[rabbitmq-discuss] anyone using Twisted?
esteve at sindominio.net
Thu Sep 11 15:25:32 BST 2008
sorry for chimming in so late, I just came back from holidays.
On Thu, Aug 21, 2008 at 7:10 PM, Paul C. Nendick <paul.nendick at ...> wrote:
> Some observations about txamqp:
> * it's very alpha and clearly incomplete
Although I'm not sure if I would label it production-ready, I'd definetely say
it's beta quality code and fairly complete. What features would you like to
see? The testsuite already covers extensively both 0.8 and 0.9 specs, so I
don't know what else can be added. We'll adapt it to Qpid M3, once it's
> * it's fundamentally misunderstood the way AMQP routes of messages
> over separate channels. Deferred calls often don't fire since txamqp
> is waiting for the response on the wrong channel. Oops!
Can you provide a testcase for this? I cannot reproduce the bug. Find attached
an example that creates 5 channels and 5 different consumers, messages are
sent and received to/from the right channel. The example works with Qpid M2
and Rabbit 1.4.0, but not with OpenAMQ (as it doesn't implement multiple
> * txamqp is multi-threaded. Tsk tsk, this is a no-no for twisted
> protocol handlers
Nope, it's not multi-threaded, please take a look at the code. We use Qpid for
autogenerating the AMQP classes and methods, but not for reading/writing from
sockets or for queueing messages (we use DeferredQueues instead).
> * the txamqp unit tests are very good and quite easy to adapt to be
> made asynchronous
Thanks, but all credit goes to the Qpid crew, we simply adapted the testsuite
to use Deferreds. However, it's already asynchronous, notice that it uses the
inlineCallbacks idiom, which makes code look as if it was sequential without
blocking the reactor.
> We've resolved these and other issues. In the end, it will help me
> open source the code to know the level of your interest in it. I'll
> announce any news on this list.
Since txAMQP does not use threads and channels do work, I hope you reconsider
your opinion about txAMQP. Anyway, what actual issues did you find? The
Launchpad project page  includes a bug section  and we would be glad to
hear about what could be improved. If you want to contribute some code, I'll
happily add you to the txAMQP team.
1 - https://launchpad.net/txamqp
2 - https://bugs.launchpad.net/txamqp
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