#!/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 an EC2 HBase master.

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

CLUSTER=$1

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

if [ -z $AWS_ACCOUNT_ID ]; then
  echo "Please set AWS_ACCOUNT_ID in $bin/hbase-ec2-env.sh."
  exit 1
fi

type=$MASTER_INSTANCE_TYPE
[ -z "$type" ] && type=$SLAVE_INSTANCE_TYPE
arch=$MASTER_ARCH
[ -z "$arch" ] && arch=$SLAVE_ARCH

echo "Testing for existing master in group: $CLUSTER"
MASTER_EC2_HOST=`ec2-describe-instances $TOOL_OPTS | awk '"RESERVATION" == $1 && "'$CLUSTER_MASTER'" == $4, "RESERVATION" == $1 && "'$CLUSTER_MASTER'" != $4'`
MASTER_EC2_HOST=`echo "$MASTER_EC2_HOST" | awk '"INSTANCE" == $1 && "running" == $6 {print $4}'`

if [ ! -z "$MASTER_EC2_HOST" ]; then
  echo "Master already running on: $MASTER_EC2_HOST"
  MASTER_HOST=`ec2-describe-instances $TOOL_OPTS $INSTANCE | grep INSTANCE | grep running | grep $MASTER_EC2_HOST | awk '{print $5}'`
  echo $MASTER_HOST > $MASTER_PRIVATE_IP_PATH
  echo $MASTER_EC2_HOST > $MASTER_IP_PATH
  exit 0
fi

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

# Start a master
echo "Starting master with AMI $AMI_IMAGE (arch $arch)"
# Substituting zookeeper quorum
ZOOKEEPER_QUORUM=`cat $ZOOKEEPER_QUORUM_PATH`
sed -e "s|%ZOOKEEPER_QUORUM%|$ZOOKEEPER_QUORUM|" \
    -e "s|%EXTRA_PACKAGES%|$EXTRA_PACKAGES|" \
    "$bin"/$USER_DATA_FILE > "$bin"/$USER_DATA_FILE.master
INSTANCE=`ec2-run-instances $AMI_IMAGE $TOOL_OPTS -n 1 -g $CLUSTER_MASTER -k root -f "$bin"/$USER_DATA_FILE.master -t $type | grep INSTANCE | awk '{print $2}'`
echo -n "Waiting for instance $INSTANCE to start"
while true; do
  printf "."
  # get private dns
  MASTER_HOST=`ec2-describe-instances $TOOL_OPTS $INSTANCE | grep running | awk '{print $5}'`
  if [ ! -z $MASTER_HOST ]; then
    echo " Started as $MASTER_HOST"
    break;
  fi
  sleep 1
done
rm -f "$bin"/$USER_DATA_FILE.master

MASTER_EC2_HOST=`ec2-describe-instances $TOOL_OPTS $INSTANCE | grep INSTANCE | grep running | grep $MASTER_HOST | awk '{print $4}'`
echo $MASTER_HOST > $MASTER_PRIVATE_IP_PATH
echo $MASTER_EC2_HOST > $MASTER_IP_PATH
MASTER_EC2_ZONE=`ec2-describe-instances $TOOL_OPTS $INSTANCE | grep INSTANCE | grep running | grep $MASTER_HOST | awk '{print $11}'`
echo $MASTER_EC2_ZONE > $MASTER_ZONE_PATH

while true; do
  REPLY=`ssh $SSH_OPTS "root@$MASTER_EC2_HOST" 'echo "hello"'`
  if [ ! -z $REPLY ]; then
   break;
  fi
  sleep 5
done

scp $SSH_OPTS $EC2_ROOT_SSH_KEY "root@$MASTER_EC2_HOST:/root/.ssh/id_rsa"
ssh $SSH_OPTS "root@$MASTER_EC2_HOST" "chmod 600 /root/.ssh/id_rsa"

MASTER_IP=`dig +short $MASTER_EC2_HOST`
echo "Master is $MASTER_EC2_HOST, ip is $MASTER_IP, zone is $MASTER_EC2_ZONE."