===================================================================== Python AMQP 0.9.1 client library =====================================================================
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:Version: 5.4.1 :Web: https://amqp.readthedocs.io/ :Download: https://pypi.org/project/amqp/ :Source: http://github.com/celery/py-amqp/ :DeepWiki: |deepwiki| :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_.
.. _amqplib: https://pypi.org/project/amqplib/ .. _Celery: http://celeryproject.org/ .. _kombu: https://kombu.readthedocs.io/ .. _librabbitmq: https://pypi.org/project/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
- 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:
.. code:: python
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:
.. code:: python
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:
.. code:: python
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:
.. code:: python
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):
.. code:: shell
CELERY_ENABLE_SPEEDUPS=true pip install --no-binary :all: amqp
- building directly source code:
CELERY_ENABLE_SPEEDUPS=true python setup.py install
Further =======
- 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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.. |license| image:: https://img.shields.io/pypi/l/amqp.svg :alt: BSD License :target: https://opensource.org/licenses/BSD-3-Clause
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.. |pyimp| image:: https://img.shields.io/pypi/implementation/amqp.svg :alt: Support Python implementations. :target: https://pypi.org/project/amqp/
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