Introduction to pika.exceptions.channelclosedbybroker

pika.exceptions.channelclosedbybroker is a Python exception that is raised when a channel is closed by the broker due to a precondition failure. This particular exception occurs when there is a mismatch between the durable argument of a queue in a vhost and its counterpart on the broker.

Error Message

The error message associated with pika.exceptions.channelclosedbybroker is:

(406,"precondition_failed - vhost 'fx' queue 'fx-naas' not equivalent arg 'durable': r') 

Possible Causes

There are a few possible reasons why this exception may be raised:

• The durable argument of the queue was set to False on the client side, but the broker expects it to be True.
• The durable argument of the queue was set to True on the client side, but the broker expects it to be False.
• The queue was deleted or purged on the broker side, and the client is attempting to use it without re-declaring it.

How to Resolve the Issue

To resolve this issue, you can try the following steps:

• Verify that the durable argument of the queue matches what is expected on the broker side.
• Re-declare the queue to ensure that its properties match what is expected on the broker side.
• Ensure that the queue hasn't been deleted or purged on the broker side.
• If the issue persists, double-check that the connection parameters, such as hostname and port, are correct.

Conclusion

In summary, pika.exceptions.channelclosedbybroker is an error that can occur when there's a mismatch between the properties of a queue in a vhost and its counterpart on the broker. By following the steps outlined above, you can resolve this issue and ensure that your code runs smoothly.