[rabbitmq-discuss] erlang 1.6.0 client possible problem

Thu Apr 22 19:43:14 BST 2010

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Matthew,

Followup question. Will the 1.7.x erlang client work with 1.6.0 brokers.?

I have also tried to use the erlang client tagged with the broker
version number.

Mark.

On 04/22/2010 10:58 AM, Matthew Sackman wrote:
> Hi Mark,
>
> Needless to say, 1.6.0 is pretty ancient and we'd recommend that
> you upgrade to the latest 1.7.2, where lib_amqp has vanished, and
> the problem you're reporting has been abstracted away by the
> library.
>
> On Thu, Apr 22, 2010 at 10:36:07AM -0600, Mark Geib wrote:
>> case lib_amqp:get(Channel, Queue, false) of basic.get_emtpy ->
>> ...
>>
>> {DeliveryTag, Content} -> #content{payload_fragments_rev =
>> Payload, class_id = ClassId, properties_bin = Props} = Content,
>> Message = list_to_binary(Payload),
>
> The clue is in the name ;) payload_fragments_rev is a *reversed*
> list of fragments. Thus you'll need to reverse it first. The reason
> this only affects you with large messages is that smaller messages
> will be under the max frame size, and thus will only be a single
> fragment.
>
> Just ftr, if you do upgrade to 1.7.2, the API is now:
>
> {#'basic.get_ok'{}, #amqp_msg{payload = Payload}} =
> amqp_channel:call(Channel, #'basic.get'{queue = Q, no_ack =
> false}),
>
> There, Payload is a single binary, not reversed, and not a list,
> thus all the work has been done for you.
>
> Best wishes,
>
> Matthew

- -- 
Principal Engineer
Cheyenne Software Engineering
mark.geib at echostar.com / 35-215

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