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|
package Monitoring::Plugin::Range;
use 5.006;
use strict;
use warnings;
use Carp;
use base qw(Class::Accessor::Fast);
__PACKAGE__->mk_accessors(
qw(start end start_infinity end_infinity alert_on)
);
use Monitoring::Plugin::Functions qw(:DEFAULT $value_re);
our ($VERSION) = $Monitoring::Plugin::Functions::VERSION;
use overload
'eq' => sub { shift->_stringify },
'""' => sub { shift->_stringify };
# alert_on constants (undef == range not set)
use constant OUTSIDE => 0;
use constant INSIDE => 1;
sub _stringify {
my $self = shift;
return "" unless $self->is_set;
return (($self->alert_on) ? "@" : "") .
(($self->start_infinity == 1) ? "~:" : (($self->start == 0)?"":$self->start.":")) .
(($self->end_infinity == 1) ? "" : $self->end);
}
sub is_set {
my $self = shift;
(! defined $self->alert_on) ? 0 : 1;
}
sub _set_range_start {
my ($self, $value) = @_;
$self->start($value+0); # Force scalar into number
$self->start_infinity(0);
}
sub _set_range_end {
my ($self, $value) = @_;
$self->end($value+0); # Force scalar into number
$self->end_infinity(0);
}
# Returns a N::P::Range object if the string is a conforms to a Monitoring Plugin range string, otherwise null
sub parse_range_string {
my ($class, $string) = @_;
my $valid = 0;
my $range = $class->new( start => 0, start_infinity => 0, end => 0, end_infinity => 1, alert_on => OUTSIDE);
$string =~ s/\s//g; # strip out any whitespace
# check for valid range definition
unless ( $string =~ /[\d~]/ && $string =~ m/^\@?($value_re|~)?(:($value_re)?)?$/ ) {
carp "invalid range definition '$string'";
return undef;
}
if ($string =~ s/^\@//) {
$range->alert_on(INSIDE);
}
if ($string =~ s/^~//) { # '~:x'
$range->start_infinity(1);
}
if ( $string =~ m/^($value_re)?:/ ) { # '10:'
my $start = $1;
$range->_set_range_start($start) if defined $start;
$range->end_infinity(1); # overridden below if there's an end specified
$string =~ s/^($value_re)?://;
$valid++;
}
if ($string =~ /^($value_re)$/) { # 'x:10' or '10'
$range->_set_range_end($string);
$valid++;
}
if ($valid && ($range->start_infinity == 1 || $range->end_infinity == 1 || $range->start <= $range->end)) {
return $range;
}
return undef;
}
# Returns 1 if an alert should be raised, otherwise 0
sub check_range {
my ($self, $value) = @_;
my $false = 0;
my $true = 1;
if ($self->alert_on == INSIDE) {
$false = 1;
$true = 0;
}
if ($self->end_infinity == 0 && $self->start_infinity == 0) {
if ($self->start <= $value && $value <= $self->end) {
return $false;
} else {
return $true;
}
} elsif ($self->start_infinity == 0 && $self->end_infinity == 1) {
if ( $value >= $self->start ) {
return $false;
} else {
return $true;
}
} elsif ($self->start_infinity == 1 && $self->end_infinity == 0) {
if ($value <= $self->end) {
return $false;
} else {
return $true;
}
} else {
return $false;
}
}
# Constructor - map args to hashref for SUPER
sub new
{
shift->SUPER::new({ @_ });
}
1;
__END__
=head1 NAME
Monitoring::Plugin::Range - class for handling Monitoring::Plugin range data.
=head1 SYNOPSIS
# NB: This is an internal Monitoring::Plugin class.
# See Monitoring::Plugin itself for public interfaces.
# Instantiate an empty range object
$r = Monitoring::Plugin::Range->new;
# Instantiate by parsing a standard nagios range string
$r = Monitoring::Plugin::Range->parse_range_string( $range_str );
# Returns true if the range is defined/non-empty
$r->is_set;
# Returns true if $value matches range, false otherwise
$r->check_range($value);
=head1 DESCRIPTION
Internal Monitoring::Plugin class for handling common range data. See
Monitoring::Plugin for public interfaces.
=head1 AUTHOR
This code is maintained by the Monitoring Plugin Development Team: see
https://monitoring-plugins.org
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2014 by Monitoring Plugin Team
Copyright (C) 2006-2014 by Nagios Plugin Development Team
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
|
