有没有办法广播到Redis中的每个频道？

Question

I am trying to broadcast the message to channel in redis, but every user have they'r own channel with their user_id.

the way i think can be use is get all active channel and then publish it one by one. because what i know redis can't publish if diferent channel.

but the problem is, in lib go-redis i am using when the user subribe and check the redis with command PUBSUB CAHNNELS there is no channel result. i read on documentation the subribe function not gonna actived thhe channel immidietly. so how can i get the subribe channel ?

is there any solution to solve this ? i am using golang-redis https://godoc.org/github.com/go-redis/redis

Answer 1

Subscribe each connection to the per user channel and and a channel for broadcasts. To send to all users, publish to the broadcast channel. The subscriber code will look something like this with the go-redis client:

sub := client.Subscribe(userChannel, broadcastChannel)
defer sub.Close()
for {
   m, err := sub.ReceiveMessage()
   ... do something with m
}

where userChannel and broadcastChannel are the names of Redis channels. Use code like this to broadcast:

cmd := client.Publish(broadcastChannel, message)
if cmd.Err() != nil {
    // handle error
}