#!/usr/bin/env python
#
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# to you under the Apache License, Version 2.0 (the
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# with the License.  You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing,
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"""
 declare_queues.py 

 Creates and binds a queue on an AMQP direct exchange.

 All messages using the routing key "routing_key" are
 sent to the queue named "message_queue".
"""

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

#----- 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])

#  Create a connection.
socket = connect(host, port)
connection = Connection (sock=socket, username=user, password=password)
connection.start()
session = connection.session(str(uuid4()))

#----- Create a queue -------------------------------------

# queue_declare() creates an AMQP queue, which is held
# on the broker. Published messages are sent to the AMQP queue, 
# from which messages are delivered to consumers. 
# 
# queue_bind() determines which messages are routed to a queue. 
# Route all messages with the routing key "routing_key" to
# the AMQP queue named "message_queue".

session.exchange_declare(exchange="xml", type="xml")
session.queue_declare(queue="message_queue")

binding = {}
binding["xquery"] = """
   let $w := ./weather
   return $w/station = 'Raleigh-Durham International Airport (KRDU)'
      and $w/temperature_f > 50
      and $w/temperature_f - $w/dewpoint > 5
      and $w/wind_speed_mph > 7
      and $w/wind_speed_mph < 20 """
                      

session.exchange_bind(exchange="xml", queue="message_queue", binding_key="weather", arguments=binding)


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

session.close()