bool IsContractActive(byte[] contractHash)
{
using (var dbTx = _DBContext.GetTransactionContext())
{
return(ActiveContractSet.IsActive(dbTx, contractHash));
}
//TODO: get number of blocks
//var lastBlock = ActiveContractSet.LastBlock(dbTx, contractHash);
//var currentHeight = Tip == null ? 0 : Tip.Value.header.blockNumber;
//return nextBlocks > currentHeight - lastBlock;
}
/// <summary>
/// Handles a new transaction from network or wallet.
/// </summary>
TxResultEnum HandleTransaction(Types.Transaction tx, bool checkInDb = true)
{
using (var dbTx = _DBContext.GetTransactionContext())
{
TransactionValidation.PointedTransaction ptx;
var txHash = Merkle.transactionHasher.Invoke(tx);
lock (memPool)
{
if (memPool.TxPool.Contains(txHash) || memPool.ICTxPool.Contains(txHash) || memPool.OrphanTxPool.Contains(txHash))
{
BlockChainTrace.Information("Tx already in mempool", txHash);
return(TxResultEnum.Known);
}
if (checkInDb && BlockStore.TxStore.ContainsKey(dbTx, txHash) && BlockStore.TxStore.Get(dbTx, txHash).Value.InMainChain)
{
BlockChainTrace.Information("Tx already in store", txHash);
return(TxResultEnum.Known);
}
Action removeDeps = () =>
{
memPool.ICTxPool.GetDependencies(txHash).ToList().ForEach(t => t.Item1.RemoveWithDependencies(t.Item2));
memPool.OrphanTxPool.GetDependencies(txHash).ToList().ForEach(t => t.Item1.RemoveWithDependencies(t.Item2));
};
if (IsDoubleSpend(dbTx, tx, false))
{
new TxMessage(txHash, null, TxStateEnum.Invalid).Publish();
removeDeps();
return(TxResultEnum.DoubleSpend);
}
switch (IsOrphanTx(dbTx, tx, false, out ptx))
{
case IsTxOrphanResult.Orphan:
BlockChainTrace.Information("tx added as orphan", tx);
memPool.OrphanTxPool.Add(txHash, tx);
return(TxResultEnum.Orphan);
case IsTxOrphanResult.Invalid:
BlockChainTrace.Information("tx refers to an output that cannot exist", tx);
removeDeps();
return(TxResultEnum.Invalid);
}
if (IsCoinbaseTx(ptx))
{
BlockChainTrace.Information("tx is coinbase", tx);
return(TxResultEnum.Invalid);
}
if (!IsReferencedCoinbaseTxsValid(dbTx, ptx))
{
BlockChainTrace.Information("referenced coinbase immature", tx);
return(TxResultEnum.Invalid);
}
//if (!IsStructurallyValidTx(dbTx, ptx))
//{
// BlockChainTrace.Information("tx invalid - structural", ptx);
// return TxResultEnum.Invalid;
//}
byte[] contractHash;
switch (IsContractGeneratedTx(ptx, out contractHash))
{
case IsContractGeneratedTxResult.ContractGenerated:
if (!ActiveContractSet.IsActive(dbTx, contractHash))
{
BlockChainTrace.Information("tx added to ICTx mempool", tx);
BlockChainTrace.Information(" of contract", contractHash);
memPool.TxPool.ICTxPool.Add(txHash, ptx);
return(TxResultEnum.InactiveContract);
}
var utxoLookup = UtxoLookupFactory(dbTx, false, ptx);
var contractFunction = ActiveContractSet.GetContractFunction(dbTx, contractHash);
if (!IsValidAutoTx(ptx, utxoLookup, contractHash, contractFunction))
{
BlockChainTrace.Information("auto-tx invalid", ptx);
removeDeps();
return(TxResultEnum.Invalid);
}
break;
case IsContractGeneratedTxResult.Invalid:
BlockChainTrace.Information("tx invalid - input locks", tx);
return(TxResultEnum.Invalid);
case IsContractGeneratedTxResult.NotContractGenerated: // assume user generated
if (!IsValidUserGeneratedTx(dbTx, ptx))
{
BlockChainTrace.Information("tx invalid - input locks", tx);
removeDeps();
return(TxResultEnum.Invalid);
}
break;
}
BlockChainTrace.Information("tx added to mempool", ptx);
memPool.TxPool.Add(txHash, ptx);
new TxMessage(txHash, ptx, TxStateEnum.Unconfirmed).Publish();
new HandleOrphansOfTxAction(txHash).Publish();
}
return(TxResultEnum.Accepted);
}
}