#!/usr/bin/env python2


"""
Creates an ssh tunnel for using slaves on another network.
Launch a server on the front-end node of the cluster on which the master
process runs. Then start a client ont the front-end node of the distant
cluster.

Usage:
      qp_tunnel server EZFIO_DIR
      qp_tunnel client <address> EZFIO_DIR

Options:
    -h --help

"""

import os
import sys
import zmq

try:
    import qp_path
except ImportError:
    print "source .quantum_package.rc"
    raise

from docopt import docopt
from ezfio import ezfio


def get_address(filename):
  with open(os.path.join(filename,'work','qp_run_address'),'r') as f:
    a = f.readlines()[0].strip()
  return a


def set_address(filename,address):
  with open(os.path.join(filename,'work','qp_run_address'),'r') as f:
    backup = f.readlines()

  with open(os.path.join(filename,'work','qp_run_address'),'w') as f:
    f.write('\n'.join([address]+backup))


def main_server(arguments,filename):
    destination = get_address(filename)
    print destination


def main_client(arguments,filename):
    destination = arguments["<address>"]
    print destination


def main(arguments):
    """Main function"""

    print arguments
    filename = arguments["EZFIO_DIR"]

    if arguments["server"]:
        return main_server(arguments, filename)
    if arguments["client"]:
        return main_client(arguments, filename)

    
if __name__ == '__main__':
    ARGUMENTS = docopt(__doc__)
    main(ARGUMENTS)