PHP fast-cgi pool balancer management script

gistfile1.sh

#!/bin/bash

pool1=pool_1
pool2=pool_2

port1=8031
port2=8032

nbport1=0
nbport2=0

getPoolFromPort() {
	case "$1" in
		
		"$port1")
			echo $pool1
			;;
		
		
		"$port2")
			echo $pool2
			;;
		
		*)
			echo fucked
			return 1
			;;
	esac
	
	return 0
}

getOldestPHP() {
	pids=$( lsof -b -F p -n -P  -sTCP:LISTEN -i :$port1 ; lsof -b -F p -n -P  -sTCP:LISTEN -i :$port2 )
	
	arg=
	for pid in $pids; do
		arg="$arg -p ${pid//p/} "
	done
	
	ps $arg -o pid,lstart k lstart | tail -n +2 | head -n 1 | awk '{ print $1 }'
}

getPortFromPid() {
	lsof -n -P -b -F n -p $1 -a -i TCP -s TCP:LISTEN  2>/dev/null | grep ^n | cut -d ':' -f 2
}

# count unique ports from different php-cgi instances
nbport1=$( lsof -b -F p -n -P -sTCP:LISTEN -i :$port1 | wc -l )
nbport2=$( lsof -b -F p -n -P -sTCP:LISTEN -i :$port2 | wc -l )

if [ $nbport1 -gt 0 -a $nbport2 -gt 0 ]; then
# blocked situation : both ports port1 and port2 are in LISTEN status
	oldest=$( getOldestPHP )
	oport=$( getPortFromPid $oldest )
    # kill every process listening on $port
	for opid in $( lsof -b -F p -n -P  -i :$oport -sTCP:LISTEN ); do
		pid=${opid//p/}
		echo "killing old php process $pid"
		kill -9 $pid
	done
fi

# count again to see if we unlocked the situation
nbport1=$( lsof -b -F p -n -P -sTCP:LISTEN -i :$port1 | wc -l )
nbport2=$( lsof -b -F p -n -P -sTCP:LISTEN -i :$port2 | wc -l )
if [ $nbport1 -gt 0 -a $nbport2 -gt 0 ]; then
	echo "previous unlock was unsuccessfull !"
	exit
fi

if [ $nbport1 -eq 0 -a $nbport2 -eq 0 ]; then
	# no more PHP running, shit happenned
	# let's start pool number 1
	echo "no php running, starting first pool $pool1"
	/etc/init.d/spawn-fcgi start $pool1
elif [ $nbport1 -eq 0 -a $nbport2 -gt 0 ]; then
	/etc/init.d/spawn-fcgi start $pool1
	sleep 1
	/etc/init.d/spawn-fcgi stop $pool2
elif [ $nbport2 -eq 0 -a $nbport1 -gt 0 ]; then
	/etc/init.d/spawn-fcgi start $pool2
	sleep 1
	/etc/init.d/spawn-fcgi stop $pool1
fi