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=====================================================================
Python AMQP 0.9.1 client library
=====================================================================
|build-status| |coverage| |license| |wheel| |pyversion| |pyimp|
:Version: 5.0.2
: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-block::
CELERY_ENABLE_SPEEDUPS=true pip install --no-binary :all: amqp
2. building directly source code:
.. code-block::
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://api.travis-ci.com/celery/py-amqp.png?branch=master
:alt: Build status
:target: https://travis-ci.com/celery/py-amqp
.. |coverage| image:: https://codecov.io/github/celery/py-amqp/coverage.svg?branch=master
:target: https://codecov.io/github/celery/py-amqp?branch=master
.. |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
=======
The maintainers of py-amqp and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. [Learn more.](https://tidelift.com/subscription/pkg/pypi-amqp?utm_source=pypi-amqp&utm_medium=referral&utm_campaign=readme&utm_term=repo)
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