[rabbitmq-discuss] Is it error?

Wed Feb 6 20:12:02 GMT 2013

I have some manage CLI script which must show info about exchanges and
queues and must declare it if need. How i can take info about this wihout
web managment plugin?

2013/2/5 Alvaro Videla <videlalvaro at gmail.com>

> I don't know what you are trying to do, but the idea behind the "declare"
> methods is that you don't need to issue a "queue_declare" passive=true just
> to see if the queue is there, if not then create it with another
> queue_declare.
>
> "queue_declare" won't do anything if the queue already exists, so you
> shouldn't need to use it twice.
>
>
> On Tue, Feb 5, 2013 at 2:52 PM, Тимур <mcsseifer at gmail.com> wrote:
>
>> My client raise error on 404 error.
>> I use passive mode for detect exists queue or not. And if it not exists
>> then i try create it without passive. So, i realy cant do something like
>> that:
>>
>> connection->channel_close(1);
>> connecton->channel_open(1);
>>
>> because "Opening channel: server connection error 503, message:
>> COMMAND_INVALID - second 'channel.open'"
>>
>> Instead this i reopen connect to server, but its not good way.
>>
>>
>> 2013/2/5 Tim Watson <tim at rabbitmq.com>
>>
>>> On 4 Feb 2013, at 18:31, Тимур wrote:
>>>
>>> > I found strange behavior in some case. What i do:
>>> >
>>> > 1. Connect to server
>>> > 2. Open channel with name is '1'
>>>
>>> Channel's don't have *name* property, so I'm not sure what you're
>>> talking about here.
>>>
>>> > 3. Declare queue with passive = 1
>>> >
>>>
>>> Does the queue already exist, or are you trying to create it here?
>>>
>>> > And after that i try declare queue with passive = 0 if i receive 404
>>> error in third step. Receive error like 'Declare Exchange: Resource
>>> temporary unavailable'. Is it actual behavior?
>>>
>>>
>>> From
>>> http://www.rabbitmq.com/amqp-0-9-1-reference.html#queue.declare.passive
>>>
>>> "bit passive
>>>  If set, the server will reply with Declare-Ok if the queue already
>>> exists with the same name, and raise an error if not."
>>>
>>> So you would end up with a channel error if the queue doesn't already
>>> exit and will need to open a new channel. If that's the case, then it's
>>> likely the behaviour you're seeing is consistent but the client error is
>>> confusing. The 404 channel error means "The client attempted to work with a
>>> server entity that does not exist".
>>>
>>> Cheers,
>>> Tim
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>>> rabbitmq-discuss at lists.rabbitmq.com
>>> https://lists.rabbitmq.com/cgi-bin/mailman/listinfo/rabbitmq-discuss
>>>
>>
>>
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>
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