1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
#!/usr/bin/env python
"""
server.py
Server for a client/server example
"""
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
#----- Functions -------------------------------------------
def respond(session, request):
# The routing key for the response is the request's reply-to
# property. The body for the response is the request's body,
# converted to upper case.
message_properties = request.get("message_properties")
reply_to = message_properties.reply_to
if reply_to == None:
raise Exception("reply to property needs to be there")
props = session.delivery_properties(routing_key=reply_to["routing_key"])
session.message_transfer(reply_to["exchange"],None, None, Message(props,request.body.upper()))
#----- 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_id = str(uuid4())
session = conn.session(session_id)
#----- Main Body -- ----------------------------------------
# Create a request queue and subscribe to it
session.queue_declare(queue="request", exclusive=True)
session.exchange_bind(exchange="amq.direct", queue="request", binding_key="request")
dest = "request_destination"
session.message_subscribe(queue="request", destination=dest)
session.message_flow(dest, 0, 0xFFFFFFFF)
session.message_flow(dest, 1, 0xFFFFFFFF)
# Remind the user to start the client program
print "Request server running - run your client now."
print "(Times out after 100 seconds ...)"
sys.stdout.flush()
# Respond to each request
queue = session.incoming(dest)
# If we get a message, send it back to the user (as indicated in the
# ReplyTo property)
while True:
try:
request = queue.get(timeout=100)
respond(session, request)
session.message_accept(RangedSet(request.id))
except Empty:
print "No more messages!"
break;
#----- Cleanup ------------------------------------------------
# Clean up before exiting so there are no open threads.
session.close(timeout=10)
|
