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"""
Example of simple consumer that waits for a single message, acknowledges it
and exits.
"""
from kombu import Connection, Exchange, Queue, Consumer, eventloop
from pprint import pformat
#: By default messages sent to exchanges are persistent (delivery_mode=2),
#: and queues and exchanges are durable.
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.
with Connection('pyamqp://guest:guest@localhost:5672//') as connection:
# The configuration of the message flow is as follows:
# gateway_kombu_exchange -> internal_kombu_exchange -> kombu_demo queue
gateway_exchange = Exchange('gateway_kombu_demo')(connection)
exchange = Exchange('internal_kombu_demo')(connection)
gateway_exchange.declare()
exchange.declare()
exchange.bind_to(gateway_exchange, routing_key='kombu_demo')
queue = Queue('kombu_demo', exchange, routing_key='kombu_demo')
#: Create consumer using our callback and queue.
#: Second argument can also be a list to consume from
#: any number of queues.
with Consumer(connection, queue, callbacks=[handle_message]):
#: 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.
recv = eventloop(connection)
while True:
recv.next()
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