<?php
/*
 * graph_cpu.php
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2004-2020 Rubicon Communications, LLC (Netgate)
 * Copyright (c) 2004-2006 T. Lechat <dev@lechat.org>
 * Copyright (c) 2004-2006 Jonathan Watt <jwatt@jwatt.org>
 * All rights reserved.
 *
 * originally based on m0n0wall (http://m0n0.ch/wall)
 * Copyright (c) 2003-2004 Manuel Kasper <mk@neon1.net>.
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

##|+PRIV
##|*IDENT=page-diagnostics-cpuutilization
##|*NAME=Diagnostics: CPU Utilization
##|*DESCR=Allow access to the 'Diagnostics: CPU Utilization' page.
##|*MATCH=graph_cpu.php*
##|*MATCH=stats.php*
##|-PRIV

require_once("guiconfig.inc");

header("Last-Modified: " . gmdate("D, j M Y H:i:s") . " GMT");
header("Expires: " . gmdate("D, j M Y H:i:s", time()) . " GMT");
header("Cache-Control: no-cache, no-store, must-revalidate"); // HTTP/1.1
header("Pragma: no-cache"); // HTTP/1.0
header("Content-type: image/svg+xml");

/********* Other conf *******/

$nb_plot = 120;  // maximum number of data points to plot in the graph
$fetch_link = "stats.php?stats=cpu";

//SVG attributes
$attribs['axis']='fill="black" stroke="black"';
$attribs['cpu']='fill="#FF0000" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="7"';
$attribs['graph_cpu']='fill="none" stroke="#FF0000" stroke-opacity="0.8"';
$attribs['legend']='fill="black" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="4"';
$attribs['grid_txt']='fill="gray" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="6"';
$attribs['grid']='stroke="gray" stroke-opacity="0.5"';
$attribs['error']='fill="blue" font-family="Arial" font-size="4"';
$attribs['collect_initial']='fill="gray" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="4"';

$height=100;  // SVG internal height : do not modify
$width=200;   // SVG internal width  : do not modify

/********* Graph DATA **************/
print('<?xml version="1.0" encoding="UTF-8"?>' . "\n");?>
<svg width="100%" height="100%" viewBox="0 0 <?=$width?> <?=$height?>" preserveAspectRatio="none" xml:space="preserve" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" onload="init(evt);">
	<g id="graph">
		<rect id="bg" x1="0" y1="0" width="100%" height="100%" fill="white"/>
		<line id="axis_x" x1="0" y1="0" x2="0" y2="100%" <?=$attribs['axis']?>/>
		<line id="axis_y" x1="0" y1="100%" x2="100%" y2="100%" <?=$attribs['axis']?>/>
		<polygon id="axis_arrow_x" <?=$attribs['axis']?> points="<?=($width) . "," . ($height)?> <?=($width-2) . "," . ($height-2)?> <?=($width-2) . "," . $height?>"/>
		<path id="graph_cpu" d="" <?=$attribs['graph_cpu']?>/>
		<path id="grid" d="M0 <?=$height/4*1?> L <?=$width?> <?=$height/4*1?> M0 <?=$height/4*2?> L <?=$width?> <?=$height/4*2?> M0 <?=$height/4*3?> L <?=$width?> <?=$height/4*3?>" <?=$attribs['grid']?>/>
		<text id="grid_txt1" x="100%" y="25%" <?=$attribs['grid_txt']?> text-anchor="end">75%</text>
		<text id="grid_txt2" x="100%" y="50%" <?=$attribs['grid_txt']?> text-anchor="end">50%</text>
		<text id="grid_txt3" x="100%" y="75%" <?=$attribs['grid_txt']?> text-anchor="end">25%</text>
		<text id="graph_cpu_txt" x="4" y="8" <?=$attribs['cpu']?>> </text>
		<text id="error" x="50%" y="50%" visibility="hidden" <?=$attribs['error']?> text-anchor="middle"><?=gettext("Cannot get CPU load"); ?></text>
		<text id="collect_initial" x="50%" y="50%" visibility="hidden" <?=$attribs['collect_initial']?> text-anchor="middle"><?=gettext("Collecting initial data, please wait"); ?>...</text>
	</g>
	<script type="text/ecmascript">
		<![CDATA[

/**
 * getURL is a proprietary Adobe function, but it's simplicity has made it very
 * popular. If getURL is undefined we spin our own by wrapping XMLHttpRequest.
 */
if (typeof getURL == 'undefined') {
	getURL = function(url, callback) {
		if (!url) {
			throw '<?=gettext("No URL for getURL"); ?>';
		}

		try {
			if (typeof callback.operationComplete == 'function') {
				callback = callback.operationComplete;
			}
		} catch (e) {}
		if (typeof callback != 'function') {
			throw '<?=gettext("No callback function for getURL"); ?>';
		}

		var http_request = null;
		if (typeof XMLHttpRequest != 'undefined') {
			http_request = new XMLHttpRequest();
		} else if (typeof ActiveXObject != 'undefined') {
			try {
				http_request = new ActiveXObject('Msxml2.XMLHTTP');
			} catch (e) {
				try {
					http_request = new ActiveXObject('Microsoft.XMLHTTP');
				} catch (e) {}
			}
		}
		if (!http_request) {
			throw '<?=gettext("Both getURL and XMLHttpRequest are undefined"); ?>';
		}

		http_request.onreadystatechange = function() {
			if (http_request.readyState == 4) {
				callback( { success : true,
					content : http_request.responseText,
					contentType : http_request.getResponseHeader("Content-Type") } );
			}
		}
		http_request.open('GET', url, true);
		http_request.send(null);
	}
}

var SVGDoc = null;
var last_cpu_total = 0;
var last_cpu_idle = 0;
var diff_cpu_total = 0;
var diff_cpu_idle = 0;
var cpu_data = new Array();

var max_num_points = <?=$nb_plot?>;  // maximum number of plot data points
var step = <?=$width?> / max_num_points;  // plot X division size
var scale = <?=$height?> / 100;

function init(evt) {
	SVGDoc = evt.target.ownerDocument;
	fetch_data();
}

function fetch_data() {
	getURL('<?=$fetch_link?>', plot_cpu_data);
}

function plot_cpu_data(obj) {
	if (!obj.success) {
		return handle_error();  // getURL failed to get current CPU load data
	}

	var cpu = parseInt(obj.content);
	if (!isNumber(cpu)) {
		return handle_error();
	}

	switch (cpu_data.length) {
		case 0:
			SVGDoc.getElementById("collect_initial").setAttributeNS(null, 'visibility', 'visible');
			cpu_data[0] = cpu;
			fetch_data();
			return;
		case 1:
			SVGDoc.getElementById("collect_initial").setAttributeNS(null, 'visibility', 'hidden');
			break;
		case max_num_points:
			// shift plot to left if the maximum number of plot points has been reached
			var i = 0;
			while (i < max_num_points) {
				cpu_data[i] = cpu_data[++i];
			}
			--cpu_data.length;
	}

	cpu_data[cpu_data.length] = cpu;

	var path_data = "M 0 " + (<?=$height?> - (cpu_data[0] * scale));
	for (var i = 1; i < cpu_data.length; ++i) {
		var x = step * i;
		var y_cpu = <?=$height?> - (cpu_data[i] * scale);
		path_data += " L" + x + " " + y_cpu;
	}

	SVGDoc.getElementById("error").setAttributeNS(null, 'visibility', 'hidden');
	SVGDoc.getElementById('graph_cpu_txt').firstChild.data = cpu + '%';
	SVGDoc.getElementById('graph_cpu').setAttributeNS(null, "d", path_data);

	fetch_data();
}

function handle_error() {
	SVGDoc.getElementById("error").setAttributeNS(null, 'visibility', 'visible');
	fetch_data();
}

function isNumber(a) {
	return typeof a == 'number' && isFinite(a);
}

		]]>
	</script>
</svg>
