#!/bin/bash

# MariaDB overrides for lib/databases/mysql

function cleanup_mariadb {
    stop_mariadb
    apt_get purge -y mysql* mariadb*
    sudo rm -rf /var/lib/mysql
    sudo rm -rf /etc/mysql
}

function configure_mariadb {
    local my_conf mysql slow_log
    echo_summary "Configuring and starting MariaDB"

    my_conf=/etc/mysql/my.cnf
    mysql=mysql

    sudo mysql -uroot -hlocalhost -e "GRANT ALL PRIVILEGES ON *.* TO '$DATABASE_USER'@'%' identified by '$DATABASE_PASSWORD';"

    # Now update ``my.cnf`` for some local needs and restart the mysql service

    # Change bind-address from localhost (127.0.0.1) to any (::) and
    # set default db type to InnoDB
    iniset -sudo $my_conf mysqld bind-address "$SERVICE_LISTEN_ADDRESS"
    iniset -sudo $my_conf mysqld sql_mode STRICT_ALL_TABLES
    iniset -sudo $my_conf mysqld default-storage-engine InnoDB
    iniset -sudo $my_conf mysqld max_connections 1024
    iniset -sudo $my_conf mysqld query_cache_type OFF
    iniset -sudo $my_conf mysqld query_cache_size 0

    if [[ "$DATABASE_QUERY_LOGGING" == "True" ]]; then
        echo_summary "Enabling MySQL query logging"
        slow_log=/var/log/mariadb/mariadb-slow.log
        sudo sed -e '/log.slow.queries/d' \
            -e '/long.query.time/d' \
            -e '/log.queries.not.using.indexes/d' \
            -i $my_conf
        # Turn on slow query log, log all queries (any query taking longer than
        # 0 seconds) and log all non-indexed queries
        iniset -sudo $my_conf mysqld slow-query-log 1
        iniset -sudo $my_conf mysqld slow-query-log-file $slow_log
        iniset -sudo $my_conf mysqld long-query-time 0
        iniset -sudo $my_conf mysqld log-queries-not-using-indexes 1
    fi

    restart_service $mysql
}

function install_mariadb {
    # while ``.my.cnf`` is not needed for OpenStack to function, it is useful
    # as it allows you to access the mysql databases via ``mysql nova`` instead
    # of having to specify the username/password each time.
    if [[ ! -e $HOME/.my.cnf ]]; then
        cat <<EOF >$HOME/.my.cnf
[client]
user=$DATABASE_USER
password=$DATABASE_PASSWORD
host=$MYSQL_HOST
EOF
        chmod 0600 $HOME/.my.cnf
    fi
    
    install_package mariadb-server
}

function stop_mariadb {
    stop_service mysql
}