#!/bin/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.
#
# Starts a WEBHCat server
#
# chkconfig: 2345 85 15
# description: WEBHCat server
# pidfile: $WEBHCAT_PID_DIR/webhcat.pid
### BEGIN INIT INFO
# Provides:          hive-webhcat-server
# Short-Description: WEBHCat server
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Required-Start:    $syslog $remote_fs
# Required-Stop:     $syslog $remote_fs
# Should-Start:
# Should-Stop:
### END INIT INFO

. /lib/lsb/init-functions
BIGTOP_DEFAULTS_DIR=${BIGTOP_DEFAULTS_DIR-/etc/default}
[ -n "${BIGTOP_DEFAULTS_DIR}" -a -r ${BIGTOP_DEFAULTS_DIR}/hadoop ] && . ${BIGTOP_DEFAULTS_DIR}/hadoop
[ -n "${BIGTOP_DEFAULTS_DIR}" -a -r ${BIGTOP_DEFAULTS_DIR}/hive-webhcat-server ] && . ${BIGTOP_DEFAULTS_DIR}/hive-webhcat-server

# Autodetect JAVA_HOME if not defined
. /usr/lib/bigtop-utils/bigtop-detect-javahome

RETVAL_SUCCESS=0

STATUS_RUNNING=0
STATUS_DEAD=1
STATUS_DEAD_AND_LOCK=2
STATUS_NOT_RUNNING=3
STATUS_OTHER_ERROR=102


ERROR_PROGRAM_NOT_INSTALLED=5
ERROR_PROGRAM_NOT_CONFIGURED=6


RETVAL=0
SLEEP_TIME=5
PROC_NAME="java"

DAEMON="hive-webhcat-server"
DESC="WEBHCat server"
EXEC_PATH="$HIVE_HOME-hcatalog/sbin/webhcat_server.sh"
SVC_USER="hcat"
DAEMON_FLAGS=""
CONF_DIR="${HIVE_HOME}-hcatalog/etc/webhcat"
CONF_FILE=""
LOGFILE=""
PIDFILE="$WEBHCAT_PID_DIR/webhcat.pid"
LOCKDIR="/var/lock/subsys"
LOCKFILE="$LOCKDIR/hive-webhcat-server"
WORKING_DIR="${HIVE_HOME}-hcatalog"

install -d -m 0755 -o hcat -g hcat $WEBHCAT_PID_DIR 1>/dev/null 2>&1 || :
[ -d "$LOCKDIR" ] || install -d -m 0755 $LOCKDIR 1>/dev/null 2>&1 || :

start() {
  [ -x $EXEC_PATH ] || exit $ERROR_PROGRAM_NOT_INSTALLED
  [ -d $CONF_DIR ] || exit $ERROR_PROGRAM_NOT_CONFIGURED

  runuser -s /bin/bash $SVC_USER -c "cd $WORKING_DIR && $EXEC_PATH --config '$CONF_DIR' start $DAEMON_FLAGS"

  # Some processes are slow to start
  sleep $SLEEP_TIME
  checkstatusofproc
  RETVAL=$?

  if [ $RETVAL -eq $STATUS_RUNNING ]; then
    touch $LOCKFILE
    log_success_msg "Started ${DESC}: "
  else
	log_failure_msg "Failed to start ${DESC}. Return value: $RETVAL"
  fi
  return $RETVAL
}


stop() {
  start_daemon $EXEC_PATH --config "$CONF_DIR" stop $DAEMON_FLAGS
  RETVAL=$?

  if [ $RETVAL -eq $RETVAL_SUCCESS ]; then
	 log_success_msg "Stopped ${DESC}: "
	 rm -f $LOCKFILE $PIDFILE
 else
	 log_failure_msg "Failed to stop ${DESC}. Return value: $RETVAL."
 fi
}

restart() {
  stop
  start
}

checkstatusofproc(){
  pidofproc -p $PIDFILE $PROC_NAME > /dev/null
}

checkstatus(){
  checkstatusofproc
  status=$?
  case "$status" in
    $STATUS_RUNNING)
      log_success_msg "${DESC} is running"
      ;;
    $STATUS_DEAD)
      log_failure_msg "${DESC} is dead and pid file exists"
      ;;
    $STATUS_DEAD_AND_LOCK)
      log_failure_msg "${DESC} is dead and lock file exists"
      ;;
    $STATUS_NOT_RUNNING)
      log_failure_msg "${DESC} is not running"
      ;;
    *)
      log_failure_msg "${DESC} status is unknown"
      ;;
  esac
  return $status
}

condrestart(){
  [ -e $LOCKFILE ] && restart || :
}

check_for_root() {
  if [ $(id -ur) -ne 0 ]; then
    echo 'Error: root user required'
    echo
    exit 1
  fi
}

service() {
  case "$1" in
    start)
      check_for_root
      start
      ;;
    stop)
      check_for_root
      stop
      ;;
    status)
      checkstatus
      RETVAL=$?
      ;;
    restart|force-reload)
      check_for_root
      restart
      ;;
    condrestart|try-restart)
      check_for_root
      condrestart
      ;;
    *)
      echo $"Usage: $0 {start|stop|status|restart|try-restart|condrestart|force-reload}"
      exit 1
  esac
}

service "$@"

exit $RETVAL
