#!/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.

# Launch the EC2 HBase Zookeepers.

if [ -z $1 ]; then
  echo "Cluster name required!"
  exit 1
fi

if [ -z $2 ]; then
  echo "Must specify the number of zookeeper quorum peers to start."
  exit 1
fi

CLUSTER=$1
NO_INSTANCES=$2

# Import variables
bin=`dirname "$0"`
bin=`cd "$bin"; pwd`
. "$bin"/hbase-ec2-env.sh

type=$ZOO_INSTANCE_TYPE
[ -z "$type" ] && type=$SLAVE_INSTANCE_TYPE
arch=$ZOO_ARCH
[ -z "$arch" ] && arch=$SLAVE_ARCH

# Finding HBase image
[ -z "$ZOO_AMI_IMAGE" ] && ZOO_AMI_IMAGE=`ec2-describe-images $TOOL_OPTS -a | grep $S3_BUCKET | grep hbase | grep $HBASE_VERSION-$arch |grep available | awk '{print $2}'`

# Start Zookeeper instances

echo "Starting ZooKeeper quorum ensemble."

peers=""
public_names=""
inst=0
while [ $inst -lt $NO_INSTANCES ] ; do
  echo "Starting an AMI with ID $ZOO_AMI_IMAGE (arch $arch) in group $CLUSTER_ZOOKEEPER"
  INSTANCE=`ec2-run-instances $ZOO_AMI_IMAGE $TOOL_OPTS -n 1 -g $CLUSTER_ZOOKEEPER -k root -t $type | grep INSTANCE | awk '{print $2}'`
  echo -n "Waiting for instance $INSTANCE to start: "
  while true; do
    printf "."
    # get private dns
    priv=`ec2-describe-instances $TOOL_OPTS $INSTANCE | grep running | awk '{print $5}'`
    if [ ! -z $priv ]; then
      echo " Started ZooKeeper instance $INSTANCE as ${priv}"
      break
    fi
    sleep 1
  done
  peers="$peers $priv"
  public=`ec2-describe-instances $TOOL_OPTS $INSTANCE | grep running | awk '{print $4}'`
  echo "    Public DNS name is $public."
  public_names="$public_names $public"
  inst=$(($inst + 1))
done

ZOOKEEPER_QUORUM=`echo $peers | sed -e 's/ /,/g'`
echo $ZOOKEEPER_QUORUM  > $ZOOKEEPER_QUORUM_PATH
echo "ZooKeeper quorum is $ZOOKEEPER_QUORUM."

# Start Zookeeper quorum

sleep 10
echo "Initializing the ZooKeeper quorum ensemble."

for host in $public_names ; do 
  echo "    $host"
  scp $SSH_OPTS "$bin"/hbase-ec2-init-zookeeper-remote.sh "root@${host}:/var/tmp"
  ssh $SSH_OPTS "root@${host}" "sh -c \"ZOOKEEPER_QUORUM=\"$ZOOKEEPER_QUORUM\" sh /var/tmp/hbase-ec2-init-zookeeper-remote.sh\""
done