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#!/usr/bin/env python
"""
client.py
Client for a client/server example
"""
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)
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.
spec = qpid.spec.load(amqp_spec)
client = Client(host, port, spec)
client.start({"LOGIN": user, "PASSWORD": password})
# Open the session. Save the session id.
session = client.session()
session_info = session.session_open()
session_id = session_info.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:" + base64.urlsafe_b64encode(session_id)
session.queue_declare(queue=replyTo, exclusive=True)
session.queue_bind(exchange="amq.direct", queue=replyTo, routing_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 l in lines:
print "Request: " + l
request=Content(l)
request["routing_key"] = "request"
request["reply_to"] = client.spec.struct("reply_to")
request["reply_to"]["exchange_name"] = "amq.direct"
request["reply_to"]["routing_key"] = replyTo
session.message_transfer(destination="amq.direct", content=request)
# Now see what messages the server sent to our replyTo queue
dump_queue(client, replyTo)
#----- Cleanup ------------------------------------------------
# Clean up before exiting so there are no open threads.
session.session_close()
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