examples/datatypes/client.py

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

 Client for testing use of Unicode and datatypes.

 Both client and server will be written in C++ and Python.
 Tests can run clients and servers written in different
 languages, and they can be run on 32-bit and 64-bit architectures.

"""

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

import testdata

#----- 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()))


#----- Main Body -- ----------------------------------------

# Create a response queue for the server to send responses to. Use the
# same string as the name of the queue and the name of the routing
# key.

reply_to = "reply_to:" + session.name
session.queue_declare(queue=reply_to, exclusive=True)
session.exchange_bind(exchange="amq.direct", queue=reply_to, binding_key=reply_to)

# Create a local queue and subscribe it to the response queue

local_queue_name = "local_queue"
queue = session.incoming(local_queue_name)

# Call message_subscribe() to tell the broker to deliver messages from
# the server's reply_to queue to our local client queue. The server
# will start delivering messages as soon as message credit is
# available.

session.message_subscribe(queue=reply_to, destination=local_queue_name)
queue.start()

# Set up the properties. Perhaps a few application headers?

delivery_properties = session.delivery_properties(routing_key="request")

message_properties = session.message_properties()

message_properties.content_encoding="text/plain; charset='utf-8'"

testdata.set_application_headers(message_properties)
message_properties.reply_to = session.reply_to("amq.direct", reply_to)

# deliver the message - remember to encode the Unicode string!
request = Message(message_properties, delivery_properties, testdata.String_Greek.encode("utf8"))
session.message_transfer(destination="amq.direct", message=request)

# Now see what messages the server sent to our reply_to queue

try:
  response = queue.get(timeout=10)
  content = response.body
  session.message_accept(RangedSet(response.id))
  testdata.check_message(response)
  print "Response: " + content
except Empty:
  print "No more messages!"
  exit(1)
except:
  print "Unexpected exception!"
  exit(1)

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

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

session.close(timeout=10)