#!/usr/bin/perl
#
# Copyright (C) 2009 Magnus Hagander, Redpill Linpro AB
#
# 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; version 2 dated June,
# 1991.
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.

=head1 NAME

postgres_querylength_ - Plugin to monitor PostgreSQL long running queries.

=head1 CONFIGURATION

Configuration is done through libpq environment variables, for example
PGUSER, PGDATABASE, etc. For more information, see L<Munin::Plugin::Pgsql>.

To monitor a specific database, link to postgres_querylength_<databasename>.
To monitor all databases, link to postgres_querylength_ALL.
To monitor several instances, link to postgres_<tag>_querylength_<databasename|ALL>
The <tag> can be what you want but without "_". It allows you to define several
database configuration.

Example :
  [postgres_pg91_*]
  env.PGPORT 5432
  [postgres_pg92_*]
  env.PGPORT 5432

=head1 SEE ALSO

L<Munin::Plugin::Pgsql>

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf suggest

=head1 AUTHOR

Magnus Hagander <magnus@hagander.net>, Redpill Linpro AB

=head1 COPYRIGHT/License.

Copyright (c) 2009 Magnus Hagander, Redpill Linpro AB

All rights reserved. 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; version 2
dated June, 1991.

=cut

use strict;
use warnings;

use Munin::Plugin::Pgsql;

my $pg = Munin::Plugin::Pgsql->new(
    basename  => 'postgres_[^_]*_?querylength_',
    title     => 'PostgreSQL query length',
    info      => 'Most long-running queries and transactions',
    vlabel    => 'Age (seconds)',
    basequery => [
        "SELECT 'query',COALESCE(max(extract(epoch FROM CURRENT_TIMESTAMP-query_start)),0) FROM pg_stat_activity WHERE state NOT LIKE 'idle%' %%FILTER%%
                     UNION ALL
                    SELECT 'transaction',COALESCE(max(extract(epoch FROM CURRENT_TIMESTAMP-xact_start)),0) FROM pg_stat_activity WHERE 1=1 %%FILTER%%",
        [
            9.1,
            "SELECT 'query',COALESCE(max(extract(epoch FROM CURRENT_TIMESTAMP-query_start)),0) FROM pg_stat_activity WHERE query NOT LIKE '<IDLE%' %%FILTER%%
                     UNION ALL
                    SELECT 'transaction',COALESCE(max(extract(epoch FROM CURRENT_TIMESTAMP-xact_start)),0) FROM pg_stat_activity WHERE 1=1 %%FILTER%%",
        ],
        [
            9.1,
            "SELECT 'query',COALESCE(max(extract(epoch FROM CURRENT_TIMESTAMP-query_start)),0) FROM pg_stat_activity WHERE current_query NOT LIKE '<IDLE%' %%FILTER%%
                     UNION ALL
                    SELECT 'transaction',COALESCE(max(extract(epoch FROM CURRENT_TIMESTAMP-xact_start)),0) FROM pg_stat_activity WHERE 1=1 %%FILTER%%",
        ],
        [
            8.2,
            "SELECT 'query',COALESCE(max(extract(epoch FROM CURRENT_TIMESTAMP-query_start)),0) FROM pg_stat_activity WHERE current_query NOT LIKE '<IDLE%' %%FILTER%%",
        ],
    ],
    wildcardfilter => " AND datname=?",
    paramdatabase  => 1,
    configquery    => [
        "VALUES ('query','Oldest query'),('transaction','Oldest transaction')",
        [8.2, "VALUES ('query','Oldest query')"],
        [8.1, "SELECT 'query','Oldest query'"],
    ],
    suggestquery =>
        "SELECT datname FROM pg_database WHERE datallowconn AND NOT datistemplate AND NOT datname='postgres' UNION ALL SELECT 'ALL' ORDER BY 1",
    stack => 0,
);

$pg->Process();