#!/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 Hadoop httpfs
#
# chkconfig: 2345 90 10
# description: Hadoop httpfs
# pidfile: /var/run/hadoop/httpfs/hadoop-httpfs-httpfs.pid
### BEGIN INIT INFO
# Provides:          hadoop-httpfs
# Short-Description: Hadoop httpfs
# 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}/hadoop-httpfs ] && . ${BIGTOP_DEFAULTS_DIR}/hadoop-httpfs

# 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="hadoop-httpfs"
DESC="Hadoop httpfs"
EXEC_PATH="/usr/odp/current/hadoop-httpfs/sbin/httpfs.sh"
SVC_USER="httpfs"
DAEMON_FLAGS="httpfs"
CONF_DIR="/usr/odp/current/hadoop-httpfs/../hadoop/conf"
CONF_FILE=""
LOGFILE=""
PIDFILE="/var/run/hadoop/httpfs/hadoop-httpfs-httpfs.pid"
LOCKDIR="/var/lock/subsys"
LOCKFILE="$LOCKDIR/hadoop-httpfs"
WORKING_DIR="/var/run/hadoop-httpfs"

install -d -m 0755 -o httpfs -g httpfs /var/run/hadoop/httpfs 1>/dev/null 2>&1 || :
[ -d "$LOCKDIR" ] || install -d -m 0755 $LOCKDIR 1>/dev/null 2>&1 || :

export HTTPFS_USER="$SVC_USER"
export HTTPFS_CONFIG="$CONF_DIR"
export HTTPFS_LOG=${HTTPFS_LOG:-"/var/log/hadoop-httpfs/"}
export HTTPFS_TEMP="$(dirname $PIDFILE)"
export HTTPFS_SLEEP_TIME="$SLEEP_TIME"
export CATALINA_BASE=${CATALINA_BASE:-"/etc/hadoop-httpfs/tomcat-deployment"}
export CATALINA_PID="$PIDFILE"
export CATALINA_TMPDIR="$HTTPFS_TEMP"

install -d -m 0755 -o ${HTTPFS_USER} -g ${HTTPFS_USER} ${HTTPFS_LOG} 1>/dev/null 2>&1 || :

start() {
  [ -x $EXEC_PATH ] || exit $ERROR_PROGRAM_NOT_INSTALLED
  [ -d $CONF_DIR ] || exit $ERROR_PROGRAM_NOT_CONFIGURED
  log_success_msg "Starting ${DESC}: "

  su -s /bin/bash -c "${EXEC_PATH} start $DAEMON_FLAGS" $HTTPFS_USER

  for second in {5..0}
  do
    checkstatusofproc
    RETVAL=$?
    if [ "$RETVAL" -eq $RETVAL_SUCCESS ] ; then
      break
    fi
    sleep 1
  done

  [ $RETVAL -eq $RETVAL_SUCCESS ] && touch $LOCKFILE
  return $RETVAL
}
stop() {
  log_success_msg "Stopping ${DESC}: "
  # FIXME: workaround for BIGTOP-537
  checkstatusofproc
  if [ "$?" = "$STATUS_RUNNING" ] ; then
    su -s /bin/bash $SVC_USER -c "${EXEC_PATH} stop $SLEEP_TIME -force"
    RETVAL=$?
  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
