echo_client.py

import socket
import sys




def client(msg, log_buffer=sys.stderr):

    server_address = ('localhost', 10000)

    # TODO: Replace the following line with your code which will instantiate

    #       a TCP socket with IPv4 Addressing, call the socket you make 'sock'

    sock = socket.socket(

        socket.AF_INET,

        socket.SOCK_STREAM,

        socket.IPPROTO_IP)

    print('connecting to {0} port {1}'.format(*server_address), file=log_buffer)

    # TODO: connect your socket to the server here.

    sock.connect(server_address)

    # you can use this variable to accumulate the entire message received back

    # from the server

    received_message = b''



    # this try/finally block exists purely to allow us to close the socket

    # when we are finished with it

    try:

        print('sending "{0}"'.format(msg), file=log_buffer)

        # TODO: send your message to the server here.

        sock.sendall(msg.encode('utf8'))

        # TODO: the server should be sending you back your message as a series

        #       of 16-byte chunks. Accumulate the chunks you get to build the

        #       entire reply from the server. Make sure that you have received

        #       the entire message and then you can break the loop.

        #

        #       Log each chunk you receive.  Use the print statement below to

        #       do it. This will help in debugging problems

        buffsize = 16

        #chunk = ''

        done = False

        while not done:

            msg_part = sock.recv(buffsize)

            if len(msg_part) < buffsize:

                done = True

                sock.close()

            received_message += msg_part

        print('received "{0}"'.format(received_message.decode('utf8')), file=log_buffer)

    finally:

        # TODO: after you break out of the loop receiving echoed chunks from

        #       the server you will want to close your client socket.

        print('closing socket', file=log_buffer)

        sock.close()

        # TODO: when all is said and done, you should return the entire reply

        # you received from the server as the return value of this function.

        return received_message.decode('utf8')





if __name__ == '__main__':

    if len(sys.argv) != 2:

        usage = '\nusage: python echo_client.py "this is my message"\n'

        print(usage, file=sys.stderr)

        sys.exit(1)



    msg = sys.argv[1]

    client(msg)