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#!/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)
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