forked from bton/matekasse
108 lines
4.2 KiB
Python
108 lines
4.2 KiB
Python
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import asyncio
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import pickle
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try: # pragma: no cover
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from redis import asyncio as aioredis
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from redis.exceptions import RedisError
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except ImportError: # pragma: no cover
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try:
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import aioredis
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from aioredis.exceptions import RedisError
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except ImportError:
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aioredis = None
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RedisError = None
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from .asyncio_pubsub_manager import AsyncPubSubManager
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class AsyncRedisManager(AsyncPubSubManager): # pragma: no cover
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"""Redis based client manager for asyncio servers.
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This class implements a Redis backend for event sharing across multiple
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processes.
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To use a Redis backend, initialize the :class:`AsyncServer` instance as
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follows::
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url = 'redis://hostname:port/0'
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server = socketio.AsyncServer(
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client_manager=socketio.AsyncRedisManager(url))
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:param url: The connection URL for the Redis server. For a default Redis
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store running on the same host, use ``redis://``. To use an
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SSL connection, use ``rediss://``.
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:param channel: The channel name on which the server sends and receives
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notifications. Must be the same in all the servers.
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:param write_only: If set to ``True``, only initialize to emit events. The
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default of ``False`` initializes the class for emitting
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and receiving.
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:param redis_options: additional keyword arguments to be passed to
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``aioredis.from_url()``.
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"""
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name = 'aioredis'
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def __init__(self, url='redis://localhost:6379/0', channel='socketio',
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write_only=False, logger=None, redis_options=None):
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if aioredis is None:
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raise RuntimeError('Redis package is not installed '
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'(Run "pip install redis" in your virtualenv).')
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if not hasattr(aioredis.Redis, 'from_url'):
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raise RuntimeError('Version 2 of aioredis package is required.')
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self.redis_url = url
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self.redis_options = redis_options or {}
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self._redis_connect()
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super().__init__(channel=channel, write_only=write_only, logger=logger)
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def _redis_connect(self):
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self.redis = aioredis.Redis.from_url(self.redis_url,
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**self.redis_options)
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self.pubsub = self.redis.pubsub(ignore_subscribe_messages=True)
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async def _publish(self, data):
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retry = True
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while True:
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try:
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if not retry:
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self._redis_connect()
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return await self.redis.publish(
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self.channel, pickle.dumps(data))
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except RedisError:
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if retry:
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self._get_logger().error('Cannot publish to redis... '
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'retrying')
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retry = False
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else:
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self._get_logger().error('Cannot publish to redis... '
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'giving up')
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break
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async def _redis_listen_with_retries(self):
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retry_sleep = 1
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connect = False
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while True:
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try:
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if connect:
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self._redis_connect()
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await self.pubsub.subscribe(self.channel)
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retry_sleep = 1
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async for message in self.pubsub.listen():
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yield message
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except RedisError:
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self._get_logger().error('Cannot receive from redis... '
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'retrying in '
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'{} secs'.format(retry_sleep))
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connect = True
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await asyncio.sleep(retry_sleep)
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retry_sleep *= 2
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if retry_sleep > 60:
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retry_sleep = 60
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async def _listen(self):
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channel = self.channel.encode('utf-8')
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await self.pubsub.subscribe(self.channel)
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async for message in self._redis_listen_with_retries():
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if message['channel'] == channel and \
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message['type'] == 'message' and 'data' in message:
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yield message['data']
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await self.pubsub.unsubscribe(self.channel)
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