Function genericHgetallCommand

app/redis-6.2.6/src/t_hash.c:894–930

}

void genericHgetallCommand(client *c, int flags) {
    robj *o;
    hashTypeIterator *hi;
    int length, count = 0;

    robj *emptyResp = (flags & OBJ_HASH_KEY && flags & OBJ_HASH_VALUE) ?
        shared.emptymap[c->resp] : shared.emptyarray;
    if ((o = lookupKeyReadOrReply(c,c->argv[1],emptyResp))
        == NULL || checkType(c,o,OBJ_HASH)) return;

    /* We return a map if the user requested keys and values, like in the
     * HGETALL case. Otherwise to use a flat array makes more sense. */
    length = hashTypeLength(o);
    if (flags & OBJ_HASH_KEY && flags & OBJ_HASH_VALUE) {
        addReplyMapLen(c, length);
    } else {
        addReplyArrayLen(c, length);
    }

    hi = hashTypeInitIterator(o);
    while (hashTypeNext(hi) != C_ERR) {
        if (flags & OBJ_HASH_KEY) {
            addHashIteratorCursorToReply(c, hi, OBJ_HASH_KEY);
            count++;
        }
        if (flags & OBJ_HASH_VALUE) {
            addHashIteratorCursorToReply(c, hi, OBJ_HASH_VALUE);
            count++;
        }
    }

    hashTypeReleaseIterator(hi);

    /* Make sure we returned the right number of elements. */
    if (flags & OBJ_HASH_KEY && flags & OBJ_HASH_VALUE) count /= 2;
    serverAssert(count == length);
}

void hkeysCommand(client *c) {
    genericHgetallCommand(c,OBJ_HASH_KEY);