#!/usr/bin/env sh
# wordpress-multisite plugin
#
# Version 0.3
# Date 2017-01-12
# Some last minor fixes
#
# Version 0.2
# Date 2016-10-24
# Code improvements
#
# Version 0.1
# Date 2016-02-07
# Initial release
#
: <<=cut
=head1 NAME

Wordpress-Multisite Munin Plugin

A Munin plugin to monitor posts, comments and pingbacks from every multisite instance.
It uses multigraphs and also shows the combined number of posts, comments, pingbacks, instances and users.

Most database queries came from the wordpress-mu-plugin which was written by Andre Darafarin and Chris Bair

=head1 CONFIGURATION

The plugin need access to the wordpress database

=head2 Config file

Create the config file plugin-conf.d/wordpress with the following values:

  [wordpress*]
  env.mysqlopts		# i.e. -uroot -prootpass
  env.mysqlconnection	# defaults to -hlocalhost
  env.database		# i.e. -Dwordpress
  env.dbprefix		# defaults to wp_

=head1 VERSION

Version 0.3 (2017-01-12)

=head2 Some minor fixes:

  * fixed perldoc
  * fixed some syntax warnings from shellcheck
  * replaced expr by $(( ))

=head1 AUTHOR

Jonas Palm <jonaspalm . posteo . de>

=head1 LICENSE

GPLv3 or higher
=cut

# fill vars
DB_OPTIONS=${mysqlopts}
DB_CONNECTION=${mysqlconnection:--hlocalhost}
DB_NAME=${database}
DB_PREFIX=${dbprefix:-wp_}

MYSQL_CMD=$(which mysql)
wp_get() {
	case $1 in
		comments) QUERY="SELECT COUNT(*) FROM ${DB_PREFIX}${2}comments WHERE comment_approved = '1' AND comment_type = '';" ;;
		ids) QUERY="SELECT blog_id FROM ${DB_PREFIX}blogs;" ;;
		pingbacks) QUERY="SELECT COUNT(*) FROM ${DB_PREFIX}${2}comments WHERE comment_approved = '1' AND comment_type = 'pingback';" ;;
		posts) QUERY="SELECT COUNT(*) FROM ${DB_PREFIX}${2}posts WHERE post_status = 'publish' AND post_password = '' AND post_type = 'post';" ;;
		title) QUERY="SELECT option_value FROM ${DB_PREFIX}${2}options WHERE option_name = 'siteurl';" ;;
		users) QUERY="SELECT COUNT(*) FROM ${DB_PREFIX}users;"
	esac

	$MYSQL_CMD $DB_CONNECTION $DB_OPTIONS $DB_NAME --column-names=0 -s --execute="$QUERY"
}

# whole network
if [ "$1" = "config" ]; then
	echo "multigraph wordpress"
	echo "graph_title Wordpress Mulitsite"
	echo "graph_order instances users posts comments pingbacks"
	echo "graph_vlabel Wordpress"
	echo "graph_category Wordpress"
	echo "graph_info Some Statistics of Wordpress"
	echo "instances.label Instances"
	echo "users.label Users"
	echo "posts.label Posts"
	echo "comments.label Comments"
	echo "pingbacks.label Pingbacks"
else
	for n in $(wp_get ids); do
		i=
		test "$n" -gt "1" && i=${n}_

		POSTS=$((POSTS + $(wp_get posts "$i")))
		COMMENTS=$((COMMENTS + $(wp_get comments "$i")))
		PINGBACKS=$((PINGBACKS + $(wp_get pingbacks "$i")))
		CNT=$((CNT + 1))
	done

	echo "multigraph wordpress"
	echo "posts.value $POSTS"
	echo "comments.value $COMMENTS"
	echo "pingbacks.value $PINGBACKS"
	echo "instances.value $CNT"
	echo "users.value $(wp_get users)"
fi

# single blogs
for n in $(wp_get ids); do
	i=
	test "$n" -gt "1" && i=${n}_
	test "$n" -le "9" && n=0${n}

	if [ "$1" = "config" ]; then
		echo "multigraph wordpress.site_${n}"
		echo "graph_title $(wp_get title "$i")"
		echo "graph_order posts comments pingbacks"
		echo "graph_vlabel Wordpress ID ${n}"
		echo "posts.label Posts"
		echo "comments.label Comments"
		echo "pingbacks.label Pingbacks"
	else
		echo "multigraph wordpress.site_${n}"
		echo "posts.value $(wp_get posts "$i")"
		echo "comments.value $(wp_get comments "$i")"
		echo "pingbacks.value $(wp_get pingbacks "$i")"
	fi
done