[rabbitmq-discuss] RabbitMQ Consumer Error

Lynton Grice lynton.grice at logosworld.com
Sun Jul 12 18:13:19 BST 2009

Hi there,


I wonder if someone can help me on this one. I am building the following


Client -> Mochiweb -> RabbitMQ (via Erlang RabbitMQ Client code) -> Python
consumer (using the Python CARROT AMQP library)


I have everything working right until the Python consumer picks up the
message. I get the following error:


"No JSON object could be decoded" 


 Let me step back a second.....here is an example of the BINARY sent from
the Erlang client (inside Mochiweb) to RabbitMQ:


NOTE: I have simplified the call by just making a binary called "Hello
World" for "Payload"


Payload = <<"Hello World">>,

                Content = #content{class_id = 60,

                     properties = amqp_util:basic_properties(),

                     properties_bin = none, 

                     payload_fragments_rev = [Payload]


                amqp_channel:cast(Channel, BasicPublish, Content),


When the Python JSON library (decoder.py) receives this I can see the
message is formatted like:


'Hello World'


But if I send to RabbitMQ like follows using PYTHON..


from carrot.messaging import Publisher

from carrot.connection import AMQPConnection


amqpconn = AMQPConnection(hostname="localhost", port=5672, userid="guest",

publisher = Publisher(connection=amqpconn, exchange="amq.direct",

publisher.send('Hello World')



I get the following for the message in the Python JSON library (decoder.py):


'"Hello World"'


NOTE the subtle different between the two.....the first one is 'Hello World'
(from Erlang) and the second (from Python) is '"Hello World"'


I am just wondering if this is a "Unicode" thing or do I need to do
something to the Erlang BINARY before sending it to RabbitMQ?


I think this could also have to do with the BUILT IN JSON library in Python
2.6......I will look into that.....


Thanks for the help....much appreciated ;-)





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