//
// Helper: create two dummy transactions, each with
// two outputs. The first has 11 and 50 CENT outputs
// paid to a TX_PUBKEY, the second 21 and 22 CENT outputs
// paid to a TX_PUBKEYHASH.
//
static std::vector<CMutableTransaction>
SetupDummyInputs(CBasicKeyStore& keystoreRet, CCoinsViewCache& coinsRet)
{
std::vector<CMutableTransaction> dummyTransactions;
dummyTransactions.resize(2);
// Add some keys to the keystore:
CKey key[4];
for (int i = 0; i < 4; i++)
{
key[i].MakeNewKey(i % 2);
keystoreRet.AddKey(key[i]);
}
// Create some dummy input transactions
dummyTransactions[0].vout.resize(2);
dummyTransactions[0].vout[0].nValue = 11*CENT;
dummyTransactions[0].vout[0].scriptPubKey << ToByteVector(key[0].GetPubKey()) << OP_CHECKSIG;
dummyTransactions[0].vout[1].nValue = 50*CENT;
dummyTransactions[0].vout[1].scriptPubKey << ToByteVector(key[1].GetPubKey()) << OP_CHECKSIG;
AddCoins(coinsRet, dummyTransactions[0], 0);
dummyTransactions[1].vout.resize(2);
dummyTransactions[1].vout[0].nValue = 21*CENT;
dummyTransactions[1].vout[0].scriptPubKey = GetScriptForDestination(key[2].GetPubKey().GetID());
dummyTransactions[1].vout[1].nValue = 22*CENT;
dummyTransactions[1].vout[1].scriptPubKey = GetScriptForDestination(key[3].GetPubKey().GetID());
AddCoins(coinsRet, dummyTransactions[1], 0);
return dummyTransactions;
}
/** 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);
}
/**
* Builds a creationTx from scriptPubKey and a spendingTx from scriptSig
* and witness such that spendingTx spends output zero of creationTx.
* Also inserts creationTx's output into the coins view.
*/
void BuildTxs(CMutableTransaction& spendingTx, CCoinsViewCache& coins, CMutableTransaction& creationTx, const CScript& scriptPubKey, const CScript& scriptSig, const CScriptWitness& witness)
{
creationTx.nVersion = 1;
creationTx.vin.resize(1);
creationTx.vin[0].prevout.SetNull();
creationTx.vin[0].scriptSig = CScript();
creationTx.vout.resize(1);
creationTx.vout[0].nValue = 1;
creationTx.vout[0].scriptPubKey = scriptPubKey;
spendingTx.nVersion = 1;
spendingTx.vin.resize(1);
spendingTx.vin[0].prevout.hash = creationTx.GetHash();
spendingTx.vin[0].prevout.n = 0;
spendingTx.vin[0].scriptSig = scriptSig;
spendingTx.vin[0].scriptWitness = witness;
spendingTx.vout.resize(1);
spendingTx.vout[0].nValue = 1;
spendingTx.vout[0].scriptPubKey = CScript();
AddCoins(coins, creationTx, 0);
}
