Low-level AMQP client for Python (fork of amqplib).
Project description
- Version:
5.2.0
- Web:
- Download:
- Source:
- Keywords:
amqp, rabbitmq
About
This is a fork of amqplib which was originally written by Barry Pederson. It is maintained by the Celery project, and used by kombu as a pure python alternative when librabbitmq is not available.
This library should be API compatible with librabbitmq.
Differences from amqplib
Supports draining events from multiple channels (Connection.drain_events)
Support for timeouts
Channels are restored after channel error, instead of having to close the connection.
Support for heartbeats
Connection.heartbeat_tick(rate=2) must called at regular intervals (half of the heartbeat value if rate is 2).
Or some other scheme by using Connection.send_heartbeat.
- Supports RabbitMQ extensions:
- Consumer Cancel Notifications
by default a cancel results in ChannelError being raised
but not if a on_cancel callback is passed to basic_consume.
- Publisher confirms
Channel.confirm_select() enables publisher confirms.
Channel.events['basic_ack'].append(my_callback) adds a callback to be called when a message is confirmed. This callback is then called with the signature (delivery_tag, multiple).
- Exchange-to-exchange bindings: exchange_bind / exchange_unbind.
Channel.confirm_select() enables publisher confirms.
Channel.events['basic_ack'].append(my_callback) adds a callback to be called when a message is confirmed. This callback is then called with the signature (delivery_tag, multiple).
- Authentication Failure Notifications
Instead of just closing the connection abruptly on invalid credentials, py-amqp will raise an AccessRefused error when connected to rabbitmq-server 3.2.0 or greater.
Support for basic_return
- Uses AMQP 0-9-1 instead of 0-8.
Channel.access_request and ticket arguments to methods removed.
Supports the arguments argument to basic_consume.
internal argument to exchange_declare removed.
auto_delete argument to exchange_declare deprecated
insist argument to Connection removed.
Channel.alerts has been removed.
Support for Channel.basic_recover_async.
Channel.basic_recover deprecated.
- Exceptions renamed to have idiomatic names:
AMQPException -> AMQPError
AMQPConnectionException -> ConnectionError``
AMQPChannelException -> ChannelError``
Connection.known_hosts removed.
Connection no longer supports redirects.
exchange argument to queue_bind can now be empty to use the “default exchange”.
Adds Connection.is_alive that tries to detect whether the connection can still be used.
Adds Connection.connection_errors and .channel_errors, a list of recoverable errors.
Exposes the underlying socket as Connection.sock.
Adds Channel.no_ack_consumers to keep track of consumer tags that set the no_ack flag.
Slightly better at error recovery
Quick overview
Simple producer publishing messages to test queue using default exchange:
import amqp
with amqp.Connection('broker.example.com') as c:
ch = c.channel()
ch.basic_publish(amqp.Message('Hello World'), routing_key='test')Producer publishing to test_exchange exchange with publisher confirms enabled and using virtual_host test_vhost:
import amqp
with amqp.Connection(
'broker.example.com', exchange='test_exchange',
confirm_publish=True, virtual_host='test_vhost'
) as c:
ch = c.channel()
ch.basic_publish(amqp.Message('Hello World'), routing_key='test')Consumer with acknowledgments enabled:
import amqp
with amqp.Connection('broker.example.com') as c:
ch = c.channel()
def on_message(message):
print('Received message (delivery tag: {}): {}'.format(message.delivery_tag, message.body))
ch.basic_ack(message.delivery_tag)
ch.basic_consume(queue='test', callback=on_message)
while True:
c.drain_events()Consumer with acknowledgments disabled:
import amqp
with amqp.Connection('broker.example.com') as c:
ch = c.channel()
def on_message(message):
print('Received message (delivery tag: {}): {}'.format(message.delivery_tag, message.body))
ch.basic_consume(queue='test', callback=on_message, no_ack=True)
while True:
c.drain_events()Speedups
This library has experimental support of speedups. Speedups are implemented using Cython. To enable speedups, CELERY_ENABLE_SPEEDUPS environment variable must be set during building/installation. Currently speedups can be installed:
using source package (using --no-binary switch):
CELERY_ENABLE_SPEEDUPS=true pip install --no-binary :all: amqpbuilding directly source code:
CELERY_ENABLE_SPEEDUPS=true python setup.py installFurther
Differences between AMQP 0.8 and 0.9.1
AMQP 0.9.1 Quick Reference
RabbitMQ Extensions
For more information about AMQP, visit
For other Python client libraries see:
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