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#!/usr/bin/bash
#
# lustre_route_config
# This script configures lnet with the routes in the passed in file.
# The routes should be in the following format:
# <network>: { gateway: <gateway>@<exit network> [hop: <hop>] [priority: <prioirty>] }
#
# Examples:
# tcp1: { gateway: 10.1.1.2@tcp0, priority: 3 }
# tcp4: { gateway: 10.3.3.4@tcp }
# tcp6: { gateway: 10.3.3.6@tcp, hop: 2, priority: 5 }
# tcp7: { gateway: 10.3.3.[6-12]@tcp, priority: 20, hop: 8 }
#
# The purpose of this script is to circumvent the limitation on the number of
# routes which could be configured through the lustre.conf module parameters.
#
###########################################################################


progname=$(basename $0)

# print usage
usage() {
	cat <<- USAGE
	Setup or cleanup LNET routes from specified config file"
	usage: $progname [--setup|--cleanup|--dry-run|--verbose]
	<config_file>
		--setup: configure routes listed in config_file
		--cleanup: unconfigure routes listed in config_file
		--dry-run: echo commands to be run, but do not execute them
		--verbose: echo commands before they are executed
	USAGE
}

# Set default paramters
CMD=add_route
VERBOSE=false
EXEC=true

# sanity check
[ -z "$1" ] && usage && exit 1

# check parameters
while [ ! -f "$1" ]; do
	case "$1" in
	-c|--cleanup) CMD=del_route; shift ;;
	-h|--help)    usage; exit 0 ;;
	-n|--dry-run) EXEC=false; VERBOSE=true; shift ;;
	-s|--setup)   CMD=add_route; shift ;;
	-v|--verbose) VERBOSE=true; shift ;;
	*)            usage; exit 1 ;;
	esac
done

# Usage: do_lctl <params>
# execut the command and/or print if verbose is set
do_lctl() {
	local RC=0

	$VERBOSE && echo "lctl $@"
	if $EXEC; then
		lctl "$@"
		RC=$?
	fi

	return $RC
}

# Usage: find_arg_value <array> <arg>
find_arg_value() {
	local i=0
	local value=""
	local arg="$2"

	declare -a array=("${!1}")
	for ((i = 0; i < ${#array[@]}; i++)); do
		if [ "${array[$i]}" == "$arg" ]; then
			value="${array[$((i + 1))]}"
			break
		fi
	done
	echo -n $value
}

while read line; do
	# skip lines that are entirely whitespace or
	# when the first non-whitespace character is #
	if [[ "$line" =~ ^[[:space:]]*(#|$) ]]; then
		continue
	fi

	# Parse line using ':' and ',' as delimiters and ignoring all
	# white space, tabs and linefeed
	IFS="$IFS:,"
	params=($line)

	# get the mandatory parameters: network and gateway
	# If either is not present skip that line
	network=${params[0]}
	OBR=${params[1]}
        GATE=${params[2]}
	gateway=${params[3]}

	if [ -z $network ] || [ -z $gateway ] ||
	   [ $GATE != "gateway" ]; then
		continue
	fi

	case "$CMD" in
		add_route)
			baselctl="--net $network add_route $gateway"

			# walk through the optional params until you hit
			# the closing brace.  Build an associative db:
			# option=value
			i=4
			while [ $i -lt ${#params[@]} ]; do
				option=${params[$i]}
				if [ "$option" == "}" ]; then
					break
				fi
				outoptions[$i]=$option
				((i++))
				value=${params[$i]}
				outoptions[$i]=$value
				((i++))
			done

			# find the hop and priority
			# This can be expanded later on if we add extra
			# parameters
			# NOTE: the order between hop and priority is not
			# enforced.  It's also possible to add hop without
			# prio or prio without hop
			priority=$(find_arg_value outoptions[@] "priority")
			hop=$(find_arg_value outoptions[@] "hop")
			if [ -n "$priority" ] && [ -z "$hop" ]; then
				baselctl+=" 1 $priority"
			else
				baselctl+=" $hop $priority"
			fi
			;;
		del_route)
			baselctl="del_route $gateway"
	esac

	do_lctl $baselctl
done < "$1"