#!/bin/bash
#!/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\ttrigger-wait <key> <port>\n\n\e[1mARGUMENTS\e[0m\n\t<key>\tThe key of the trigger (client must match it)\n\t<port>\tTo port to listen to\n" && exit 1;

# (3) Check @PORT range #
MIN_PORT=1024;
MAX_PORT=49151;
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 #
TRIGGER_KEY="$1";
TRIGGER_PORT="$2";

# (5) Create a temporary file #
TMPFILE="/dev/shm/trigger_wait_${TRIGGER_KEY}_pid";


# (6) Define on-exit routine #
LOOP_PID="";
on_exit(){

	echo "- killing loop";
	kill -INT $LOOP_PID 2>/dev/null;

	echo "- killing main listener ($TRIGGER_PID)";
	kill -INT $TRIGGER_PID 2>/dev/null;

	# delete tmp file
	echo "- deleting tmp file";
	rm $TMPFILE 2>/dev/null;

	exit 1;

}




# (2) Launch pool listener
#--------------------------------------------------------#
# (1) Bind-input #
echo -e "\e[32m+\e[0m listen $TRIGGER_PORT";
$ROOT/bind-input trigger $TRIGGER_PORT > $TMPFILE;
TRIGGER_PID="`cat $TMPFILE`";



# (3) Launch pool manager
#--------------------------------------------------------#
# infinite listener
(
	trap "on_exit;" HUP INT KILL TERM;

	while true; do

		# Listen on port @TRIGGER_PORT
		MSG=`$ROOT/read trigger`;

		# Do nothing if empty msg
		test -z "$MSG" && sleep .5 && continue;

		echo -e "  + received '\e[33m$MSG\e[0m'";

		# If wrong key
		test "$MSG" != "$TRIGGER_KEY" && echo "  + wrong key" && sleep .5 && continue;

		# If valid key
		echo "  + trigger received" && echo -e "\e[31m+\e[0m stop listening on $TRIGGER_PORT" && break;

	done;

)&
LOOP_PID=$!;

# (4) Set exit management
#--------------------------------------------------------#
# (1) Set trap for "exit" signals #
trap "kill -INT $LOOP_PID 2>/dev/null;" HUP INT KILL TERM;

# (2) Wait for main loop to end
wait $LOOP_PID;

on_exit;