Function scanCallback

src/db.cpp:1097–1124

This callback is used by scanGenericCommand in order to collect elements * returned by the dictionary iterator into a list. */

/* This callback is used by scanGenericCommand in order to collect elements
 * returned by the dictionary iterator into a list. */
void scanCallback(void *privdata, const dictEntry *de) {
    void **pd = (void**) privdata;
    list *keys = (list*)pd[0];
    robj *o = (robj*)pd[1];
    robj *key, *val = NULL;

    if (o == NULL) {
        sds sdskey = (sds)dictGetKey(de);
        key = createStringObject(sdskey, sdslen(sdskey));
    } else if (o->type == OBJ_SET) {
        sds keysds = (sds)dictGetKey(de);
        key = createStringObject(keysds,sdslen(keysds));
    } else if (o->type == OBJ_HASH) {
        sds sdskey = (sds)dictGetKey(de);
        sds sdsval = (sds)dictGetVal(de);
        key = createStringObject(sdskey,sdslen(sdskey));
        val = createStringObject(sdsval,sdslen(sdsval));
    } else if (o->type == OBJ_ZSET) {
        sds sdskey = (sds)dictGetKey(de);
        key = createStringObject(sdskey,sdslen(sdskey));
        val = createStringObjectFromLongDouble(*(double*)dictGetVal(de),0);
    } else {
        serverPanic("Type not handled in SCAN callback.");
    }

    listAddNodeTail(keys, key);
    if (val) listAddNodeTail(keys, val);
}

/* Try to parse a SCAN cursor stored at object 'o':
 * if the cursor is valid, store it as unsigned integer into *cursor and