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Use Twisted from threaded applications

Project description

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.



Bug fixes:

  • EventualResult.wait() can now be used safely from multiple threads, thanks to Gavin Panella for reporting the bug.

  • Fixed reentrancy deadlock in the logging code caused by, thanks to Rod Morehead for reporting the bug.

  • Crochet now installs on Python 3.3 again, thanks to Ben Cordero.

  • Crochet should now work on Windows, thanks to Konstantinos Koukopoulos.

  • Crochet tests can now run without adding its absolute path to PYTHONPATH or installing it first.


  • EventualResult.original_failure is now documented.



  • Added section on use cases and alternatives. Thanks to Tobias Oberstein for the suggestion.

Bug fixes:

  • Twisted does not have to be pre-installed to run, thanks to Paul Weaver for bug report and Chris Scutcher for patch.

  • Importing Crochet does not have side-effects (installing reactor event) any more.

  • Blocking calls are interrupted earlier in the shutdown process, to reduce scope for deadlocks. Thanks to rmorehead for bug report.


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. Thanks to rmorehead for the bug report.

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.


  • EventualResult.wait() now raises error if called in the reactor thread, thanks to David Buchmann.

  • Unittests are now included in the release tarball.

  • Allow Ctrl-C to interrupt EventualResult.wait(timeout=None).


  • Improved documentation.


  • 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.

  • sdist should work now.


  • Initial release.

Project details

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