Identifying the message sender with Rabbit MQ (and Pika)

When sending a message via Rabbit MQ, a sender can chose to identify itself, or hid its identity, but it cannot lie.

I modified the Pika examples to work with hard coded user-id and password. Specifically, I added:

properties = pika.BasicProperties(user_id=rabbit_userid);

And used that as a parameter in:

channel.basic_publish(exchange='',
                      properties=properties,
                      routing_key='hello',
                      body='Hello World!')

On the receiving side, in the callback, make use of the properties:

def callback(ch, method, properties, body):
    print(" [x] Received %r" % body)
    print("Message user_id is %s " % properties.user_id)

And the output looks like this:


$ python recv.py &
[1] 5062
$  [*] Waiting for messages. To exit press CTRL+C
$ python sender.py 
 [x] Sent 'Hello World!'
 [x] Received 'Hello World!'
Message user_id is a5f56bdb395f53864a80b95f45dc395e94c546c7 

Modify the sender so the ids don’t match and:

    raise exceptions.ChannelClosed(method.reply_code, method.reply_text)
pika.exceptions.ChannelClosed: (406, "PRECONDITION_FAILED - user_id property set to 'rabbit_userid' but authenticated user was 'a5f56bdb395f53864a80b95f45dc395e94c546c7'")

Here is the complete code.

sender.py

#!/usr/bin/env python
import pika

rabbit_host = '10.149.2.1'
rabbit_userid = 'a5f56bdb395f53864a80b95f45dc395e94c546c7'
rabbit_password = '06814091f31ad50b55a3509e9e3916082cce556d'
credentials = pika.PlainCredentials(rabbit_userid, rabbit_password)

connection = pika.BlockingConnection(pika.ConnectionParameters(
    host=rabbit_host, credentials=credentials))
channel = connection.channel()
channel.queue_declare(queue='hello')
properties = pika.BasicProperties(user_id=rabbit_userid);
channel.basic_publish(exchange='',
                      properties=properties,
                      routing_key='hello',
                      body='Hello World!')
print(" [x] Sent 'Hello World!'")
connection.close()

recv.py

#!/usr/bin/env python
import pika

rabbit_host = '10.149.2.1'
rabbit_userid = 'a5f56bdb395f53864a80b95f45dc395e94c546c7'
rabbit_password = '06814091f31ad50b55a3509e9e3916082cce556d'
credentials = pika.PlainCredentials(rabbit_userid, rabbit_password)

connection = pika.BlockingConnection(pika.ConnectionParameters(
    host=rabbit_host, credentials=credentials))
channel = connection.channel()

channel.queue_declare(queue='hello')

def callback(ch, method, properties, body):
    print(" [x] Received %r" % body)
    print("Message user_id is %s " % properties.user_id)

channel.basic_consume(callback,
                      queue='hello',
                      no_ack=True)

print(' [*] Waiting for messages. To exit press CTRL+C')
channel.start_consuming()

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