Function addReplyPubsubMessage

app/redis-6.2.6/src/pubsub.c:43–51

Send a pubsub message of type "message" to the client. * Normally 'msg' is a Redis object containing the string to send as * message. However if the caller sets 'msg' as NULL, it will be able * to send a special message (for instance an Array type) by using the * addReply*() API family. */

 * to send a special message (for instance an Array type) by using the
 * addReply*() API family. */
void addReplyPubsubMessage(client *c, robj *channel, robj *msg) {
    if (c->resp == 2)
        addReply(c,shared.mbulkhdr[3]);
    else
        addReplyPushLen(c,3);
    addReply(c,shared.messagebulk);
    addReplyBulk(c,channel);
    if (msg) addReplyBulk(c,msg);
}

/* Send a pubsub message of type "pmessage" to the client. The difference
 * with the "message" type delivered by addReplyPubsubMessage() is that