fastcgi manager

#!/bin/bash

PYTHON=/usr/bin/python
PIDFILE=/var/run/www/@SITE.pid
SOCKFILE=/var/run/www/@SITE.sock
COMMAND="$PYTHON ./manage.py runfcgi maxchildren=3 maxrequest=1000 minspare=1 maxspare=1 socket=@SOCKFILE pidfile=@PIDFILE"

usage() {
    echo "$0 {start|stop|restart} domain[domain]*"
    exit 1
}

daemon_command() {
    SITE_SOCKFILE=${SOCKFILE/@SITE/$1}
    SITE_PIDFILE=${PIDFILE/@SITE/$1}
    COMMAND=${COMMAND/@SOCKFILE/$SITE_SOCKFILE}
    COMMAND=${COMMAND/@PIDFILE/$SITE_PIDFILE}
    echo -n $COMMAND
}

daemon_pids() {
    echo $(ps axwwo pid,command|grep "$(daemon_command $1)"|grep -v grep|cut -c 1-6)
}


start() {
    if [ -z "$1" ]; then usage; fi
    for SITE in $1; do
        PIDS=$(daemon_pids $SITE)
        if [ -n "$PIDS" ]; then
            echo "$SITE daemon already running"
        else
            echo "Loading $SITE daemon"
            DIR=/web/$SITE/web_site
            if [ ! -e $DIR ]; then
                echo "$DIR does not exist"
            else
                cd $DIR
                $(daemon_command $SITE)
            fi
        fi
    done
}

stop() {
    if [ -z "$1" ]; then usage; fi
    for SITE in $1; do
        PIDS=$(daemon_pids $SITE)
        if [ -n "$PIDS" ]; then
            echo "Killing old $SITE daemons"
            for pid in $PIDS; do
                kill $pid
            done
        else
            echo "No $SITE daemons running"
        fi
    done
}

pids() {
    if [ -z "$1" ]; then usage; fi
    for SITE in $1; do
        echo "$SITE pids: $(daemon_pids $SITE)"
    done
}

restart() {
    if [ -z "$1" ]; then usage; fi
    for SITE in $1; do
        stop $1
        sleep 2
        start $1
    done
}


action=$1
shift
case $action in
    "start") start "$*";;
    "stop") stop "$*";;
    "pids") pids "$*";;
    "restart") restart "$*";;
    *) echo $(usage);;
esac