luci/modules/luci-mod-admin-full/luasrc/view/admin_status/load.htm

<%#
 Copyright 2010 Jo-Philipp Wich <jow@openwrt.org>
 Licensed to the public under the Apache License 2.0.
-%>

<%+header%>

<script type="text/javascript" src="<%=resource%>/cbi.js"></script>
<script type="text/javascript">//<![CDATA[
	var bwxhr = new XHR();

	var G;
	var TIME = 0;
	var L01   = 1;
	var L05   = 2;
	var L15  = 3;

	var width  = 760;
	var height = 300;
	var step   = 5;

	var data_wanted = Math.floor(width / step);
	var data_fill   = 0;
	var data_stamp  = 0;

	var data_01  = [ ];
	var data_05  = [ ];
	var data_15 = [ ];

	var line_01;
	var line_05;
	var line_15;

	var label_25;
	var label_050;
	var label_75;

	var label_01_cur;
	var label_01_avg;
	var label_01_peak;

	var label_05_cur;
	var label_05_avg;
	var label_05_peak;

	var label_15_cur;
	var label_15_avg;
	var label_15_peak;

	var label_scale;


	/* wait for SVG */
	window.setTimeout(
		function() {
			var svg = document.getElementById('bwsvg');

			try {
				G = svg.getSVGDocument
					? svg.getSVGDocument() : svg.contentDocument;
			}
			catch(e) {
				G = document.embeds['bwsvg'].getSVGDocument();
			}

			if (!G)
			{
				window.setTimeout(arguments.callee, 1000);
			}
			else
			{
				/* find sizes */
				width       = svg.offsetWidth  - 2;
				height      = svg.offsetHeight - 2;
				data_wanted = Math.ceil(width / step);

				/* prefill datasets */
				for (var i = 0; i < data_wanted; i++)
				{
					data_01[i] = 0;
					data_05[i] = 0;
					data_15[i] = 0;
				}

				/* find svg elements */
				line_01 = G.getElementById('load01');
				line_05 = G.getElementById('load05');
				line_15 = G.getElementById('load15');

				label_25 = G.getElementById('label_25');
				label_50 = G.getElementById('label_50');
				label_75 = G.getElementById('label_75');

				label_01_cur  = document.getElementById('lb_load01_cur');
				label_01_avg  = document.getElementById('lb_load01_avg');
				label_01_peak = document.getElementById('lb_load01_peak');

				label_05_cur  = document.getElementById('lb_load05_cur');
				label_05_avg  = document.getElementById('lb_load05_avg');
				label_05_peak = document.getElementById('lb_load05_peak');

				label_15_cur  = document.getElementById('lb_load15_cur');
				label_15_avg  = document.getElementById('lb_load15_avg');
				label_15_peak = document.getElementById('lb_load15_peak');

				label_scale   = document.getElementById('scale');


				/* plot horizontal time interval lines */
				for (var i = width % (step * 60); i < width; i += step * 60)
				{
					var line = G.createElementNS('http://www.w3.org/2000/svg', 'line');
						line.setAttribute('x1', i);
						line.setAttribute('y1', 0);
						line.setAttribute('x2', i);
						line.setAttribute('y2', '100%');
						line.setAttribute('style', 'stroke:black;stroke-width:0.1');

					var text = G.createElementNS('http://www.w3.org/2000/svg', 'text');
						text.setAttribute('x', i + 5);
						text.setAttribute('y', 15);
						text.setAttribute('style', 'fill:#999999; font-size:9pt');
						text.appendChild(G.createTextNode(Math.round((width - i) / step / 60) + 'm'));

					label_25.parentNode.appendChild(line);
					label_25.parentNode.appendChild(text);
				}

				label_scale.innerHTML = String.format('<%:(%d minute window, %d second interval)%>', data_wanted / 60, 3);

				/* render datasets, start update interval */
				XHR.poll(3, '<%=build_url("admin/status/realtime/load_status")%>', null,
					function(x, data)
					{
						var data_max   = 0;
						var data_scale = 0;

						var data_01_avg = 0;
						var data_05_avg = 0;
						var data_15_avg = 0;

						var data_01_peak = 0;
						var data_05_peak = 0;
						var data_15_peak = 0;

						for (var i = data_stamp ? 0 : 1; i < data.length; i++)
						{
							/* skip overlapping entries */
							if (data[i][TIME] <= data_stamp)
								continue;

							data_01.push(data[i][L01]);
							data_05.push(data[i][L05]);
							data_15.push(data[i][L15]);
						}

						/* cut off outdated entries */
						data_01 = data_01.slice(data_01.length - data_wanted, data_01.length);
						data_05 = data_05.slice(data_05.length - data_wanted, data_05.length);
						data_15 = data_15.slice(data_15.length - data_wanted, data_15.length);

						/* find peak */
						for (var i = 0; i < data_01.length; i++)
						{
							data_max = Math.max(data_max, data_01[i]);
							data_max = Math.max(data_max, data_05[i]);
							data_max = Math.max(data_max, data_15[i]);

							data_01_peak = Math.max(data_01_peak, data_01[i]);
							data_05_peak = Math.max(data_05_peak, data_05[i]);
							data_15_peak = Math.max(data_15_peak, data_15[i]);

							if (i > 0)
							{
								data_01_avg = (data_01_avg + data_01[i]) / 2;
								data_05_avg = (data_05_avg + data_05[i]) / 2;
								data_15_avg = (data_15_avg + data_15[i]) / 2;
							}
							else
							{
								data_01_avg = data_01[i];
								data_05_avg = data_05[i];
								data_15_avg = data_15[i];
							}
						}

						/* remember current timestamp, calculate horizontal scale */
						data_stamp = data[data.length-1][TIME];
						data_scale = height / (data_max * 1.1);


						/* plot data */
						var pt_01 = '0,' + height;
						var pt_05 = '0,' + height;
						var pt_15 = '0,' + height;

						var y_01 = 0;
						var y_05 = 0;
						var y_15 = 0;

						for (var i = 0; i < data_01.length; i++)
						{
							var x = i * step;

							y_01 = height - Math.floor(data_01[i] * data_scale);
							y_05 = height - Math.floor(data_05[i] * data_scale);
							y_15 = height - Math.floor(data_15[i] * data_scale);

							pt_01 += ' ' + x + ',' + y_01;
							pt_05 += ' ' + x + ',' + y_05;
							pt_15 += ' ' + x + ',' + y_15;
						}

						pt_01 += ' ' + width + ',' + y_01 + ' ' + width + ',' + height;
						pt_05 += ' ' + width + ',' + y_05 + ' ' + width + ',' + height;
						pt_15 += ' ' + width + ',' + y_15 + ' ' + width + ',' + height;


						line_01.setAttribute('points', pt_01);
						line_05.setAttribute('points', pt_05);
						line_15.setAttribute('points', pt_15);

						label_25.firstChild.data = (1.1 * 0.25 * data_max / 100).toFixed(2);
						label_50.firstChild.data = (1.1 * 0.50 * data_max / 100).toFixed(2);
						label_75.firstChild.data = (1.1 * 0.75 * data_max / 100).toFixed(2);

						label_01_cur.innerHTML = (data_01[data_01.length-1] / 100).toFixed(2);
						label_05_cur.innerHTML = (data_05[data_05.length-1] / 100).toFixed(2);
						label_15_cur.innerHTML = (data_15[data_15.length-1] / 100).toFixed(2);

						label_01_avg.innerHTML = (data_01_avg / 100).toFixed(2);
						label_05_avg.innerHTML = (data_05_avg / 100).toFixed(2);
						label_15_avg.innerHTML = (data_15_avg / 100).toFixed(2);

						label_01_peak.innerHTML = (data_01_peak / 100).toFixed(2);
						label_05_peak.innerHTML = (data_05_peak / 100).toFixed(2);
						label_15_peak.innerHTML = (data_15_peak / 100).toFixed(2);
					}
				);
			}
		}, 1000
	);
//]]></script>

<h2><a id="content" name="content"><%:Realtime Load%></a></h2>

<embed id="bwsvg" style="width:100%; height:300px; border:1px solid #000000; background-color:#FFFFFF" src="<%=resource%>/load.svg" />
<div style="text-align:right"><small id="scale">-</small></div>
<br />

<table style="width:100%; table-layout:fixed" cellspacing="5">
	<tr>
		<td style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid #ff0000; white-space:nowrap"><%:1 Minute Load:%></strong></td>
		<td id="lb_load01_cur">0</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></td>
		<td id="lb_load01_avg">0</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></td>
		<td id="lb_load01_peak">0</td>
	</tr>
	<tr>
		<td style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid #ff6600; white-space:nowrap"><%:5 Minute Load:%></strong></td>
		<td id="lb_load05_cur">0</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></td>
		<td id="lb_load05_avg">0</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></td>
		<td id="lb_load05_peak">0</td>
	</tr>
	<tr>
		<td style="text-align:right; vertical-align:top"><strong style="border-bottom:2px solid #ffaa00; white-space:nowrap"><%:15 Minute Load:%></strong></td>
		<td id="lb_load15_cur">0</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Average:%></strong></td>
		<td id="lb_load15_avg">0</td>

		<td style="text-align:right; vertical-align:top"><strong><%:Peak:%></strong></td>
		<td id="lb_load15_peak">0</td>
	</tr>
</table>

<%+footer%>