Function hrandfieldCommand

app/redis-6.2.6/src/t_hash.c:1184–1209

HRANDFIELD key [ [WITHVALUES]] */

/* HRANDFIELD key [<count> [WITHVALUES]] */
void hrandfieldCommand(client *c) {
    long l;
    int withvalues = 0;
    robj *hash;
    ziplistEntry ele;

    if (c->argc >= 3) {
        if (getLongFromObjectOrReply(c,c->argv[2],&l,NULL) != C_OK) return;
        if (c->argc > 4 || (c->argc == 4 && strcasecmp(c->argv[3]->ptr,"withvalues"))) {
            addReplyErrorObject(c,shared.syntaxerr);
            return;
        } else if (c->argc == 4)
            withvalues = 1;
        hrandfieldWithCountCommand(c, l, withvalues);
        return;
    }

    /* Handle variant without <count> argument. Reply with simple bulk string */
    if ((hash = lookupKeyReadOrReply(c,c->argv[1],shared.null[c->resp]))== NULL ||
        checkType(c,hash,OBJ_HASH)) {
        return;
    }

    hashTypeRandomElement(hash,hashTypeLength(hash),&ele,NULL);
    hashReplyFromZiplistEntry(c, &ele);
}