#!/bin/bash

. /etc/init.d/functions

retval=0
prog=varnishlog
pidfile=/var/run/xvarnish/varnishlog.pid
binlog=/var/log/xvarnish/errorvsl.bin

# The VSL query, we only record requests matching the below conditions:
# Any of:
#  - Any requests with these tag(s) present: Error, FetchError, VCL_Error, ESI_xmlerror
#  - Any requests with 503 status in reponse to client
#  - Ignore requests where the frontend's client aborted\lost their TCP connection

VSLQ="(VCL_Error,Error,VSL,FetchError,ESI_xmlerror or RespStatus == 503) and not {1-}Debug ~ 'Connection reset by peer'"
DAEMON_OPTS="-D -P $pidfile -t off -g request -q \"$VSLQ\" -a -w $binlog"

check_status() {
	status -p $pidfile $prog >/dev/null 2>&1
}

start() {
	check_status && stop
	echo -n "Starting $prog: "

	ulimit -u 2048
	ulimit -u 10240
	ulimit -u unlimited
	ulimit -n 131072

	daemon --user varnish --pidfile $pidfile $prog $DAEMON_OPTS
	retval=$?
	echo
	return $retval
}

stop() {
	check_status || return 0
	echo -n "Stopping $prog: "
	killproc -p $pidfile $prog
	retval=$?
	echo
	return $retval
}


# Start daemonized varnishlog
start

# Configure logrotate for weekly log rotation
cat <<- EOF > /etc/logrotate.d/xvarnish-errorvsl
$binlog {
  notifempty
  dateext
  rotate 5
  missingok
  create 0600 varnish varnish
  postrotate
    /bin/kill -HUP \`cat $pidfile 2>/dev/null\` 2> /dev/null || true
  endscript
}
EOF