how to get tornadoredis listen value - redis

Question

I want to write a chat demo with tornado and redis. I use redis subscribe , but what I wrote is not work . when I run the code , iterm output
listening 8000
GroupChat here
getMsg here
None
None
And I PUBLISH testc helloword in redis-cli, iterm output:
[I 150401 18:30:57 web:1825] 304 GET /groupchat?key=testc (127.0.0.1) 2.40ms
Message(kind=u'message', channel=u'testc', body=u'helloword', pattern=u'testc')
I just want to get the Message in GroupChat.get , but I get None. anyone help me?
GroupChat code is here :
class GroupChat(tornado.web.RequestHandler):
def initialize(self):
print 'GroupChat here'
self.c = tornadoredis.Client(host=CONFIG['REDIS_HOST'], port=CONFIG['REDIS_PORT'], password=CONFIG['REDIS_AUTH'])
self.channelMsgModel = channelMsgModel(self.c)
#tornado.gen.coroutine
def get(self):
try:
key = self.get_argument('key')
info = yield self.channelMsgModel.getMsg(key)
print info
self.finish(info)
except Exception, e:
print e
pass
channelMsgModel code is here :
import tornado.gen
class channelMsgModel :
timeout = 10
def __init__(self, redisobj):
self.redisobj = redisobj
#tornado.gen.coroutine
def getMsg(self, key):
print 'getMsg here'
yield tornado.gen.Task(self.redisobj.subscribe, key)
info = self.redisobj.listen(self.on_message)
print info
raise tornado.gen.Return(info)
def on_message(self, msg):
if (msg.kind == 'message'):
print msg
return msg
elif (msg.kind == 'unsubscribe'):
self.redisobj.disconnect()
# raise tornado.gen.Return(False)

Answer 1

Use a toro.Queue (which will be included in Tornado itself in the upcoming version 4.2):
class channelMsgModel:
def __init__(self, redisobj):
self.redisobj = redisobj
self.queue = toro.Queue()
#gen.coroutine
def getMsg(self, key):
yield gen.Task(self.redisobj.subscribe, key)
self.redisobj.listen(self.on_message)
info = yield self.queue.get()
raise tornado.gen.Return(info)
def on_message(self, msg):
if (msg.kind == 'message'):
self.queue.put_nowait(msg)
elif (msg.kind == 'unsubscribe'):
self.redisobj.disconnect()