#!/bin/bash -e
# =========================================================
#  celerybeat - Starts the Celery periodic task scheduler.
# =========================================================
#
# :Usage: /etc/init.d/celerybeat {start|stop|force-reload|restart|try-restart|status}
#
# :Configuration file: /etc/default/celerybeat or /etc/default/celeryd
#
# EXAMPLE CONFIGURATION
# =====================
#
# this is an example configuration for a Python project:
#
# /etc/default/celeryd:
#
#   # Where to chdir at start.
#   CELERYD_CHDIR="/opt/Myproject/"
#
#   # Extra arguments to celeryd
#   CELERYD_OPTS="--time-limit=300"
#
#   # Extra arguments to celerybeat
#   CELERYBEAT_OPTS="--schedule=/var/run/celerybeat-schedule"
#
#   # Name of the celery config module.#
#   CELERY_CONFIG_MODULE="celeryconfig"
#
# EXAMPLE DJANGO CONFIGURATION
# ============================
#
#   # Where the Django project is.
#   CELERYD_CHDIR="/opt/Project/"
#
#   # Name of the projects settings module.
#   export DJANGO_SETTINGS_MODULE="settings"
#
#   # Path to celeryd
#   CELERYD="/opt/Project/manage.py celeryd"
#
#   # Path to celerybeat
#   CELERYBEAT="/opt/Project/manage.py"
#
#   # Extra arguments to celerybeat
#   CELERYBEAT_OPTS="celerybeat --schedule=/var/run/celerybeat-schedule"
#
# AVAILABLE OPTIONS
# =================
#
#   * CELERYBEAT_OPTS
#       Additional arguments to celerybeat, see `celerybeat --help` for a
#       list.
#
#   * CELERYBEAT_PID_FILE
#       Full path to the pidfile. Default is /var/run/celeryd.pid.
#
#   * CELERYBEAT_LOG_FILE
#       Full path to the celeryd logfile. Default is /var/log/celeryd.log
#
#   * CELERYBEAT_LOG_LEVEL
#       Log level to use for celeryd. Default is INFO.
#
#   * CELERYBEAT
#       Path to the celeryd program. Default is `celeryd`.
#       You can point this to an virtualenv, or even use manage.py for django.
#
#   * CELERYBEAT_USER
#       User to run celeryd as. Default is current user.
#
#   * CELERYBEAT_GROUP
#       Group to run celeryd as. Default is current user.
#
#   * VIRTUALENV
#       Full path to the virtualenv environment to activate. Default is none.

### BEGIN INIT INFO
# Provides:          celerybeat
# Required-Start:    $network $local_fs $remote_fs
# Required-Stop:     $network $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: celery periodic task scheduler
### END INIT INFO

set -e

DEFAULT_PID_FILE="/var/run/celerybeat.pid"
DEFAULT_LOG_FILE="/var/log/celerybeat.log"
DEFAULT_LOG_LEVEL="INFO"
DEFAULT_CELERYBEAT="celerybeat"

# /etc/init.d/ssh: start and stop the celery task worker daemon.

if test -f /etc/default/celeryd; then
    . /etc/default/celeryd
fi

if test -f /etc/default/celerybeat; then
    . /etc/default/celerybeat
fi

CELERYBEAT=${CELERYBEAT:-$DEFAULT_CELERYBEAT}
CELERYBEAT_PID_FILE=${CELERYBEAT_PID_FILE:-${CELERYBEAT_PIDFILE:-$DEFAULT_PID_FILE}}
CELERYBEAT_LOG_FILE=${CELERYBEAT_LOG_FILE:-${CELERYBEAT_LOGFILE:-$DEFAULT_LOG_FILE}}
CELERYBEAT_LOG_LEVEL=${CELERYBEAT_LOG_LEVEL:-${CELERYBEAT_LOGLEVEL:-$DEFAULT_LOG_LEVEL}}

export CELERY_LOADER

CELERYBEAT_OPTS="$CELERYBEAT_OPTS -f $CELERYBEAT_LOG_FILE -l $CELERYBEAT_LOG_LEVEL"

if [ -n "$2" ]; then
    CELERYBEAT_OPTS="$CELERYBEAT_OPTS $2"
fi

# Extra start-stop-daemon options, like user/group.
if [ -n "$CELERYBEAT_USER" ]; then
    DAEMON_OPTS="$DAEMON_OPTS --uid $CELERYBEAT_USER"
fi
if [ -n "$CELERYBEAT_GROUP" ]; then
    DAEMON_OPTS="$DAEMON_OPTS --gid $CELERYBEAT_GROUP"
fi

CELERYBEAT_CHDIR=${CELERYBEAT_CHDIR:-$CELERYD_CHDIR}
if [ -n "$CELERYBEAT_CHDIR" ]; then
    DAEMON_OPTS="$DAEMON_OPTS --workdir $CELERYBEAT_CHDIR"
fi


check_dev_null() {
    if [ ! -c /dev/null ]; then
        echo "/dev/null is not a character device!"
        exit 1
    fi
}


export PATH="${PATH:+$PATH:}/usr/sbin:/sbin"


wait_pid () {
    pid=$1
    forever=1
    i=0
    while [ $forever -gt 0 ]; do
        kill -0 $pid 1>/dev/null 2>&1
        if [ ! $? ]; then
            echo "OK"
            forever=0
        else
            kill -TERM "$pid"
            i=$((i + 1))
            if [ $i -gt 60 ]; then
                echo "ERROR"
                echo "Timed out while stopping (30s)"
                forever=0
            else
                sleep 0.5
            fi
        fi
    done
}


stop_beat () {
    echo -n "Stopping celerybeat... "
    if [ -f "$CELERYBEAT_PID_FILE" ]; then
        wait_pid $(cat "$CELERYBEAT_PID_FILE")
    else
        echo "NOT RUNNING"
    fi
}

start_beat () {
    echo "Starting celerybeat..."
    if [ -n "$VIRTUALENV" ]; then
        source $VIRTUALENV/bin/activate
    fi
    $CELERYBEAT $CELERYBEAT_OPTS $DAEMON_OPTS --detach \
                --pidfile="$CELERYBEAT_PID_FILE"
}



case "$1" in
  start)
    check_dev_null
    start_beat
    ;;
  stop)
    stop_beat
    ;;
  reload|force-reload)
    echo "Use start+stop"
    ;;
  restart)
    echo "Restarting celery periodic task scheduler"
    stop_beat
    start_beat
    ;;

  *)
    echo "Usage: /etc/init.d/celerybeat {start|stop|restart}"
    exit 1
esac

exit 0
