/** Apply the effects of a block on the utxo cache, ignoring that it may already have been applied. */
bool CViewManager::ConnectBlock(const CBlock &block, const CBlockIndex *pIndex, CCoinsViewCache &viewCache)
{
for (const CTransactionRef &tx : block.vtx)
{
if (!tx->IsCoinBase())
{
for (const CTxIn &txin : tx->vin)
{
viewCache.SpendCoin(txin.prevout);
}
}
// Pass check = true as every addition may be an overwrite.
AddCoins(viewCache, *tx, pIndex->nHeight, true);
}
return true;
}
void CViewManager::UpdateCoins(const CTransaction &tx, CCoinsViewCache &inputs, CTxUndo &txundo, int nHeight)
{
// mark inputs spent
if (!tx.IsCoinBase())
{
txundo.vprevout.reserve(tx.vin.size());
for (const CTxIn &txin : tx.vin)
{
txundo.vprevout.emplace_back();
bool is_spent = inputs.SpendCoin(txin.prevout, &txundo.vprevout.back());
assert(is_spent);
}
}
// add outputs
AddCoins(inputs, tx, nHeight);
}
/** Undo the effects of this block (with given index) on the UTXO set represented by coins.
* When FAILED is returned, view is left in an indeterminate state. */
DisconnectResult
CViewManager::DisconnectBlock(const CBlock &block, const CBlockIndex *pindex, CCoinsViewCache &view, bool *pfClean)
{
if (pfClean)
*pfClean = false;
bool fClean = true;
CBlockUndo blockUndo;
CDiskBlockPos pos = pindex->GetUndoPos();
if (pos.IsNull())
{
ELogFormat("no undo data available");
return DISCONNECT_FAILED;
}
if (!UndoReadFromDisk(blockUndo, pos, pindex->pprev->GetBlockHash()))
{
ELogFormat("failure reading undo data");
return DISCONNECT_FAILED;
}
if (blockUndo.vtxundo.size() + 1 != block.vtx.size())
{
ELogFormat("block and undo data inconsistent");
return DISCONNECT_FAILED;
}
// undo transactions in reverse order
for (int i = block.vtx.size() - 1; i >= 0; i--)
{
const CTransaction &tx = *(block.vtx[i]);
uint256 hash = tx.GetHash();
bool is_coinbase = tx.IsCoinBase();
// Check that all outputs are available and match the outputs in the block itself
// exactly.
for (size_t o = 0; o < tx.vout.size(); o++)
{
if (!tx.vout[o].scriptPubKey.IsUnspendable())
{
COutPoint out(hash, o);
Coin coin;
bool is_spent = view.SpendCoin(out, &coin);
if (!is_spent || tx.vout[o] != coin.out || pindex->nHeight != coin.nHeight ||
is_coinbase != coin.fCoinBase)
{
fClean = false; // transaction output mismatch
}
}
}
// restore inputs
if (i > 0)
{ // not coinbases
if(tx.IsCoinBase2()){
continue; //continue
}
CTxUndo &txundo = blockUndo.vtxundo[i - 1];
if (txundo.vprevout.size() != tx.vin.size())
{
ELogFormat("transaction and undo data inconsistent");
return DISCONNECT_FAILED;
}
for (unsigned int j = tx.vin.size(); j-- > 0;)
{
const COutPoint &out = tx.vin[j].prevout;
int res = ApplyTxInUndo(std::move(txundo.vprevout[j]), view, out);
if (res == DISCONNECT_FAILED)
return DISCONNECT_FAILED;
fClean = fClean && res != DISCONNECT_UNCLEAN;
}
// At this point, all of txundo.vprevout should have been moved out.
}
}
// move best block pointer to prevout block
view.SetBestBlock(pindex->pprev->GetBlockHash());
//sbtc-vm
GET_CONTRACT_INTERFACE(ifContractObj);
uint256 hashStateRoot;
uint256 hashUTXORoot;
CBlock prevblock;
if (!ReadBlockFromDisk(prevblock, pindex->pprev, Params().GetConsensus())) {
//TODO LogError
rLogError("ReadBlockFromDisk failed at %d, hash=%s", pindex->pprev->nHeight,
pindex->pprev->GetBlockHash().ToString());
} else {
if(prevblock.GetVMState(hashStateRoot, hashUTXORoot) == RET_VM_STATE_ERR)
{
ILogFormat("GetVMState err");
}
}
ifContractObj->UpdateState(hashStateRoot, hashUTXORoot);
// ifContractObj->UpdateState(pindex->pprev->hashStateRoot, pindex->pprev->hashUTXORoot);
GET_CHAIN_INTERFACE(ifChainObj);
if (pfClean == NULL && ifChainObj->IsLogEvents())
{
ifContractObj->DeleteResults(block.vtx);
ifChainObj->GetBlockTreeDB()->EraseHeightIndex(pindex->nHeight);
}
return fClean ? DISCONNECT_OK : DISCONNECT_UNCLEAN;
}