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#!/usr/bin/env python
"""
direct_consumer.py
This AMQP client reads messages from a message
queue named "message_queue".
"""
import qpid
import sys
from qpid.client import Client
from qpid.content import Content
from qpid.queue import Empty
#----- 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.session_open()
#----- Read from queue --------------------------------------------
# Now let's create a local client queue and tell it to read
# incoming messages.
# The consumer tag identifies the client-side queue.
consumer_tag = "consumer1"
queue = client.queue(consumer_tag)
# Call message_consume() to tell the broker to deliver messages
# from the AMQP queue to this local client queue. The broker will
# start delivering messages as soon as message_consume() is called.
session.message_subscribe(queue="message_queue", destination=consumer_tag)
session.message_flow(consumer_tag, 0, 0xFFFFFFFF) # Kill these?
session.message_flow(consumer_tag, 1, 0xFFFFFFFF) # Kill these?
# Initialize 'final' and 'content', variables used to identify the last message.
final = "That's all, folks!" # In a message body, signals the last message
content = "" # Content of the last message read
message = None
while content != final:
message = queue.get(timeout=10)
content = message.content.body
print content
# Messages are not removed from the queue until they are
# acknowledged. Using cumulative=True, all messages from 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.
message.complete(cumulative=True)
#----- Cleanup ------------------------------------------------
# Clean up before exiting so there are no open threads.
#
session.session_close()
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