Block and transaction position

txpos.cpp

Value BlockPositionToJSON(const uint256& hash)
{
    CTransaction tx;
    uint256 hashBlock = 0;
    if (!GetTransaction(hash, tx, hashBlock, true))
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No information available about transaction");

    int nHeight = 0;
    int nPosition = -1;

    if (hashBlock != 0) {
        map<uint256, CBlockIndex*>::iterator mi = mapBlockIndex.find(hashBlock);
        if (mi != mapBlockIndex.end() && (*mi).second) {
            CBlockIndex* pindex = (*mi).second;
            if (chainActive.Contains(pindex))
                nHeight = pindex->nHeight;
            else
                nHeight = -1;

            CBlock block;
            if (ReadBlockFromDisk(block, pindex))
                nPosition = std::find(block.vtx.begin(), block.vtx.end(), tx) - block.vtx.begin();
        }
    }

    Object result;
    result.push_back(Pair("txid", hash.GetHex()));
    result.push_back(Pair("blockhash", hashBlock.GetHex()));
    result.push_back(Pair("blockheight", nHeight));
    result.push_back(Pair("position", nPosition));

    return result;
}

Value TxPositionToJSON(const uint256& hash)
{
    CDiskTxPos position;          
    int nFile = -1;
    unsigned int nPos = 0;
    unsigned int nTxOffset = 0;

    if (pblocktree->ReadTxIndex(hash, position)) {
        nTxOffset = position.nTxOffset;
        nFile = position.nFile;
        nPos = position.nPos;
    }

    Object result;
    result.push_back(Pair("txid", hash.GetHex()));
    result.push_back(Pair("nFile", nFile));
    result.push_back(Pair("nPos", (uint64_t)nPos));
    result.push_back(Pair("nTxOffset", (uint64_t)nTxOffset));
    
    return result;
}