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#!/usr/bin/env perl
# vim: se et ts=4:
#
# Copyright (C) 2012, Giacomo Montagner
#
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl 5.10.1.
# For more details, see http://dev.perl.org/licenses/artistic.html
#
# 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.
#
our $VERSION = "1.0.1";
# CHANGELOG:
# 1.0.0 - first release
# 1.0.1 - fixed empty message if all proxies are OK
#
use strict;
use warnings;
use 5.010.001;
use File::Basename qw/basename/;
use IO::Socket::UNIX;
use Getopt::Long;
sub usage {
my $me = basename $0;
print <.
$me is distributed under GPL and the Artistic License 2.0
SEE ALSO
Check out online haproxy documentation at
EOU
}
my %check_statuses = (
UNK => "unknown",
INI => "initializing",
SOCKERR => "socket error",
L4OK => "layer 4 check OK",
L4CON => "connection error",
L4TMOUT => "layer 1-4 timeout",
L6OK => "layer 6 check OK",
L6TOUT => "layer 6 (SSL) timeout",
L6RSP => "layer 6 protocol error",
L7OK => "layer 7 check OK",
L7OKC => "layer 7 conditionally OK",
L7TOUT => "layer 7 (HTTP/SMTP) timeout",
L7RSP => "layer 7 protocol error",
L7STS => "layer 7 status error",
);
my _æ_ status_names = (qw/OK WARNING CRITICAL UNKNOWN/);
# Defaults
my $swarn = 80.0;
my $scrit = 90.0;
my $sock = "/var/run/haproxy.sock";
my $dump;
my $proxy;
my $help;
# Read command line
Getopt::Long::Configure ("bundling");
GetOptions (
"c|critical=i" => \$scrit,
"d|dump" => \$dump,
"h|help" => \$help,
"p|proxy=s" => \$proxy,
"s|sock|socket=s" => \$sock,
"w|warning=i" => \$swarn,
);
# Want help?
if ($help) {
usage;
exit 3;
}
# Connect to haproxy socket and get stats
my $haproxy = new IO::Socket::UNIX (
Peer => $sock,
Type => SOCK_STREAM,
);
die "Unable to connect to haproxy socket: $ _æ_ " unless $haproxy;
print $haproxy "show stat\n" or die "Print to socket failed: $!";
# Dump stats and exit if requested
if ($dump) {
while (<$haproxy>) {
print;
}
exit 0;
}
# Get labels from first output line and map them to their position in the line
my $labels = <$haproxy>;
chomp($labels);
$labels =~ s/^# // or die "Data format not supported.";
my _æ_ labels = split /,/, $labels;
{
no strict "refs";
my $idx = 0;
map { $$_ = $idx++ } _æ_ labels;
}
# Variables I will use from here on:
our $pxname;
our $svname;
our $status;
my _æ_ proxies = split ',', $proxy if $proxy;
my $exitcode = 0;
my $msg;
my $checked = 0;
while (<$haproxy>) {
chomp;
next if /^[[:space:]]*$/;
my _æ_ data = split /,/, $_;
if ( _æ_ proxies) { next unless grep {$data[$pxname] eq $_} _æ_ proxies; };
# Is session limit enforced?
our $slim;
if ($data[$slim]) {
# Check current session # against limit
our $scur;
my $sratio = $data[$scur]/$data[$slim];
if ($sratio >= $scrit || $sratio >= $swarn) {
$exitcode = $sratio >= $scrit ? 2 :
$exitcode < 2 ? 1 : $exitcode;
$msg .= sprintf "%s:%s sessions: %.2f%%; ", $data[$pxname], $data[$svname], $sratio;
}
}
# Check of BACKENDS
if ($data[$svname] eq 'BACKEND') {
if ($data[$status] ne 'UP') {
$msg .= sprintf "BACKEND: %s is %s; ", $data[$pxname], $data[$status];
$exitcode = 2;
}
# Check of FRONTENDS
} elsif ($data[$svname] eq 'FRONTEND') {
if ($data[$status] ne 'OPEN') {
$msg .= sprintf "FRONTEND: %s is %s; ", $data[$pxname], $data[$status];
$exitcode = 2;
}
# Check of servers
} else {
if ($data[$status] ne 'UP') {
next if $data[$status] eq 'no check'; # Ignore server if no check is configured to be run
$exitcode = 2;
our $check_status;
$msg .= sprintf "server: %s:%s is %s", $data[$pxname], $data[$svname], $data[$status];
$msg .= sprintf " (check status: %s)", $check_statuses{$data[$check_status]} if $check_statuses{$data[$check_status]};
$msg .= "; ";
}
}
++$checked;
}
unless ($msg) {
$msg = _æ_ proxies ? sprintf("checked proxies: %s", join ', ', sort _æ_ proxies) : "checked $checked proxies.";
}
say "Check haproxy $status_names[$exitcode] - $msg";
exit $exitcode;
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