Does message confirmation work? (Rabbit backend)

I see there’s a commit referenced in #193 and some stuff in the docs.

I have set up an errback function and am using ensure, have also tried the extra transport options given here: http://stackoverflow.com/a/21016469/202168

publish appears to send a message to my broker: I see a blip in the ‘Return’ graph of my test exchange (Rabbit web UI) but nothing goes through to the queue.

I guess I have something configured wrong, it sounds to me like a ‘Return’ means the message has bounced. My errback does not get called though.

I also noticed that here in publish method it says the mandatory and immediate args are “currently not supported”. I tried using them and immediate gives a “AMQPNotImplementedError” but mandatory does not.

At the moment I’m not sure a) if the kombu message confirm/retry/errback stuff works or b) how to debug my publishing problem.

I was also wondering about the on_return arg for a Producer (“Callback to call for undeliverable messages”)… it sounds like what I need. It says “Note that the producer needs to drain events to use this feature”… I’m not clear exactly how this relates to the producer.

There’s a drain_events method on the connection… I tried:

publish = conn.ensure(producer, producer.publish,
                      errback=_errback, max_retries=3)

publish(message, **kwargs)
print conn.drain_events(timeout=5)

The drain times-out though… am I doing it wrong? or no return/error means no events to drain, i.e. message succeeded?

[ask]

Btw, “confirms” usually refer to publisher confirmations, which is not related to the mandatory flag.

To use publisher confirms you need to use pyamqp (not librabbitmq), and set the confirm_publish transport option: Connection(transport_options={'confirm_publish': True}), or if using Celery: BROKER_TRANSPORT_OPTIONS = {'confirm_publish': True}.

[zbentley]

UPD1: confirms are not shown in Rabbit Management Console.

They are shown, at least in RabbitMQ 3.6+; if you open a connection object you can see a “mode” setting of C for connections with confirms enabled.