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#!/usr/bin/env python
"""
client.py
Client for a client/server example
"""
import qpid
import sys
import os
from qpid.util import connect
from qpid.connection import Connection
from qpid.datatypes import Message, RangedSet, uuid4
from qpid.queue import Empty
#----- Functions -------------------------------------------
def dump_queue(queue_name):
print "Messages queue: " + queue_name
consumer_tag = queue_name # Use the queue name as the consumer tag - need a unique tag
queue = session.incoming(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)
message = 0
while True:
try:
message = queue.get(timeout=10)
content = message.body
session.message_accept(RangedSet(message.id))
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
user="guest"
password="guest"
amqp_spec=""
try:
amqp_spec = os.environ["AMQP_SPEC"]
except KeyError:
amqp_spec="/usr/share/amqp/amqp.0-10.xml"
# Create a connection.
conn = Connection (connect (host,port), qpid.spec.load(amqp_spec))
conn.start()
session_id = str(uuid4())
session = conn.session(session_id)
#----- Main Body -- ----------------------------------------
# Create a response queue for the server to send responses to. Use the
# same string as the name of the queue and the name of the routing
# key.
replyTo = "ReplyTo:" + session_id
session.queue_declare(queue=replyTo, exclusive=True)
session.exchange_bind(exchange="amq.direct", queue=replyTo, binding_key=replyTo)
# Send some messages to the server's request queue
lines = ["Twas brilling, and the slithy toves",
"Did gyre and gimble in the wabe.",
"All mimsy were the borogroves,",
"And the mome raths outgrabe."]
for ln in lines:
print "Request: " + ln
mp = session.message_properties()
mp.reply_to = session.reply_to("amq.direct", replyTo)
dp = session.delivery_properties(routing_key="request")
session.message_transfer("amq.direct", None, None, Message(mp,dp,ln))
# Now see what messages the server sent to our replyTo queue
dump_queue(replyTo)
#----- Cleanup ------------------------------------------------
# Clean up before exiting so there are no open threads.
session.close(timeout=10)
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