python/examples/server.py

#!/usr/bin/env python3
#
# Licensed to the Apache Software Foundation (ASF) under one
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# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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import optparse
import sys
from proton import Condition, Message, Url
from proton.handlers import MessagingHandler
from proton.reactor import Container

exit_status = 0


class Server(MessagingHandler):
    def __init__(self, url, address):
        super(Server, self).__init__()
        self.url = url
        self.address = address

    def on_start(self, event):
        print("Listening on", self.url)
        self.container = event.container
        self.conn = event.container.connect(self.url, desired_capabilities="ANONYMOUS-RELAY")

    def on_connection_opened(self, event):
        capabilities = event.connection.remote_offered_capabilities
        if capabilities and 'ANONYMOUS-RELAY' in capabilities:
            self.receiver = event.container.create_receiver(self.conn, self.address)
            self.server = self.container.create_sender(self.conn, None)
        else:
            global exit_status
            print("Server needs a broker which supports ANONYMOUS-RELAY", file=sys.stderr)
            exit_status = 1
            c = event.connection
            c.condition = Condition('amqp:not-implemented', description="ANONYMOUS-RELAY required")
            c.close()

    def on_message(self, event):
        print("Received", event.message)
        self.server.send(Message(address=event.message.reply_to, body=event.message.body.upper(),
                                 correlation_id=event.message.correlation_id))


parser = optparse.OptionParser(usage="usage: %prog [options]")
parser.add_option("-a", "--address", default="localhost:5672/examples",
                  help="address from which messages are received (default %default)")
opts, args = parser.parse_args()

url = Url(opts.address)

try:
    Container(Server(url, url.path)).run()
except KeyboardInterrupt:
    pass

sys.exit(exit_status)