#!/bin/bash
#
# koha-indexer - Manage Indexer Daemons for Koha instances
# Copyright 2014 Tomás Cohen Arazi @ Universidad Nacional de Córdoba
#
# 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 3 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, see <https://www.gnu.org/licenses/>.

set -e

. /lib/lsb/init-functions

# Read configuration variable file if it is present
[ -r /etc/default/koha-common ] && . /etc/default/koha-common

# include helper functions
if [ -f "/usr/share/koha/bin/koha-functions.sh" ]; then
    . "/usr/share/koha/bin/koha-functions.sh"
else
    echo "Error: /usr/share/koha/bin/koha-functions.sh not present." 1>&2
    exit 1
fi

usage()
{
    local scriptname=$(basename $0)

    cat <<EOF
$scriptname

This script lets you manage the indexer daemon for your Koha instances.

Usage:
$scriptname [--start|--stop|--restart] [--quiet|-q] instancename1 [instancename2...]
$scriptname -h|--help

    --start               Start the indexer daemon for the specified instances
    --stop                Stop the indexer daemon for the specified instances
    --restart             Restart the indexer daemon for the specified instances
    --status              Show the status of the indexer for the specified instances
    --quiet|-q            Make the script quiet about non existent instance names
                          (useful for calling from another scripts).
    --help|-h             Display this help message

EOF
}

start_indexer()
{
    local name=$1

    if ! is_indexer_running $name; then
        export KOHA_CONF="/etc/koha/sites/$name/koha-conf.xml"

        DAEMONOPTS="--name=$name-koha-indexer \
            --errlog=/var/log/koha/$name/indexer-error.log \
            --output=/var/log/koha/$name/indexer-output.log \
            --pidfiles=/var/run/koha/$name/ \
            --verbose=1 --respawn --delay=30 \
            --user=$name-koha.$name-koha"

        log_daemon_msg "Starting Koha indexing daemon for $name"

        if daemon $DAEMONOPTS -- $INDEXER_DAEMON $INDEXER_PARAMS; then
            log_end_msg 0
        else
            log_end_msg 1
        fi
    else
        log_daemon_msg "Error: Indexer already running for $name"
        log_end_msg 1
    fi
}

stop_indexer()
{
    local name=$1

    if is_indexer_running $name; then
        export KOHA_CONF="/etc/koha/sites/$name/koha-conf.xml"

        DAEMONOPTS="--name=$name-koha-indexer \
            --errlog=/var/log/koha/$name/indexer-error.log \
            --output=/var/log/koha/$name/indexer-output.log \
            --pidfiles=/var/run/koha/$name/ \
            --verbose=1 --respawn --delay=30 \
            --user=$name-koha.$name-koha"

        log_daemon_msg "Stopping Koha indexing daemon for $name"

        if daemon $DAEMONOPTS --stop -- $INDEXER_DAEMON $INDEXER_PARAMS; then
            log_end_msg 0
        else
            log_end_msg 1
        fi
    else
        log_daemon_msg "Error: Indexer not running for $name"
        log_end_msg 1
    fi
}

restart_indexer()
{
    local name=$1

    if is_indexer_running $name; then
        export KOHA_CONF="/etc/koha/sites/$name/koha-conf.xml"

        DAEMONOPTS="--name=$name-koha-indexer \
            --errlog=/var/log/koha/$name/indexer-error.log \
            --output=/var/log/koha/$name/indexer-output.log \
            --pidfiles=/var/run/koha/$name/ \
            --verbose=1 --respawn --delay=30 \
            --user=$name-koha.$name-koha"

        log_daemon_msg "Restarting Koha indexing daemon for $name"

        if daemon $DAEMONOPTS --restart -- $INDEXER_DAEMON $INDEXER_PARAMS; then
            log_end_msg 0
        else
            log_end_msg 1
        fi
    else
        log_warning_msg "Indexer not running for $name."
        start_indexer $name
    fi
}

indexer_status()
{
    local name=$1

    if is_indexer_running ${name}; then
        log_daemon_msg "Indexer running for ${name}"
        log_end_msg 0
    else
        log_daemon_msg "Indexer not running for ${name}"
        log_end_msg 3
    fi
}

set_action()
{
    if [ "$op" = "" ]; then
        op=$1
    else
        die "Error: only one action can be specified."
    fi
}

op=""
quiet="no"

# Read command line parameters
while [ $# -gt 0 ]; do

    case "$1" in
        -h|--help)
            usage ; exit 0 ;;
        -q|--quiet)
            quiet="yes"
            shift ;;
        --start)
            set_action "start"
            shift ;;
        --stop)
            set_action "stop"
            shift ;;
        --restart)
            set_action "restart"
            shift ;;
        --status)
            set_action "status"
            shift ;;
        --debug)
            DEBUG="-v -v"
            shift ;;
        -*)
            die "Error: invalid option switch ($1)" ;;
        *)
            # We expect the remaining stuff are the instance names
            break ;;
    esac

done

# Check if an alternate indexer has been set
if [ ! -z "$ALTERNATE_INDEXER_DAEMON" ]; then
    INDEXER_DAEMON="$ALTERNATE_INDEXER_DAEMON"
fi

if [ $INDEXER_TIMEOUT -lt 1 ]; then
    # Something's wrong, default to 5 seconds
    INDEXER_TIMEOUT=5
fi

if [ -z "$INDEXER_PARAMS" ]; then
    # Default to the parameters required by rebuild_zebra.pl
    INDEXER_PARAMS="-daemon -sleep $INDEXER_TIMEOUT $DEBUG"
fi

if [ $# -gt 0 ]; then
    # We have at least one instance name
    for name in "$@"; do

        if is_instance $name; then

            adjust_paths_git_install $name
            if [ -z "$ALTERNATE_INDEXER_DAEMON" ]; then
                # We default to rebuild_zebra.pl if no alternate indexer set
                INDEXER_DAEMON="${KOHA_HOME}/${KOHA_BINDIR}/migration_tools/rebuild_zebra.pl"
            fi
            export PERL5LIB

            case $op in
                "start")
                    start_indexer $name
                    ;;
                "stop")
                    stop_indexer $name
                    ;;
                "restart")
                    restart_indexer $name
                    ;;
                "status")
                    indexer_status $name
            esac

        else
            if [ "$quiet" = "no" ]; then
                log_daemon_msg "Error: Invalid instance name $name"
                log_end_msg 1
            fi
        fi

    done
else
    if [ "$quiet" = "no" ]; then
        warn "Error: you must provide at least one instance name"
    fi
fi

exit 0
