#!/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.

MYNAME="${BASH_SOURCE-$0}"
HADOOP_SHELL_EXECNAME="${MYNAME##*/}"

## @description  build up the mapred command's usage text.
## @audience     public
## @stability    stable
## @replaceable  no
function hadoop_usage
{
  hadoop_add_subcommand "classpath" client "prints the class path needed for running mapreduce subcommands"
  hadoop_add_subcommand "envvars" client "display computed Hadoop environment variables"
  hadoop_add_subcommand "historyserver" daemon "run job history servers as a standalone daemon"
  hadoop_add_subcommand "hsadmin" admin "job history server admin interface"
  hadoop_add_subcommand "job" client "manipulate MapReduce jobs"
  hadoop_add_subcommand "pipes" client "run a Pipes job"
  hadoop_add_subcommand "queue" client "get information regarding JobQueues"
  hadoop_add_subcommand "sampler" client "sampler"
  hadoop_add_subcommand "version" client "print the version"
  hadoop_generate_usage "${HADOOP_SHELL_EXECNAME}" true
}

## @description  Default command handler for hadoop command
## @audience     public
## @stability    stable
## @replaceable  no
## @param        CLI arguments
function mapredcmd_case
{
  subcmd=$1
  shift

  case ${subcmd} in
    mradmin|jobtracker|tasktracker|groups)
      hadoop_error "Sorry, the ${subcmd} command is no longer supported."
      hadoop_error "You may find similar functionality with the \"yarn\" shell command."
      hadoop_exit_with_usage 1
    ;;
    classpath)
      hadoop_do_classpath_subcommand HADOOP_CLASSNAME "$@"
    ;;
    envvars)
      echo "JAVA_HOME='${JAVA_HOME}'"
      echo "HADOOP_MAPRED_HOME='${HADOOP_MAPRED_HOME}'"
      echo "MAPRED_DIR='${MAPRED_DIR}'"
      echo "MAPRED_LIB_JARS_DIR='${MAPRED_LIB_JARS_DIR}'"
      echo "HADOOP_CONF_DIR='${HADOOP_CONF_DIR}'"
      echo "HADOOP_TOOLS_HOME='${HADOOP_TOOLS_HOME}'"
      echo "HADOOP_TOOLS_DIR='${HADOOP_TOOLS_DIR}'"
      echo "HADOOP_TOOLS_LIB_JARS_DIR='${HADOOP_TOOLS_LIB_JARS_DIR}'"
      exit 0
    ;;
    historyserver)
      HADOOP_SUBCMD_SUPPORTDAEMONIZATION="true"
      HADOOP_CLASSNAME=org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer
      if [[ -n "${HADOOP_JOB_HISTORYSERVER_HEAPSIZE}" ]]; then
        HADOOP_HEAPSIZE_MAX="${HADOOP_JOB_HISTORYSERVER_HEAPSIZE}"
      fi
      HADOOP_DAEMON_ROOT_LOGGER=${HADOOP_JHS_LOGGER:-$HADOOP_DAEMON_ROOT_LOGGER}
      if [[  "${HADOOP_DAEMON_MODE}" != "default" ]]; then
        hadoop_add_param HADOOP_OPTS mapred.jobsummary.logger "-Dmapred.jobsummary.logger=${HADOOP_DAEMON_ROOT_LOGGER}"
      fi
    ;;
    hsadmin)
      HADOOP_CLASSNAME=org.apache.hadoop.mapreduce.v2.hs.client.HSAdmin
    ;;
    job)
      HADOOP_CLASSNAME=org.apache.hadoop.mapred.JobClient
    ;;
    pipes)
      HADOOP_CLASSNAME=org.apache.hadoop.mapred.pipes.Submitter
    ;;
    queue)
      HADOOP_CLASSNAME=org.apache.hadoop.mapred.JobQueueClient
    ;;
    sampler)
      HADOOP_CLASSNAME=org.apache.hadoop.mapred.lib.InputSampler
    ;;
    version)
      HADOOP_CLASSNAME=org.apache.hadoop.util.VersionInfo
    ;;
    *)
      HADOOP_CLASSNAME="${subcmd}"
      if ! hadoop_validate_classname "${HADOOP_CLASSNAME}"; then
        hadoop_exit_with_usage 1
      fi
    ;;
  esac
}

bin=$(cd -P -- "$(dirname -- "${MYNAME}")" >/dev/null && pwd -P)

# let's locate libexec...
if [[ -n "${HADOOP_HOME}" ]]; then
  HADOOP_DEFAULT_LIBEXEC_DIR="${HADOOP_HOME}/libexec"
else
  HADOOP_DEFAULT_LIBEXEC_DIR="${bin}/../libexec"
fi

HADOOP_LIBEXEC_DIR="${HADOOP_LIBEXEC_DIR:-$HADOOP_DEFAULT_LIBEXEC_DIR}"
HADOOP_NEW_CONFIG=true
if [[ -f "${HADOOP_LIBEXEC_DIR}/mapred-config.sh" ]]; then
  # shellcheck source=./hadoop-mapreduce-project/bin/mapred-config.sh
  . "${HADOOP_LIBEXEC_DIR}/mapred-config.sh"
else
  echo "ERROR: Cannot execute ${HADOOP_LIBEXEC_DIR}/mapred-config.sh." 2>&1
  exit 1
fi

# now that we have support code, let's abs MYNAME so we can use it later
MYNAME=$(hadoop_abs "${MYNAME}")

if [ $# = 0 ]; then
  hadoop_exit_with_usage 1
fi

HADOOP_SUBCMD=$1
shift

if hadoop_need_reexec mapred "${HADOOP_SUBCMD}"; then
  hadoop_uservar_su mapred "${HADOOP_SUBCMD}" \
    "${MYNAME}" \
    "--reexec" \
    "${HADOOP_USER_PARAMS[@]}"
  exit $?
fi

hadoop_verify_user_perm "${HADOOP_SHELL_EXECNAME}" "${HADOOP_SUBCMD}"

HADOOP_SUBCMD_ARGS=("$@")

if declare -f mapred_subcommand_"${HADOOP_SUBCMD}" >/dev/null 2>&1; then
  hadoop_debug "Calling dynamically: mapred_subcommand_${HADOOP_SUBCMD} ${HADOOP_SUBCMD_ARGS[*]}"
  "mapred_subcommand_${HADOOP_SUBCMD}" "${HADOOP_SUBCMD_ARGS[@]}"
else
  mapredcmd_case "${HADOOP_SUBCMD}" "${HADOOP_SUBCMD_ARGS[@]}"
fi

hadoop_add_client_opts

if [[ ${HADOOP_WORKER_MODE} = true ]]; then
  hadoop_common_worker_mode_execute "${HADOOP_MAPRED_HOME}/bin/mapred" "${HADOOP_USER_PARAMS[@]}"
  exit $?
fi

hadoop_subcommand_opts "${HADOOP_SHELL_EXECNAME}" "${HADOOP_SUBCMD}"

# everything is in globals at this point, so call the generic handler
hadoop_generic_java_subcmd_handler