kombu/examples/demo_receive.py

47 lines
1.6 KiB
Python

"""
Example of simple consumer that waits for a single message, acknowledges it
and exits.
"""
from kombu import BrokerConnection, Exchange, Queue, Consumer
from pprint import pformat
#: By default messages sent to exchanges are persistent (delivery_mode=2),
#: and queues and exchanges are durable.
exchange = Exchange("kombu_demo", type="direct")
queue = Queue("kombu_demo", exchange, routing_key="kombu_demo")
def pretty(obj):
return pformat(obj, indent=4)
#: This is the callback applied when a message is received.
def handle_message(body, message):
print("Received message: %r" % (body, ))
print(" properties:\n%s" % (pretty(message.properties), ))
print(" delivery_info:\n%s" % (pretty(message.delivery_info), ))
message.ack()
#: Create a connection and a channel.
#: If hostname, userid, password and virtual_host is not specified
#: the values below are the default, but listed here so it can
#: be easily changed.
connection = BrokerConnection(hostname="localhost",
userid="guest",
password="guest",
virtual_host="/")
channel = connection.channel()
#: Create consumer using our callback and queue.
#: Second argument can also be a list to consume from
#: any number of queues.
consumer = Consumer(channel, queue, callbacks=[handle_message])
consumer.consume()
#: This waits for a single event. Note that this event may not
#: be a message, or a message that is to be delivered to the consumers
#: channel, but any event received on the connection.
connection.drain_events()