Sender.py

import sys
import getopt

import Checksum
import BasicSender

'''
This is a skeleton sender class. Create a fantastic transport protocol here.
'''
class Sender(BasicSender.BasicSender):
    # Main sending loop.
    def start(self):
        raise NotImplementedError

'''
This will be run if you run this script from the command line. You should not
change any of this; the grader may rely on the behavior here to test your
submission.
'''
if __name__ == "__main__":
    def usage():
        print "BEARS-TP Sender"
        print "-f FILE | --file=FILE The file to transfer; if empty reads from STDIN"
        print "-p PORT | --port=PORT The destination port, defaults to 33122"
        print "-a ADDRESS | --address=ADDRESS The receiver address or hostname, defaults to localhost"
        print "-d | --debug Print debug messages"
        print "-h | --help Print this usage message"

    try:
        opts, args = getopt.getopt(sys.argv[1:],
                               "f:p:a:d", ["file=", "port=", "address=", "debug="])
    except:
        usage()
        exit()

    port = 33122
    dest = "localhost"
    filename = None
    debug = False

    for o,a in opts:
        if o in ("-f", "--file="):
            filename = a
        elif o in ("-p", "--port="):
            port = int(a)
        elif o in ("-a", "--address="):
            dest = a
        elif o in ("-d", "--debug="):
            debug = True

    s = Sender(dest,port,filename,debug)
    try:
        s.start()
    except (KeyboardInterrupt, SystemExit):
        exit()