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contrib-munin/plugins/other/varnish_cachehitratio

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2010-05-25 09:48:10 +02:00
#! /usr/bin/perl
# Varnish cache hit ratio logger/plugin
# anders@fupp.net, 2007-09-19
# Log/data file
# These must have write permission to the user the plugin runs as
# On FreeBSD, that is nobody
# Comment $mylog out to skip logging
# Set to 1 if you want to show unknown requsts (client requests which are
# neither hits nor misses):
$showunknown = 1;
$mydat = "/var/tmp/varnish_cachehitratio.dat";
#$mylog = "/var/log/varnish_cachehitratio.log";
%stat = ();
$ENV{PATH} = "/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin";
open(VV, "varnishstat -V 2>&1 |");
while (<VV>) {
if (/^varnishstat/) { $vversion = $_; }
}
close(VV);
chomp($vversion);
$vversion =~ s@varnishstat\s*@@;
$vversion =~ s@\(@@;
$vversion =~ s@\)@@;
$vversion =~ s@varnish-@@;
use Date::Format;
sub popstat10 {
foreach $line (`varnishstat -1`) {
chomp($line);
if ($line =~ /^\s+(\d+)\s+(.*)$/) {
$val = $1;
$key = $2;
$key =~ s@\s@_@g;
$key =~ tr@A-Z@a-z@;
$stat{"$key"} = $val;
}
}
}
sub popstat {
foreach $line (`varnishstat -1`) {
chomp($line);
if ($line =~ /^\w+\s+(\d+)\s+[\d\.]+\s+(.*)$/) {
$val = $1;
$key = $2;
$key =~ s@\s@_@g;
$key =~ tr@A-Z@a-z@;
$stat{"$key"} = $val;
}
}
}
sub printconfig {
print "graph_title Cache hit/miss ratio\n";
print "graph_args --upper-limit 100 -l 0\n";
print "graph_vlabel % of requests\n";
print "graph_category varnish\n";
print "graph_info This graph shows the ratio of requests found in the cache and not\n";
if ($showunknown) {
print "graph_order hitratio missratio unknownratio\n";
} else {
print "graph_order hitratio missratio\n";
}
print "graph_scale no\n";
print "hitratio.label hits\n";
print "hitratio.type GAUGE\n";
print "hitratio.graph yes\n";
print "hitratio.min 0\n";
print "hitratio.max 100\n";
print "hitratio.draw AREA\n";
print "missratio.label misses\n";
print "missratio.type GAUGE\n";
print "missratio.graph yes\n";
print "missratio.min 0\n";
print "missratio.max 100\n";
print "missratio.draw STACK\n";
if ($showunknown) {
print "unknownratio.label unknown\n";
print "unknownratio.type GAUGE\n";
print "unknownratio.graph yes\n";
print "unknownratio.min 0\n";
print "unknownratio.max 100\n";
print "unknownratio.draw STACK\n";
}
}
sub findvalues {
$nrequests = (defined $stat{"client_requests_received"}) ? $stat{"client_requests_received"} : 0;
$nhits = (defined $stat{"cache_hits"}) ? $stat{"cache_hits"} : 0;
$nmisses = (defined $stat{"cache_misses"}) ? $stat{"cache_misses"} : 0;
open(OVAL, $mydat);
$tmpstr = <OVAL>;
close(OVAL);
chomp($tmpstr);
($orequests,$ohits,$omisses) = split(/ /, $tmpstr, 3);
$hits = $nhits - $ohits;
$requests = $nrequests - $orequests;
$misses = $nmisses - $omisses;
}
sub printvalues {
if ($requests > 0) {
$hitratio = sprintf("%.2f", $hits / $requests * 100);
$missratio = sprintf("%.2f", $misses / $requests * 100);
} else {
# Assume cache hit ratio = 100% if requests < 0
$hitratio = sprintf("%.2f", 100);
$missratio = sprintf("%.2f", 0);
}
if ($hits > 0 || $misses > 0) {
$xhitratio = sprintf("%.2f", $hits / ($hits+$misses)*100);
$xmissratio = sprintf("%.2f", $misses / ($hits+$misses)*100);
} else {
$xhitratio = sprintf("%.2f", 100);
$xmissratio = sprintf("%.2f", 0);
}
if (($hitratio + $missratio) > 100) {
# Rounding foo, hit+miss ratio is higher than 100
$missratio = sprintf("%.2f", 100 - $hitratio);
$unknownratio = sprintf("%.2f", 0);
} else {
# Unknown = rest, hit+miss ratio is upto or 100
$unknownratio = sprintf("%.2f", 100 - ($hitratio + $missratio));
}
if ($showunknown) {
print "hitratio.value $hitratio\n";
} else {
print "hitratio.value $xhitratio\n";
}
print "missratio.value $missratio\n";
if ($showunknown) {
print "unknownratio.value $unknownratio\n";
}
if ($mylog ne "") {
open(LOG, ">>$mylog");
if ($showunknown) {
print LOG "hitratio=$hitratio missratio=$missratio unknown=$unknownratio hits=$hits misses=$misses requests=$requests [" . time2str("%Y-%m-%d %H:%M:%S", time) . "]\n";
} else {
print LOG "hitratio=$hitratio missratio=$missratio hits=$hits misses=$misses requests=$requests [" . time2str("%Y-%m-%d %H:%M:%S", time) . "]\n";
}
close(LOG);
}
}
sub writevalues {
open(OVAL, ">$mydat");
# xhitratio is hitratio considering only hits and misses, not client
# requests
print OVAL "$nrequests $nhits $nmisses $hitratio $xhitratio\n";
close(OVAL);
}
if ($ARGV[0] eq "autoconf") {
print "yes\n";
} elsif ($ARGV[0] eq "config") {
printconfig;
} else {
if ($vversion =~ /^1\.0/) {
popstat10;
} else {
popstat;
}
findvalues;
printvalues;
writevalues;
}