CODEWITHSUNDEEP
redispublish-subscribe
luin
luin

Reputation: 1985

How to issue "subscribe" command after entered the "pub/sub" mode?

I can't find any way to subscribe other channels after entered the "pub/sub" mode when using the redis-cli. For example:

$ redis-cli
redis> SUBSCRIBE channel:1
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "channel:1"
3) (integer) 1

When I press Ctrl-C, the redis-cli is quit instead of "pub/sub" mode. Does anyone know how to solve the problem?

Upvotes: 5

Views: 8058

Answers (3)

ch271828n
ch271828n

Reputation: 17567

It is the problem of redis-cli, not Redis.

Redis says that we are allowed to issue SUBSCRIBEs after issuing one SUBSCRIBE. However, the redis-cli will block everything.

Thus, as suggested by @user1611552, we can use 

telnet localhost 6379

instead of redis-cli, and everything would be fine.

Upvotes: 0

user1611552
user1611552

Reputation: 621

Actually, SUBSCRIBE and PSUBSCRIBE will both block all subsequent commands, thus you can't ship any order to the server but cast your eager gaze back to wait your interested channel for the incoming message. Well, This ridiculous behavior makes my head spin also. However, if you try to access redis by means of telnet telnet localhost 6379 instead of redis-cli. Everything will be OK. check it out plz.

Upvotes: 3

Linus Thiel
Linus Thiel

Reputation: 39223

AFAIK, you can't issue new commands in redis-cli after subscribing to a channel. However, the SUBSCRIBE command is variadic since version 2.4, meaning you can pass several channels at once, to subscribe to:

redis 127.0.0.1:6379> SUBSCRIBE channel:1 channel:2
Reading messages... (press Ctrl-C to quit)
1) "subscribe"
2) "channel:1"
3) (integer) 1
1) "subscribe"
2) "channel:2"
3) (integer) 2

Upvotes: 4

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