text: import os, re
  import subprocess
  import itertools
  import argparse
  
  if __name__ == "__main__":
      parser = argparse.ArgumentParser(description='Generate configuration file for a batch of replicas')
      parser.add_argument('--prefix', type=str, default='hotstuff.gen')
      parser.add_argument('--ips', type=str, default=None)
      parser.add_argument('--iter', type=int, default=10)
      parser.add_argument('--pport', type=int, default=10000)
      parser.add_argument('--cport', type=int, default=20000)
      parser.add_argument('--keygen', type=str, default='./hotstuff-keygen')
      parser.add_argument('--pvss-setup', type=str, default='./pvss-setup')
      parser.add_argument('--tls-keygen', type=str, default='./hotstuff-tls-keygen')
      parser.add_argument('--nodes', type=str, default='nodes.txt')
      parser.add_argument('--block-size', type=int, default=1)
      parser.add_argument('--pace-maker', type=str, default='rr')
      args = parser.parse_args()
  
  
      if args.ips is None:
          ips = ['127.0.0.1']
      else:
          ips = [l.strip() for l in open(args.ips, 'r').readlines()]
      prefix = args.prefix
      iter = args.iter
      base_pport = args.pport
      base_cport = args.cport
      keygen_bin = args.keygen
      tls_keygen_bin = args.tls_keygen
      pvss_setup_bin = args.pvss_setup
  
      main_conf = open("{}.conf".format(prefix), 'w')
      nodes = open(args.nodes, 'w')
      replicas = ["{}:{};{}".format(ip, base_pport + i, base_cport + i)
                  for ip in ips
                  for i in range(iter)]
      p = subprocess.Popen([keygen_bin, '--num', str(len(replicas))],
                          stdout=subprocess.PIPE, stderr=open(os.devnull, 'w'))
      keys = [[t[4:] for t in l.decode('ascii').split()] for l in p.stdout]
      tls_p = subprocess.Popen([tls_keygen_bin, '--num', str(len(replicas))],
                          stdout=subprocess.PIPE, stderr=open(os.devnull, 'w'))
      tls_keys = [[t[4:] for t in l.decode('ascii').split()] for l in tls_p.stdout]
  
      subprocess.Popen([pvss_setup_bin, "--num", str(len(replicas))], stdout =subprocess.PIPE, stderr=open(os.devnull, 'w'))
  
      if not (args.block_size is None):
          main_conf.write("block-size = {}\n".format(args.block_size))
      if not (args.pace_maker is None):
          main_conf.write("pace-maker = {}\n".format(args.pace_maker))
      main_conf.write("stat-period = -1\n")
      main_conf.write("nworker = 2\n")
      for r in zip(replicas, keys, tls_keys, itertools.count(0)):
          main_conf.write("replica = {}, {}, {}\n".format(r[0], r[1][0], r[2][2]))
          r_conf_name = "{}-sec{}.conf".format(prefix, r[3])
          nodes.write("{}:{}\t{}\n".format(r[3], r[0], r_conf_name))
          r_conf = open(r_conf_name, 'w')
          r_conf.write("privkey = {}\n".format(r[1][1]))
          r_conf.write("tls-privkey = {}\n".format(r[2][1]))
          r_conf.write("tls-cert = {}\n".format(r[2][0]))
          r_conf.write("idx = {}\n".format(r[3]))
          r_conf.write("pvss-ctx = pvss-sec{}.conf\n".format(r[3]))
          r_conf.write("pvss-dat = pvss-setup.dat\n".format(r[3]))
  
  