bazarr/libs/socketio/asyncio_redis_manager.py

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2020-01-30 01:07:26 +00:00
import asyncio
import pickle
from urllib.parse import urlparse
try:
import aioredis
except ImportError:
aioredis = None
from .asyncio_pubsub_manager import AsyncPubSubManager
def _parse_redis_url(url):
p = urlparse(url)
if p.scheme not in {'redis', 'rediss'}:
raise ValueError('Invalid redis url')
ssl = p.scheme == 'rediss'
host = p.hostname or 'localhost'
port = p.port or 6379
password = p.password
if p.path:
db = int(p.path[1:])
else:
db = 0
return host, port, password, db, ssl
class AsyncRedisManager(AsyncPubSubManager): # pragma: no cover
"""Redis based client manager for asyncio servers.
This class implements a Redis backend for event sharing across multiple
processes. Only kept here as one more example of how to build a custom
backend, since the kombu backend is perfectly adequate to support a Redis
message queue.
To use a Redis backend, initialize the :class:`Server` instance as
follows::
server = socketio.Server(client_manager=socketio.AsyncRedisManager(
'redis://hostname:port/0'))
:param url: The connection URL for the Redis server. For a default Redis
store running on the same host, use ``redis://``. To use an
SSL connection, use ``rediss://``.
:param channel: The channel name on which the server sends and receives
notifications. Must be the same in all the servers.
:param write_only: If set ot ``True``, only initialize to emit events. The
default of ``False`` initializes the class for emitting
and receiving.
"""
name = 'aioredis'
def __init__(self, url='redis://localhost:6379/0', channel='socketio',
write_only=False, logger=None):
if aioredis is None:
raise RuntimeError('Redis package is not installed '
'(Run "pip install aioredis" in your '
'virtualenv).')
(
self.host, self.port, self.password, self.db, self.ssl
) = _parse_redis_url(url)
self.pub = None
self.sub = None
super().__init__(channel=channel, write_only=write_only, logger=logger)
async def _publish(self, data):
retry = True
while True:
try:
if self.pub is None:
self.pub = await aioredis.create_redis(
(self.host, self.port), db=self.db,
password=self.password, ssl=self.ssl
)
return await self.pub.publish(self.channel,
pickle.dumps(data))
except (aioredis.RedisError, OSError):
if retry:
self._get_logger().error('Cannot publish to redis... '
'retrying')
self.pub = None
retry = False
else:
self._get_logger().error('Cannot publish to redis... '
'giving up')
break
async def _listen(self):
retry_sleep = 1
while True:
try:
if self.sub is None:
self.sub = await aioredis.create_redis(
(self.host, self.port), db=self.db,
password=self.password, ssl=self.ssl
)
self.ch = (await self.sub.subscribe(self.channel))[0]
return await self.ch.get()
except (aioredis.RedisError, OSError):
self._get_logger().error('Cannot receive from redis... '
'retrying in '
'{} secs'.format(retry_sleep))
self.sub = None
await asyncio.sleep(retry_sleep)
retry_sleep *= 2
if retry_sleep > 60:
retry_sleep = 60