#!/bin/sh -e
# ============================================
#  celeryd - Starts the Celery worker daemon.
# ============================================
#
# :Usage: /etc/init.d/celeryd {start|stop|force-reload|restart|try-restart|status}
# :Configuration file: /etc/default/celeryd
#
# See http://docs.celeryproject.org/en/latest/tutorials/daemonizing.html#generic-init-scripts 


### BEGIN INIT INFO
# Provides:          celeryd
# 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 task worker daemon
### END INIT INFO

#set -e

DEFAULT_PID_FILE="/var/run/celery/%n.pid"
DEFAULT_LOG_FILE="/var/log/celery/%n.log"
DEFAULT_LOG_LEVEL="INFO"
DEFAULT_NODES="celery"
DEFAULT_CELERYD="-m celery worker --detach"

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

CELERY_DEFAULTS=${CELERY_DEFAULTS:-"/etc/default/celeryd"}

test -f "$CELERY_DEFAULTS" && . "$CELERY_DEFAULTS"
if [ -f "/etc/default/celeryd" ]; then
    . /etc/default/celeryd
fi

CELERY_CREATE_RUNDIR=0
CELERY_CREATE_LOGDIR=0
if [ -z "$CELERYD_PID_FILE" ]; then
    CELERYD_PID_FILE="$DEFAULT_PID_FILE"
    CELERY_CREATE_RUNDIR=1
fi
if [ -z "$CELERYD_LOG_FILE" ]; then
    CELERYD_LOG_FILE="$DEFAULT_LOG_FILE"
    CELERY_CREATE_LOGDIR=1
fi

CELERYD_LOG_LEVEL=${CELERYD_LOG_LEVEL:-${CELERYD_LOGLEVEL:-$DEFAULT_LOG_LEVEL}}
CELERYD_MULTI=${CELERYD_MULTI:-"celery multi"}
CELERYD=${CELERYD:-$DEFAULT_CELERYD}
CELERYCTL=${CELERYCTL:="celery"}
CELERYD_NODES=${CELERYD_NODES:-$DEFAULT_NODES}

export CELERY_LOADER

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

CELERYD_LOG_DIR=`dirname $CELERYD_LOG_FILE`
CELERYD_PID_DIR=`dirname $CELERYD_PID_FILE`

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

if [ -n "$CELERYD_CHDIR" ]; then
    DAEMON_OPTS="$DAEMON_OPTS --workdir=\"$CELERYD_CHDIR\""
fi


check_dev_null() {
    if [ ! -c /dev/null ]; then
        echo "/dev/null is not a character device!"
        exit 75  # EX_TEMPFAIL
    fi
}


maybe_die() {
    if [ $? -ne 0 ]; then
        echo "Exiting: $* (errno $?)"
        exit 77  # EX_NOPERM
    fi
}

create_default_dir() {
    if [ ! -d "$1" ]; then
        echo "- Creating default directory: '$1'"
        mkdir -p "$1"
        maybe_die "Couldn't create directory $1"
        echo "- Changing permissions of '$1' to 02755"
        chmod 02755 "$1"
        maybe_die "Couldn't change permissions for $1"
        if [ -n "$CELERYD_USER" ]; then
            echo "- Changing owner of '$1' to '$CELERYD_USER'"
            chown "$CELERYD_USER" "$1"
            maybe_die "Couldn't change owner of $1"
        fi
        if [ -n "$CELERYD_GROUP" ]; then
            echo "- Changing group of '$1' to '$CELERYD_GROUP'"
            chgrp "$CELERYD_GROUP" "$1"
            maybe_die "Couldn't change group of $1"
        fi
    fi
}


check_paths() {
    if [ $CELERY_CREATE_LOGDIR -eq 1 ]; then
        create_default_dir "$CELERYD_LOG_DIR"
    fi
    if [ $CELERY_CREATE_RUNDIR -eq 1 ]; then
        create_default_dir "$CELERYD_PID_DIR"
    fi
}

create_paths() {
    create_default_dir "$CELERYD_LOG_DIR"
    create_default_dir "$CELERYD_PID_DIR"
}

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


stop_workers () {
    $CELERYD_MULTI stopwait $CELERYD_NODES --pidfile="$CELERYD_PID_FILE"
}


start_workers () {
    $CELERYD_MULTI start $CELERYD_NODES $DAEMON_OPTS        \
                         --pidfile="$CELERYD_PID_FILE"      \
                         --logfile="$CELERYD_LOG_FILE"      \
                         --loglevel="$CELERYD_LOG_LEVEL"    \
                         --cmd="$CELERYD"                   \
                         $CELERYD_OPTS
}


restart_workers () {
    $CELERYD_MULTI restart $CELERYD_NODES $DAEMON_OPTS      \
                           --pidfile="$CELERYD_PID_FILE"    \
                           --logfile="$CELERYD_LOG_FILE"    \
                           --loglevel="$CELERYD_LOG_LEVEL"  \
                           --cmd="$CELERYD"                 \
                           $CELERYD_OPTS
}



case "$1" in
    start)
        check_dev_null
        check_paths
        start_workers
    ;;

    stop)
        check_dev_null
        check_paths
        stop_workers
    ;;

    reload|force-reload)
        echo "Use restart"
    ;;

    status)
        $CELERYCTL status $CELERYCTL_OPTS
    ;;

    restart)
        check_dev_null
        check_paths
        restart_workers
    ;;
    try-restart)
        check_dev_null
        check_paths
        restart_workers
    ;;
    create-paths)
        check_dev_null
        create_paths
    ;;
    check-paths)
        check_dev_null
        check_paths
    ;;
    *)
        echo "Usage: /etc/init.d/celeryd {start|stop|restart|kill|create_paths}"
        exit 64  # EX_USAGE
    ;;
esac

exit 0