#!/usr/bin/env python
"""
 topic_publisher.py

 This is a simple AMQP publisher application that uses a 
 Topic exchange. The publisher specifies the routing key
 and the exchange for each message.
"""

import qpid
import sys
import os
from random import randint
from qpid.util import connect
from qpid.connection import Connection
from qpid.datatypes import Message
from qpid.queue import Empty

#----- Initialization -----------------------------------

#  Set parameters for login. 
host=len(sys.argv) > 1 and sys.argv[1] or "127.0.0.1"
port=len(sys.argv) > 2 and int(sys.argv[2]) or 5672
user="guest"
password="guest"
amqp_spec=""

try:
     amqp_spec = os.environ["AMQP_SPEC"]
except KeyError:
     amqp_spec="/usr/share/amqp/amqp.0-10.xml"

#  Create a connection.
conn = Connection (connect (host,port), qpid.spec.load(amqp_spec))
conn.start()

session = conn.session(str(randint(1,64*1024)))

#----- Publish some messages ------------------------------

# Create some messages and put them on the broker. Use the
# topic exchange.  The routing keys are "usa.news", "usa.weather", 
# "europe.news", and "europe.weather".

def send_msg(routing_key):
  props = session.delivery_properties(routing_key=routing_key)
  for i in range(5):
     session.message_transfer("amq.topic", None, None, Message(props,"message " + str(i)))

# usa.news
send_msg("usa.news")

# usa.weather
send_msg("usa.weather")

# europe.news
send_msg("europe.news")

# europe.weather
send_msg("europe.weather")

# Signal termination
props = session.delivery_properties(routing_key="control")
session.message_transfer("amq.topic",None, None, Message(props,"That's all, folks!"))


#----- Cleanup --------------------------------------------

# Clean up before exiting so there are no open threads.

session.close(timeout=10)
