#!/usr/bin/env bash
### BEGIN INIT INFO
# Provides:          redis-server
# Required-Start:    $syslog
# Required-Stop:     $syslog
# Should-Start:      $local_fs
# Should-Stop:       $local_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: redis-server - Persistent key-value db
# Description:       redis-server - Persistent key-value db
### END INIT INFO
#
# Author:  Wayne E. Seguin <wayneeseguin@gmail.com>
# License: The same licence as Redis, New BSD
#          http://www.opensource.org/licenses/bsd-license.php
#

# Source the system config file, if it exists.
if [[ -s /etc/conf.d/redis ]] ; then
  source /etc/conf.d/redis
fi

# Default config variables that have not been set.
port="${port:-6379}"
prefix="${prefix:-/opt/rhoconnect}"
redis="${prefix}/bin/redis-server"
redis_cli="${prefix}/bin/redis-cli"
pidfile="${pidfile:-/var/run/redis.pid}"
config="${config:-/opt/rhoconnect/etc/redis.conf}"
user="${user:-root}"
#prefix="${prefix:-/usr/local}"
#config="${config:-/usr/local/etc/redis.conf}"
#pidfile="${pidfile:-/var/run/redis/redis.pid}"
#config="${config:-/etc/redis/redis.conf}"
#user="${user:-redis}"

#
# Set the running $pid value based on $pidfile.
#
if [[ -s "$pidfile" ]] ; then
  pid=$(cat $pidfile)
else
  rm -f $pidfile
fi

# In case there was pidfile corruption...
if [[ "Linux" = "$(uname)" ]] ; then
  # /proc does not exist on say, Darwin
  if [[ ! -z "${pid}" ]] && [[ ! -x "/proc/${pid}" ]] ;then
    pid="$(ps auxww | grep [r]edis | grep "$config" | grep -v 'grep' | awk '{print $2}')"
  elif [[ -z "${pid}" ]] ; then
    pid="$(ps auxww | grep [r]edis | grep "$config" | grep -v 'grep' | awk '{print $2}')"
  fi
else
  if [[ -z "${pid}" ]] ; then
    pid="$(ps auxww | grep [r]edis | grep "$config" | grep -v 'grep' | awk '{print $2}')"
  fi
fi

#
# Start redis using redis-server as user 'redis'.
#
redis_start() {
  if [[ -f $pidfile ]] ; then
    echo "$pidfile exists, redis-server is either already running or crashed."
    exit 1
  elif [[ ! -z "$pid" ]] ; then
    echo -e "\nRedis is already running with configuration '$config'."
    echo "$pid" > $pidfile # Ensure pidfile exists with the pid.
  else
    echo "Starting Redis server..."
    su $user -c "$redis $config"
    exit 0
  fi
}

#
# Stop redis using redis-cli SHUTDOWN.
#
redis_stop() {
  echo -n "Stopping redis server on port ${port} ... "
  "$redis_cli" -p ${port} SHUTDOWN

  # Keep user informed while server shuts down.
  echo "Waiting for the redis server to shutdown "

  if [[ "Linux" = "$(uname)" ]] ; then
    if [[ "${pid}" = "" ]] ; then
      echo "redis server is not running."
      # Clear out the old pidfile if available
      rm -f $pidfile
      exit 1
    fi
    while [[ -x /proc/${pid} ]] ; do
      echo -n '.' ; sleep 1
    done
  else # Darwin, etc...
    while [[ ! -z "$(ps auxww | grep [r]edis | grep "$config" | awk '{print $2}')" ]] ; do
      echo -n '.' ; sleep 1
    done
  fi

  # Clear out the old pidfile.
  rm -f $pidfile

  # Notify user of successful completion.
  echo -e "redis server stopped."
  exit 0
}

redis_usage() {
  echo -e "Usage: $0 {start,stop}"
  exit 1
}

#
# CLI logic.
#
case "$1" in
  start) redis_start ;;
  stop)  redis_stop  ;;
  *)     redis_usage ;;
esac