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=====================================================================
Python AMQP 0.9.1 client library
=====================================================================
|build-status| |coverage| |license| |wheel| |pyversion| |pyimp|
:Version: 5.1.1
:Web: https://amqp.readthedocs.io/
:Download: https://pypi.org/project/amqp/
:Source: http://github.com/celery/py-amqp/
: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
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:
.. 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:
1. using source package (using ``--no-binary`` switch):
.. code:: shell
CELERY_ENABLE_SPEEDUPS=true pip install --no-binary :all: amqp
2. building directly source code:
.. code:: shell
CELERY_ENABLE_SPEEDUPS=true python setup.py install
Further
=======
- Differences between AMQP 0.8 and 0.9.1
http://www.rabbitmq.com/amqp-0-8-to-0-9-1.html
- AMQP 0.9.1 Quick Reference
http://www.rabbitmq.com/amqp-0-9-1-quickref.html
- RabbitMQ Extensions
http://www.rabbitmq.com/extensions.html
- For more information about AMQP, visit
http://www.amqp.org
- For other Python client libraries see:
http://www.rabbitmq.com/devtools.html#python-dev
.. |build-status| image:: https://github.com/celery/py-amqp/actions/workflows/ci.yaml/badge.svg
:alt: Build status
:target: https://github.com/celery/py-amqp/actions/workflows/ci.yaml
.. |coverage| image:: https://codecov.io/github/celery/py-amqp/coverage.svg?branch=main
:target: https://codecov.io/github/celery/py-amqp?branch=main
.. |license| image:: https://img.shields.io/pypi/l/amqp.svg
:alt: BSD License
:target: https://opensource.org/licenses/BSD-3-Clause
.. |wheel| image:: https://img.shields.io/pypi/wheel/amqp.svg
:alt: Python AMQP can be installed via wheel
:target: https://pypi.org/project/amqp/
.. |pyversion| image:: https://img.shields.io/pypi/pyversions/amqp.svg
:alt: Supported Python versions.
:target: https://pypi.org/project/amqp/
.. |pyimp| image:: https://img.shields.io/pypi/implementation/amqp.svg
:alt: Support Python implementations.
:target: https://pypi.org/project/amqp/
py-amqp as part of the Tidelift Subscription
============================================
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