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

paneer_tikka neerajapte at gmail.com
Sun Oct 24 09:02:37 BST 2010

  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 }
 puts 'done publishing'

--- subscriber---
AMQP.start(:host => '') do
 q = MQ.queue('test_bin_q1')
 q.subscribe {|message| puts "got it!\n#{message}"}


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