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Crochet: Use Twisted Anywhere!

Crochet is an MIT-licensed library that makes it easier for blocking or threaded applications like Flask or Django to use the Twisted networking framework. Crochet provides the following features:

  • Runs Twisted's reactor in a thread it manages.
  • The reactor shuts down automatically when the process' main thread finishes.
  • Hooks up Twisted's log system to the Python standard library logging framework. Unlike Twisted's built-in logging bridge, this includes support for blocking Handler instances.
  • A blocking API to eventual results (i.e. Deferred instances). This last feature can be used separately, so Crochet is also useful for normal Twisted applications that use threads.
Build Status

Documentation can be found on Read The Docs.

Bugs and feature requests should be filed at the project Github page.

Changelog

0.9.0

New features:

  • Expanded and much improved documentation, including a new section with design suggestions.
  • New decorator @wait_for_reactor added, a simpler alternative to @run_in_reactor.
  • Refactored @run_in_reactor, making it a bit more responsive.
  • Blocking operations which would otherwise never finish due to reactor having stopped (EventualResult.wait() or @wait_for_reactor decorated call) will be interrupted with a ReactorStopped exception.

Bug fixes:

  • @run_in_reactor decorated functions (or rather, their generated wrapper) are interrupted by Ctrl-C.
  • On POSIX platforms, a workaround is installed to ensure processes started by reactor.spawnProcess have their exit noticed. See Twisted ticket 6378 for more details about the underlying issue.

0.8.1

  • EventualResult.wait() now raises error if called in the reactor thread.
  • Unittests are now included in the release tarball.
  • Allow Ctrl-C to interrupt EventualResult.wait(timeout=None).

0.7.0

  • Improved documentation.

0.6.0

  • Renamed DeferredResult to EventualResult, to reduce confusion with Twisted's Deferred class. The old name still works, but is deprecated.
  • Deprecated @in_reactor, replaced with @run_in_reactor which doesn't change the arguments to the wrapped function. The deprecated API still works, however.
  • Unhandled exceptions in EventualResult objects are logged.
  • Added more examples.
  • setup.py sdist should work now.

0.5.0

  • Initial release.