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aio-pika

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A wrapper around aiormq for asyncio and humans.

Check out the examples and the tutorial in the documentation.

If you are a newcomer to RabbitMQ, please start with the adopted official RabbitMQ tutorial.

Note

Since version 5.0.0 this library doesn't use pika as AMQP connector. Versions below 5.0.0 contains or requires pika's source code.

Note

The version 7.0.0 has breaking API changes, see CHANGELOG.md for migration hints.

Features

  • Completely asynchronous API.
  • Object oriented API.
  • Transparent auto-reconnects with complete state recovery with connect_robust (e.g. declared queues or exchanges, consuming state and bindings).
  • Python 3.7+ compatible.
  • For python 3.5 users, aio-pika is available via aio-pika<7.
  • Transparent publisher confirms support.
  • Transactions support.
  • Complete type-hints coverage.

Installation

pip install aio-pika

Usage example

Simple consumer:

import asyncio
import aio_pika
import aio_pika.abc


async def main(loop):
    # Connecting with the given parameters is also possible.
    # aio_pika.connect_robust(host="host", login="login", password="password")
    # You can only choose one option to create a connection, url or kw-based params.
    connection = await aio_pika.connect_robust(
        "amqp://guest:guest@127.0.0.1/", loop=loop
    )

    async with connection:
        queue_name = "test_queue"

        # Creating channel
        channel: aio_pika.abc.AbstractChannel = await connection.channel()

        # Declaring queue
        queue: aio_pika.abc.AbstractQueue = await channel.declare_queue(
            queue_name,
            auto_delete=True
        )

        async with queue.iterator() as queue_iter:
            # Cancel consuming after __aexit__
            async for message in queue_iter:
                async with message.process():
                    print(message.body)

                    if queue.name in message.body.decode():
                        break


if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main(loop))
    loop.close()

Simple publisher:

import asyncio
import aio_pika
import aio_pika.abc


async def main(loop):
    # Explicit type annotation
    connection: aio_pika.RobustConnection = await aio_pika.connect_robust(
        "amqp://guest:guest@127.0.0.1/", loop=loop
    )

    routing_key = "test_queue"

    channel: aio_pika.abc.AbstractChannel = await connection.channel()

    await channel.default_exchange.publish(
        aio_pika.Message(
            body='Hello {}'.format(routing_key).encode()
        ),
        routing_key=routing_key
    )

    await connection.close()


if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main(loop))
    loop.close()

Get single message example:

import asyncio
from aio_pika import connect_robust, Message


async def main(loop):
    connection = await connect_robust(
        "amqp://guest:guest@127.0.0.1/",
        loop=loop
    )

    queue_name = "test_queue"
    routing_key = "test_queue"

    # Creating channel
    channel = await connection.channel()

    # Declaring exchange
    exchange = await channel.declare_exchange('direct', auto_delete=True)

    # Declaring queue
    queue = await channel.declare_queue(queue_name, auto_delete=True)

    # Binding queue
    await queue.bind(exchange, routing_key)

    await exchange.publish(
        Message(
            bytes('Hello', 'utf-8'),
            content_type='text/plain',
            headers={'foo': 'bar'}
        ),
        routing_key
    )

    # Receiving message
    incoming_message = await queue.get(timeout=5)

    # Confirm message
    await incoming_message.ack()

    await queue.unbind(exchange, routing_key)
    await queue.delete()
    await connection.close()


if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main(loop))

There are more examples and the RabbitMQ tutorial in the documentation.

See also

aiormq

aiormq is a pure python AMQP client library. It is under the hood of aio-pika and might to be used when you really loving works with the protocol low level. Following examples demonstrates the user API.

Simple consumer:

import asyncio
import aiormq

async def on_message(message):
    """
    on_message doesn't necessarily have to be defined as async.
    Here it is to show that it's possible.
    """
    print(f" [x] Received message {message!r}")
    print(f"Message body is: {message.body!r}")
    print("Before sleep!")
    await asyncio.sleep(5)   # Represents async I/O operations
    print("After sleep!")

async def main():
    # Perform connection
    connection = await aiormq.connect("amqp://guest:guest@localhost/")

    # Creating a channel
    channel = await connection.channel()

    # Declaring queue
    declare_ok = await channel.queue_declare('helo')
    consume_ok = await channel.basic_consume(
        declare_ok.queue, on_message, no_ack=True
    )

loop = asyncio.get_event_loop()
loop.run_until_complete(main())
loop.run_forever()

Simple publisher:

import asyncio
from typing import Optional

import aiormq
from aiormq.abc import DeliveredMessage

MESSAGE: Optional[DeliveredMessage] = None

async def main():
    global MESSAGE
    body = b'Hello World!'

    # Perform connection
    connection = await aiormq.connect("amqp://guest:guest@localhost//")

    # Creating a channel
    channel = await connection.channel()
    declare_ok = await channel.queue_declare("hello", auto_delete=True)

    # Sending the message
    await channel.basic_publish(body, routing_key='hello')
    print(f" [x] Sent {body}")

    MESSAGE = await channel.basic_get(declare_ok.queue)
    print(f" [x] Received message from {declare_ok.queue!r}")

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

assert MESSAGE is not None
assert MESSAGE.routing_key == "hello"
assert MESSAGE.body == b'Hello World!'

The patio and the patio-rabbitmq

PATIO is an acronym for Python Asynchronous Tasks for AsyncIO - an easily extensible library, for distributed task execution, like celery, only targeting asyncio as the main design approach.

patio-rabbitmq provides you with the ability to use RPC over RabbitMQ services with extremely simple implementation:

from patio import Registry, ThreadPoolExecutor
from patio_rabbitmq import RabbitMQBroker

rpc = Registry(project="patio-rabbitmq", auto_naming=False)

@rpc("sum")
def sum(*args):
    return sum(args)

async def main():
    async with ThreadPoolExecutor(rpc, max_workers=16) as executor:
        async with RabbitMQBroker(
            executor, amqp_url="amqp://guest:guest@localhost/",
        ) as broker:
            await broker.join()

And the caller side might be written like this:

import asyncio
from patio import NullExecutor, Registry
from patio_rabbitmq import RabbitMQBroker

async def main():
    async with NullExecutor(Registry(project="patio-rabbitmq")) as executor:
        async with RabbitMQBroker(
            executor, amqp_url="amqp://guest:guest@localhost/",
        ) as broker:
            print(await asyncio.gather(
                *[
                    broker.call("mul", i, i, timeout=1) for i in range(10)
                 ]
            ))

Propan🔥

Propan is a powerful and easy-to-use Python framework for building event-driven applications that interact with any MQ Broker.

If you need no deep dive into RabbitMQ details, you can use more high-level Propan interfaces:

from propan import PropanApp, RabbitBroker

broker = RabbitBroker("amqp://guest:guest@localhost:5672/")
app = PropanApp(broker)

@broker.handle("user")
async def user_created(user_id: int):
    assert isinstance(user_id, int)
    return f"user-{user_id}: created"

@app.after_startup
async def pub_smth():
    assert (
        await broker.publish(1, "user", callback=True)
    ) ==  "user-1: created"

Also, Propan validates messages by pydantic, generates your project AsyncAPI spec, tests application locally, RPC calls, and more.

In fact, it is a high-level wrapper on top of aio-pika, so you can use both of these libraries' advantages at the same time.

python-socketio

Socket.IO is a transport protocol that enables real-time bidirectional event-based communication between clients (typically, though not always, web browsers) and a server. This package provides Python implementations of both, each with standard and asyncio variants.

Also this package is suitable for building messaging services over RabbitMQ via aio-pika adapter:

import socketio
from aiohttp import web

sio = socketio.AsyncServer(client_manager=socketio.AsyncAioPikaManager())
app = web.Application()
sio.attach(app)

@sio.event
async def chat_message(sid, data):
    print("message ", data)

if __name__ == '__main__':
    web.run_app(app)

And a client is able to call chat_message the following way:

import asyncio
import socketio

sio = socketio.AsyncClient()

async def main():
    await sio.connect('http://localhost:8080')
    await sio.emit('chat_message', {'response': 'my response'})

if __name__ == '__main__':
    asyncio.run(main())

The taskiq and the taskiq-aio-pika

Taskiq is an asynchronous distributed task queue for python. The project takes inspiration from big projects such as Celery and Dramatiq. But taskiq can send and run both the sync and async functions.

The library provides you with aio-pika broker for running tasks too.

from taskiq_aio_pika import AioPikaBroker

broker = AioPikaBroker()

@broker.task
async def test() -> None:
    print("nothing")

async def main():
    await broker.startup()
    await test.kiq()

Rasa

With over 25 million downloads, Rasa Open Source is the most popular open source framework for building chat and voice-based AI assistants.

With Rasa, you can build contextual assistants on:

  • Facebook Messenger
  • Slack
  • Google Hangouts
  • Webex Teams
  • Microsoft Bot Framework
  • Rocket.Chat
  • Mattermost
  • Telegram
  • Twilio

Your own custom conversational channels or voice assistants as:

  • Alexa Skills
  • Google Home Actions

Rasa helps you build contextual assistants capable of having layered conversations with lots of back-and-forth. In order for a human to have a meaningful exchange with a contextual assistant, the assistant needs to be able to use context to build on things that were previously discussed – Rasa enables you to build assistants that can do this in a scalable way.

And it also uses aio-pika to interact with RabbitMQ deep inside!

Versioning

This software follows Semantic Versioning

For contributors

Setting up development environment

Clone the project:

git clone https://github.com/mosquito/aio-pika.git
cd aio-pika

Create a new virtualenv for aio-pika:

python3 -m venv env
source env/bin/activate

Install all requirements for aio-pika:

pip install -e '.[develop]'

Running Tests

NOTE: In order to run the tests locally you need to run a RabbitMQ instance with default user/password (guest/guest) and port (5672).

The Makefile provides a command to run an appropriate RabbitMQ Docker image:

make rabbitmq

To test just run:

make test

Editing Documentation

To iterate quickly on the documentation live in your browser, try:

nox -s docs -- serve

Creating Pull Requests

Please feel free to create pull requests, but you should describe your use cases and add some examples.

Changes should follow a few simple rules:

  • When your changes break the public API, you must increase the major version.
  • When your changes are safe for public API (e.g. added an argument with default value)
  • You have to add test cases (see tests/ folder)
  • You must add docstrings
  • Feel free to add yourself to "thank's to" section