book

Twisted Network Programming Essentials, 2nd Edition

by Abe Fettig, Jessica McKellar

March 2013

Beginner

191 pages

4h 9m

English

O'Reilly Media, Inc.

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Why Use Twisted?What This Book CoversConventions Used in This BookWhat You’ll NeedChanges Since the Previous EditionUsing Code ExamplesSafari® Books OnlineHow to Contact UsAcknowledgments
Installing TwistedInstallation on LinuxMore package options and optional dependenciesInstallation on WindowsOptional dependenciesAdding Twisted utilities to your PATHInstallation on OS XOptional dependenciesInstalling from SourceRequired DependenciesInstalling a C compilerInstalling zope.interfaceInstalling Twisted from a Release TarballInstalling Twisted from a Source CheckoutInstalling Optional Dependencies from SourceTesting Your InstallationUsing the Twisted DocumentationAPI DocumentationSubproject DocumentationFinding Answers to Your QuestionsMailing ListsIRC ChannelsStack OverflowTwisted Blogs
A TCP Echo Server and ClientEvent-Driven ProgrammingThe ReactorTransportsProtocolsProtocol FactoriesDecoupling Transports and ProtocolsA TCP Quote Server and ClientProtocol State MachinesMore Practice and Next Steps
What Deferreds Do and Don’t DoThe Structure of a Deferred ObjectCallback Chains and Using Deferreds in the ReactorPractice: What Do These Deferred Chains Do?Exercise 1Exercise 2Exercise 3Exercise 4Exercise 5Exercise 6The Truth About addCallbacksExercise 7Exercise 8Key Facts About DeferredsSummary of the Deferred APIMore Practice and Next Steps
Responding to HTTP Requests: A Low-Level ReviewThe Structure of an HTTP RequestParsing HTTP RequestsHandling GET RequestsServing Static ContentStatic URL dispatchServing Dynamic ContentDynamic DispatchCreating resources that are both renderable and have childrenRedirectsHandling POST RequestsA Minimal POST ExampleAsynchronous ResponsesMore Practice and Next Steps
Basic HTTP Resource RetrievalPrinting a Web ResourceDownloading a Web ResourceAgentRequesting Resources with AgentRetrieving Response MetadataPOSTing Data with AgentMore Practice and Next Steps
The Twisted Application InfrastructureServicesApplicationsTAC FilestwistdPluginsMore twistd ExamplesMore Practice and Next StepsSuggested Exercises

Basic In-Application Loggingtwistd LoggingCustom LoggersKey Facts and Caveats About Logging
Nonblocking Database QueriesMore Practice and Next Steps
The Components of Twisted CredTwisted Cred: An ExampleCredentials CheckersAuthentication in Twisted ApplicationsMore Practice and Next Steps
ThreadsSubprocessesRunning a Subprocess and Getting the ResultCustom Process ProtocolsMore Practice and Next Steps
Writing and Running Twisted Unit Tests with TrialTesting ProtocolsTests and the ReactorTesting DeferredsTesting the Passage of TimeMore Practice and Next Steps
IRC ClientsIRC ServersMore Practice and Next Steps
SMTP Clients and ServersThe SMTP ProtocolSending Emails Using SMTPSMTP ServersStoring MailIMAP Clients and ServersIMAP ServersIMAP ClientsPOP3 Clients and ServersPOP3 ServersMore Practice and Next Steps
SSH ServersA Basic SSH ServerUsing Public Keys for AuthenticationProviding an Administrative Python ShellRunning Commands on a Remote ServerSSH ClientsMore Practice and Next Steps
Contributing to Twisted

Content preview from Twisted Network Programming Essentials, 2nd Edition

Chapter 1. Getting Started

Before you can start developing applications using Twisted, you’ll need to download and install Twisted and its dependencies. This chapter walks you through the installation process on various operating systems. It also shows you how to add the Twisted utilities to your path, familiarize yourself with the Twisted documentation, and get answers to your questions from the Twisted community.

These instructions assume that you are familiar with Python and, in the case of source installations, comfortable navigating and installing packages from the command line.

Twisted requires Python 2.6 or 2.7. Support for Python 3.0 is in progress at the time of this writing.

Installing Twisted

First things first: you need to get Twisted installed on your computer. Downloads and instructions for installing Twisted on various operating systems can be found on the Twisted home page, with additional instructions and links to older releases at this Twisted page. To enable additional functionality in Twisted, you’ll have to install a couple of optional packages as well.

You can find everything you need on the Twisted website, but if you’d like you can also browse this page on PyPI for the source, Windows installers, and download statistics.

Installation on Linux

All of the popular Linux distributions maintain a python-twisted package as well as packaged versions of Twisted’s dependencies. To install Twisted on a dpkg-based system, run: