[rabbitmq-discuss] Pika: Error when doing a stop_consuming() from a timeout callback

Fri Jul 29 00:05:44 BST 2011

I'll take a look shortly, mind opening a issue on github for me to track with? 

On Thursday, July 28, 2011 at 7:04 PM, Christian Haintz wrote:

> On 29/7/11 24:54, Gavin M. Roy wrote:
> > 
> > On Thursday, July 28, 2011 at 6:45 PM, Christian Haintz wrote:
> > 
> > > Hi,
> > > 
> > > I want to stop the consuming loop of a BlockingConnection after some
> > > timeout. I used the following code. Producer is not running because I
> > > want to simulate the timeout. Current pika version is used from github.
> > I'd not consider the master branch on Pika stable, which is one of the
> > reasons I've not tagged 0.9.6. I'd do a pip install of 0.9.5 and see if
> > that solves your problem.
> > 
> > Gavin
> 
> I tried it first with 0.9.5 but that leads to a different error which 
> seams to be fixed in the master branch (used the same test code as in 
> the previous e-mail):
> 
> --------8<--------- snip ----------8<-----------
> python pika_test.py
> Traceback (most recent call last):
>  File "pika_test.py", line 21, in <module>
>  channel.start_consuming()
>  File 
> "build/bdist.macosx-10.6-universal/egg/pika/adapters/blocking_connection.py", 
> line 293, in start_consuming
>  File 
> "build/bdist.macosx-10.6-universal/egg/pika/adapters/blocking_connection.py", 
> line 103, in process_data_events
>  File 
> "build/bdist.macosx-10.6-universal/egg/pika/adapters/blocking_connection.py", 
> line 157, in process_timeouts
> NameError: global name 'log' is not defined
> --------8<------- snip end --------8<-----------
> 
> Best Regards,
> Christian
> 
> 
> > > 
> > > --------8<--------- snip ----------8<-----------
> > > import pika
> > > connection = pika.BlockingConnection(pika.ConnectionParameters(
> > > host='localhost'))
> > > 
> > > channel = connection.channel()
> > > 
> > > result = channel.queue_declare(exclusive=True)
> > > callback_queue = result.method.queue
> > > 
> > > def on_response(self, ch, method, props, body):
> > > #do some processing
> > > channel.stop_consuming()
> > > 
> > > # normaly i do some publish here but that's not relevant
> > > # to reproduce the error
> > > 
> > > channel.basic_consume(on_response, no_ack=True,
> > > queue=callback_queue)
> > > 
> > > def panic():
> > > channel.stop_consuming()
> > > 
> > > connection.add_timeout(1, panic)
> > > channel.start_consuming()
> > > 
> > > --------8<------- snip end --------8<-----------
> > > 
> > > But I get the following error:
> > > 
> > > --------8<--------- snip ----------8<-----------
> > > $ python pika_test.py
> > > /Users/christian/devel/pika/pika/callback.py:69: UserWarning:
> > > CallbackManager.add: Duplicate callback found for "1:Basic.CancelOk"
> > > (self.__class__.__name__, prefix, key))
> > > Traceback (most recent call last):
> > > File "pika_test.py", line 21, in <module>
> > > channel.start_consuming()
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 307, in start_consuming
> > > self.transport.connection.process_data_events()
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 104, in process_data_events
> > > self.process_timeouts()
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 164, in process_timeouts
> > > self._timeouts[timeout_id]['handler']()
> > > File "pika_test.py", line 18, in panic
> > > channel.stop_consuming()
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 318, in stop_consuming
> > > self.basic_cancel(consumer_tag)
> > > File "/Users/christian/devel/pika/pika/channel.py", line 333, in
> > > basic_cancel
> > > self._on_cancel_ok, [spec.Basic.CancelOk])
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 220, in rpc
> > > self.send_method(method, None, wait)
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 249, in send_method
> > > self.connection.process_data_events()
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 104, in process_data_events
> > > self.process_timeouts()
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 164, in process_timeouts
> > > self._timeouts[timeout_id]['handler']()
> > > File "pika_test.py", line 18, in panic
> > > channel.stop_consuming()
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 318, in stop_consuming
> > > self.basic_cancel(consumer_tag)
> > > File "/Users/christian/devel/pika/pika/channel.py", line 333, in
> > > basic_cancel
> > > self._on_cancel_ok, [spec.Basic.CancelOk])
> > > File
> > > "/Users/christian/devel/pika/pika/adapters/blocking_connection.py", line
> > > 209, in rpc
> > > self._on_rpc_complete)
> > > TypeError: 'NoneType' object is not iterable
> > > 
> > > 
> > > What I am doing wrong? Are the timeout callbacks not capable of stopping
> > > the consumer?
> > > 
> > > 
> > > Regards,
> > > Christian
> > > _______________________________________________
> > > rabbitmq-discuss mailing list
> > > rabbitmq-discuss at lists.rabbitmq.com (mailto:rabbitmq-discuss at lists.rabbitmq.com)
> > > <mailto:rabbitmq-discuss at lists.rabbitmq.com>
> > > https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss

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