Python examples

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@599876 13f79535-47bb-0310-9956-ffa450edef68

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diff --git a/python/examples/request-response/client.py b/python/examples/request-response/client.py
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+#!/usr/bin/env python
+"""
+ client.py
+
+ Client for a client/server example
+
+"""
+
+import base64
+
+import qpid
+from qpid.client import Client
+from qpid.content import Content
+from qpid.queue import Empty
+
+#----- Functions -------------------------------------------
+
+def dump_queue(client, queue_name):
+
+  print "Messages queue: " + queue_name 
+
+  consumer_tag = queue_name     # Use the queue name as the consumer tag - need a unique tag
+  queue = client.queue(consumer_tag)
+
+  # Call basic_consume() to tell the broker to deliver messages
+  # from the AMQP queue to a local client queue. The broker will
+  # start delivering messages as soon as basic_consume() is called.
+
+  session.message_subscribe(queue=queue_name, destination=consumer_tag)
+  session.message_flow(consumer_tag, 0, 0xFFFFFFFF)
+  session.message_flow(consumer_tag, 1, 0xFFFFFFFF)
+
+  message = 0
+
+  while True:
+    try:
+      message = queue.get(timeout=10)
+      content = message.content.body
+      print "Response: " + content
+    except Empty:
+      print "No more messages!"
+      break
+    except:
+      print "Unexpected exception!"
+      break
+
+
+  #  Messages are not removed from the queue until they
+  #  are acknowledged. Using multiple=True, all messages
+  #  in the channel up to and including the one identified
+  #  by the delivery tag are acknowledged. This is more efficient,
+  #  because there are fewer network round-trips.
+
+  if message != 0:
+    message.complete(cumulative=True)
+
+
+#----- Initialization --------------------------------------
+
+#  Set parameters for login
+
+host="127.0.0.1"
+port=5672
+amqp_spec="/usr/share/amqp/amqp.0-10-preview.xml"
+user="guest"
+password="guest"
+
+#  Create a client and log in to it.
+
+spec = qpid.spec.load(amqp_spec)
+client = Client(host, port, spec)
+client.start({"LOGIN": user, "PASSWORD": password})
+
+session = client.session()
+session.session_open() 
+
+#----- 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.
+
+replyTo = "ReplyTo:" # + base64.urlsafe_b64encode(session.session_id)
+session.queue_declare(queue=replyTo, exclusive=True)
+session.queue_bind(exchange="amq.direct", queue=replyTo, routing_key=replyTo)
+
+# Send some messages to the server's request queue
+
+lines = ["Twas brilling, and the slithy toves",
+         "Did gyre and gimble in the wabe.",
+         "All mimsy were the borogroves,",
+         "And the mome raths outgrabe."]
+
+for l in lines:
+  print "Request: " + l
+  request=Content(l)
+  request["routing_key"] = "request"
+  request["reply_to"] = client.spec.struct("reply_to")
+  request["reply_to"]["exchange_name"] = "amq.direct"
+  request["reply_to"]["routing_key"] = replyTo
+  session.message_transfer(destination="amq.direct", content=request)
+
+# Now see what messages the server sent to our replyTo queue
+
+dump_queue(client, replyTo)
+
+
+#----- Cleanup ------------------------------------------------
+
+# Clean up before exiting so there are no open threads.
+
+session.session_close()