#!/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. # """ server.py Server 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 respond(session, request): # The routing key for the response is the request's reply-to # property. The body for the response is the request's body, # converted to upper case. message_properties = request.get("message_properties") reply_to = message_properties.reply_to if reply_to == None: raise Exception("This message is missing the 'reply_to' property, which is required") props = session.delivery_properties(routing_key=reply_to["routing_key"]) session.message_transfer(destination=reply_to["exchange"], message=Message(props,request.body.upper())) #----- 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]) socket = connect(host, port) connection = Connection (sock=socket, username=user, password=password) connection.start() session = connection.session(str(uuid4())) #----- Main Body -- ---------------------------------------- # Create a request queue and subscribe to it session.queue_declare(queue="request", exclusive=True) session.exchange_bind(exchange="amq.direct", queue="request", binding_key="request") local_queue_name = "local_queue" session.message_subscribe(queue="request", destination=local_queue_name) queue = session.incoming(local_queue_name) queue.start() # Remind the user to start the client program print "Request server running - run your client now." print "(Times out after 100 seconds ...)" sys.stdout.flush() # Respond to each request # If we get a message, send it back to the user (as indicated in the # ReplyTo property) while True: try: request = queue.get(timeout=100) respond(session, request) session.message_accept(RangedSet(request.id)) except Empty: print "No more messages!" break; #----- Cleanup ------------------------------------------------ # Clean up before exiting so there are no open threads. session.close(timeout=10)