Function ComputeUTXOStats

src/kernel/coinstats.cpp:111–153

//! Calculate statistics about the unspent transaction output set
template <typename T>
static std::optional<CCoinsStats> ComputeUTXOStats(T hash_obj, CCoinsView* view, node::BlockManager& blockman, const std::function<void()>& interruption_point)
{
    std::unique_ptr<CCoinsViewCursor> pcursor;
    CBlockIndex* pindex;
    {
        LOCK(::cs_main);
        pcursor = view->Cursor();
        pindex = blockman.LookupBlockIndex(pcursor->GetBestBlock());
    }
    assert(pcursor);
    CCoinsStats stats{Assert(pindex)->nHeight, pindex->GetBlockHash()};

    Txid prevkey;
    std::map<uint32_t, Coin> outputs;
    while (pcursor->Valid()) {
        if (interruption_point) interruption_point();
        COutPoint key;
        Coin coin;
        if (pcursor->GetKey(key) && pcursor->GetValue(coin)) {
            if (!outputs.empty() && key.hash != prevkey) {
                ApplyStats(stats, outputs);
                ApplyHash(hash_obj, prevkey, outputs);
                outputs.clear();
            }
            prevkey = key.hash;
            outputs[key.n] = std::move(coin);
            stats.coins_count++;
        } else {
            LogError("%s: unable to read value\n", __func__);
            return std::nullopt;
        }
        pcursor->Next();
    }
    if (!outputs.empty()) {
        ApplyStats(stats, outputs);
        ApplyHash(hash_obj, prevkey, outputs);
    }

    FinalizeHash(hash_obj, stats);

    stats.nDiskSize = view->EstimateSize();
    return stats;
}

std::optional<CCoinsStats> ComputeUTXOStats(CoinStatsHashType hash_type, CCoinsView* view, node::BlockManager& blockman, const std::function<void()>& interruption_point)
{