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# Developer Guides

- Introduction

  - Executive summary

    Connecting your software - and having fun too!

- Getting Started

  - Writing a TCP server

    Basic network servers with Twisted.

  - Writing a TCP client

    And basic clients.

  - Test-driven development with Twisted

    Code without tests is broken by definition; Twisted makes it easy to test your network code.

  - Tutorial: Twisted From Scratch

    1. The Evolution of Finger: building a simple finger service
    2. The Evolution of Finger: adding features to the finger service
    3. The Evolution of Finger: cleaning up the finger code
    4. The Evolution of Finger: moving to a component based architecture
    5. The Evolution of Finger: pluggable backends
    6. The Evolution of Finger: a clean web frontend
    7. The Evolution of Finger: Twisted client support using Perspective Broker
    8. The Evolution of Finger: using a single factory for multiple protocols
    9. The Evolution of Finger: a Twisted finger client
    10. The Evolution of Finger: making a finger library
    11. The Evolution of Finger: configuration and packaging of the finger service

  - Setting up the TwistedQuotes application

  - Designing a Twisted application

- Networking and Other Event Sources

  - Twisted Internet

    A brief overview of the `twisted.internet` package.

  - Reactor basics

    The event loop at the core of your program.

  - Using SSL in Twisted

    Add some security to your network transport.

  - UDP Networking How to use Twisted’s UDP implementation, including multicast and broadcast functionality.

  - Using processes

    Launching sub-processes, the correct way.

  - Introduction to Deferreds

    Like callback functions, only a lot better.

  - Deferred reference

    In-depth information on Deferreds.

  - Generating deferreds

    More about Deferreds.

  - Scheduling

    Timeouts, repeated events, and more: when you want things to happen later.

  - Using threads

    Running code in threads, and interacting with Twisted in a thread-safe manner.

  - Producers and Consumers: Efficient High-Volume Streaming

    How to pause when buffers fill up.

  - Choosing a reactor and GUI toolkit integration

    GTK+, Windows, epoll() and more: use your GUI of choice, or a faster event loop.

- High-Level Infrastructure

  - Getting Connected with Endpoints

    Create configurable applications that support multiple transports (e.g. TCP and SSL).

  - Interfaces and Adapters (Component Architecture)

    When inheritance isn’t enough.

  - Cred: Pluggable Authentication Implementing authentication and authorization that is configurable, pluggable and re-usable.

  - Twisted’s plugin architecture

    A generic plugin system for extendable programs.

- Deploying Twisted Applications

  - Helper programs and scripts (twistd, ..)

    `twistd` lets you daemonize and run your application.

  - Using the Twisted Application Framework

    Writing code that `twistd` can run.

  - Writing Twisted Application Plugins for twistd

    More powerful `twistd` deployment method.

  - Deploying Twisted with systemd Use `systemd` to launch and monitor Twisted applications

- Utilities

  - Logging

    Keep a record of what your application is up to.

  - Symbolic constants

    enum-like constants.

  - Twisted RDBMS support with adbapi

    Using SQL with your relational database via DB-API adapters.

  - Parsing command-line arguments

    The command-line argument parsing used by `twistd` .

  - Using Dirdbm: Directory-based Storage

    A simplistic way to store data on your filesystem.

  - Tips for writing tests for Twisted code using Trial

    More information on writing tests.

  - Extremely Low-Level Socket Operations

    Using wrappers for sendmsg(2) and recvmsg(2).

- Asynchronous Messaging Protocol (AMP)

  - Asynchronous Messaging Protocol Overview

    A two-way asynchronous message passing protocol, for when HTTP isn’t good enough.

- Perspective Broker

  - Twisted Spread

    A remote method invocation (RMI) protocol: call methods on remote objects.

  - Introduction to Perspective Broker

  - Using Perspective Broker

  - Managing Clients of Perspectives

  - Passing Complex Types

  - Authentication with Perspective Broker

  - PB Limits

- Positioning

  - Twisted Positioning

- Appendix

  - Porting to Python 3
  - Glossary
  - Tips for debugging with emacs