#!/bin/bash
###########################################
#                                        ##
#  CRON SCRIPT FOR SYNC BETWEEN SERVERS  ##
#                                        ##
###########################################
function st_self_ts()
{
        if [ -s "$CAP_STATUS_FILE" ] ; then
                LINE="$(sed -ne "${1}p" "$CAP_STATUS_FILE")"
        fi
        echo $LINE
}
function st_self_fix()
{
        [ "$1" ] || exit 1
        LINE="$1"
        shift
        [ "$1" ] || exit 1
        VALUE="$1"
        sed -e "$LINE s/.*/$VALUE/" $CAP_STATUS_FILE
}
CAPNAME="$1"
VARS_LLXCFG="CAP_TIME_TOLERANCE CAP_LIMIT_CHALLENGE"
eval $(llxcfg-showvars $VARS_LLXCFG)
HOSTNAME=$(hostname -f)
CAPBASEDIR="/var/lib/lliurex-cap/${CAPNAME}"
CAP_STATUS_FILE="$CAPBASEDIR/status/${HOSTNAME}.cap"
STATUS="$(st_self_ts 5)"
NOW="$(date +%Y%m%d%H%M%S)"
NEW_TS="$(st_self_ts 1)"
DIFF="$(( ( NOW - NEW_TS ) / 10 ))"

if [ "$STATUS" -eq 0 ] ; then
	#
	# SERVER IS WAITING. 
	#
	if [ "$DIFF" -le "$CAP_TIME_TOLERANCE" ]; then
		exit 0
	fi
	#
	# Search Leader to sync
	#
	# Join on one line all content of all server file status. By this line get update status for server. Next print this line and name file. Order by line to get server more updated. First server on this list is leader. Get status file leader, that the name is FQDN of LEADER.
	#
	IPLEADER="{find ${CAPBASEDIR}/status/ -type f -name "*.cap" | while read f; do cat "$f" | tr -d "\n"; echo ":$f" ; done ; }|sort -r -t : -k 1 | head -1 | cut -d : -f 2"
	if [ -n "$IPLEADER" -o  "$HOSTNAME" != "$IPLEADER" ] ; then
                lliurex-cap sync-by-rsync $CAPNAME $IPLEADER
        fi
	#
        # If I'm the leader or aren't, i do nothing and change my status to standar
        # else i sync with leader and chage my status to standar.
        # By to two way server is sync ( I'm leader or i'm updated )
        #
	t_self_fix "5" "1"
else
        if [ "$DIFF" -le "$CAP_LIMIT_CHALLENGE" ]; then
                exit 0
        fi
	#
	# Should be launch challenge
	#
	RANK="$(st_self_ts 3)"
	LUCK="$(st_self_ts 4)"
	TTS="$(( 9 - RANK + LUCK ))"
	sleep $TTS
	NOW="$(date +%Y%m%d%H%M%S)"
	NEW_TS="$(st_self_ts 1)"
	DIFF="$(( ( NOW - NEW_TS ) / 10 ))"
	if [ "$DIFF" -le "$CAP_LIMIT_CHALLENGE" ]; then
        	exit 0
	fi
	t_self_fix "1" "${NOW}0"
	t_self_fix "2" "${NEW_TS}"
fi
csync2 -C "${CAPNAME}status" -xr || true