Listens for messages published to channels.
SUBSCRIBE
channel
[channel…]
Subscribes the client to the specified channels.
Once the client enters the subscribed state it is not supposed to
issue any other commands, except for additional SUBSCRIBE
,
SSUBSCRIBE
, PSUBSCRIBE
,
UNSUBSCRIBE
, SUNSUBSCRIBE
,
PUNSUBSCRIBE
, PING
, RESET
and
QUIT
commands. However, if RESP3 is used (see
HELLO
) it is possible for a client to issue any commands
while in subscribed state.
Note that RESET
can be called to exit subscribed
state.
For more information, see Pub/sub.
When successful, this command doesn’t return anything. Instead, for
each channel, one message with the first element being the string
subscribe
is pushed as a confirmation that the command
succeeded.
O(N) where N is the number of channels to subscribe to.
@pubsub @slow
PSUBSCRIBE, PUBLISH, PUBSUB, PUBSUB CHANNELS, PUBSUB HELP, PUBSUB NUMPAT, PUBSUB NUMSUB, PUBSUB SHARDCHANNELS, PUBSUB SHARDNUMSUB, PUNSUBSCRIBE, SPUBLISH, SSUBSCRIBE, SUNSUBSCRIBE, UNSUBSCRIBE.