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Learning Python Networking

You're reading from   Learning Python Networking Utilize Python 3 to get network applications up and running quickly and easily

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Product type Paperback
Published in Jun 2015
Publisher
ISBN-13 9781784396008
Length 320 pages
Edition 1st Edition
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Toc

Table of Contents (12) Chapters Close

Preface 1. Network Programming and Python 2. HTTP and Working with the Web FREE CHAPTER 3. APIs in Action 4. Engaging with E-mails 5. Interacting with Remote Systems 6. IP and DNS 7. Programming with Sockets 8. Client and Server Applications 9. Applications for the Web A. Working with Wireshark Index

A multithreaded echo server


A benefit of the multithreading approach is that the OS handles the thread switches for us, which means we can continue to write our program in a procedural style. Hence we only need to make small adjustments to our server program to make it multithreaded, and thus, capable of handling multiple clients simultaneously.

Create a new file called 1.3-echo_server-multi.py and add the following code to it:

import threading
import tincanchat

HOST = tincanchat.HOST
PORT = tincanchat.PORT

def handle_client(sock, addr):
    """ Receive one message and echo it back to client, then close
        socket """
    try:
        msg = tincanchat.recv_msg(sock)  # blocks until received
                                         # complete message
        msg = '{}: {}'.format(addr, msg)
        print(msg)
        tincanchat.send_msg(sock, msg)  # blocks until sent
    except (ConnectionError, BrokenPipeError):
        print('Socket error')
    finally:
        print('Closed connection...
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