 255)';
+		o.depends('enable', '1');
+	},
+
+	configSummary: function(section) {
+		return _('Chrony monitoring enabled');
+	}
+});

applications/luci-app-statistics/root/etc/config/luci_statistics

@@ -59,6 +59,12 @@ config statistics 'collectd_apcups'
 	option Host 'localhost'
 	option Port '3551'
 
+config statistics 'collectd_chrony'
+	option enable '0'
+	option Host '127.0.0.1'
+	option Port '323'
+	option Timeout '2'
+
 config statistics 'collectd_conntrack'
 	option enable '0'
 

applications/luci-app-statistics/root/usr/share/luci/statistics/plugins/chrony.json

@@ -0,0 +1,9 @@
+{
+	"title": "Chrony",
+	"category": "network",
+	"legend": [
+		["Host", "Port", "Timeout"],
+		[],
+		[]
+	]
+}