metron-interface/metron-alerts/scripts/metron-alerts-ui

#!/usr/bin/env bash
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# metron alerts UI service
# chkconfig: - 20 80
# description: Alerts UI
# processname: metron-alerts-ui
#

# all LSB compliant distributions provide the following
# http://refspecs.linuxbase.org/LSB_3.0.0/LSB-PDA/LSB-PDA/iniscrptfunc.html
if [ -f /lib/lsb/init-functions ]; then
    . /lib/lsb/init-functions
fi

NAME=metron-alerts-ui
DESC="Metron Alerts UI"
METRON_VERSION=${project.version}
METRON_HOME=/usr/metron/$METRON_VERSION
METRON_LOG_DIR="/var/log/metron"
METRON_PID_DIR="/var/run/metron"
METRON_USER="metron"
METRON_GROUP="metron"
METRON_SYSCONFIG="/etc/default/metron"
if [ -f "$METRON_SYSCONFIG" ]; then
    set -a
    . "$METRON_SYSCONFIG"
fi

PIDFILE="$METRON_PID_DIR/$NAME.pid"

DAEMON="node $METRON_HOME/web/expressjs/alerts-server.js -c $METRON_HOME/config/alerts_ui.yml"

#
# start the rest application
#
start() {

  # if pidfile exists, do not start another
  if [ -f $PIDFILE ]; then
      PID=`cat $PIDFILE`
      printf "OK [$PID]\n"
      return
  fi

  if [ ! -d "$METRON_LOG_DIR" ]; then
      mkdir -p "$METRON_LOG_DIR" && chown "$METRON_USER":"$METRON_GROUP" "$METRON_LOG_DIR"
  fi

  if [ ! -d "$METRON_PID_DIR" ]; then
      mkdir -p "$METRON_PID_DIR" && chown "$METRON_USER":"$METRON_GROUP" "$METRON_PID_DIR"
  fi

  # kick-off the daemon
  CMD="$DAEMON >> $METRON_LOG_DIR/$NAME.log 2>&1 & echo \$!"
  PID=`su -c "$CMD" $METRON_USER`

  if [ -z $PID ]; then
      printf "Fail\n"
  else
      echo $PID > $PIDFILE
      printf "Ok [$PID]\n"
  fi
}

#
# stop the rest application
#
stop() {
  if [ -f $PIDFILE ]; then
    PID=`cat $PIDFILE`
    while sleep 1
      echo -n "."
      kill -0 $PID >/dev/null 2>&1
    do
      kill $PID
    done
    rm -f $PIDFILE
    printf "%s\n" "Ok"
  else
      printf "%s\n" "Not running"
  fi
}

#
# status check of the rest application
#
status() {
  if [ -f $PIDFILE ]; then
    PID=`cat $PIDFILE`
    if [ -z "`ps axf | grep ${PID} | grep -v grep`" ]; then
      printf "%s\n" "Process dead but pidfile exists"
    else
      echo "Running"
    fi
  else
    printf "%s\n" "Service not running"
  fi
}

case "$1" in

  ##############################################################################
  # start
  #
  start)
    printf "%-50s \n" "Starting $NAME..."
    start
  ;;

  ##############################################################################
  # status
  #
  status)
    printf "%-50s \n" "Checking $NAME..."
    status
  ;;

  ##############################################################################
  # stop
  #
  stop)
    printf "%-50s \n" "Stopping $NAME..."
    stop
  ;;

  ##############################################################################
  # restart
  #
  restart)
    $0 stop
    $0 start
  ;;

  ##############################################################################
  # reload
  #
  reload)
  ;;

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