Cron daemon script

daemon.sh

#!/bin/sh
#
# DO NOT MOVE THIS FILE, KEEP IN ROOT OF APPLICATION
#
# This file should be called by a Cron job every 5 minutes.
# It will call the Cron Queue and starts processing.
# Each call also checks if processing is already in progress
# (in case of a gigantic queue) and starts a new 'worker' with a maximum of 3.

# Command to call
COMMAND='/usr/bin/php /../../../artisan queue:work'
LOCKFILE=/../../../queueDaemon.lock

# -----------------------------------------------------

start() {
  if [ -e ${LOCKFILE} ] && kill -0 `cat ${LOCKFILE}`; then
    echo "** Worker already running **"
  else
    echo "** Starting new worker **"
    echo `cat ${LOCKFILE}`

    rm -f ${LOCKFILE}
    # Execute the command and write its PID into the lockfile.
    $COMMAND & echo $! > ${LOCKFILE}
  fi

  return 0
}

stop() {
  if [ -e ${LOCKFILE} ]; then
    # Safely terminate the process found in the lockfile.
    kill -15 `cat ${LOCKFILE}`

    rm -f ${LOCKFILE}

    echo "** Stopped worker **"
  else
    echo "** No worker available to stop **"
  fi

  return 0
}

restart() {
  stop
  echo "** Initiating startup **"
  sleep 10s
  start
}

case "$1" in
start)
  start
  ;;
stop)
  stop
  ;;
restart)
  restart
  ;;
*)

  echo $"Usage: $0 {start|stop|restart}"
  exit 1
esac

exit 0