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

Matt Pietrek mpietrek at skytap.com
Thu Aug 23 17:04:31 BST 2012

Pinging again on this thread. Gavin?



On Fri, Aug 17, 2012 at 4:11 PM, Matt Pietrek <mpietrek at skytap.com> wrote:

> 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?
> Thanks,
> Matt
> 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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