#!/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.

function hadoop_usage
{
  echo "Usage: yarn [--config confdir] [--daemon (start|stop|status)] COMMAND"
  echo "where COMMAND is one of:"
  echo "  application                           prints application(s) report/kill application"
  echo "  applicationattempt                    prints applicationattempt(s) report"
  echo "  classpath                             prints the class path needed to get the"
  echo "                                        Hadoop jar and the required libraries"
  echo "  container                             prints container(s) report"
  echo "  daemonlog                             get/set the log level for each daemon"
  echo "  jar <jar>                             run a jar file"
  echo "  logs                                  dump container logs"
  echo "  node                                  prints node report(s)"
  echo "  nodemanager                           run a nodemanager on each slave"
  echo "  proxyserver                           run the web app proxy server"
  echo "  resourcemanager                       run the ResourceManager"
  echo "  resourcemanager -format-state-store   deletes the RMStateStore"
  echo "  rmadmin                               admin tools"
  echo "  timelineserver                        run the timeline server"
  echo "  version                               print the version"
  echo " or"
  echo "  CLASSNAME                             run the class named CLASSNAME"
  echo "Most commands print help when invoked w/o parameters."
}


# let's locate libexec...
if [[ -n "${HADOOP_PREFIX}" ]]; then
  DEFAULT_LIBEXEC_DIR="${HADOOP_PREFIX}/libexec"
else
  this="${BASH_SOURCE-$0}"
  bin=$(cd -P -- "$(dirname -- "${this}")" >/dev/null && pwd -P)
  DEFAULT_LIBEXEC_DIR="${bin}/../libexec"
fi

HADOOP_LIBEXEC_DIR="${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}"
# shellcheck disable=SC2034
HADOOP_NEW_CONFIG=true
if [[ -f "${HADOOP_LIBEXEC_DIR}/yarn-config.sh" ]]; then
  . "${HADOOP_LIBEXEC_DIR}/yarn-config.sh"
else
  echo "ERROR: Cannot execute ${HADOOP_LIBEXEC_DIR}/yarn-config.sh." 2>&1
  exit 1
fi

# if no args specified, show usage
if [[ $# = 0 ]]; then
  hadoop_exit_with_usage 1
fi

# get arguments
COMMAND=$1
shift

case "${COMMAND}" in
  application|applicationattempt|container)
    CLASS=org.apache.hadoop.yarn.client.cli.ApplicationCLI
    hadoop_debug "Append YARN_CLIENT_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_CLIENT_OPTS}"
    set -- "${COMMAND}" "$@"
  ;;
  classpath)
    hadoop_finalize
    echo "${CLASSPATH}"
    exit
  ;;
  daemonlog)
    CLASS=org.apache.hadoop.log.LogLevel
    hadoop_debug "Append YARN_CLIENT_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_CLIENT_OPTS}"
  ;;
  jar)
    CLASS=org.apache.hadoop.util.RunJar
    hadoop_debug "Append YARN_CLIENT_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_CLIENT_OPTS}"
  ;;
  historyserver)
    daemon="true"
    echo "DEPRECATED: Use of this command to start the timeline server is deprecated." 1>&2
    echo "Instead use the timelineserver command for it." 1>&2
    echo "Starting the History Server anyway..." 1>&2
    CLASS='org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryServer'
  ;;
  logs)
    CLASS=org.apache.hadoop.yarn.client.cli.LogsCLI
    hadoop_debug "Append YARN_CLIENT_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_CLIENT_OPTS}"
  ;;
  node)
    CLASS=org.apache.hadoop.yarn.client.cli.NodeCLI
    hadoop_debug "Append YARN_CLIENT_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_CLIENT_OPTS}"
  ;;
  nodemanager)
    daemon="true"
    CLASS='org.apache.hadoop.yarn.server.nodemanager.NodeManager'
    hadoop_debug "Append YARN_NODEMANAGER_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_NODEMANAGER_OPTS}"
    if [[ -n "${YARN_NODEMANAGER_HEAPSIZE}" ]]; then
      JAVA_HEAP_MAX="-Xmx${YARN_NODEMANAGER_HEAPSIZE}m"
    fi
  ;;
  proxyserver)
    daemon="true"
    CLASS='org.apache.hadoop.yarn.server.webproxy.WebAppProxyServer'
    hadoop_debug "Append YARN_PROXYSERVER_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_PROXYSERVER_OPTS}"
    if [[ -n "${YARN_PROXYSERVER_HEAPSIZE}" ]]; then
      JAVA_HEAP_MAX="-Xmx${YARN_PROXYSERVER_HEAPSIZE}m"
    fi
  ;;
  resourcemanager)
    daemon="true"
    CLASS='org.apache.hadoop.yarn.server.resourcemanager.ResourceManager'
    YARN_OPTS="${YARN_OPTS} ${YARN_RESOURCEMANAGER_OPTS}"
    hadoop_debug "Append YARN_RESOURCEMANAGER_OPTS onto YARN_OPTS"
    if [[ -n "${YARN_RESOURCEMANAGER_HEAPSIZE}" ]]; then
      JAVA_HEAP_MAX="-Xmx${YARN_RESOURCEMANAGER_HEAPSIZE}m"
    fi
  ;;
  rmadmin)
    CLASS='org.apache.hadoop.yarn.client.cli.RMAdminCLI'
    hadoop_debug "Append YARN_CLIENT_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_CLIENT_OPTS}"
  ;;
  timelineserver)
    daemon="true"
    CLASS='org.apache.hadoop.yarn.server.applicationhistoryservice.ApplicationHistoryServer'
    hadoop_debug "Append YARN_TIMELINESERVER_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_TIMELINESERVER_OPTS}"
    if [[ -n "${YARN_TIMELINESERVER_HEAPSIZE}" ]]; then
      JAVA_HEAP_MAX="-Xmx${YARN_TIMELINESERVER_HEAPSIZE}m"
    fi
  ;;
  version)
    CLASS=org.apache.hadoop.util.VersionInfo
    hadoop_debug "Append YARN_CLIENT_OPTS onto YARN_OPTS"
    YARN_OPTS="${YARN_OPTS} ${YARN_CLIENT_OPTS}"
  ;;
  *)
    CLASS="${COMMAND}"
    if ! hadoop_validate_classname "${CLASS}"; then
      hadoop_exit_with_usage 1
    fi
  ;;
esac

# set HADOOP_OPTS to YARN_OPTS so that we can use
# finalize, etc, without doing anything funky
hadoop_debug "Resetting HADOOP_OPTS=YARN_OPTS"
# shellcheck disable=SC2034
HADOOP_OPTS="${YARN_OPTS}"

daemon_outfile="${HADOOP_LOG_DIR}/hadoop-${HADOOP_IDENT_STRING}-${COMMAND}-${HOSTNAME}.out"
daemon_pidfile="${HADOOP_PID_DIR}/hadoop-${HADOOP_IDENT_STRING}-${COMMAND}.pid"

if [[  "${HADOOP_DAEMON_MODE}" != "default" ]]; then
  # shellcheck disable=SC2034
  HADOOP_ROOT_LOGGER="${HADOOP_DAEMON_ROOT_LOGGER}"
  YARN_ROOT_LOGGER="${HADOOP_DAEMON_ROOT_LOGGER}"
  HADOOP_LOGFILE="hadoop-${HADOOP_IDENT_STRING}-${COMMAND}-${HOSTNAME}.log"
fi

hadoop_add_param HADOOP_OPTS Xmx "${JAVA_HEAP_MAX}"

# Add YARN custom options to comamnd line in case someone actaully 
# used these.
#
# Note that we are replacing ' ' with '\ ' so that when we exec
# stuff it works
#
hadoop_add_param HADOOP_OPTS yarn.log.dir "-Dyarn.log.dir=${HADOOP_LOG_DIR/ /\ }"
hadoop_add_param HADOOP_OPTS yarn.log.file "-Dyarn.log.file=${HADOOP_LOGFILE/ /\ }"
hadoop_add_param HADOOP_OPTS yarn.home.dir "-Dyarn.home.dir=${HADOOP_YARN_HOME/ /\ }"
hadoop_add_param HADOOP_OPTS yarn.root.logger "-Dyarn.root.logger=${YARN_ROOT_LOGGER:-INFO,console}"

hadoop_finalize

if [[ -n "${daemon}" ]]; then
  if [[ -n "${secure_service}" ]]; then
    hadoop_secure_daemon_handler "${HADOOP_DAEMON_MODE}" "${COMMAND}" \
    "${CLASS}" "${daemon_pidfile}" "${daemon_outfile}" \
    "${priv_pidfile}" "${priv_outfile}" "${priv_errfile}" "$@"
  else
    hadoop_daemon_handler "${HADOOP_DAEMON_MODE}" "${COMMAND}" "${CLASS}" \
    "${daemon_pidfile}" "${daemon_outfile}" "$@"
  fi
  exit $?
else
  hadoop_java_exec "${COMMAND}" "${CLASS}" "$@"
fi