#!/bin/sh

DAEMON="fluent-bit"
PID_FILE="/var/run/$DAEMON.pid"
CONF_FILE="/etc/$DAEMON/$DAEMON.conf"

FLUENT_BIT_ARGS=""

# shellcheck source=/dev/null
[ -r "/etc/default/$DAEMON" ] && . "/etc/default/$DAEMON"

start() {
	printf 'Starting %s: ' "$DAEMON"
	# shellcheck disable=SC2086 # we need the word splitting
	start-stop-daemon -S -q -b -m -p "$PID_FILE" --exec "/usr/bin/$DAEMON" \
		-- -c "$CONF_FILE" $FLUENT_BIT_ARGS
	status=$?
	if [ "$status" -eq 0 ]; then
		echo "OK"
	else
		echo "FAIL"
	fi
	return "$status"
}

stop() {
	printf 'Stopping %s: ' "$DAEMON"
	start-stop-daemon -K -q -p "$PID_FILE"
	status=$?

	if [ -f "$PID_FILE" ]; then
		pid=$(cat "$PID_FILE")
		rm -f "$PID_FILE"

		# https://docs.fluentbit.io/manual/administration/configuring-fluent-bit/yaml/configuration-file#config_section
		# The default grace time is set to 5 seconds, so use 6 seconds to have some margin.
		timeout=6
		while kill -0 "$pid" 2>/dev/null; do
			[ $timeout -eq 0 ] && status=1 && break
			timeout=$((timeout - 1))
			sleep 1
		done
	fi

	if [ "$status" -eq 0 ]; then
		echo "OK"
	else
		echo "FAIL"
	fi
	return "$status"
}

restart() {
	stop
	start
}

case "$1" in
start)
	start
	;;
stop)
	stop
	;;
restart | reload)
	restart
	;;
*)
	echo "Usage: $0 {start|stop|restart}"
	exit 1
	;;
esac