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Realtime graph handle snmp server caching (#10113)

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* Realtime graph handle server caching
Handle server caching more gracefully than setting the throughput to 0 Mbps

* smoother estimated interval

* don't change the graphing timescale
This commit is contained in:
Tony Murray
2019-05-01 17:02:15 -05:00
committed by Neil Lathwood
parent 554e22d927
commit d7bcd92612
2 changed files with 52 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
html/data.php
View File

@@ -30,7 +30,7 @@ if (is_numeric($_GET['id']) && ($config['allow_unauth_graphs'] || port_permitted
$out = snmp_get($device, 'ifOutOctets.'.$port['ifIndex'], '-OUqnv', 'IF-MIB');
}
$time = time();
$time = microtime(true);
printf("%lf|%s|%s\n", time(), $in, $out);
printf("%lf|%s|%s\n", $time, $in, $out);
}

74
html/graph-realtime.php
View File

@@ -57,6 +57,7 @@ $attribs['out']='fill="blue" font-family="Tahoma, Verdana, Arial, Helvetica, san
$attribs['graph_in']='fill="none" stroke="green" stroke-opacity="0.8"';
$attribs['graph_out']='fill="none" stroke="blue" stroke-opacity="0.8"';
$attribs['legend']='fill="black" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="4"';
$attribs['cachewarning']='fill="darkorange" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="4"';
$attribs['graphname']='fill="#435370" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="9"';
$attribs['hostname']='fill="#435370" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="6"';
$attribs['grid_txt']='fill="gray" font-family="Tahoma, Verdana, Arial, Helvetica, sans-serif" font-size="6"';
@@ -96,6 +97,7 @@ print('<?xml version="1.0" encoding="iso-8859-1"?>' . "\n");?>
<text id="switch_scale" x="<?php echo($width*0.48) ?>" y="11" <?php echo($attribs['switch_scale']) ?>>AutoScale (<?php echo($scale_type) ?>)</text>
<text id="datetime" x="<?php echo($width*0.33) ?>" y="5" <?php echo($attribs['legend']) ?>> </text>
<text id="graphlast" x="<?php echo($width*0.48) ?>" y="17" <?php echo($attribs['legend']) ?>>Graph shows last <?php echo($time_interval*$nb_plot) ?> seconds</text>
<text id="cachewarning" x="<?php echo($width*0.48) ?>" y="22" <?php echo($attribs['cachewarning']) ?> visibility="hidden">Caching may be in effect (<tspan id="cacheinterval">?</tspan>s)</text>
<polygon id="axis_arrow_x" <?php echo($attribs['axis']) ?> points="<?php echo($width . "," . $height) ?> <?php echo(($width-2) . "," . ($height-2)) ?> <?php echo(($width-2) . "," . $height) ?>"/>
<text id="error" x="<?php echo($width*0.5) ?>" y="<?php echo($height*0.5) ?>" visibility="hidden" <?php echo($attribs['error']) ?> text-anchor="middle"><?php echo($error_text) ?></text>
<text id="collect_initial" x="<?php echo($width*0.5) ?>" y="<?php echo($height*0.5) ?>" visibility="hidden" <?php echo($attribs['collect_initial']) ?> text-anchor="middle">Collecting initial data, please wait...</text>
@@ -151,9 +153,11 @@ var SVGDoc = null;
var last_ifin = 0;
var last_ifout = 0;
var last_ugmt = 0;
var last_real = 0;
var real_interval = 0;
var max = 0;
var plot_in = new Array();
var plot_out = new Array();
var plot_in = [];
var plot_out = [];
var max_num_points = <?php echo($nb_plot) ?>; // maximum number of plot data points
var step = <?php echo($width) ?> / max_num_points ;
@@ -207,6 +211,21 @@ function plot_data(obj) {
var diff_ifin = ifin - last_ifin;
var diff_ifout = ifout - last_ifout;
if (diff_ifin === 0 && diff_ifout === 0) {
handle_error('cachewarning');
} else {
var diff_real = ugmt - last_real;
last_real = ugmt;
if (real_interval === 0) {
if (diff_real < 10000) {
real_interval = diff_real;
}
} else {
// running average to smooth out the numbers a bit
real_interval = (diff_real + real_interval) / 2;
}
}
if (diff_ugmt == 0)
diff_ugmt = 1; /* avoid division by zero */
@@ -226,28 +245,26 @@ function plot_data(obj) {
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) {
plot_in[i] = plot_in[i+1];
plot_out[i] = plot_out[++i];
}
plot_in.length--;
plot_out.length--;
plot_in.shift();
plot_out.shift();
}
plot_in[plot_in.length] = diff_ifin / diff_ugmt;
plot_out[plot_out.length]= diff_ifout / diff_ugmt;
var index_plot = plot_in.length - 1;
var current_in = diff_ifin / diff_ugmt;
var current_out = diff_ifout / diff_ugmt;
plot_in.push(current_in);
plot_out.push(current_out);
SVGDoc.getElementById('graph_in_txt').firstChild.data = formatSpeed(plot_in[index_plot], unit);
SVGDoc.getElementById('graph_out_txt').firstChild.data = formatSpeed(plot_out[index_plot], unit);
if (current_in !== 0 && current_out !== 0) {
SVGDoc.getElementById('graph_in_txt').firstChild.data = formatSpeed(current_in, unit);
SVGDoc.getElementById('graph_out_txt').firstChild.data = formatSpeed(current_out, unit);
}
/* determine peak for sensible scaling */
if (scale_type == 'up') {
if (plot_in[index_plot] > max)
max = plot_in[index_plot];
if (plot_out[index_plot] > max)
max = plot_out[index_plot];
if (current_in > max)
max = current_in;
if (current_out > max)
max = current_out;
}
else if (scale_type == 'follow') {
i = 0;
@@ -304,10 +321,12 @@ function plot_data(obj) {
for (i = 1; i < plot_in.length; i++)
{
var x = step * i;
var y_in = <?php echo($height) ?> - (plot_in[i] * scale);
var y_out = <?php echo($height) ?> - (plot_out[i] * scale);
path_in += " L" + x + " " + y_in;
path_out += " L" + x + " " + y_out;
if (plot_in[i] !== 0 && plot_out[i] !== 0) {
var y_in = <?php echo($height) ?> - (plot_in[i] * scale);
var y_out = <?php echo($height) ?> - (plot_out[i] * scale);
path_in += " L" + x + " " + y_in;
path_out += " L" + x + " " + y_out;
}
}
SVGDoc.getElementById('error').setAttributeNS(null, 'visibility', 'hidden');
@@ -317,8 +336,15 @@ function plot_data(obj) {
setTimeout('fetch_data()',<?php echo(1000*$time_interval) ?>);
}
function handle_error() {
SVGDoc.getElementById("error").setAttributeNS(null, 'visibility', 'visible');
function handle_error(type) {
if (type === 'cachewarning') {
SVGDoc.getElementById("cachewarning").setAttributeNS(null, 'visibility', 'visible');
if (real_interval !== 0) {
SVGDoc.getElementById('cacheinterval').firstChild.data = Math.round(real_interval);
}
} else {
SVGDoc.getElementById("error").setAttributeNS(null, 'visibility', 'visible');
}
setTimeout('fetch_data()',<?php echo(1000*$time_interval) ?>);
}