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bazarr/libs3/socketio/asyncio_aiopika_manager.py
Louis Vézina e562d5e7bb WIP
2020-01-20 19:35:55 -05:00

105 lines
4.1 KiB
Python

import asyncio
import pickle
from socketio.asyncio_pubsub_manager import AsyncPubSubManager
try:
import aio_pika
except ImportError:
aio_pika = None
class AsyncAioPikaManager(AsyncPubSubManager): # pragma: no cover
"""Client manager that uses aio_pika for inter-process messaging under
asyncio.
This class implements a client manager backend for event sharing across
multiple processes, using RabbitMQ
To use a aio_pika backend, initialize the :class:`Server` instance as
follows::
url = 'amqp://user:password@hostname:port//'
server = socketio.Server(client_manager=socketio.AsyncAioPikaManager(
url))
:param url: The connection URL for the backend messaging queue. Example
connection URLs are ``'amqp://guest:guest@localhost:5672//'``
for RabbitMQ.
:param channel: The channel name on which the server sends and receives
notifications. Must be the same in all the servers.
With this manager, the channel name is the exchange name
in rabbitmq
:param write_only: If set ot ``True``, only initialize to emit events. The
default of ``False`` initializes the class for emitting
and receiving.
"""
name = 'asyncaiopika'
def __init__(self, url='amqp://guest:guest@localhost:5672//',
channel='socketio', write_only=False, logger=None):
if aio_pika is None:
raise RuntimeError('aio_pika package is not installed '
'(Run "pip install aio_pika" in your '
'virtualenv).')
self.url = url
self.listener_connection = None
self.listener_channel = None
self.listener_queue = None
super().__init__(channel=channel, write_only=write_only, logger=logger)
async def _connection(self):
return await aio_pika.connect_robust(self.url)
async def _channel(self, connection):
return await connection.channel()
async def _exchange(self, channel):
return await channel.declare_exchange(self.channel,
aio_pika.ExchangeType.FANOUT)
async def _queue(self, channel, exchange):
queue = await channel.declare_queue(durable=False,
arguments={'x-expires': 300000})
await queue.bind(exchange)
return queue
async def _publish(self, data):
connection = await self._connection()
channel = await self._channel(connection)
exchange = await self._exchange(channel)
await exchange.publish(
aio_pika.Message(body=pickle.dumps(data),
delivery_mode=aio_pika.DeliveryMode.PERSISTENT),
routing_key='*'
)
async def _listen(self):
retry_sleep = 1
while True:
try:
if self.listener_connection is None:
self.listener_connection = await self._connection()
self.listener_channel = await self._channel(
self.listener_connection
)
await self.listener_channel.set_qos(prefetch_count=1)
exchange = await self._exchange(self.listener_channel)
self.listener_queue = await self._queue(
self.listener_channel, exchange
)
async with self.listener_queue.iterator() as queue_iter:
async for message in queue_iter:
with message.process():
return pickle.loads(message.body)
except Exception:
self._get_logger().error('Cannot receive from rabbitmq... '
'retrying in '
'{} secs'.format(retry_sleep))
self.listener_connection = None
await asyncio.sleep(retry_sleep)
retry_sleep *= 2
if retry_sleep > 60:
retry_sleep = 60