#!/bin/bash
#
# sailing	Starts sailing services
#
# chkconfig: 2345 95 10
# description: Sailing contains all sailing services

# Source function library.
. /etc/init.d/functions

RETVAL=0

JAVA_START_INSTANCES="server"
SERVERS_DIR=/home/sailing/servers
GIT_REPOSITORY=/home/sailing/code
APACHE_CONFIG_DIR=/etc/httpd/conf.d
rm /var/log/sailing.out
rm /var/log/sailing.err

start_tmux() {
	su - sailing -c "/home/sailing/bin/tmuxConsole.sh unattended"
	success
}

start_servers() {
	NUMBER_OF_INSTANCES=`echo "$JAVA_START_INSTANCES" | wc -w`
	MEMORY_PER_INSTANCE_IN_MB=`cat /proc/meminfo  | grep MemTotal | awk '{printf("%i\n", ($2 / 1024 * 0.75 - 1500) / '$NUMBER_OF_INSTANCES' );}'`
	echo "Using ${MEMORY_PER_INSTANCE_IN_MB}MB as default heap size per instance."
	for conf in $JAVA_START_INSTANCES; do
		echo "Checking for amazon update..." >>/var/log/sailing.out
		echo "MEMORY=\"${MEMORY_PER_INSTANCE_IN_MB}m\"" >>$SERVERS_DIR/$conf/env.sh
		su - sailing -c "cd $SERVERS_DIR/$conf && $GIT_REPOSITORY/java/target/refreshInstance.sh auto-install" 2>>/var/log/sailing.err >>/var/log/sailing.out
		(
			# execute env.sh in a subshell which now has the same set of variables that the server will see
			source $SERVERS_DIR/$conf/env.sh
			echo "Starting Java server \"$conf\"" >>/var/log/sailing.out
			su - sailing -c "cd $SERVERS_DIR/$conf && ./start" 2>>/var/log/sailing.err >>/var/log/sailing.out
			server_name="`echo $SERVER_NAME | tr [A-Z] [a-z]`"
			echo "Appending macro invocation to $APACHE_CONFIG_DIR/001-events.conf to map ${server_name}.sapsailing.com to event with ID $EVENT_ID with server running on local port $SERVER_PORT..." >>/var/log/sailing.out
			echo "Use Event ${server_name}.sapsailing.com \"$EVENT_ID\" 127.0.0.1 $SERVER_PORT" >>$APACHE_CONFIG_DIR/001-events.conf
			HTTP_LOGROTATE=/etc/logrotate.d/httpd
			echo "Patching $HTTP_LOGROTATE so that old logs go to /var/log/old/$SERVER_NAME/$INSTANCE_IP4" >>/var/log/sailing.out
			sed -i -e "s/\/var\/log\/old\/\([^/]*\)\/\([^/ ]*\)/\/var\/log\/old\/$SERVER_NAME\/$INSTANCE_IP4/" $HTTP_LOGROTATE
			# terminating the subshell will forget all the variable assignments brought in by env.sh, clearing for the next server instance
		)
		RETVAL=$?
		[ $RETVAL -eq 0 ] && success || failure
	done
	launch_httpd
}

stop_servers() {
	for conf in $JAVA_START_INSTANCES; do
		echo "Stopping Java server $conf"
		su - sailing -c "cd $SERVERS_DIR/$conf && ./stop"
		RETVAL=$?
		[ $RETVAL -eq 0 ] && success || failure
	done
}

# launch_httpd(server_name, port, event_id)
launch_httpd() {
	echo "Will try to launch httpd so this replica can work with an ELB easily." >>/var/log/sailing.out
	if [ -x /etc/init.d/httpd ]; then
		FIRST_SERVER=`echo $JAVA_START_INSTANCES | awk '{print $1;}'`
		source $SERVERS_DIR/$FIRST_SERVER/env.sh
		# Append Apache macro invocation for /internal-server-status based on mod_status and INSTANCE_DNS to $APACHE_CONFIG_DIR/001-events.conf
		echo "Appending macro usage for $INSTANCE_DNS/internal-server-status URL for mod_status based Apache monitoring to $APACHE_CONFIG_DIR/001-events.conf" >>/var/log/sailing.out
		echo "Use Status $INSTANCE_DNS internal-server-status" >>$APACHE_CONFIG_DIR/001-events.conf
		echo "Launching httpd..." >>/var/log/sailing.out
		service httpd start
	else
		echo Can't launch httpd; start script doesn't seem to be installed at /etc/init.d/httpd
	fi
}

# See how we were called.
case "$1" in
  start)
	start_servers
        ;;
  stop)
	stop_servers
	;;
  status)
	status java
	RETVAL=$?
	;;
  *)
        echo $"Usage: $0 {start|status|stop}"
        RETVAL=3
esac

exit $RETVAL