Python -- Redis 发布订阅
参考博客:http://www.runoob.com/redis/redis-pub-sub.html
一、前言
Redis 发布订阅(pub/sub)是一种消息通信模式:发送者(pub)发送消息,订阅者(sub)接收消息。
Redis 客户端可以订阅任意数量的频道。
下图展示了频道 channel1 , 以及订阅这个频道的三个客户端 —— client2 、 client5 和 client1 之间的关系:
当有新消息通过 PUBLISH 命令发送给频道 channel1 时, 这个消息就会被发送给订阅它的三个客户端:
二、事例
Demo:
import redis class RedisHelper: def __init__(self): self.__conn = redis.Redis(host='172.16.200.49') self.chan_sub = 'fm104.5' self.chan_pub = 'fm104.5' def public(self, msg): self.__conn.publish(self.chan_pub, msg) return True def subscribe(self): pub = self.__conn.pubsub() pub.subscribe(self.chan_sub) pub.parse_response() return pub
订阅者:
# -*- coding: UTF-8 -*- from redis_helper import RedisHelper obj = RedisHelper() redis_sub = obj.subscribe() while True: msg = redis_sub.parse_response() print(msg)
发布者:
# -*- coding: UTF-8 -*- from redis_helper import RedisHelper obj = RedisHelper() while True: msg = input('>>:') obj.public(msg)