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Foundations of Python Network Programming

:	Brandon Rhodes, John Goerzen
:	Foundations of Python Network Programming
:	Apress
:	9781430258551
:	3
:	CHF 59.50
:

:	Allgemeines, Lexika
:	English

:	369
:	Wasserzeichen/DRM
:	PC/MAC/eReader/Tablet
:	PDF

Foundat ons of Python Network Programming,Third Edition, covers all of the classic topics found in the second edition of this book, including network protocols, network data and errors, email, server architecture, and HTTP and web applications, plus updates for Python 3.

Some of the new topics in this edition include:

• Extensive coverage of the updated SSL support in Python 3

• How to write your own asynchronous I/O loop.

• An overview of the 'asyncio' framework that comes with Python 3.4.

• How the Flask web framework connects URLs to your Python code.

• How cross-site scripting and cross-site request forgery can be used to attack your web site, and how to protect against them.

• How a full-stack web framework like Django can automate the round trip from your database to the screen and back.

If you're a Python programmer who needs a deep understanding of how to use Python for network-related tasks and applications, this is the book for you. From web application developers, to systems integrators, to system administrators—this book has everything that you need to know.

Brandon Rhodes is a consulting programmer who also teaches the Python language professionally for organizations that are adding the language to their tool set. He has spoken at PyOhio; at PyGotham; at national PyCon conferences in Canada, Ireland, and Poland; and at Django conferences in Portland, Wales, and Warsaw, where he was delighted at the creativity of the organizers, who rented a circus tent for the occasion. He will chair the flagship PyCon North America conference in Portland in 2016–2017. Brandon is interested in how ideas like the Clean Architecture can help programmers organize code more effectively and in what we can learn from writers in other fields about offering kind and actionable critiques of each other’s work. He currently lives in tiny Bluffton, Ohio, with his wife Jackie and their two cats.

	Contents at a Glance	3
	Contents	358
	About the Author	367
	About the Technical Reviewers	368
	Acknowledgments	369
	Introduction	5
	Chapter 1: Introduction to Client-Server Networking	9
	The Building Blocks: Stacks and Libraries	9
	Application Layers	12
	Speaking a Protocol	13
	A Raw Network Conversation	14
	Turtles All the Way Down	17
	Encoding and Decoding	18
	The Internet Protocol	19
	IP Addresses	20
	Routing	21
	Packet Fragmentation	22
	Learning More About IP	23
	Summary	24
	Chapter 2: UDP	25
	Port Numbers	26
	Sockets	27
	Promiscuous Clients and Unwelcome Replies	31
	Unreliability, Backoff, Blocking, and Timeouts	32
	Connecting UDP Sockets	36
	Request IDs: A Good Idea	37
	Binding to Interfaces	38
	UDP Fragmentation	40
	Socket Options	41
	Broadcast	42
	When to Use UDP	44
	Summary	44
	Chapter 3: TCP	46
	How TCP Works	46
	When to Use TCP	47
	What TCP Sockets Mean	48
	A Simple TCP Client and Server	49
	One Socket per Conversation	52
	Address Already in Use	53
	Binding to Interfaces	54
	Deadlock	55
	Closed Connections, Half-Open Connections	60
	Using TCP Streams Like Files	61
	Summary	61
	Chapter 4: Socket Names and DNS	63
	Hostnames and Sockets	63
	Five Socket Coordinates	64
	IPv6	65
	Modern Address Resolution	66
	Using getaddrinfo() to Bind Your Server to a Port	67
	Using getaddrinfo() to Connect to a Service	68
	Asking getaddrinfo() for a Canonical Hostname	69
	Other getaddrinfo() Flags	70
	Primitive Name Service Routines	71
	Using getsockaddr() in Your Own Code	71
	The DNS Protocol	73
	Why Not to Use Raw DNS	75
	Making a DNS Query from Python	75
	Resolving Mail Domains	77
	Summary	79
	Chapter 5: Network Data and Network Errors	80
	Bytes and Strings	80
	Character Strings	81
	Binary Numbers and Network Byte Order	84
	Framing and Quoting	86
	Pickles and Self-delimiting Formats	91
	XML and JSON	91
	Compression	92
	Network Exceptions	93
	Raising More Specific Exceptions	95
	Catching and Reporting Network Exceptions	96
	Summary	97
	Chapter 6: TLS/SSL	98
	What TLS Fails to Protect	98
	What Could Possibly Go Wrong?	99
	Generating Certificates	100
	Offloading TLS	103
	Python 3.4 Default Contexts	104
	Variations on Socket Wrapping	108
	Hand-Picked Ciphers and Perfect Forward Security	109
	Protocol Support for TLS	111
	Learning Details	112
	Summary	118
	Chapter 7: Server Architecture	119
	A Few Words About Deployment	119
	A Simple Protocol	121
	A Single-Threaded Server	124
	Threaded and Multiprocess Servers	127
	The Legacy SocketServer Framework	128
	Async Servers	129
	Callback-Style asyncio	132
	Coroutine-Style asyncio	134
	The Legacy Module asyncore	135
	The Best of Both Worlds	137
	Running Under inetd	137
	Summary	139
	Chapter 8: Caches and Message Queues	140
	Using Memcached	140
	Hashing and Sharding	143
	Message Queues	145
	Using Message Queues from Python	147
	Summary	151
	Chapter 9: HTTP Clients	153
	Python Client Libraries	153
	Ports, Encryption, and Framing	155
	Methods	156
	Paths and Hosts	157
	Status Codes	158
	Caching and Validation	160
	Content Encoding	163
	Content Negotiation	163
	Content Type	165
	HTTP Authentication	165
	Cookies	167
	Connections, Keep-Alive, and httplib	168
	Summary	169
	Chapter 10: HTTP Servers	170
	WSGI	170
	Asynchronous Server- Frameworks	172
	Forward and Reverse Proxies	172
	Four Architectures	173
	Running Python Under Apache	175
	The Rise of Pure-Python HTTP Servers	175
	The Benefits of Reverse Proxies	175
	Platforms as a Service	176
	GET and POST Patterns and the Question of REST	177
	WSGI Without a Framework	179
	Summary	183
	Chapter 11: The World Wide Web	184
	Hypermedia and URLs	184
	Parsing and Building URLs	185
	Relative URLs	187
	The Hypertext Markup Language	189
	Reading and Writing to a Database	192
	A Terrible Web Application (in Flask)	193
	The Dance of Forms and HTTP Methods	198