[rabbitmq-discuss] Publishing binary messages using ruby amqp gem

paneer_tikka neerajapte at gmail.com
Sun Oct 24 15:40:47 BST 2010

To answer my own question -

All I had to do was to change:
q.subscribe {|message| puts "got it!\n#{message}"}

q.subscribe {|header, message| puts "got it!\n#{message}"}

Unfortunately I couldn't readily find it in the documentation of the
Hopefully it will save someone some time!

- Neeraj

On Oct 24, 1:02 pm, paneer_tikka <neeraja... at gmail.com> wrote:
> Hi,
>   Has anyone published binary messages (where payload is binary) to
> RabbitMQ using amqp gem? I am a newbie when it comes to RabbitMQ/AMQP.
> I am able to publish text files and json messages fine. Having read
> that RabbitMQ message is a pure binary message, I thought publishing
> binary payload would be as simple as passing the bytes of the message
> to the "publish" call.
> When I try to publish a binary message, it seems that the queue simply
> “hangs”. Any further messages on the queue, even text messages, seem
> to get “stuck”. Here’s a simple test code you can run from irb. If I
> run it as it is, the client gets the 'blabla' text message fine. Now
> if I change the publisher to publish the contents (uncomment the line
> q.publish(contents)), the queue seems to hang from there on. Any
> subsequent text messages also seem to be lost.
> I am hoping that I’m missing something obvious here, like a
> configuration param to the queue or an optional arg to the publish
> method, but I haven’t been able to figure it out. Spent several hours
> fighting with this yesterday. Can anyone help please?
> --- publisher---
> require ‘mq’
> AMQP.start(:host => '') do
>  q = MQ.queue('test_bin_q')
>  contents = open('C:/Temp/guid.zip', "rb") {|io| io.read }
>  #q.publish(contents)
>  q.publish(‘blabla’)
>  puts 'done publishing'
> end
> ----------------
> --- subscriber---
> AMQP.start(:host => '') do
>  q = MQ.queue('test_bin_q1')
>  q.subscribe {|message| puts "got it!\n#{message}"}
> end
> ----------------
> Neeraj
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