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  • Learning Python Networking
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Learning Python Networking

Learning Python Networking

By : Dr. M. O. Faruque Sarker, Samuel B Washington, Sam Washington
3.7 (7)
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Learning Python Networking

Learning Python Networking

3.7 (7)
By: Dr. M. O. Faruque Sarker, Samuel B Washington, Sam Washington

Overview of this book

If you're a Python developer or a system administrator with Python experience and you're looking to take your first steps in network programming, then this book is for you. Basic knowledge of Python is assumed.
Table of Contents (12 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Network Programming and Python
1. Network Programming and Python
An introduction to TCP/IP networks
Network programming with Python
Breaking a few eggs
Summary
2
2. HTTP and Working with the Web
2. HTTP and Working with the Web
Request and response
Requests with urllib
Response objects
Status codes
Handling problems
HTTP headers
Customizing requests
Content negotiation
User agents
Cookies
Redirects
URLs
HTTP methods
Formal inspection
HTTPS
The Requests library
Summary
3
3. APIs in Action
3. APIs in Action
Getting started with XML
The Amazon S3 API
JSON
The Twitter API
HTML and screen scraping
With great power...
Summary
4
4. Engaging with E-mails
4. Engaging with E-mails
E-mail terminologies
Sending e-mails with SMTP
Sending e-mails securely with TLS
Retrieving e-mails by using POP3 with poplib
Retrieving e-mails by using IMAP with imaplib
Sending e-mail attachments
Sending e-mails via the logging module
Summary
5
5. Interacting with Remote Systems
5. Interacting with Remote Systems
Secure shell – access using Python
Transferring files through SFTP
Transferring files with FTP
Fetching Simple Network Management Protocol data
Reading Light-weight Directory Access Protocol data
Sharing files with SAMBA
Summary
6
6. IP and DNS
6. IP and DNS
Retrieving the network configuration of a local machine
Manipulating IP addresses
GeoIP look-ups
NTP clients
Summary
7
7. Programming with Sockets
7. Programming with Sockets
Basics of sockets
Working with TCP sockets
Working with UDP sockets
TCP port forwarding
A non-blocking socket I/O
Securing sockets with TLS/SSL
Creating a custom SSL client/server
Summary
8
8. Client and Server Applications
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8. Client and Server Applications
Client and server
An echo protocol
A simple echo server
A simple echo client
Concurrent I/O
Multithreading and multiprocessing
A multithreaded echo server
Designing a chat server
A chat protocol
Handling data on persistent connections
A multithreaded chat server
A multithreaded chat client
Event-driven servers
A low-level event-driven chat server
Frameworks
An eventlet-based chat server
An asyncio-based chat server
More on frameworks
Taking our servers forward
Summary
9
9. Applications for the Web
9. Applications for the Web
What's in a web server?
Python and the Web
Flask – a microframework
Hosting Python web applications
Hosting in practice
Summary
10
A. Working with Wireshark
A. Working with Wireshark
Packet sniffers
Wireshark
11
Index
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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