public OperatingError Add(TransactionReceipt receipt, bool notify = true)
{
if (receipt is null)
{
throw new ArgumentNullException(nameof(receipt));
}
/* don't add to transaction pool transactions with the same hashes */
if (_transactions.ContainsKey(receipt.Hash))
{
return(OperatingError.AlreadyExists);
}
/* verify transaction before adding */
if (GetNextNonceForAddress(receipt.Transaction.From) < receipt.Transaction.Nonce ||
_transactionManager.CalcNextTxNonce(receipt.Transaction.From) > receipt.Transaction.Nonce)
{
return(OperatingError.InvalidNonce);
}
/* special case for system transactions */
if (receipt.Transaction.From.IsZero())
{
// system transaction will not be replaced by same nonce
// do we need to check nonce for system txes???
if (GetNextNonceForAddress(receipt.Transaction.From) != receipt.Transaction.Nonce)
{
return(OperatingError.InvalidNonce);
}
if (!_poolRepository.ContainsTransactionByHash(receipt.Hash))
{
_poolRepository.AddTransaction(receipt);
}
return(OperatingError.Ok);
}
/* check if the address has enough gas */
if (!IsBalanceValid(receipt))
{
return(OperatingError.InsufficientBalance);
}
// Stop accept regular txes 100 blocks before Hardfork_6
if (HardforkHeights.IsHardfork_9Active(BlockHeight() + 100) &&
!HardforkHeights.IsHardfork_9Active(BlockHeight()))
{
if (!receipt.Transaction.To.Equals(ContractRegisterer.GovernanceContract) &&
!receipt.Transaction.To.Equals(ContractRegisterer.StakingContract))
{
return(OperatingError.UnsupportedTransaction);
}
}
// we use next height here because block header should be signed with the same chainId
// and this txes will go to the next block
bool useNewChainId = HardforkHeights.IsHardfork_9Active(BlockHeight() + 1);
var result = _transactionManager.Verify(receipt, useNewChainId);
if (result != OperatingError.Ok)
{
return(result);
}
_transactionVerifier.VerifyTransaction(receipt, useNewChainId);
bool oldTxExist = false;
TransactionReceipt?oldTx = null;
lock (_transactions)
{
if (GetNextNonceForAddress(receipt.Transaction.From) != receipt.Transaction.Nonce)
{
/* this tx will try to replace an old one */
oldTxExist = _transactionHashTracker.TryGetTransactionHash(receipt.Transaction.From,
receipt.Transaction.Nonce, out var oldTxHash);
if (!oldTxExist)
{
Logger.LogWarning($"Max nonce for address {receipt.Transaction.From} is "
+ $"{GetNextNonceForAddress(receipt.Transaction.From)}. But cannot find transaction "
+ $"for nonce {receipt.Transaction.Nonce}");
return(OperatingError.TransactionLost);
}
if (!_transactions.TryGetValue(oldTxHash !, out oldTx))
{
Logger.LogTrace(
$"Transaction {receipt.Hash.ToHex()} cannot replace the old transaction {oldTxHash!.ToHex()}. "
+ $"Probable reason: old transaction is already proposed to block");
return(OperatingError.TransactionLost);
}
if (oldTx.Transaction.GasPrice >= receipt.Transaction.GasPrice)
{
// discard new transaction, it has less gas price than the old one
Logger.LogTrace(
$"Transaction {receipt.Hash.ToHex()} with nonce: {receipt.Transaction.Nonce} and gasPrice: " +
$"{receipt.Transaction.GasPrice} trying to replace transaction {oldTx.Hash.ToHex()} with nonce: " +
$"{oldTx.Transaction.Nonce} and gasPrice: {oldTx.Transaction.GasPrice} but cannot due to lower gasPrice");
return(OperatingError.Underpriced);
}
if (!IdenticalTransaction(oldTx.Transaction, receipt.Transaction))
{
Logger.LogTrace(
$"Transaction {receipt.Hash.ToHex()} with nonce: {receipt.Transaction.Nonce} and gasPrice: " +
$"{receipt.Transaction.GasPrice} trying to replace transaction {oldTx.Hash.ToHex()} with nonce: " +
$"{oldTx.Transaction.Nonce} and gasPrice: {oldTx.Transaction.GasPrice} but cannot due to different value is some fields");
return(OperatingError.DuplicatedTransaction);
}
// remove the old transaction from pool
_transactionsQueue.Remove(oldTx);
_nonceCalculator.TryRemove(oldTx);
_transactions.TryRemove(oldTxHash !, out var _);
Logger.LogTrace(
$"Transaction {oldTxHash!.ToHex()} with nonce: {oldTx.Transaction.Nonce} and gasPrice: {oldTx.Transaction.GasPrice}" +
$" in pool is replaced by transaction {receipt.Hash.ToHex()} with nonce: {receipt.Transaction.Nonce} and gasPrice: " +
$"{receipt.Transaction.GasPrice}");
}
/* put transaction to pool queue */
_transactions[receipt.Hash] = receipt;
_transactionsQueue.Add(receipt);
/* add to the _nonceCalculator to efficiently calculate nonce */
_nonceCalculator.TryAdd(receipt);
}
/* write transaction to persistence storage */
if (!oldTxExist && !_poolRepository.ContainsTransactionByHash(receipt.Hash))
{
_poolRepository.AddTransaction(receipt);
}
else if (oldTxExist)
{
_poolRepository.AddAndRemoveTransaction(receipt, oldTx !);
}
Logger.LogTrace($"Added transaction {receipt.Hash.ToHex()} to pool");
if (notify)
{
TransactionAdded?.Invoke(this, receipt);
}
return(OperatingError.Ok);
}
