[SOLVED] Is non-blocking Redis pubsub possible?

Is non-blocking Redis pubsub possible?

I want to use redis' pubsub to transmit some messages, but don't want be blocked using listen, like the code below:

import redis
rc = redis.Redis()

ps = rc.pubsub()
ps.subscribe(['foo', 'bar'])

rc.publish('foo', 'hello world')

for item in ps.listen():
    if item['type'] == 'message':
        print item['channel']
        print item['data']

The last for section will block. I just want to check if a given channel has data, how can I accomplish this? Is there a check like method?

Solution

I don't think that would be possible. A Channel doesn't have any "current data", you subscribe to a channel and start receiving messages that are being pushed by other clients on the channel, hence it is a blocking API. Also if you look at the Redis Commands documentation for pub/sub it would make it more clear.