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#!/usr/bin/env python
"""
fanout_consumer.py
This AMQP client reads messages from a message
queue named "message_queue".
"""
import base64
import qpid
import sys
from qpid.client import Client
from qpid.content import Content
from qpid.queue import Empty
#----- Functions -------------------------------------------
def dump_queue(client, queue_name):
print "Messages queue: " + queue_name
consumer_tag = queue_name # Use the queue name as the consumer tag - need a unique tag
queue = client.queue(consumer_tag)
# Call message_subscribe() to tell the broker to deliver messages
# from the AMQP queue to a local client queue. The broker will
# start delivering messages as soon as message_subscribe() is called.
session.message_subscribe(queue=queue_name, destination=consumer_tag)
session.message_flow(consumer_tag, 0, 0xFFFFFFFF)
session.message_flow(consumer_tag, 1, 0xFFFFFFFF)
print "Subscribed to queue " + queue_name
sys.stdout.flush()
message = 0
while True:
try:
message = queue.get(timeout=10)
content = message.content.body
print "Response: " + content
except Empty:
print "No more messages!"
break
except:
print "Unexpected exception!"
break
# Messages are not removed from the queue until they
# are acknowledged. Using cumulative=True, all messages
# in the session up to and including the one identified
# by the delivery tag are acknowledged. This is more efficient,
# because there are fewer network round-trips.
if message != 0:
message.complete(cumulative=True)
#----- Initialization --------------------------------------
# Set parameters for login
host=len(sys.argv) > 1 and sys.argv[1] or "127.0.0.1"
port=len(sys.argv) > 2 and int(sys.argv[2]) or 5672
amqp_spec="/usr/share/amqp/amqp.0-10-preview.xml"
user="guest"
password="guest"
# Create a client and log in to it.
client = Client(host, port, qpid.spec.load(amqp_spec))
client.start({"LOGIN": user, "PASSWORD": password})
session = client.session()
session_info = session.session_open()
session_id = session_info.session_id
#----- Main Body -- ----------------------------------------
# Make a unique queue name for my queue from the session ID.
my_queue = base64.urlsafe_b64encode(session_id)
session.queue_declare(queue=my_queue)
# Bind my queue to the fanout exchange. No routing key is required
# the fanout exchange copies messages unconditionally to every
# bound queue
session.queue_bind(queue=my_queue, exchange="amq.fanout")
# Dump the messages on the queue.
dump_queue(client, my_queue)
#----- Cleanup ------------------------------------------------
# Clean up before exiting so there are no open threads.
#
session.session_close()
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