#!/usr/bin/env perl

use strict;
use warnings;

# must be run as root
my $L7VSADM = q{ /usr/sbin/l7vsadm };

if ( defined $ARGV[0] and $ARGV[0] eq 'autoconf' ) {
        get_autoconf();
}
elsif ( defined $ARGV[0] and $ARGV[0] eq 'config' ) {
        get_config();
}
else {
        get_value();
}
exit 0;

# -------------------------------------------------------------------------- #

sub get_autoconf
{
    `$L7VSADM`;
    if ( $? ) {
        print qq{no ($L7VSADM something wrong ...)\n};
    } else {
        print qq{yes\n};
    }
}


sub get_config
{
    my %l7vsadm = get_l7vsadm();

    # print graph config
    my $graph_order = join q{ }, keys %l7vsadm;
    print << "END_graph_";
graph_title Connections
graph_args --base 1000 -l 0
graph_vlabel connections / sec
graph_info UltraMonkey-L7 Connections
graph_category loadbalancer
graph_order $graph_order
END_graph_

    # print graph config detail each hosts
    foreach my $host ( sort keys %l7vsadm ) {
        print << "END_hosts_";
$host.label $host
$host.type COUNTER
$host.draw AREASTACK
END_hosts_
    }
}


sub get_value
{
    my %l7vsadm = get_l7vsadm();

    foreach my $host ( sort keys %l7vsadm ) {
        my $value = $l7vsadm{$host}->{InactConn};
        print qq{$host.value $value\n};
    }
}


sub get_l7vsadm
{
    my @l7vsadm_output = `$L7VSADM`;
    if ( $? ) {
        exit 1;
    }

    my @lines = map { s{ \s* -> \s* }{}xms; $_ } grep /->/, @l7vsadm_output;
    my $header = shift @lines;
    my @header_columns = split /\s+/, $header;
    shift @header_columns;

    my %l7vsadm = ();
    foreach ( @lines ) {
        my ( $host, @values ) = split /\s+/, $_;
        my %value_hash = ();
        @value_hash{ @header_columns } = @values;
        $l7vsadm{$host} = \%value_hash;
    }

    %l7vsadm;
}


__END__
# -------------------------------------------------------------------------- #
This program must be run as root.
add settings like below.

--- /etc/munin/plugin-conf.d/munin-node ---
[ultramonkeyl7]
user root
--- /etc/munin/plugin-conf.d/munin-node ---

# -------------------------------------------------------------------------- #
get_l7vsadm : l7vsadm output to hash

--- l7vsadm output ---
Layer-7 Virtual Server version 3.0.1
Prot LocalAddress:Port ProtoMod Scheduler
  -> RemoteAddress:Port           Forward Weight ActiveConn InactConn
TCP ldb001:mysql sessionless lc
  -> db002:mysql                  Masq    1      0          2796
  -> db003:mysql                  Masq    1      0          259
  -> db004:mysql                  Masq    1      0          6
--- l7vsadm output ---

--- hash ---
$VAR1 = {
          'db002:mysql' => {
                             'ActiveConn' => '0',
                             'Forward' => 'Masq',
                             'InactConn' => '2796',
                             'Weight' => '1'
                           },
          'db003:mysql' => {
                              'ActiveConn' => '0',
                              'Forward' => 'Masq',
                              'InactConn' => '259',
                              'Weight' => '1'
                            },
          'db004:mysql' => {
                             'ActiveConn' => '0',
                             'Forward' => 'Masq',
                             'InactConn' => '6',
                             'Weight' => '1'
                           },
--- hash ---