#!/usr/bin/perl
#
# Copyright (C) 2007 - 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 1.1  2007/01/17 10:41:01  rodo
# Change incorrect family
#
# Revision 1.0  2007/01/16 15:57:01  rodo
# Created by Rodolphe Quiédeville
#
# Parameters:
#
#   config
#   autoconf
#
# Configuration variables
#
#   mysqlopts     - Options to pass to mysql
#   mysqladmin    - Override location of mysqladmin
#
#%# family=manual
#%# capabilities=autoconf

use strict;

use Munin::Plugin;


my $COMMAND;
my $MYSQLADMIN = $ENV{mysqladmin} || "mysql";

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;
}

sub getDBList;
foreach my $db (getDBList()) {

  my (@infos,$info,$i_data,$i_index);

  $COMMAND = "$MYSQLADMIN $ENV{mysqlopts} $db -e 'show table status;' | head -n 1";

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

  while (<SERVICE>) {
      (@infos)  = split;
  }
  close(SERVICE);

  my $i = 0;
  foreach $info (@infos) {
      $i++;
      if ($info eq 'Data_length') {
    $i_data = $i;
    next;
      }
      if ($info eq 'Index_length') {
    $i_index = $i;
    last;
      }
  }
  my $total_size = 0;
  if ($i_data>0 && $i_index>0) {
    $COMMAND = "$MYSQLADMIN $ENV{mysqlopts} $db -e 'show table status;' | cut -f $i_data,$i_index | grep -v leng";

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

    while (<SERVICE>) {
        (m/(\d+).*?(\d+(?:\.\d+)?)/);
        $total_size += $1 + $2;
    }
    close(SERVICE);

  }
  my $fieldname = clean_fieldname($db);
  print("$fieldname.value $total_size\n");
}


sub print_config {

    my $num = 0;

    my @dbs = getDBList;

    print("graph_title MySQL databases size\n");
    print ('graph_args --base 1024 -l 0
graph_vlabel bytes
graph_category db
graph_info Plugin available at <a href="http://rodolphe.quiedeville.org/hack/munin/">http://rodolphe.quiedeville.org/hack/munin/</a>
');

    for my $db (@dbs) {
        my $fieldname = clean_fieldname($db);
        print("$fieldname.label $db\n",
              "$fieldname.min 0\n",
              "$fieldname.type GAUGE\n",
              "$fieldname.draw AREASTACK\n",
             );
        $num++;
    }
}


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;
}

sub getDBList {
  my @dbs;
  foreach my $f (glob("/var/lib/mysql/*")) {
    if (-d $f) {
      $f =~ s/\@002d/-/g;
      $f =~ s/\@002e/./g;
      $f =~ s!.*/!!;
      @dbs[$#dbs+1]=$f };
  }
  return @dbs;
}