#!/usr/bin/perl
#
# Copyright (C) 2006 - Rodolphe Quiédeville <rodolphe@quiedeville.org>
# Copyright (C) 2003-2004 - Andreas Buer
#
# 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.
#
# $Log$
# Revision 1.0  2006/04/28 09:04:01  rodo
# Add lower limit fixed to 0
#
# Revision 1.0  2006/04/26 16:04:01  rodo
# Created by Rodolphe Quiédeville
#
# Parameters:
#
#   config
#   autoconf
#
# Configuration variables
#
#   mysqlopts     - Options to pass to mysql
#   mysqladmin    - Override location of mysqladmin
#
#%# family=auto
#%# capabilities=autoconf

use strict;

my $MYSQLADMIN = $ENV{mysqladmin} || "mysqladmin";
my $COMMAND    = "$MYSQLADMIN $ENV{mysqlopts} extended-status";
my $COMMANDSIZE = "$MYSQLADMIN $ENV{mysqlopts} variables";

my %WANTED = ( "Qcache_free_memory" => "free" );

my $arg = shift();

if ($arg eq 'config') {
    print_config();
    exit();
} elsif ($arg eq 'autoconf') {
    unless (test_service() ) {
        print "yes\n";
    } else {
        print "no\n";
    }
    exit;
}

my ($free, $used) = (0,0);

open(SERVICE, "$COMMAND |")
  or die("Could not execute '$COMMAND': $!");

while (<SERVICE>) {
    my ($k, $v) = (m/(\w+).*?(\d+(?:\.\d+)?)/);
    next unless ($k);
    if (exists $WANTED{$k} ) {
	$free = $v;
	print("$WANTED{$k}.value $v\n");
    }
}
close(SERVICE);

open(SERVICE, "$COMMANDSIZE |")
  or die("Could not execute '$COMMANDSIZE': $!");

while (<SERVICE>) {
    my ($k, $v) = (m/(\w+).*?(\d+(?:\.\d+)?)/);

    next unless ($k);
    if ($k eq "query_cache_size" ) {
	print("used.value ",($v-$free),"\n");
    }
}
close(SERVICE);

sub print_config {

    print('graph_title MySQL Queries Cache Size
graph_args --base 1024 -l 0
graph_vlabel bytes
graph_category db
graph_order used free
graph_total Total
graph_info Plugin available at <a href="http://rodolphe.quiedeville.org/hack/munin/">http://rodolphe.quiedeville.org/hack/munin/</a>
used.label Used
used.draw AREA
free.label Free
free.draw STACK
');
}

sub test_service {

    my $return = 1;

    system ("$MYSQLADMIN --version >/dev/null 2>/dev/null");
    if ($? == 0)
    {
	system ("$COMMAND >/dev/null 2>/dev/null");
	if ($? == 0)
	{
	    print "yes\n";
	    $return = 0;
	}
	else
	{
	    print "no (could not connect to mysql)\n";
	}
    }
    else
    {
	print "no (mysqladmin not found)\n";
    }
    exit $return;
}