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package Travelynx::Command::munin;
# Copyright (C) 2020 Daniel Friesel
#
# SPDX-License-Identifier: AGPL-3.0-or-later
use Mojo::Base 'Mojolicious::Command';
use DateTime;
has description => 'Generate statistics for munin-node';
has usage => sub { shift->extract_usage };
sub query_to_munin {
my ( $label, $value ) = @_;
if ( defined $value ) {
printf( "%s.value %f\n", $label, $value );
}
}
sub run {
my ( $self, $filename ) = @_;
my $db = $self->app->pg->db;
my $now = DateTime->now( time_zone => 'Europe/Berlin' );
my $active = $now->clone->subtract( months => 1 );
my $checkin_window_query
= qq{select count(*) as count from journeys where checkin_time > to_timestamp(?);};
# DateTime's math does not like time zones: When subtracting 7 days from
# sun 2am and the previous sunday was the switch from CET to CEST (i.e.,
# the switch to daylight saving time), the resulting datetime is invalid.
# This is a fatal error. We avoid this edge case by performing date math
# on the epoch timestamp, which does not know or care about time zones and
# daylight saving time.
my $one_day = 24 * 60 * 60;
my $one_week = 7 * $one_day;
my $one_month = 30 * $one_day;
query_to_munin( 'reg_user_count',
$db->select( 'users', 'count(*) as count', { status => 1 } )
->hash->{count} );
query_to_munin(
'active_user_count',
$db->select(
'users',
'count(*) as count',
{
status => 1,
last_seen => { '>', $active }
}
)->hash->{count}
);
query_to_munin( 'checked_in',
$db->select( 'in_transit', 'count(*) as count' )->hash->{count} );
query_to_munin( 'checkins_24h',
$db->query( $checkin_window_query, $now->epoch - $one_day )
->hash->{count} );
query_to_munin( 'checkins_7d',
$db->query( $checkin_window_query, $now->epoch - $one_week )
->hash->{count} );
query_to_munin( 'checkins_30d',
$db->query( $checkin_window_query, $now->epoch - $one_month )
->hash->{count} );
query_to_munin( 'polylines',
$db->select( 'polylines', 'count(*) as count' )->hash->{count} );
query_to_munin(
'polyline_ratio',
$db->query(
'select (select count(polyline_id) from journeys)::float / (select count(*) from polylines) as ratio'
)->hash->{ratio}
);
}
1;
__END__
=head1 SYNOPSIS
Usage: index.pl munin
Write statistics for munin-node to stdout
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