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118 lines
4.5 KiB
118 lines
4.5 KiB
import logging
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import pickle
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import time
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try:
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import redis
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except ImportError:
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redis = None
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from .pubsub_manager import PubSubManager
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logger = logging.getLogger('socketio')
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class RedisManager(PubSubManager): # pragma: no cover
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"""Redis based client manager.
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This class implements a Redis backend for event sharing across multiple
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processes. Only kept here as one more example of how to build a custom
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backend, since the kombu backend is perfectly adequate to support a Redis
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message queue.
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To use a Redis backend, initialize the :class:`Server` instance as
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follows::
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url = 'redis://hostname:port/0'
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server = socketio.Server(client_manager=socketio.RedisManager(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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``Redis.from_url()``.
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"""
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name = 'redis'
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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 redis is None:
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raise RuntimeError('Redis package is not installed '
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'(Run "pip install redis" in your '
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'virtualenv).')
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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(RedisManager, self).__init__(channel=channel,
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write_only=write_only,
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logger=logger)
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def initialize(self):
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super(RedisManager, self).initialize()
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monkey_patched = True
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if self.server.async_mode == 'eventlet':
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from eventlet.patcher import is_monkey_patched
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monkey_patched = is_monkey_patched('socket')
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elif 'gevent' in self.server.async_mode:
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from gevent.monkey import is_module_patched
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monkey_patched = is_module_patched('socket')
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if not monkey_patched:
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raise RuntimeError(
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'Redis requires a monkey patched socket library to work '
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'with ' + self.server.async_mode)
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def _redis_connect(self):
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self.redis = redis.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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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 self.redis.publish(self.channel, pickle.dumps(data))
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except redis.exceptions.RedisError:
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if retry:
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logger.error('Cannot publish to redis... retrying')
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retry = False
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else:
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logger.error('Cannot publish to redis... giving up')
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break
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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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self.pubsub.subscribe(self.channel)
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retry_sleep = 1
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for message in self.pubsub.listen():
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yield message
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except redis.exceptions.RedisError:
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logger.error('Cannot receive from redis... '
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'retrying in {} secs'.format(retry_sleep))
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connect = True
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time.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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def _listen(self):
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channel = self.channel.encode('utf-8')
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self.pubsub.subscribe(self.channel)
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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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self.pubsub.unsubscribe(self.channel)
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