#!/bin/sh

# varnish rc script
# written by Matt Schurenko <matt.schurenko@gmail.com>

USAGE="usage: $0 start|stop|restart"
BIN='/usr/sbin/varnishd'
CONF='/etc/varnish/default.vcl'
PID='/var/run/varnish.pid'

##
# adjust the following variables accordingly
##
BACKING_FILE='/var/lib/varnish-cache'
ADMIN_IP='127.0.0.1'
ADMIN_PORT=8001
HTTP_IP='0.0.0.0'
HTTP_PORT=80
CACHE_SIZE='1g'
# ttl assigned to objects without ttl values (default 120s)
DEFAULT_TTL=604800 # 7 days
FILE_DESCRIPTORS=131072
MIN_THREADS=5
MAX_THREADS=500
THREAD_TIMEOUT=300
# maximum number of http headers (default is 64)
HTTP_HEADERS=384
# connection timout for backend (default is 0.4s)
CONNECT_TIMEOUT='4.0'

VARNISH_OPTS="-f $CONF \
              -s file,${BACKING_FILE},$CACHE_SIZE \
              -T $ADMIN_IP:${ADMIN_PORT} \
              -a $HTTP_IP:${HTTP_PORT} \
              -t $DEFAULT_TTL \
              -w${MIN_THREADS},${MAX_THREADS},${THREAD_TIMEOUT} \
              -P $PID"

VARNISH_PARAMS="-p http_headers=$HTTP_HEADERS \
               -p connect_timeout=$CONNECT_TIMEOUT"

varnish_start() {
	if [ -e $PID ];then
		if [ `pgrep varnishd|head -n1` == `cat $PID` ];then
			echo "varnish is already running"
			exit 1
		else # pid file must be stale
			"$PID exists but pid doesn't match pid of varnishd. please investigate."
			exit 2
		fi
	fi
	ulimit -n $FILE_DESCRIPTORS
	echo "starting varnish..."
	$BIN $VARNISH_OPTS $VARNISH_PARAMS
}
varnish_stop() {
	echo "stopping varnish..."
	killall `echo $BIN | awk -F'/' '{print $NF}'`
	if [ -e $PID ];then
		rm $PID
	fi
}

case "$1" in
	start)
		varnish_start
	;;
	stop)
		varnish_stop
	;;
	restart)
		varnish_stop
		sleep 1
		varnish_start
	;;
	*) echo -e $USAGE
	;;
esac