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#!/bin/sh
#
# redis		redis-server - Persistent key-value db
#
# chkconfig: - 20 80
# description:	redis-server is a persistent key-value db \
#		This script starts and stops the redis daemon.
# processname: redis-server
# config: /etc/redis/redis.conf
# pidfile: /var/run/redis/redis-server.pid
### BEGIN INIT INFO
# Provides:	redis-server
# Required-Start:	$syslog $remote_fs
# Required-Stop:	$syslog $remote_fs
# Should-Start:		$local_fs
# Should-Stop:		$local_fs
# Default-Start:	2 3 4 5
# Default-Stop:		0 1 6
# Short-Description:	redis-server - Persistent key-value db
# Description:		redis-server - Persistent key-value db
### END INIT INFO

# Do not load RH compatibility interface.
WITHOUT_RC_COMPAT=1

# Source function library.
. /etc/init.d/functions

PIDDIR=/var/run/redis/
PIDFILE=$PIDDIR/redis-server.pid
LOCKFILE=/var/lock/subsys/redis

REDIS_DAEMON=/usr/sbin/redis-server
REDIS_CLI=/usr/bin/redis-cli

SYSCONFIG=/etc/sysconfig/redis

REDIS_USER=_redis
REDIS_GROUP=_redis
CONFIG_FILE=/etc/redis/redis.conf
CLI_ARGS=''
STOP_METHOD="TERM"
WAIT_TIMEOUT=300
SHUTDOWN_CMD='shutdown'

RETVAL=0

SourceIfExists "$SYSCONFIG"

call_cli()
{
	CMD=$1
	[ "foo$CMD" = "foo" ] && CMD='save'

	if [ -f $PIDFILE ]; then
		$REDIS_CLI $CLI_ARGS $CMD
		if [ $? -ne 0 ]; then
			failure "Fail to run 'redis-cli $CLI_ARGS $CMD'"
		fi
	else
		msg_not_running "redis-server"
	fi
}

start()
{
	mkdir -p $PIDDIR
	chown root:$REDIS_GROUP $PIDDIR
	chmod 0775 $PIDDIR

	start_daemon --pidfile "$PIDFILE" --lockfile "$LOCKFILE" --user $REDIS_USER --expect-user $REDIS_USER -- $REDIS_DAEMON $CONFIG_FILE
	RETVAL=$?
	return $RETVAL
}

is_running()
{
	status --pidfile "$PIDFILE" --expect-user $REDIS_USER -- redis-server >/dev/null
	return $?
}


kill_daemon()
{
# Immediately daemon with SIGKILL signal
	echo -n "Stopping redis-server service (KILLing it): "
	stop_daemon --pidfile "$PIDFILE" --lockfile "$LOCKFILE" --expect-user $REDIS_USER -KILL -- $REDIS_DAEMON
	RETVAL=$?
	return $RETVAL
}

stop_wait()
{
	for i in `seq 1 $1`; do
		is_running || return
		printf '%5s' "$i"
		sleep 1
		printf "\b\b\b\b\b     \b\b\b\b\b"
	done
	return 255
}

term_daemon()
{
	echo -n "Sending TERM signal to redis-server: "
	stop_daemon --pidfile "$PIDFILE" --lockfile "$LOCKFILE" --expect-user $REDIS_USER -TERM -- $REDIS_DAEMON

	echo -n "Waiting, while redis-server actualy stopped:"
	stop_wait $WAIT_TIMEOUT
	RETVAL=$?
	if [ $RETVAL -eq 255 ]; then
		echo_failure
		echo
		stop_daemon --pidfile "$PIDFILE" --lockfile "$LOCKFILE" --expect-user $REDIS_USER -- $REDIS_DAEMON
		RETVAL=$?
	else
		echo_success
		echo
	fi
	return $RETVAL
}

shutdown_daemon()
{
	if is_running; then
		echo -n "Shutdown redis-server, saving databases... "
		call_cli "$SHUTDOWN_CMD"
		if is_running; then # Stil running - something wrong
			echo_failure
			echo
			echo -n "Can't stop daemon - something wrong. Check log file for details."
			return 255
		else
			echo_success
			rm -f "$LOCKFILE"
		fi
	else
		msg_not_running "redis-server"
		echo_passed
	fi
	echo
	return 0
}


stop()
{
# NOTE: using standard 'stop_daemon --pidfile ... --lockfile ... --expect-user ... -- ...' COULD CAUSE A DATA LOSS.

	case "$STOP_METHOD" in
		KILL|kill|SIGKILL)
			kill_daemon
			RETVAL=$?
			;;
		SHUTDOWN|shutdown)
			shutdown_daemon
			RETVAL=$?
			;;
		TERM|term|SIGTERM)
			term_daemon
			RETVAL=$?
			;;
		*)
			echo "Unknown method '$STOP_METHOD' to stop redis-server - check '$SYSCONFIG' file"
			echo "Using TERM method as default"
			term_daemon
			RETVAL=$?
	esac

	return $RETVAL
}

restart()
{
	stop
	start
}

# See how we were called.
case "$1" in
	start)
		start
		;;
	stop)
		stop
		;;
	reload)
		# No way to reload - restart only
		restart
		;;
	restart)
		restart
		;;
	condstop)
		if [ -e "$LOCKFILE" ]; then
			stop
		fi
		;;
	condrestart)
		if [ -e "$LOCKFILE" ]; then
			restart
		fi
		;;
	condreload)
		if [ -e "$LOCKFILE" ]; then
			restart
		fi
		;;
	status)
		status --pidfile "$PIDFILE" --expect-user $REDIS_USER -- redis-server
		RETVAL=$?
		;;
	save)
		if [ -e "$LOCKFILE" ]; then
			echo "Saving Redis databases ..."
			call_cli save
		fi
		;;
	*)
		msg_usage "${0##*/} {start|stop|reload|restart|condstop|condrestart|condreload|status|save}"
		RETVAL=1
esac

exit $RETVAL