#! /bin/bash

# The set -e option instructs bash to immediately exit if any command has a non-zero exit status
set -e

function printErr()
    {
        echo "usage: ./startup.sh <tag> <number_of_nodes_in_cluster>"
        echo "No argument $1 supplied"
    }

if [ -z "$1" ]
  then
    printErr "<tag>"
    exit 1
fi

if [ -z "$2" ]
  then
    printErr "<number_of_nodes_in_cluster>"
    exit 1
fi

TAG=$1
NODES=$2

# Check for AWS private key file (.pem file)
if [ ! -f "pem/bigchaindb.pem" ]
    then
        echo "File pem/bigchaindb.pem (AWS private key) is missing"
        exit 1
fi

# Change the file permissions on pem/bigchaindb.pem
# so that the owner can read it, but that's all
chmod 0400 pem/bigchaindb.pem

# The following Python script does these things:
# 0. allocates more elastic IP addresses if necessary,
# 1. launches the specified number of nodes (instances) on Amazon EC2,
# 2. tags them with the specified tag,
# 3. waits until those instances exist and are running,
# 4. for each instance, it associates an elastic IP address
#    with that instance,
# 5. writes the shellscript add2known_hosts.sh
# 6. (over)writes a file named hostlist.py
#    containing a list of all public DNS names.
python launch_ec2_nodes.py --tag $TAG --nodes $NODES 

# Make add2known_hosts.sh executable then execute it.
# This adds remote keys to ~/.ssh/known_hosts
chmod +x add2known_hosts.sh
./add2known_hosts.sh

# (Re)create the RethinkDB configuration file conf/rethinkdb.conf
python create_rethinkdb_conf.py

# rollout base packages (dependencies) needed before
# storage backend (rethinkdb) and bigchaindb can be rolled out
fab install_base_software

# rollout storage backend (rethinkdb)
fab install_rethinkdb

# rollout bigchaindb
fab install_bigchaindb

# generate genesis block
# HORST is the last public_dns_name listed in conf/rethinkdb.conf
# For example:
# ec2-52-58-86-145.eu-central-1.compute.amazonaws.com
HORST=`tail -1 conf/rethinkdb.conf|cut -d: -f1|cut -d= -f2`
fab -H $HORST -f fab_prepare_chain.py init_bigchaindb

# initiate sharding
fab start_bigchaindb_nodes

# cleanup
rm add2known_hosts.sh

# DONE