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Diffstat (limited to 'trunk/qpid/python/examples/request-response/client.py')
-rwxr-xr-x | trunk/qpid/python/examples/request-response/client.py | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/trunk/qpid/python/examples/request-response/client.py b/trunk/qpid/python/examples/request-response/client.py new file mode 100755 index 0000000000..b29fcf3ea7 --- /dev/null +++ b/trunk/qpid/python/examples/request-response/client.py @@ -0,0 +1,131 @@ +#!/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) |