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package Smokeping::matchers::CheckLoss;
=head1 NAME
Smokeping::matchers::CheckLoss - Edge triggered alert to check loss is under a value for x number of samples
=head1 DESCRIPTION
Call the matcher with the following sequence:
type = matcher
edgetrigger = yes
pattern = CheckLoss(l=>loss to check against,x=>num samples required for a match)
This will create a matcher which checks for "l" loss or greater over "x" samples before raising,
and will hold the alert until "x" samples under "l" before clearing
=head1 COPYRIGHT
Copyright (c) 2006 Dylan C Vanderhoof, Semaphore Corporation
=head1 LICENSE
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; either version 2 of the License, or
(at your option) any later version.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
=head1 AUTHOR
Dylan Vanderhoof <dylanv@semaphore.com>
=cut
use strict;
use base qw(Smokeping::matchers::base);
use vars qw($VERSION);
$VERSION = 1.0;
use Carp;
# I never checked why Median works, but for some reason the first part of the hash was being passed as the rules instead
sub new(@) {
my $class = shift;
my $rules = {
l => '\d+',
x => '\d+'
};
my $self = $class->SUPER::new( $rules, @_ );
return $self;
}
# how many values should we require before raising?
sub Length($) {
my $self = shift;
return $self->{param}{x}; # Because we're edge triggered, we don't need any more than the required samples
}
sub Desc ($) {
croak "Monitor loss with a cooldown period for clearing the alert";
}
sub Test($$) {
my $self = shift;
my $data = shift; # @{$data->{rtt}} and @{$data->{loss}}
my $target = $self->{param}{l};
my $count = 0;
my $loss;
foreach $loss ( @{ $data->{loss} } ) {
# If there's an S in the array anywhere, return prevmatch
if ( $loss =~ /S/ ) { return $data->{prevmatch}; }
if ( $data->{prevmatch} ) {
# Alert has already been raised. Check to make sure ALL latencies in RTT are less than the target
if ( $loss < $target ) { $count++; }
} else {
# Alert is not raised. If all values are over the alert threshold OR unreachable, raise the alert
if ( $loss >= $target ) { $count++; }
}
}
if ( $count >= $self->{param}{x} ) {
return !$data->{prevmatch};
}
return $data->{prevmatch};
}
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