private void RecordTransferHistory(Snapshot snapshot, UInt160 scriptHash, UInt160 from, UInt160 to, BigInteger amount, UInt256 txHash, ref ushort transferIndex)
{
if (!_shouldTrackHistory)
{
return;
}
if (_recordNullAddressHistory || from != UInt160.Zero)
{
_transfersSent.Add(new Nep5TransferKey(from,
snapshot.GetHeader(snapshot.Height).Timestamp, scriptHash, transferIndex),
new Nep5Transfer
{
Amount = amount,
UserScriptHash = to,
BlockIndex = snapshot.Height,
TxHash = txHash
});
}
if (_recordNullAddressHistory || to != UInt160.Zero)
{
_transfersReceived.Add(new Nep5TransferKey(to,
snapshot.GetHeader(snapshot.Height).Timestamp, scriptHash, transferIndex),
new Nep5Transfer
{
Amount = amount,
UserScriptHash = from,
BlockIndex = snapshot.Height,
TxHash = txHash
});
}
transferIndex++;
}
private bool AddClaims(JArray claimableOutput, ref Fixed8 runningTotal, int maxClaims,
Snapshot snapshot, DataCache <UInt256, SpentCoinState> storeSpentCoins,
KeyValuePair <UserSystemAssetCoinOutputsKey, UserSystemAssetCoinOutputs> claimableInTx)
{
foreach (var claimTransaction in claimableInTx.Value.AmountByTxIndex)
{
var utxo = new JObject();
var txId = claimableInTx.Key.TxHash.ToString().Substring(2);
utxo["txid"] = txId;
utxo["n"] = claimTransaction.Key;
var spentCoinState = storeSpentCoins.TryGet(claimableInTx.Key.TxHash);
var startHeight = spentCoinState.TransactionHeight;
var endHeight = spentCoinState.Items[claimTransaction.Key];
CalculateClaimable(snapshot, claimTransaction.Value, startHeight, endHeight, out var generated,
out var sysFee);
var unclaimed = generated + sysFee;
utxo["value"] = (double)(decimal)claimTransaction.Value;
utxo["start_height"] = startHeight;
utxo["end_height"] = endHeight;
utxo["generated"] = (double)(decimal)generated;
utxo["sys_fee"] = (double)(decimal)sysFee;
utxo["unclaimed"] = (double)(decimal)unclaimed;
runningTotal += unclaimed;
claimableOutput.Add(utxo);
if (claimableOutput.Count > maxClaims)
{
return(false);
}
}
return(true);
}
private JObject ProcessGetClaimableSpents(JArray parameters)
{
UInt160 scriptHash = GetScriptHashFromParam(parameters[0].AsString());
var dbCache = new DbCache <UserSystemAssetCoinOutputsKey, UserSystemAssetCoinOutputs>(
_db, null, null, SystemAssetSpentUnclaimedCoinsPrefix);
JObject json = new JObject();
JArray claimable = new JArray();
json["claimable"] = claimable;
json["address"] = scriptHash.ToAddress();
Fixed8 totalUnclaimed = Fixed8.Zero;
using (Snapshot snapshot = Blockchain.Singleton.GetSnapshot())
{
var storeSpentCoins = snapshot.SpentCoins;
byte[] prefix = new [] { (byte)1 }.Concat(scriptHash.ToArray()).ToArray();
foreach (var claimableInTx in dbCache.Find(prefix))
{
if (!AddClaims(claimable, ref totalUnclaimed, _rpcMaxUnspents, snapshot, storeSpentCoins,
claimableInTx))
{
break;
}
}
}
json["unclaimed"] = (double)(decimal)totalUnclaimed;
return(json);
}
private void RecordTransferHistory(Snapshot snapshot, UInt160 scriptHash, UInt160 from, UInt160 to, BigInteger amount, UInt256 txHash, ref ushort transferIndex)
{
Header header = snapshot.GetHeader(snapshot.Height);
JObject transfer = new JObject();
transfer["from"] = from.ToAddress();
transfer["to"] = to.ToAddress();
transfer["time"] = header.Timestamp;
transfer["scripthash"] = scriptHash.ToString();
transfer["amount"] = amount.ToString();
transfer["block"] = snapshot.Height;
transfer["txid"] = txHash.ToString();
transfer["transferindex"] = $"{snapshot.Height}.{transferIndex}";
Document a = Document.FromJson(transfer.ToString());
TransfersTable.UpdateItemAsync(a);
transferIndex++;
// store the asset metadata if this is the first time we're seeing this scripthash
if (Assets.Count == 0)
{
PreloadAssets();
}
if (!Assets.Contains(scriptHash.ToString()))
{
AddAsset(snapshot, scriptHash);
}
}
private void CalculateClaimable(Snapshot snapshot, Fixed8 value, uint startHeight, uint endHeight, out Fixed8 generated, out Fixed8 sysFee)
{
uint amount = 0;
uint ustart = startHeight / Blockchain.DecrementInterval;
if (ustart < Blockchain.GenerationAmount.Length)
{
uint istart = startHeight % Blockchain.DecrementInterval;
uint uend = endHeight / Blockchain.DecrementInterval;
uint iend = endHeight % Blockchain.DecrementInterval;
if (uend >= Blockchain.GenerationAmount.Length)
{
uend = (uint)Blockchain.GenerationAmount.Length;
iend = 0;
}
if (iend == 0)
{
uend--;
iend = Blockchain.DecrementInterval;
}
while (ustart < uend)
{
amount += (Blockchain.DecrementInterval - istart) * Blockchain.GenerationAmount[ustart];
ustart++;
istart = 0;
}
amount += (iend - istart) * Blockchain.GenerationAmount[ustart];
}
Fixed8 fractionalShare = value / 100000000;
generated = fractionalShare * amount;
sysFee = fractionalShare * (GetSysFeeAmountForHeight(snapshot.Blocks, endHeight - 1) -
(startHeight == 0 ? 0 : GetSysFeeAmountForHeight(snapshot.Blocks, startHeight - 1)));
}
public void OnPersist(Snapshot snapshot, IReadOnlyList <Blockchain.ApplicationExecuted> applicationExecutedList)
{
if (snapshot.PersistingBlock.Index > _lastPersistedBlock + 1)
{
ProcessSkippedBlocks(snapshot);
}
_shouldPersistBlock = ProcessBlock(snapshot, snapshot.PersistingBlock);
}
public void OnCommit(Snapshot snapshot)
{
_balances.Commit();
if (_shouldTrackHistory)
{
_transfersSent.Commit();
_transfersReceived.Commit();
}
_db.Write(WriteOptions.Default, _writeBatch);
}
public void OnCommit(Snapshot snapshot)
{
if (!_shouldPersistBlock)
{
return;
}
_userUnspentCoins.Commit();
if (_shouldTrackUnclaimed)
{
_userSpentUnclaimedCoins.Commit();
}
_db.Write(WriteOptions.Default, _writeBatch);
}
public void PreProcess(HttpContext context, string method, JArray _params)
{
if (method == "sendrawtransaction")
{
JObject res = new JObject();
Transaction tx = Transaction.DeserializeFrom(_params[0].AsString().HexToBytes());
Snapshot snapshot = Blockchain.Singleton.GetSnapshot();
MemoryPool MemPool = Blockchain.Singleton.MemPool;
PreVerify(tx, snapshot, MemPool.GetVerifiedTransactions());
}
}
private JObject ProcessGetUnclaimed(JArray parameters)
{
UInt160 scriptHash = GetScriptHashFromParam(parameters[0].AsString());
JObject json = new JObject();
Fixed8 available = Fixed8.Zero;
Fixed8 unavailable = Fixed8.Zero;
var spentsCache = new DbCache <UserSystemAssetCoinOutputsKey, UserSystemAssetCoinOutputs>(
_db, null, null, SystemAssetSpentUnclaimedCoinsPrefix);
var unspentsCache = new DbCache <UserSystemAssetCoinOutputsKey, UserSystemAssetCoinOutputs>(
_db, null, null, SystemAssetUnspentCoinsPrefix);
using (Snapshot snapshot = Blockchain.Singleton.GetSnapshot())
{
var storeSpentCoins = snapshot.SpentCoins;
byte[] prefix = new [] { (byte)1 }.Concat(scriptHash.ToArray()).ToArray();
foreach (var claimableInTx in spentsCache.Find(prefix))
{
var spentCoinState = storeSpentCoins.TryGet(claimableInTx.Key.TxHash);
foreach (var claimTxIndex in claimableInTx.Value.AmountByTxIndex)
{
var startHeight = spentCoinState.TransactionHeight;
var endHeight = spentCoinState.Items[claimTxIndex.Key];
CalculateClaimable(snapshot, claimTxIndex.Value, startHeight, endHeight, out var generated,
out var sysFee);
available += generated + sysFee;
}
}
var transactionsCache = snapshot.Transactions;
foreach (var claimableInTx in unspentsCache.Find(prefix))
{
var transaction = transactionsCache.TryGet(claimableInTx.Key.TxHash);
foreach (var claimTxIndex in claimableInTx.Value.AmountByTxIndex)
{
var startHeight = transaction.BlockIndex;
var endHeight = Blockchain.Singleton.Height;
CalculateClaimable(snapshot, claimTxIndex.Value, startHeight, endHeight,
out var generated,
out var sysFee);
unavailable += generated + sysFee;
}
}
}
json["available"] = (double)(decimal)available;
json["unavailable"] = (double)(decimal)unavailable;
json["unclaimed"] = (double)(decimal)(available + unavailable);
return(json);
}
private void VerifyWitnesses(IVerifiable verifiable, Snapshot snapshot)
{
UInt160[] hashes;
try
{
hashes = verifiable.GetScriptHashesForVerifying(snapshot);
}
catch (InvalidOperationException)
{
throw new RpcException(-500, "InvalidOperationException getting script hashes for verifying");
}
if (hashes.Length != verifiable.Witnesses.Length)
{
throw new RpcException(-500, "Number of script hashes doesn't match number of witnesses");
}
for (int i = 0; i < hashes.Length; i++)
{
byte[] verification = verifiable.Witnesses[i].VerificationScript;
if (verification.Length == 0)
{
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.EmitAppCall(hashes[i].ToArray());
verification = sb.ToArray();
}
}
else
{
if (hashes[i] != verifiable.Witnesses[i].ScriptHash)
{
throw new RpcException(-500, $"Script hash {i} didn't match witness hash {i}");
}
}
using (ApplicationEngine engine = new ApplicationEngine(TriggerType.Verification, verifiable, snapshot, Fixed8.Zero))
{
engine.LoadScript(verification);
engine.LoadScript(verifiable.Witnesses[i].InvocationScript);
engine.Execute();
if (engine.State.HasFlag(VMState.FAULT))
{
throw new RpcException(-500, "VM returned FAULT during verification trigger (invalid signature data)");
}
if (engine.ResultStack.Count != 1 || !engine.ResultStack.Pop().GetBoolean())
{
throw new RpcException(-500, "VM returned false from verification trigger (bad signature)");
}
}
}
}
private void ProcessSkippedBlocks(Snapshot snapshot)
{
for (uint blockIndex = _lastPersistedBlock + 1; blockIndex < snapshot.PersistingBlock.Index; blockIndex++)
{
var skippedBlock = Blockchain.Singleton.Store.GetBlock(blockIndex);
if (skippedBlock.Transactions.Length <= 1)
{
_lastPersistedBlock = skippedBlock.Index;
continue;
}
_shouldPersistBlock = ProcessBlock(snapshot, skippedBlock);
OnCommit(snapshot);
}
}
public void OnCommit(Snapshot snapshot)
{
_balances.Commit(snapshot.Height, EnumDataTpye.nep5);
foreach (var k in _balances.dictionary.Keys)
{
Nep5State nep5State = new Nep5State()
{
Address = k.UserScriptHash, AssetHash = k.AssetScriptHash, Balance = _balances.TryGet(k)?.Balance ?? 0, LastUpdatedBlock = _balances.TryGet(k)?.LastUpdatedBlock ?? snapshot.Height
};
RecordToMongo(nep5State);
}
if (_shouldTrackHistory)
{
_transfersSent.Commit(snapshot.Height, EnumDataTpye.nep5);
_transfersReceived.Commit(snapshot.Height, EnumDataTpye.nep5);
}
_db.Write(WriteOptions.Default, _writeBatch);
}
private void AddAsset(Snapshot snapshot, UInt160 scriptHash)
{
JObject asset = new JObject();
string n = GetAssetString(snapshot, scriptHash, "name");
string s = GetAssetString(snapshot, scriptHash, "symbol");
BigInteger d = GetAssetInteger(snapshot, scriptHash, "decimals");
if (n.Length > 0 && s.Length > 0)
{
ContractState contract = snapshot.Contracts.TryGet(scriptHash);
asset["scripthash"] = scriptHash.ToString();
asset["firstseen"] = snapshot.Height;
asset["name"] = n;
asset["symbol"] = s;
asset["decimals"] = d.ToString();
asset["state"] = contract.ToJson();
}
Document b = Document.FromJson(asset.ToString());
AssetsTable.UpdateItemAsync(b);
Assets.Add(scriptHash.ToString());
}
/*
* private void RefreshContractList(Snapshot snapshot)
* {
* Contracts = new HashSet<string>();
* int idx = 0;
* foreach (KeyValuePair<UInt160, ContractState> dc in snapshot.Contracts.Find())
* {
* Console.WriteLine($"Adding contract {idx}: {dc.Key.ToString()}");
* JObject c = dc.Value.ToJson();
* c["idx"] = idx;
*
* Document b = Document.FromJson(c.ToString());
* ContractsTable.UpdateItemAsync(b);
* Contracts.Add(dc.Key.ToString());
*
* idx++;
* }
* ContractCount = idx;
* }
*/
private void AddNewContracts(Snapshot snapshot)
{
int idx = Contracts.Count;
foreach (KeyValuePair <UInt160, ContractState> dc in snapshot.Contracts.Find())
{
string cs = dc.Key.ToString();
if (!Contracts.Contains(cs))
{
Console.WriteLine($"Adding contract {idx}: {cs}");
JObject c = dc.Value.ToJson();
c["idx"] = idx;
c["block"] = snapshot.Height;
c["time"] = snapshot.PersistingBlock.Timestamp;
Document b = Document.FromJson(c.ToString());
ContractsTable.UpdateItemAsync(b);
Contracts.Add(cs);
idx++;
}
}
}
private void AddBlock(Snapshot snapshot)
{
Block block = snapshot.PersistingBlock;
ulong idx = block.Index;
Console.WriteLine($"Adding block {idx} to DynamoDB table");
ulong blocktime = 0;
if (block.Index > 0)
{
ulong timestamp = block.Timestamp;
Header header = snapshot.GetHeader((uint)idx - 1);
ulong lasttimestamp = header.Timestamp;
blocktime = timestamp - lasttimestamp;
}
JObject j = block.ToJson();
j["blocktime"] = blocktime;
Document d = Document.FromJson(j.ToString());
BlocksTable.UpdateItemAsync(d);
}
public BigInteger GetAssetInteger(Snapshot snapshot, UInt160 scripthash, string operation)
{
byte[] script;
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.EmitAppCall(scripthash, operation,
scripthash.ToArray());
script = sb.ToArray();
}
ApplicationEngine engine = ApplicationEngine.Run(script, snapshot, extraGAS: 100000000);
if (engine.State.HasFlag(VMState.FAULT))
{
return(0);
}
if (engine.ResultStack.Count <= 0)
{
return(0);
}
return(engine.ResultStack.Pop().GetBigInteger());
}
private void PreVerify(Transaction tx, Snapshot snapshot, IEnumerable <Transaction> mempool)
{
if (tx.Size > Transaction.MaxTransactionSize)
{
throw new RpcException(-500, "Size exceeds maximum transaction size");
}
for (int i = 1; i < tx.Inputs.Length; i++)
{
for (int j = 0; j < i; j++)
{
if (tx.Inputs[i].PrevHash == tx.Inputs[j].PrevHash && tx.Inputs[i].PrevIndex == tx.Inputs[j].PrevIndex)
{
throw new RpcException(-500, "Duplicate inputs");
}
}
}
if (mempool.Where(p => p != tx).SelectMany(p => p.Inputs).Intersect(tx.Inputs).Count() > 0)
{
throw new RpcException(-500, "Transaction already in mempool");
}
CheckDoubleSpend(snapshot, tx);
foreach (var group in tx.Outputs.GroupBy(p => p.AssetId))
{
AssetState asset = snapshot.Assets.TryGet(group.Key);
if (asset == null)
{
throw new RpcException(-500, "Asset value is null");
}
if (asset.Expiration <= snapshot.Height + 1 && asset.AssetType != AssetType.GoverningToken && asset.AssetType != AssetType.UtilityToken)
{
throw new RpcException(-500, "Asset registration has expired");
}
foreach (TransactionOutput output in group)
{
if (output.Value.GetData() % (long)Math.Pow(10, 8 - asset.Precision) != 0)
{
throw new RpcException(-500, "Invalid precision for asset output");
}
}
}
TransactionResult[] results = tx.GetTransactionResults()?.ToArray();
if (results == null)
{
throw new RpcException(-500, "No TransactionResults found");
}
TransactionResult[] results_destroy = results.Where(p => p.Amount > Fixed8.Zero).ToArray();
if (results_destroy.Length > 1)
{
throw new RpcException(-500, "TransactionResults destroy length > 1");
}
if (results_destroy.Length == 1 && results_destroy[0].AssetId != Blockchain.UtilityToken.Hash)
{
throw new RpcException(-500, "TransactionResults destroy length equals 1 but asset is not GAS");
}
if (tx.SystemFee > Fixed8.Zero && (results_destroy.Length == 0 || results_destroy[0].Amount < tx.SystemFee))
{
throw new RpcException(-500, "System fee > 0 but TransactionResults destroy length is zero or amount is less than fee");
}
TransactionResult[] results_issue = results.Where(p => p.Amount < Fixed8.Zero).ToArray();
switch (tx.Type)
{
case TransactionType.MinerTransaction:
case TransactionType.ClaimTransaction:
if (results_issue.Any(p => p.AssetId != Blockchain.UtilityToken.Hash))
{
throw new RpcException(-500, "ClaimTransaction but asset is not GAS");
}
break;
case TransactionType.IssueTransaction:
if (results_issue.Any(p => p.AssetId == Blockchain.UtilityToken.Hash))
{
throw new RpcException(-500, "IssueTransaction but asset hash matches GAS");
}
break;
case TransactionType.InvocationTransaction:
InvocationTransaction it = (InvocationTransaction)tx;
if (it.Gas.GetData() % 100000000 != 0)
{
throw new RpcException(-500, "Gas parameter is non-integer");
}
break;
default:
if (results_issue.Length > 0)
{
throw new RpcException(-500, "No assets issued");
}
break;
}
if (tx.Attributes.Count(p => p.Usage == TransactionAttributeUsage.ECDH02 || p.Usage == TransactionAttributeUsage.ECDH03) > 1)
{
throw new RpcException(-500, "Multiple occurances of ECDH02/ECDH03 transaction attribute usages");
}
VerifyWitnesses(tx, snapshot);
}
private void HandleNotification(Snapshot snapshot, Transaction transaction, UInt160 scriptHash,
VM.Types.Array stateItems,
Dictionary <Nep5BalanceKey, Nep5Balance> nep5BalancesChanged, ref ushort transferIndex)
{
if (stateItems.Count == 0)
{
return;
}
// Event name should be encoded as a byte array.
if (!(stateItems[0] is VM.Types.ByteArray))
{
return;
}
var eventName = Encoding.UTF8.GetString(stateItems[0].GetByteArray());
if (eventName != "Transfer")
{
return;
}
if (stateItems.Count < 4)
{
return;
}
if (!(stateItems[1] is null) && !(stateItems[1] is VM.Types.ByteArray))
{
return;
}
if (!(stateItems[2] is null) && !(stateItems[2] is VM.Types.ByteArray))
{
return;
}
var amountItem = stateItems[3];
if (!(amountItem is VM.Types.ByteArray || amountItem is VM.Types.Integer))
{
return;
}
byte[] fromBytes = stateItems[1]?.GetByteArray();
if (fromBytes?.Length != 20)
{
fromBytes = null;
}
byte[] toBytes = stateItems[2]?.GetByteArray();
if (toBytes?.Length != 20)
{
toBytes = null;
}
if (fromBytes == null && toBytes == null)
{
return;
}
var from = new UInt160(fromBytes);
var to = new UInt160(toBytes);
if (fromBytes != null)
{
var fromKey = new Nep5BalanceKey(from, scriptHash);
if (!nep5BalancesChanged.ContainsKey(fromKey))
{
nep5BalancesChanged.Add(fromKey, new Nep5Balance());
}
}
if (toBytes != null)
{
var toKey = new Nep5BalanceKey(to, scriptHash);
if (!nep5BalancesChanged.ContainsKey(toKey))
{
nep5BalancesChanged.Add(toKey, new Nep5Balance());
}
}
RecordTransferHistory(snapshot, scriptHash, from, to, amountItem.GetBigInteger(), transaction.Hash, ref transferIndex);
}
public void OnPersist(Snapshot snapshot, IReadOnlyList <Blockchain.ApplicationExecuted> applicationExecutedList)
{
// Start freshly with a new DBCache for each block.
ResetBatch();
Dictionary <Nep5BalanceKey, Nep5Balance> nep5BalancesChanged = new Dictionary <Nep5BalanceKey, Nep5Balance>();
ushort transferIndex = 0;
foreach (Blockchain.ApplicationExecuted appExecuted in applicationExecutedList)
{
// Executions that fault won't modify storage, so we can skip them.
if (appExecuted.VMState.HasFlag(VMState.FAULT))
{
continue;
}
foreach (var notifyEventArgs in appExecuted.Notifications)
{
if (!(notifyEventArgs?.State is VM.Types.Array stateItems) || stateItems.Count == 0 ||
!(notifyEventArgs.ScriptContainer is Transaction transaction))
{
continue;
}
HandleNotification(snapshot, transaction, notifyEventArgs.ScriptHash, stateItems,
nep5BalancesChanged, ref transferIndex);
}
}
foreach (var nep5BalancePair in nep5BalancesChanged)
{
// get guarantee accurate balances by calling balanceOf for keys that changed.
byte[] script;
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.EmitAppCall(nep5BalancePair.Key.AssetScriptHash, "balanceOf",
nep5BalancePair.Key.UserScriptHash.ToArray());
script = sb.ToArray();
}
ApplicationEngine engine = ApplicationEngine.Run(script, snapshot);
if (engine.State.HasFlag(VMState.FAULT))
{
continue;
}
if (engine.ResultStack.Count <= 0)
{
continue;
}
nep5BalancePair.Value.Balance = engine.ResultStack.Pop().GetBigInteger();
nep5BalancePair.Value.LastUpdatedBlock = snapshot.Height;
if (nep5BalancePair.Value.Balance == 0)
{
_balances.Delete(nep5BalancePair.Key);
continue;
}
var itemToChange = _balances.GetAndChange(nep5BalancePair.Key, () => nep5BalancePair.Value);
if (itemToChange != nep5BalancePair.Value)
{
itemToChange.FromReplica(nep5BalancePair.Value);
}
}
}
private void HandleNotification(Snapshot snapshot, Transaction transaction, UInt160 scriptHash,
VM.Types.Array stateItems,
Dictionary <Nep5BalanceKey, Nep5Balance> nep5BalancesChanged, ref ushort transferIndex)
{
if (stateItems.Count == 0)
{
return;
}
// Event name should be encoded as a byte array.
if (!(stateItems[0] is VM.Types.ByteArray))
{
return;
}
var eventName = Encoding.UTF8.GetString(stateItems[0].GetByteArray());
if (_shouldTrackNonStandardMintTokensEvent && eventName == "mintTokens")
{
if (stateItems.Count < 4)
{
return;
}
// This is not an official standard but at least one token uses it, and so it is needed for proper
// balance tracking to support all tokens in use.
if (!(stateItems[2] is VM.Types.ByteArray))
{
return;
}
byte[] mintToBytes = stateItems[2].GetByteArray();
if (mintToBytes.Length != 20)
{
return;
}
var mintTo = new UInt160(mintToBytes);
var mintAmountItem = stateItems[3];
if (!(mintAmountItem is VM.Types.ByteArray || mintAmountItem is VM.Types.Integer))
{
return;
}
var toKey = new Nep5BalanceKey(mintTo, scriptHash);
if (!nep5BalancesChanged.ContainsKey(toKey))
{
nep5BalancesChanged.Add(toKey, new Nep5Balance());
}
RecordTransferHistory(snapshot, scriptHash, UInt160.Zero, mintTo, mintAmountItem.GetBigInteger(), transaction.Hash, ref transferIndex);
return;
}
if (eventName != "transfer")
{
return;
}
if (stateItems.Count < 4)
{
return;
}
if (!(stateItems[1] is null) && !(stateItems[1] is VM.Types.ByteArray))
{
return;
}
if (!(stateItems[2] is null) && !(stateItems[2] is VM.Types.ByteArray))
{
return;
}
var amountItem = stateItems[3];
if (!(amountItem is VM.Types.ByteArray || amountItem is VM.Types.Integer))
{
return;
}
byte[] fromBytes = stateItems[1]?.GetByteArray();
if (fromBytes?.Length != 20)
{
fromBytes = null;
}
byte[] toBytes = stateItems[2]?.GetByteArray();
if (toBytes?.Length != 20)
{
toBytes = null;
}
if (fromBytes == null && toBytes == null)
{
return;
}
var from = new UInt160(fromBytes);
var to = new UInt160(toBytes);
if (fromBytes != null)
{
var fromKey = new Nep5BalanceKey(from, scriptHash);
if (!nep5BalancesChanged.ContainsKey(fromKey))
{
nep5BalancesChanged.Add(fromKey, new Nep5Balance());
}
}
if (toBytes != null)
{
var toKey = new Nep5BalanceKey(to, scriptHash);
if (!nep5BalancesChanged.ContainsKey(toKey))
{
nep5BalancesChanged.Add(toKey, new Nep5Balance());
}
}
RecordTransferHistory(snapshot, scriptHash, from, to, amountItem.GetBigInteger(), transaction.Hash, ref transferIndex);
}
private void HandleNotification(Snapshot snapshot, Transaction transaction, UInt160 scriptHash,
VM.Types.Array stateItems,
Dictionary <Nep5BalanceKey, Nep5Balance> nep5BalancesChanged, ref ushort transferIndex)
{
// Event name should be encoded as a byte array.
if (!(stateItems[0] is VM.Types.ByteArray))
{
return;
}
var eventName = Encoding.UTF8.GetString(stateItems[0].GetByteArray());
// Only care about transfers
if (eventName != "transfer")
{
return;
}
if (!(stateItems[1] is VM.Types.ByteArray))
{
return;
}
if (!(stateItems[2] is VM.Types.ByteArray))
{
return;
}
var amountItem = stateItems[3];
if (!(amountItem is VM.Types.ByteArray || amountItem is VM.Types.Integer))
{
return;
}
byte[] fromBytes = stateItems[1].GetByteArray();
if (fromBytes.Length != 20)
{
fromBytes = null;
}
byte[] toBytes = stateItems[2].GetByteArray();
if (toBytes.Length != 20)
{
toBytes = null;
}
if (fromBytes == null && toBytes == null)
{
return;
}
var from = new UInt160(fromBytes);
var to = new UInt160(toBytes);
var fromKey = new Nep5BalanceKey(from, scriptHash);
if (!nep5BalancesChanged.ContainsKey(fromKey))
{
nep5BalancesChanged.Add(fromKey, new Nep5Balance());
}
var toKey = new Nep5BalanceKey(to, scriptHash);
if (!nep5BalancesChanged.ContainsKey(toKey))
{
nep5BalancesChanged.Add(toKey, new Nep5Balance());
}
if (!_shouldTrackHistory)
{
return;
}
BigInteger amount = amountItem.GetBigInteger();
_transfersSent.Add(new Nep5TransferKey(from,
snapshot.GetHeader(snapshot.Height).Timestamp, scriptHash, transferIndex),
new Nep5Transfer
{
Amount = amount,
UserScriptHash = to,
BlockIndex = snapshot.Height,
TxHash = transaction.Hash
});
_transfersReceived.Add(new Nep5TransferKey(to,
snapshot.GetHeader(snapshot.Height).Timestamp, scriptHash, transferIndex),
new Nep5Transfer
{
Amount = amount,
UserScriptHash = from,
BlockIndex = snapshot.Height,
TxHash = transaction.Hash
});
transferIndex++;
}
public void OnPersist(Snapshot snapshot, IReadOnlyList <Blockchain.ApplicationExecuted> applicationExecutedList)
{
initDatabase();
Dictionary <Nep5BalanceKey, Nep5Balance> nep5BalancesChanged = new Dictionary <Nep5BalanceKey, Nep5Balance>();
ushort transferIndex = 0;
foreach (var appExec in applicationExecutedList)
{
// Add transaction to DynamoDB
AddTransaction(appExec.Transaction, snapshot.PersistingBlock.Timestamp, snapshot.Height);
// Extract transfer notifications and executed contracts
if (!appExec.VMState.HasFlag(VMState.FAULT))
{
foreach (var notifyEventArgs in appExec.Notifications)
{
if (!(notifyEventArgs?.State is VM.Types.Array stateItems) || stateItems.Count == 0 ||
!(notifyEventArgs.ScriptContainer is Transaction transaction))
{
continue;
}
HandleNotification(snapshot, transaction, notifyEventArgs.ScriptHash, stateItems,
nep5BalancesChanged, ref transferIndex);
}
}
// Add application log to DynamoDB
JObject json = new JObject();
json["txid"] = appExec.Transaction?.Hash.ToString();
json["trigger"] = appExec.Trigger.ToString();
json["vmstate"] = appExec.VMState.ToString();
json["gas_consumed"] = appExec.GasConsumed.ToString();
try
{
json["stack"] = appExec.Stack.Select(q => q.ToParameter().ToJson()).ToArray();
}
catch (InvalidOperationException)
{
json["stack"] = "error: recursive reference";
}
json["notifications"] = appExec.Notifications.Select(q =>
{
JObject notification = new JObject();
notification["contract"] = q.ScriptHash.ToString();
try
{
notification["state"] = q.State.ToParameter().ToJson();
}
catch (InvalidOperationException)
{
notification["state"] = "error: recursive reference";
}
return(notification);
}).ToArray();
string n = json.ToString();
Document a = Document.FromJson(n);
if (json["txid"] != null)
{
ApplicationLogsTable.UpdateItemAsync(a);
}
if (Contracts.Count == 0)
{
PreloadContracts();
}
int newCount = snapshot.Contracts.Find().Count();
if (newCount != Contracts.Count)
{
Console.WriteLine($"contract count: snapshot:{newCount} != memory:{Contracts.Count}");
AddNewContracts(snapshot);
}
}
// process all balance changes
foreach (var nep5BalancePair in nep5BalancesChanged)
{
// get guaranteed-accurate balances by calling balanceOf for keys that changed.
byte[] script;
using (ScriptBuilder sb = new ScriptBuilder())
{
sb.EmitAppCall(nep5BalancePair.Key.AssetScriptHash, "balanceOf",
nep5BalancePair.Key.UserScriptHash.ToArray());
script = sb.ToArray();
}
ApplicationEngine engine = ApplicationEngine.Run(script, snapshot, extraGAS: 100000000);
if (engine.State.HasFlag(VMState.FAULT))
{
continue;
}
if (engine.ResultStack.Count <= 0)
{
continue;
}
nep5BalancePair.Value.Balance = engine.ResultStack.Pop().GetBigInteger();
nep5BalancePair.Value.LastUpdatedBlock = snapshot.Height;
JObject balance = new JObject();
balance["address"] = nep5BalancePair.Key.UserScriptHash.ToAddress();
balance["asset"] = nep5BalancePair.Key.AssetScriptHash.ToString();
balance["balance"] = nep5BalancePair.Value.Balance.ToString();
balance["lastupdatedblock"] = nep5BalancePair.Value.LastUpdatedBlock;
Document a = Document.FromJson(balance.ToString());
AddressesTable.UpdateItemAsync(a);
}
}
private bool ProcessBlock(Snapshot snapshot, Block block)
{
if (block.Transactions.Length <= 1)
{
_lastPersistedBlock = block.Index;
return(false);
}
ResetBatch();
var transactionsCache = snapshot.Transactions;
foreach (Transaction tx in block.Transactions)
{
ushort outputIndex = 0;
foreach (TransactionOutput output in tx.Outputs)
{
bool isGoverningToken = output.AssetId.Equals(Blockchain.GoverningToken.Hash);
if (isGoverningToken || output.AssetId.Equals(Blockchain.UtilityToken.Hash))
{
// Add new unspent UTXOs by account script hash.
UserSystemAssetCoinOutputs outputs = _userUnspentCoins.GetAndChange(
new UserSystemAssetCoinOutputsKey(isGoverningToken, output.ScriptHash, tx.Hash),
() => new UserSystemAssetCoinOutputs());
outputs.AddTxIndex(outputIndex, output.Value);
}
outputIndex++;
}
// Iterate all input Transactions by grouping by common input hashes.
foreach (var group in tx.Inputs.GroupBy(p => p.PrevHash))
{
TransactionState txPrev = transactionsCache[group.Key];
// For each input being spent by this transaction.
foreach (CoinReference input in group)
{
// Get the output from the the previous transaction that is now being spent.
var outPrev = txPrev.Transaction.Outputs[input.PrevIndex];
bool isGoverningToken = outPrev.AssetId.Equals(Blockchain.GoverningToken.Hash);
if (isGoverningToken || outPrev.AssetId.Equals(Blockchain.UtilityToken.Hash))
{
// Remove spent UTXOs for unspent outputs by account script hash.
var userCoinOutputsKey =
new UserSystemAssetCoinOutputsKey(isGoverningToken, outPrev.ScriptHash, input.PrevHash);
UserSystemAssetCoinOutputs outputs = _userUnspentCoins.GetAndChange(
userCoinOutputsKey, () => new UserSystemAssetCoinOutputs());
outputs.RemoveTxIndex(input.PrevIndex);
if (outputs.AmountByTxIndex.Count == 0)
{
_userUnspentCoins.Delete(userCoinOutputsKey);
}
if (_shouldTrackUnclaimed && isGoverningToken)
{
UserSystemAssetCoinOutputs spentUnclaimedOutputs = _userSpentUnclaimedCoins.GetAndChange(
userCoinOutputsKey, () => new UserSystemAssetCoinOutputs());
spentUnclaimedOutputs.AddTxIndex(input.PrevIndex, outPrev.Value);
}
}
}
}
if (_shouldTrackUnclaimed && tx is ClaimTransaction claimTransaction)
{
foreach (CoinReference input in claimTransaction.Claims)
{
TransactionState txPrev = transactionsCache[input.PrevHash];
var outPrev = txPrev.Transaction.Outputs[input.PrevIndex];
var claimedCoinKey =
new UserSystemAssetCoinOutputsKey(true, outPrev.ScriptHash, input.PrevHash);
UserSystemAssetCoinOutputs spentUnclaimedOutputs = _userSpentUnclaimedCoins.GetAndChange(
claimedCoinKey, () => new UserSystemAssetCoinOutputs());
spentUnclaimedOutputs.RemoveTxIndex(input.PrevIndex);
if (spentUnclaimedOutputs.AmountByTxIndex.Count == 0)
{
_userSpentUnclaimedCoins.Delete(claimedCoinKey);
}
if (snapshot.SpentCoins.TryGet(input.PrevHash)?.Items.Remove(input.PrevIndex) == true)
{
snapshot.SpentCoins.GetAndChange(input.PrevHash);
}
}
}
}
// Write the current height into the key of the prefix itself
_writeBatch.Put(SystemAssetUnspentCoinsPrefix, block.Index);
_lastPersistedBlock = block.Index;
return(true);
}
public void OnCommit(Snapshot snapshot)
{
AddBlock(snapshot);
}
public IEnumerable <ECPoint> GetValidators(IEnumerable <Transaction> others)
{
Snapshot snapshot = Clone();
foreach (Transaction tx in others)
{
foreach (TransactionOutput output in tx.Outputs)
{
AccountState account = snapshot.Accounts.GetAndChange(output.ScriptHash, () => new AccountState(output.ScriptHash));
if (account.Balances.ContainsKey(output.AssetId))
{
account.Balances[output.AssetId] += output.Value;
}
else
{
account.Balances[output.AssetId] = output.Value;
}
if (output.AssetId.Equals(Blockchain.GoverningToken.Hash) && account.Votes.Length > 0)
{
foreach (ECPoint pubkey in account.Votes)
{
snapshot.Validators.GetAndChange(pubkey, () => new ValidatorState(pubkey)).Votes += output.Value;
}
snapshot.ValidatorsCount.GetAndChange().Votes[account.Votes.Length - 1] += output.Value;
}
}
foreach (var group in tx.Inputs.GroupBy(p => p.PrevHash))
{
Transaction tx_prev = snapshot.GetTransaction(group.Key);
foreach (CoinReference input in group)
{
TransactionOutput out_prev = tx_prev.Outputs[input.PrevIndex];
AccountState account = snapshot.Accounts.GetAndChange(out_prev.ScriptHash);
if (out_prev.AssetId.Equals(Blockchain.GoverningToken.Hash))
{
if (account.Votes.Length > 0)
{
foreach (ECPoint pubkey in account.Votes)
{
ValidatorState validator = snapshot.Validators.GetAndChange(pubkey);
validator.Votes -= out_prev.Value;
if (!validator.Registered && validator.Votes.Equals(Fixed8.Zero))
{
snapshot.Validators.Delete(pubkey);
}
}
snapshot.ValidatorsCount.GetAndChange().Votes[account.Votes.Length - 1] -= out_prev.Value;
}
}
account.Balances[out_prev.AssetId] -= out_prev.Value;
}
}
switch (tx)
{
#pragma warning disable CS0612
case EnrollmentTransaction tx_enrollment:
snapshot.Validators.GetAndChange(tx_enrollment.PublicKey, () => new ValidatorState(tx_enrollment.PublicKey)).Registered = true;
break;
#pragma warning restore CS0612
case StateTransaction tx_state:
foreach (StateDescriptor descriptor in tx_state.Descriptors)
{
switch (descriptor.Type)
{
case StateType.Account:
Blockchain.ProcessAccountStateDescriptor(descriptor, snapshot);
break;
case StateType.Validator:
Blockchain.ProcessValidatorStateDescriptor(descriptor, snapshot);
break;
}
}
break;
}
}
int count = (int)snapshot.ValidatorsCount.Get().Votes.Select((p, i) => new
{
Count = i,
Votes = p
}).Where(p => p.Votes > Fixed8.Zero).ToArray().WeightedFilter(0.25, 0.75, p => p.Votes.GetData(), (p, w) => new
{
p.Count,
Weight = w
}).WeightedAverage(p => p.Count, p => p.Weight);
count = Math.Max(count, Blockchain.StandbyValidators.Length);
HashSet <ECPoint> sv = new HashSet <ECPoint>(Blockchain.StandbyValidators);
ECPoint[] pubkeys = snapshot.Validators.Find().Select(p => p.Value).Where(p => (p.Registered && p.Votes > Fixed8.Zero) || sv.Contains(p.PublicKey)).OrderByDescending(p => p.Votes).ThenBy(p => p.PublicKey).Select(p => p.PublicKey).Take(count).ToArray();
IEnumerable <ECPoint> result;
if (pubkeys.Length == count)
{
result = pubkeys;
}
else
{
HashSet <ECPoint> hashSet = new HashSet <ECPoint>(pubkeys);
for (int i = 0; i < Blockchain.StandbyValidators.Length && hashSet.Count < count; i++)
{
hashSet.Add(Blockchain.StandbyValidators[i]);
}
result = hashSet;
}
return(result.OrderBy(p => p));
}
