#!/usr/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 ZooKeeper REST Server
#
# chkconfig: 345 85 15
# description: ZooKeeper REST Server
# pidfile: /var/run/zookeeper/zookeeper-rest-zookeeper.pid
### BEGIN INIT INFO
# Provides:          zookeeper-rest
# Short-Description: ZooKeeper REST Server
# Default-Start:     3 4 5
# Default-Stop:      0 1 2 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}/zookeeper-rest ] && . ${BIGTOP_DEFAULTS_DIR}/zookeeper-rest

# 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="zookeeper-rest"
DESC="ZooKeeper REST Server"
EXEC_PATH=""
SVC_USER="zookeeper"
DAEMON_FLAGS=""
CONF_DIR="/etc/zookeeper/conf/rest"
CONF_FILE=""
LOGFILE=""
PIDFILE="/var/run/zookeeper/zookeeper-rest-zookeeper.pid"
LOCKDIR="/var/lock/subsys"
LOCKFILE="$LOCKDIR/zookeeper-rest"
WORKING_DIR="/var/run/zookeeper"

install -d -m 0755 -o zookeeper -g zookeeper /var/run/zookeeper 1>/dev/null 2>&1 || :
[ -d "$LOCKDIR" ] || install -d -m 0755 $LOCKDIR 1>/dev/null 2>&1 || :
start() {
  log_success_msg "Starting ${DESC}: "

  ZOOKEEPER_HOME=${ZOOKEEPER_HOME:-/usr/lib/zookeeper}
  CLASSPATH="${ZOOKEEPER_HOME}/contrib/rest/*:${ZOOKEEPER_HOME}/contrib/rest/lib/*"
  CLASSPATH="${ZOOKEEPER_HOME}/*:${ZOOKEEPER_HOME}/lib/*:${CONF_DIR}:${CLASSPATH}"
  CMD="${JAVA_HOME}/bin/java -cp ${CLASSPATH} org.apache.zookeeper.server.jersey.RestMain"

  LOG_FILE=/var/log/zookeeper/zookeeper-rest.out

  runuser -s /bin/bash -c "nohup ${CMD} > $LOG_FILE 2>&1 < /dev/null &"'echo $! '"> $PIDFILE" $SVC_USER

  [ $RETVAL -eq $RETVAL_SUCCESS ] && touch $LOCKFILE
  return $RETVAL
}
stop() {
  log_success_msg "Stopping ${DESC}: "
  checkstatusofproc
  if [ "$?" = "$STATUS_RUNNING" ] ; then
    if [ -f ${PIDFILE} ]; then
      PID=`cat ${PIDFILE}`
      if [ -n ${PID} ]; then
        kill -KILL ${PID} &>/dev/null
      fi
    fi
    RETVAL=$?
  else
    RETVAL=$RETVAL_SUCCESS
  fi

  [ $RETVAL -eq $RETVAL_SUCCESS ] && rm -f $LOCKFILE $PIDFILE
}
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
