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#!/usr/bin/bash
#
# lustre_routes_conversion
#   This script takes a file with routes configured as follows:
# <network>  [<hop>] <gateway>@<exit network>[:<priority>];
# Ex:
# tcp1 10.1.1.2@tcp0:1
# or
# tcp1 1 10.1.1.2@tcp0
#
# and converts it to:
# <network>: { gateway: <gateway>@<exit network> [hop: <hop>] [priority:
#              <priority>] }
#
# The purpose of this script is to covert legacy route configuration
# syntax to the new route configuration syntax
#
############################################################################

progname=$(basename $0)

usage() {
	cat <<- USAGE
	convert legacy route config syntax to new route config syntax"
	usage: $progname <legacy file> <new file>
            -h|--help: display this message
	USAGE
}

while [ ! -f "$1" ]; do
	case "$1" in
	-h|--help)    usage; exit 0 ;;
	*)            usage; exit 1 ;;
	esac
done

[ -z "$1" ] || [ -z "$2" ] && usage && exit 1

# Usage: read_and_parse <file name>
# Read a routes_config file and parse it out, then feed the proper input
# int lcl --net <> add_route <> to configure a route.
read_and_parse()
{
	local infile=$1
	local outfile=$2

	while read line; do
		# Split the input string at ';', since multiple routes on
		# the same line are separated by ';'
		OLDIFS="$IFS"
		IFS=';'

		# It is possible that one single line can contain multiple
		# route entries.
		multi_routes=($line)
		echo "${multi_routes[@]}"

		# Iterate over each of the routes on this line.  This
		# returns indicies from the routes[] array, which are
		# dereferenced and split separately to avoid confusion
		# between whitespaces of routes on the same line.
		for index in "${!multi_routes[@]}"; do
			# initialize variables.
			local network=""
			local gateway=""
			local gatewayorhop=""
			local priority=""
			local hop=""

			# Split at ':' and '  ' to get the priority if it exists
			# Also will split all the different tokens in the
			# line.
			IFS="$OLDIFS: "
			tokens=(${multi_routes[$index]})

			# Split at ' ' to separate the network from the gateway
			network=${tokens[0]}
			gatewayorhop=${tokens[1]}

			# since hop is an optional parameter after we get this
			# position we need to check if we got the hop or gateway
			# parameter.  Set gateway is always of the form ip@intf,
			# then we can simply check for the '@' character in the
			# string.  if it exists then we don't have a hop but a
			# gateway.  If we don't then we assume that a hop exists
			# and a gateway follows it
			if [[ "$gatewayorhop" == *@* ]]; then
				gateway=$gatewayorhop
				priority=${tokens[2]}
			else
				hop=$gatewayorhop
				gateway=${tokens[2]}
				priority=${tokens[3]}
			fi

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

			# Write the translated line into the file.
			echo -n "$network: { gateway: $gateway"
			[ -n "$hop" ] && echo -n ", hop: $hop"
			[ -n "$priority" ] && echo -n ", priority: $priority"
			echo " }"
		done >> "$outfile"
	done < "$infile"
	echo "$progname: converted routes written to $outfile"
}

read_and_parse $1 $2