#!/usr/bin/python
"""Get hostnames for RHUI 3 servers in AWS """

from __future__ import print_function

import socket
import subprocess
import sys

if subprocess.call("which aws &> /dev/null", shell=True):
    sys.stderr.write("The aws client is not available. Please install package awscli.\n")
    sys.exit(1)

if subprocess.call("aws configure get aws_access_key_id &> /dev/null", shell=True):
    sys.stderr.write("The aws client is not configured. Please run `aws configure'.\n")
    sys.exit(1)

CMD = "aws ec2 describe-regions --all-regions --query 'Regions[].{Name:RegionName}' --output text"
CMD_OUT = subprocess.check_output(CMD, shell=True)
REGIONS = CMD_OUT.decode().splitlines()
REGIONS.sort()
HOST_TEMPLATE = "rhui3.%s.aws.ce.redhat.com"

LEGEND = "REGION_ID\tIP address of %s" % HOST_TEMPLATE
print(LEGEND % "REGION_ID")
for region in REGIONS:
    print("%s\t%s" % (region, socket.gethostbyname(HOST_TEMPLATE % region)))