#!/usr/bin/env python # # Licensed to the Apache Software Foundation (ASF) under one # or more contributor license agreements. See the NOTICE file # distributed with this work for additional information # regarding copyright ownership. The ASF licenses this file # to you under the Apache License, Version 2.0 (the # "License"); you may not use this file except in compliance # with the License. You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, # software distributed under the License is distributed on an # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY # KIND, either express or implied. See the License for the # specific language governing permissions and limitations # under the License. # """ 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 on queue: " + queue_name 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 #----- Initialization -------------------------------------- # Set parameters for login host="127.0.0.1" port=5672 user="guest" password="guest" # If an alternate host or port has been specified, use that instead # (this is used in our unit tests) if len(sys.argv) > 1 : host=sys.argv[1] if len(sys.argv) > 2 : port=int(sys.argv[2]) # Create a connection. socket = connect(host, port) connection = Connection (sock=socket, username=user, password=password) connection.start() session = connection.session(str(uuid4())) #----- 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. reply_to = "reply_to:" + session.name session.queue_declare(queue=reply_to, exclusive=True) session.exchange_bind(exchange="amq.direct", queue=reply_to, binding_key=reply_to) # Create a local queue and subscribe it to the response queue local_queue_name = "local_queue" queue = session.incoming(local_queue_name) # Call message_subscribe() to tell the broker to deliver messages from # the server's reply_to queue to our local client queue. The server # will start delivering messages as soon as message credit is # available. session.message_subscribe(queue=reply_to, destination=local_queue_name) queue.start() # Send some messages to the server's request queue lines = ["Twas brillig, and the slithy toves", "Did gyre and gimble in the wabe.", "All mimsy were the borogroves,", "And the mome raths outgrabe."] # We will use the same reply_to and routing key # for each message message_properties = session.message_properties() message_properties.reply_to = session.reply_to("amq.direct", reply_to) delivery_properties = session.delivery_properties(routing_key="request") for line in lines: print "Request: " + line session.message_transfer(destination="amq.direct", message=Message(message_properties, delivery_properties, line)) # Now see what messages the server sent to our reply_to queue dump_queue(reply_to) #----- Cleanup ------------------------------------------------ # Clean up before exiting so there are no open threads. session.close(timeout=10)