[rabbitmq-discuss] Using Pika's add_on_return_callback with a BlockingConnection?

Matt Pietrek mpietrek at skytap.com
Sat Aug 18 00:11:20 BST 2012

Update on this: I came across the BlockingConnection.process_data_events()
method, which seems to do the trick if I insert it into my loop.

However, it doesn't look like an "official" API, in that I don't see it
described anywhere, and the only search results I get for it are its
inclusions in various callstacks.

Gavin (or whomever else wants to comment): What are your thoughts on this?



On Fri, Aug 17, 2012 at 3:52 PM, Matt Pietrek <mpietrek at skytap.com> wrote:

> I'm got a scenario where I use a dedicated thread to write a series of
> messages in a loop. This thread uses BlockingConnection, calls
> add_on_return_callback for its channel, and when publishing, uses the
> mandatory=True flag.
> I want to know when a message is being returned. However, I can't figure
> out what to call within my loop to give Pika the opportunity to see the
> Basic.Return message and invoke the callback.
> I've verified via WireShark that the Basic.Returns are coming back from
> the broker. However, I can't figure out what the moral equivalent of
> calling ioloop.start() is, so as to give Pika the an opportunity to process
> the basic.return messages, but without blocking indefinitely. Just for
> kicks I tried calling Channel.basic_get() within the loop, and (as
> expected), I didn't get the returned message callbacks.
> Thanks,
> Matt
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