python/examples/colour_send.py

#!/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.
#

from __future__ import print_function, unicode_literals
import optparse
from proton import Message
from proton.handlers import MessagingHandler
from proton.reactor import Container

class Send(MessagingHandler):
    def __init__(self, url, messages):
        super(Send, self).__init__()
        self.url = url
        self.sent = 0
        self.confirmed = 0
        self.total = messages

    def on_start(self, event):
        event.container.create_sender(self.url)

    def on_sendable(self, event):
        while event.sender.credit and self.sent < self.total:
            if self.sent % 2:
                colour = 'red'
            else:
                colour = 'green'
            content = '%s %d' % (colour, self.sent+1)
            msg = Message(id=(self.sent+1), properties={'colour':colour}, body=content)
            event.sender.send(msg)
            self.sent += 1

    def on_accepted(self, event):
        self.confirmed += 1
        if self.confirmed == self.total:
            print("all messages confirmed")
            event.connection.close()

    def on_disconnected(self, event):
        self.sent = self.confirmed

parser = optparse.OptionParser(usage="usage: %prog [options]",
                               description="Send messages to the supplied address.")
parser.add_option("-a", "--address", default="localhost:5672/examples",
                  help="address to which messages are sent (default %default)")
parser.add_option("-m", "--messages", type="int", default=100,
                  help="number of messages to send (default %default)")
opts, args = parser.parse_args()

try:
    Container(Send(opts.address, opts.messages)).run()
except KeyboardInterrupt: pass