Pika is a RabbitMQ (AMQP-0-9-1) client library for Python.

Pika is a pure-Python implementation of the AMQP 0-9-1 protocol including RabbitMQ's extensions.

• Python 2.7 and 3.4+ are supported.
• Since threads aren't appropriate to every situation, it doesn't require threads. It takes care not to forbid them, either. The same goes for greenlets, callbacks, continuations and generators. It is not necessarily thread-safe however, and your mileage will vary.
• People may be using direct sockets, plain old select(), or any of the wide variety of ways of getting network events to and from a python application. Pika tries to stay compatible with all of these, and to make adapting it to a new environment as simple as possible.

Pika's documentation can be found at https://pika.readthedocs.io

Here is the most simple example of use, sending a message with the BlockingConnection adapter:

import pika connection = pika.BlockingConnection() channel = connection.channel() channel.basic_publish(exchange='example', routing_key='test', body=b'Test Message') connection.close()

And an example of writing a blocking consumer:

import pika connection = pika.BlockingConnection() channel = connection.channel() for method_frame, properties, body in channel.consume('test'): # Display the message parts and ack the message print(method_frame, properties, body) channel.basic_ack(method_frame.delivery_tag) # Escape out of the loop after 10 messages if method_frame.delivery_tag == 10: break # Cancel the consumer and return any pending messages requeued_messages = channel.cancel() print('Requeued %i messages' % requeued_messages) connection.close()

You can also pass multiple connection parameter instances for fault-tolerance as in the code snippet below (host names are just examples, of course). To enable retries, set connection_attempts and retry_delay as needed in the last pika.ConnectionParameters element of the sequence. Retries occur after connection attempts using all of the given connection parameters fail.

import pika configs = ( pika.ConnectionParameters(host='rabbitmq.zone1.yourdomain.com'), pika.ConnectionParameters(host='rabbitmq.zone2.yourdomain.com', connection_attempts=5, retry_delay=1)) connection = pika.BlockingConnection(configs)

With non-blocking adapters, you can request a connection using multiple connection parameter instances via the connection adapter's create_connection() class method.

• AsyncioConnection - adapter for the Python3 AsyncIO event loop
• BlockingConnection - enables blocking, synchronous operation on top of library for simple usage
• SelectConnection - fast asynchronous adapter without 3rd-party dependencies
• TornadoConnection - adapter for use with the Tornado IO Loop http://tornadoweb.org
• TwistedConnection - adapter for use with the Twisted asynchronous package http://twistedmatrix.com/

To contribute to pika, please make sure that any new features or changes to existing functionality include test coverage.

Pull requests that add or change code without coverage will be rejected.

Additionally, please format your code using yapf with google style prior to issuing your pull request.

New non-blocking adapters may be implemented in either of the following ways: - By subclassing :py:class:`pika.adapters.base_connection.BaseConnection` and

implementing its abstract method(s) and passing BaseConnection's constructor an implementation of :py.class:`pika.adapters.utils.nbio_interface.AbstractIOServices`. For examples, refer to the implementations of :py:class:`pika.AsyncioConnection` and :py:class:`pika.TornadoConnection`.

• By subclassing :py:class:`pika.connection.connection.Connection` and implementing its abstract method(s). For an example, refer to the implementation of :py:class:`pika.adapters.twisted_connection.TwistedProtocolConnection`.