kwapi

#!/bin/bash
### BEGIN INIT INFO
# Provides:          kwapi
# Required-Start:    $network
# Required-Stop:     $network
# Default-Start:     2 3 5
# Default-Stop:      0 6
# short-description: configure kwapi to monitor energy on sites
# Description: energy monitoring, RRD, live visualization, long-term storage, ganglia
### END INIT INFO
#set -e

# Author: Laurent Pouilloux, François Rossigneux
#
PREFIX=/usr/bin/
DESC="Energy monitoring service"
NAME=kwapi
SCRIPTNAME=/etc/init.d/kwapi
USER=kwapi
LOG_FILE="/var/log/kwapi/kwapi.log"

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions

# Create required directories
[ -d /var/log/kwapi ] || mkdir -p /var/log/kwapi
[ -d /var/lib/kwapi ] || mkdir -p /var/lib/kwapi

# Give permissions to $USER
chown -R $USER:$USER /var/log/kwapi /var/lib/kwapi

# Read configuration
if [ -r /etc/kwapi/daemon.conf ]; then
    . /etc/kwapi/daemon.conf
    kwapi_elements=`compgen -A variable | grep KWAPI`
else
    echo 'Unable to read configuration file, abort ..'
    exit 1
fi

pid_element () {
    echo /var/run/$1.pid
}

# Start only if daemon is not running
daemon_start () {
    EXEC=${1//_/-}
    log_action_msg "Starting ${EXEC,,}" >> $LOG_FILE
    PID=$(pid_element $1)
    if !( status_of_proc -p $PID ${PREFIX}${EXEC,,} ${EXEC,,} > /dev/null ); then
        start-stop-daemon --start --make-pidfile --pidfile $PID --chuid $USER --background --startas /bin/bash -- -c "exec ${PREFIX}${EXEC,,} 2>> $LOG_FILE"
    else
        log_warning_msg "${EXEC,,} is already running" >> $LOG_FILE
    fi
    sleep 1
}

daemon_stop () {
    EXEC=${1//_/-}
    log_action_msg "Stopping ${EXEC,,}" >> $LOG_FILE
    PID=$(pid_element $1)
    start-stop-daemon --stop --pidfile $PID 2>> $LOG_FILE
}

daemon_status () {
    EXEC=${1//_/-}
    PID=$(pid_element $1)
    status_of_proc -p $PID ${PREFIX}${EXEC,,} ${EXEC,,} && return 0 || return $?
}

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    for element in $kwapi_elements
    do
        if eval "$"$element; then
            daemon_start $element
        fi
    done
    ;;
  stop)
    for element in $kwapi_elements
    do
        if eval "$"$element; then
            daemon_stop $element
        fi
    done
    ;;
  restart)
    $0 stop
    $0 start
  ;;
  status)
    # Return != 0 if one of the daemon failed
    FAIL=0
    for element in $kwapi_elements
    do
        if eval "$"$element; then
            daemon_status $element || let "FAIL=1"
        fi
    done
    exit $FAIL
  ;;
  *)
    echo "Usage: /etc/init.d/kwapi {start|stop|restart|status}"
    exit 1
    ;;
esac

exit 0