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#!@@PERL@@ -w
# -*- perl -*-
#
# Copyright (C) 2004 Dagfinn Ilmari Mannsaaker
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 dated June, 1991.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
# USA.
#
#
# Counts the number of matching log lines
#
# Parameters:
#
# config (required)
#
# Config variables:
#
# logfile - Files to grep (shellglob) (required)
# regex - Regex to look for (required)
# label - Label
# regex_<key> - Additional regexes
# label_<key> - Additional labels
# title - Graph title
#
# TODO: Handle rotated logs
#
# $Log$
# Revision 1.5 2005/01/05 16:44:02 ilmari
# Fixed typo in generic/loggrep breaking implicit labeling.
#
# Revision 1.4 2004/12/10 18:51:43 jimmyo
# linux/apt* has been forced to LANG=C, to get predictable output.
#
# Revision 1.3 2004/12/10 10:47:47 jimmyo
# Change name from ${scale} to ${graph_period}, to be more consistent.
#
# Revision 1.2 2004/12/09 22:12:54 jimmyo
# Added "graph_period" option, to make "graph_sums" usable.
#
# Revision 1.1 2004/11/20 05:59:25 ilmari
# Added plugin generic/loggrep for generic log grepping.
#
#
# Magic markers (optional - used by munin-config and some installation
# scripts):
#
#%# family=manual
use strict;
my %regex;
my $logfile = $ENV{logfile};
(my $name = $0) =~ s|.*/||;
die("No log file specified") unless defined $logfile;
if (exists $ENV{'regex'}) {
$regex{'count'}{'regex'} = qr/$ENV{'regex'}/;
$regex{'count'}{'label'} = $ENV{'label'} || $ENV{'regex'};
$regex{'count'}{'value'} = 0;
}
for my $key (map {/^regex_(.+)/} keys %ENV) {
$regex{$key}{'regex'} = qr/$ENV{"regex_$key"}/;
$regex{$key}{'label'} = $ENV{"label_$key"} || $ENV{"regex_$key"};
$regex{$key}{'value'} = 0;
}
die("No regexes specified") unless keys %regex;
my $statefile = "@@PLUGSTATE@@/$name.state";
if ($ARGV[0] and $ARGV[0] eq 'config') {
my $title = $ENV{title} || "Entries in $logfile";
print "graph_title $title\n";
print "graph_args --base 1000 -l 0\n";
print "graph_vlabel entries / \${graph_period}\n";
print "graph_category other\n";
for my $key (keys %regex) {
print "$key.label $regex{$key}{'label'}\n";
print "$key.type DERIVE\n";
print "$key.min 0\n";
print "$key.draw LINE2\n";
}
exit 0;
}
my %pos = map { $_ => undef } glob($logfile);
if (-f $statefile) {
open(my $in, '<', $statefile) or die("Can't read $statefile: $!\n");
while (<$in>) {
chomp;
if (/^([^=]+)=(\d+)$/ && exists $regex{$1}) {
$regex{$1}{'value'} = $2;
} else {
last;
}
}
do {
chomp;
if (<$in> =~ /^(\d+)$/ and exists $pos{$_}) {
$pos{$_} = $1
}
} while (<$in>);
close $in;
}
for my $log (keys %pos) {
$pos{$log} = parse_log($log, $pos{$log});
}
for my $key (keys %regex) {
print "$key.value $regex{$key}{'value'}\n";
}
if(-l $statefile) {
die("$statefile is a symbolic link, refusing to touch it.\n");
}
open(my $out, '>', $statefile) or die("Can't write $statefile: $!\n");
for my $key (keys %regex) {
print $out "$key=$regex{$key}{'value'}\n";
}
for my $log (keys %pos) {
print $out "$log\n$pos{$log}\n";
}
close $out;
sub parse_log {
my ($fname, $start) = @_;
open(my $logfh, $fname) or die ("Can't open log file $fname: $!\n");
my $size = (stat $logfh)[7];
# First encounter
$start = $size unless defined $start;
# The log has been rotated, start over
$start = 0 if $size < $start;
seek($logfh, $start, 0) or die ("Can't seek to $fname:$start: $!\n");
while (tell($logfh) < $size) {
my $line = <$logfh>;
for my $match (values %regex) {
if ($line =~ $match->{'regex'}) {
$match->{'value'}++;
}
}
}
close($logfh);
return $size;
}
# vim:syntax=perl
|
