Function srandmemberCommand

app/redis-6.2.6/src/t_set.c:811–835

SRANDMEMBER [ ] */

/* SRANDMEMBER [<count>] */
void srandmemberCommand(client *c) {
    robj *set;
    sds ele;
    int64_t llele;
    int encoding;

    if (c->argc == 3) {
        srandmemberWithCountCommand(c);
        return;
    } else if (c->argc > 3) {
        addReplyErrorObject(c,shared.syntaxerr);
        return;
    }

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

    encoding = setTypeRandomElement(set,&ele,&llele);
    if (encoding == OBJ_ENCODING_INTSET) {
        addReplyBulkLongLong(c,llele);
    } else {
        addReplyBulkCBuffer(c,ele,sdslen(ele));
    }
}

int qsortCompareSetsByCardinality(const void *s1, const void *s2) {
    if (setTypeSize(*(robj**)s1) > setTypeSize(*(robj**)s2)) return 1;