#!/bin/bash


# (1) Init.
#--------------------------------------------------------#
# (1) Get current absolute dir
ROOT=$(dirname `realpath $0`);

# (2) Check argc
test $# -lt 2 && echo -e "error: too fewarguments\n\n\e[1mUSAGE\e[0m\n\tbind-input <id> <port>\n\n\e[1mARGUMENTS\e[0m\n\t<id>\tThe identifier of the input (buffer name)\n\t<port>\tTo port to listen to\n" && exit 1;

# (3) Check @PORT range #
MIN_PORT=49152;
MAX_PORT=65535;
test "$2" -gt "$MAX_PORT" -o "$2" -lt "$MIN_PORT" && echo "error: <port> must be between $MIN_PORT and $MAX_PORT" && exit 1;

# (4) Set argument explicit names #
IN_ID="$1";
IN_PT="$2";



# (2) Prepare buffer
#--------------------------------------------------------#
# (1) Create buffer path
BUFFER="/tmp/inbuf_$IN_ID";

# (2) Create/Flush buffer
test -f $BUFFER && rm $BUFFER;
touch $BUFFER;




# (3) Launch INPUT server
#--------------------------------------------------------#
(

	trap "kill -9 %1 2>/dev/null" INT KILL;
	infail=0;

	# (1) kill script after 10 failures
	while [ $infail -lt 10 ]; do

		echo "failures: $infail";

		# (2) bind socket to buffer
		echo "(.) binding :$IN_PT to $BUFFER";

		( nc -lp $IN_PT >> $BUFFER 2> /dev/null && infail="0" || ( infail=`expr $infail + 1`; exit 1 ) || echo "    * cannot access :$IN_PT" )&
		wait $!;

	done;

)&
LOOP_PID=$!;


# (2) Remove buffer + kill loop #
trap "rm $BUFFER 2>/dev/null; kill -9 $LOOP_PID 2>/dev/null" INT KILL;

wait $LOOP_PID;