#!/usr/bin/python
import sys
import time
import transmissionrpc
import os.path

USER = 'admin'
PASS = 'foobar'
PORT = 9091
HOST = 'localhost'
SLEEP_SECONDS = 20

if __name__ == '__main__':

    if len(sys.argv) != 2:
        sys.stderr.write('usage: <logfile>\n')
        sys.exit(1)

    log_file = sys.argv[1]

    tc = transmissionrpc.Client(HOST, PORT, USER, PASS)
    client_set = set()

    if os.path.isfile(log_file):
        f = open(log_file)
        for line in f:
            slash24 = line.strip()
            client_set.add(slash24)
        f.close()

    f = open(log_file, 'a')

    while 1:
        try:
            torrent_list = tc.get_torrents()
            for torrent in torrent_list:
	            for peer in torrent.peers:
                    ipAddress = peer['address']
                    slash24 = ipAddress[:ipAddress.rfind('.')]+'.0'

                    if slash24 not in client_set:
                        client_set.add(slash24)
                        print('logged %s' % slash24)
                        f.write('%s\n' % slash24)

            f.flush() #write out all new clients
            time.sleep(SLEEP_SECONDS)
        except KeyboardInterrupt:
            break

    f.close()