#! /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
#
#   https://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.
#

#
# If this scripted is run out of /usr/bin or some other system bin directory
# it should be linked to and not copied. Things like java jar files are found
# relative to the canonical path of this script.
#

# Only follow symlinks if readlink supports it
if readlink -f "$0" &>/dev/null; then
  ZKREST=$(readlink -f "$0")
else
  ZKREST="$0"
fi
ZKREST_HOME=$(dirname "$ZKREST")

case "$(uname)" in
  CYGWIN* | MINGW*) cygwin=true ;;
  *) cygwin=false ;;
esac

if $cygwin; then
  # cygwin has a "kill" in the shell itself, gets confused
  KILL='/bin/kill'
else
  KILL='kill'
fi

if [[ -z $ZKREST_PIDFILE ]]; then
  ZKREST_PIDFILE=$ZKREST_HOME/server.pid
fi

ZKREST_MAIN=org.apache.zookeeper.server.jersey.RestMain

ZKREST_CONF=$ZKREST_HOME/conf
ZKREST_LOG=$ZKREST_HOME/zkrest.log

CLASSPATH="$ZKREST_CONF:$CLASSPATH"

for i in "$ZKREST_HOME"/lib/*.jar; do
  CLASSPATH="$i:$CLASSPATH"
done

for i in "$ZKREST_HOME"/zookeeper-*.jar; do
  CLASSPATH="$i:$CLASSPATH"
done
export CLASSPATH

case $1 in
  start)
    echo "Starting ZooKeeper REST Gateway ... "
    # shellcheck disable=SC2206
    flags=($JVMFLAGS)
    java "${flags[@]}" "$ZKREST_MAIN" &>"$ZKREST_LOG" &
    echo -n $! >"$ZKREST_PIDFILE"
    echo STARTED
    ;;
  stop)
    echo "Stopping ZooKeeper REST Gateway ... "
    if [[ ! -f $ZKREST_PIDFILE ]]; then
      echo "error: could not find file $ZKREST_PIDFILE"
      exit 1
    else
      $KILL -9 "$(cat "$ZKREST_PIDFILE")"
      rm "$ZKREST_PIDFILE"
      echo STOPPED
    fi
    ;;
  restart)
    shift
    "$0" stop "$@"
    sleep 3
    "$0" start "$@"
    ;;
  *)
    echo "Usage: $0 {start|stop|restart}" >&2
    ;;

esac