}; //TODO
public static bool Execute(out Types.Transaction transaction, ContractArgs contractArgs, bool isWitness)
{
try
{
var fileName = HttpServerUtility.UrlTokenEncode(contractArgs.ContractHash);
var contractCode = File.ReadAllText(Path.Combine(_OutputPath, Path.ChangeExtension(fileName, ".fs")));
var func = ContractExamples.Execution.compileQuotedContract(contractCode);
var result = func.Invoke(new Tuple <byte[], byte[], FSharpFunc <Types.Outpoint, FSharpOption <Types.Output> > >(
contractArgs.Message,
contractArgs.ContractHash,
FSharpFunc <Types.Outpoint, FSharpOption <Types.Output> > .FromConverter(t => contractArgs.tryFindUTXOFunc(t))));
var txSkeleton = result as Tuple <FSharpList <Types.Outpoint>, FSharpList <Types.Output>, byte[]>;
transaction = txSkeleton == null || txSkeleton.Item2.Count() == 0 ? null :
new Types.Transaction(
Tests.tx.version,
txSkeleton.Item1,
ListModule.OfSeq <byte[]>(isWitness ? new byte[][] { contractArgs.Message } : new byte[][] { }),
txSkeleton.Item2,
FSharpOption <Types.ExtendedContract> .None //TODO: get from txSkeleton.Item3
);
return(true);
}
catch (Exception e)
{
BlockChainTrace.Error("Error executing contract", e);
}
transaction = null;
return(false);
}
public static IsContractGeneratedTxResult IsContractGeneratedTx(TransactionValidation.PointedTransaction ptx, out byte[] contractHash)
{
contractHash = null;
foreach (var input in ptx.pInputs)
{
if ([email protected])
{
if (contractHash == null)
{
contractHash = ((Types.OutputLock.ContractLock)input.Item2.@lock).contractHash;
}
else if (!contractHash.SequenceEqual(((Types.OutputLock.ContractLock)input.Item2.@lock).contractHash))
{
return(IsContractGeneratedTxResult.Invalid);
}
else if (!contractHash.SequenceEqual(((Types.OutputLock.ContractLock)input.Item2.@lock).contractHash))
{
BlockChainTrace.Information("Unexpected contactHash", contractHash);
return(IsContractGeneratedTxResult.Invalid);
}
}
}
return(contractHash == null ? IsContractGeneratedTxResult.NotContractGenerated : IsContractGeneratedTxResult.ContractGenerated);
}
public void ShouldEvictWithDependencies()
{
var key = Key.Create();
var tx = Utils
.GetTx().AddOutput(Key.Create().Address, Consensus.Tests.zhash, 100)
.Sign(key.Private).Tag("tx");
var tx1 = Utils.GetTx().AddInput(tx, 0).AddOutput(Key.Create().Address, Consensus.Tests.zhash, 1).Sign(key.Private).Tag("tx1");
var tx2 = Utils.GetTx().AddInput(tx, 0).AddOutput(Key.Create().Address, Consensus.Tests.zhash, 2).Sign(key.Private).Tag("tx2");
var contractHash = new byte[] { };
BlockChainTrace.SetTag(contractHash, "mock contract");
_BlockChain.memPool.ContractPool.AddRef(tx1.Key(), new ACSItem()
{
Hash = contractHash
});
HandleBlock(_GenesisBlock.AddTx(tx).Tag("genesis"));
Assert.That(TxState(tx), Is.EqualTo(TxStateEnum.Confirmed));
HandleBlock(_GenesisBlock.Child().AddTx(tx1).Tag("main"));
Assert.That(TxState(tx1), Is.EqualTo(TxStateEnum.Confirmed));
var branch = _GenesisBlock.Child().Tag("branch");
HandleBlock(branch.Child().Tag("branch orphan"));
HandleBlock(branch.AddTx(tx2).Tag("branch child"));
System.Threading.Thread.Sleep(1000);
Assert.That(TxState(tx2), Is.EqualTo(TxStateEnum.Confirmed));
Assert.That(TxState(tx1), Is.EqualTo(TxStateEnum.Invalid));
Assert.That(_BlockChain.memPool.TxPool.ContainsKey(tx1.Key()), Is.False);
}
// remove
bool IsTransactionValid(Types.Transaction tx, byte[] txHash, out TransactionValidation.PointedTransaction ptx)
{
if (_BlockChain.BlockStore.TxStore.ContainsKey(_DbTx, txHash) && _BlockChain.BlockStore.TxStore.Get(_DbTx, txHash).Value.InMainChain)
{
BlockChainTrace.Information("Tx already in store", txHash);
ptx = null;
return(false);
}
switch (_BlockChain.IsOrphanTx(_DbTx, tx, true, out ptx))
{
case BlockChain.IsTxOrphanResult.Orphan:
BlockChainTrace.Information("tx invalid - orphan", tx);
return(false);
case BlockChain.IsTxOrphanResult.Invalid:
BlockChainTrace.Information("tx invalid - reference(s)", tx);
return(false);
}
if (_BlockChain.IsDoubleSpend(_DbTx, tx, true))
{
return(false);
}
//TODO: coinbase validation + check that witness has blocknumber
if (!BlockChain.IsValidUserGeneratedTx(_DbTx, ptx))
{
BlockChainTrace.Information("tx invalid - structural", ptx);
return(false);
}
byte[] contractHash;
switch (BlockChain.IsContractGeneratedTx(ptx, out contractHash))
{
case BlockChain.IsContractGeneratedTxResult.ContractGenerated:
if (!_BlockChain.ActiveContractSet.IsActive(_DbTx, contractHash))
{
BlockChainTrace.Information("tx invalid - contract not active", tx);
return(false);
}
var contractFunction = _BlockChain.ActiveContractSet.GetContractFunction(_DbTx, contractHash);
if (!BlockChain.IsValidAutoTx(ptx, UtxoLookup, contractHash, contractFunction))
{
BlockChainTrace.Information("auto-tx invalid", ptx);
return(false);
}
break;
case BlockChain.IsContractGeneratedTxResult.Invalid:
BlockChainTrace.Information("tx invalid - input locks", tx);
return(false);
}
return(true);
}
void UndoBlock(Types.Block block, byte[] key)
{
BlockChainTrace.Information($"undoing block {block.header.blockNumber}", block);
_BlockChain.BlockStore.SetLocation(_DbTx, key, LocationEnum.Branch);
var blockUndoData = _BlockChain.BlockStore.GetUndoData(_DbTx, key);
if (blockUndoData != null)
{
blockUndoData.AddedUTXO.ForEach(u =>
{
BlockChainTrace.Information($"undo block {block.header.blockNumber}: utxo removed, amount {u.Item2.spend.amount}", block);
_BlockChain.UTXOStore.Remove(_DbTx, u.Item1.txHash, u.Item1.index);
});
blockUndoData.RemovedUTXO.ForEach(u =>
{
BlockChainTrace.Information($"undo block {block.header.blockNumber}: new utxo, amount {u.Item2.spend.amount}", block);
_BlockChain.UTXOStore.Put(_DbTx, u.Item1.txHash, u.Item1.index, u.Item2);
});
foreach (var item in blockUndoData.ACSDeltas)
{
if (item.Value.LastBlock.HasValue) // restore last block - undo extend
{
var current = new ActiveContractSet().Get(_DbTx, item.Key);
if (current != null)
{
current.Value.LastBlock = item.Value.LastBlock.Value;
_BlockChain.ActiveContractSet.Add(_DbTx, current.Value);
}
else
{
BlockChainTrace.Error("missing ACS item!", new Exception());
}
}
else if (item.Value.ACSItem != null) // restore entire item - undo expire
{
_BlockChain.ActiveContractSet.Add(_DbTx, item.Value.ACSItem);
}
else // remove item - undo activate
{
_BlockChain.ActiveContractSet.Remove(_DbTx, item.Key);
}
}
}
block.transactions.ToList().ForEach(tx =>
{
var txHash = Merkle.transactionHasher.Invoke(tx);
UnconfirmedTxs[txHash] = tx;
});
}
public ContractFunction GetContractFunction(TransactionContext dbTx, byte[] contractHash)
{
var acsItem = Get(dbTx, contractHash);
if (acsItem == null)
{
return(null);
}
var deserialization = FSharpOption <Tuple <ContractFunction, ContractCostFunction> > .None;
try
{
deserialization = ContractExamples.FStarExecution.deserialize(acsItem.Value.Serialized);
}
catch
{
BlockChainTrace.Information("Error deserializing contract");
}
if (FSharpOption <Tuple <ContractFunction, ContractCostFunction> > .get_IsNone(deserialization) || deserialization == null)
{
BlockChainTrace.Information("Reserializing contract");
try
{
var compilation = ContractExamples.FStarExecution.compile(acsItem.Value.Extracted);
if (FSharpOption <byte[]> .get_IsNone(compilation))
{
return(null);
}
acsItem.Value.Serialized = compilation.Value;
Add(dbTx, acsItem.Value);
deserialization = ContractExamples.FStarExecution.deserialize(compilation.Value);
if (FSharpOption <Tuple <ContractFunction, ContractCostFunction> > .get_IsNone(deserialization))
{
BlockChainTrace.Error("Error deserializing contract");
return(null);
}
}
catch (Exception e)
{
BlockChainTrace.Error("Error recompiling contract", e);
return(null);
}
}
return(deserialization.Value.Item1);
}
// Note: when contract uses blokchain state as context, need to pass it in.
public static bool ExecuteContract(
byte[] contractHash,
ContractFunction contractFunction,
byte[] message,
out Types.Transaction transaction,
UtxoLookup UtxoLookup,
bool isWitness)
{
var contractFunctionInput = new ContractFunctionInput(
message,
contractHash,
UtxoLookup
);
TransactionSkeleton transactionSkeleton = null;
transaction = null;
try
{
var serializer = new ContractExamples.FStarCompatibility.DataSerializer(Consensus.Serialization.context);
Consensus.Serialization.context.Serializers.RegisterOverride(serializer);
var result = contractFunction.Invoke(contractFunctionInput);
if (result.IsError)
{
BlockChainTrace.Information("Contract resulted in error: " + result.ErrorValue);
return(false);
}
transactionSkeleton = result.ResultValue;
}
catch (Exception e)
{
BlockChainTrace.Error("Error executing contract", e);
return(false);
}
if (transactionSkeleton == null)
{
return(false);
}
transaction = new Types.Transaction(
Tests.tx.version,
transactionSkeleton.Item1,
ListModule.OfSeq(isWitness ? new byte[][] { message } : new byte[][] { }),
transactionSkeleton.Item2,
FSharpOption <Types.ExtendedContract> .None //TODO: get from txSkeleton.Item3
);
return(true);
}
bool IsValidTimeStamp()
{
//TODO: assert block's timestamp isn't too far in the future
var result = _Bk.header.timestamp >= _BlockChain.Timestamps.Median();
if (!result)
{
BlockChainTrace.Information($"block {_Bk.header.blockNumber} has invalid timestamp", _BkHash);
}
return(result);
}
bool IsValidBlockNumber()
{
var parentBlock = GetBlock(_Bk.header.parent).Value;
#if TRACE
if (parentBlock.header.blockNumber >= _Bk.header.blockNumber)
{
BlockChainTrace.Information($"block {_Bk.header.blockNumber}: expecting block-number greater than {parentBlock.header.blockNumber}, found {_Bk.header.blockNumber}", _BkHash);
}
#endif
return(parentBlock.header.blockNumber < _Bk.header.blockNumber);
}
public static bool Compile_old(String fsharpCode, out byte[] contractHash)
{
var tempSourceFile = Path.ChangeExtension(Path.GetTempFileName(), ".fs");
var process = new Process();
contractHash = GetHash(fsharpCode);
File.WriteAllText(tempSourceFile, fsharpCode);
if (!Directory.Exists(_OutputPath))
{
Directory.CreateDirectory(_OutputPath);
}
if (IsRunningOnMono())
{
process.StartInfo.FileName = "fsharpc";
process.StartInfo.Arguments = $"-o { GetFileName(contractHash) } -a {tempSourceFile}{DEPENCENCY_OPTION + string.Join(DEPENCENCY_OPTION, _Dependencies)}";
}
else
{
//TODO
}
process.OutputDataReceived += (sender, args1) =>
{
Console.WriteLine("## " + args1.Data);
};
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardOutput = true;
process.OutputDataReceived += (sender, args1) =>
{
BlockChainTrace.Information(args1.Data);
};
try
{
process.Start();
process.BeginOutputReadLine();
process.WaitForExit();
}
catch (Exception e)
{
BlockChainTrace.Error("process", e);
}
File.Delete(tempSourceFile);
return(process.ExitCode == 0);
}
public static bool IsValidAutoTx(TransactionValidation.PointedTransaction ptx, UtxoLookup UtxoLookup, byte[] contractHash, ContractFunction contractFunction)
{
var isWitness = false;
var witnessIdx = -1;
byte[] message = null;
for (var i = 0; i < ptx.witnesses.Length; i++)
{
if (ptx.witnesses[i].Length > 0)
{
witnessIdx = i;
}
}
if (witnessIdx == 0)
{
message = ptx.witnesses[0];
}
else if (witnessIdx == -1)
{
var contractLock = ptx.pInputs[0].Item2.@lock as Types.OutputLock.ContractLock;
if (contractLock == null)
{
BlockChainTrace.Information("expected ContractLock, tx invalid");
return(false);
}
message = contractLock.data;
}
isWitness = witnessIdx == 0;
Types.Transaction tx;
var isExecutionSuccessful = ExecuteContract(
contractHash,
contractFunction,
message,
out tx,
UtxoLookup,
isWitness
);
return(isExecutionSuccessful && tx != null && TransactionValidation.unpoint(ptx).Equals(tx));
}
public bool TryActivate(TransactionContext dbTx, string contractCode, ulong kalapas, byte[] contractHash, uint blockNumber)
{
if (IsActive(dbTx, contractHash))
{
return(false);
}
//TODO: module name
var extration = ContractExamples.FStarExecution.extract(contractCode);
if (FSharpOption <string> .get_IsNone(extration))
{
BlockChainTrace.Information("Could not extract contract");
return(false);
}
var compilation = ContractExamples.FStarExecution.compile(extration.Value);
if (FSharpOption <byte[]> .get_IsNone(compilation))
{
BlockChainTrace.Information("Could not complie contract");
return(false);
}
var kalapasPerBlock = KalapasPerBlock(contractCode);
if (kalapas < kalapasPerBlock)
{
return(false);
}
var blocks = Convert.ToUInt32(kalapas / kalapasPerBlock);
Add(dbTx, new ACSItem()
{
Hash = contractHash,
KalapasPerBlock = kalapasPerBlock,
LastBlock = blockNumber + blocks,
Extracted = extration.Value,
Serialized = compilation.Value
});
BlockChainTrace.Information($"Contract activated for {blocks} blocks", contractHash);
return(true);
}
void Reorg()
{
var originalTip = _BlockChain.Tip;
Keyed <Types.Block> fork = null;
var newMainChain = GetNewMainChainStartFromForkToLeaf(new Keyed <Types.Block>(_BkHash, _Bk), out fork);
_BlockChain.ChainTip.Context(_DbTx).Value = fork.Key;
_BlockChain.Tip = fork;
_BlockChain.InitBlockTimestamps(_DbTx);
var oldMainChain = GetOldMainChainStartFromLeafToFork(fork, originalTip.Key);
foreach (var block in oldMainChain)
{
UndoBlock(block.Value, block.Key);
}
//append new chain
foreach (var _bk in newMainChain)
{
var action = new BlockVerificationHelper(
_BlockChain,
_DbTx,
_bk.Key,
_bk.Value,
false,
true,
ConfirmedTxs,
UnconfirmedTxs,
QueueActions);
BlockChainTrace.Information($"new main chain bk {_bk.Value.header.blockNumber} {action.Result.BkResultEnum}", _bk.Value);
if (action.Result.BkResultEnum == BkResultEnum.Rejected)
{
_BlockChain.ChainTip.Context(_DbTx).Value = originalTip.Key;
_BlockChain.Tip = originalTip;
_BlockChain.InitBlockTimestamps(_DbTx);
BlockChainTrace.Information("reorganization undo", _bk.Value);
Result = new BkResult(BkResultEnum.Rejected);
return;
}
}
}
public BlockChain(string dbName, byte[] genesisBlockHash)
{
memPool = new MemPool();
UTXOStore = new UTXOStore();
ActiveContractSet = new ActiveContractSet();
BlockStore = new BlockStore();
BlockNumberDifficulties = new BlockNumberDifficulties();
ChainTip = new ChainTip();
Timestamps = new BlockTimestamps();
GenesisBlockHash = genesisBlockHash;
_DBContext = new DBContext(dbName);
OwnResource(_DBContext);
//var listener = new EventLoopMessageListener<QueueAction>(HandleQueueAction, "BlockChain listener");
//OwnResource(MessageProducer<QueueAction>.Instance.AddMessageListener(listener));
var buffer = new BufferBlock <QueueAction>();
QueueAction.Target = buffer;
using (var dbTx = _DBContext.GetTransactionContext())
{
var chainTip = ChainTip.Context(dbTx).Value;
//TODO: check if makred as main?
Tip = chainTip == null ? null : BlockStore.GetBlock(dbTx, chainTip);
if (Tip != null)
{
BlockChainTrace.Information("Tip's block number is " + Tip.Value.header.blockNumber);
//Try to validate orphans of tip, if any. this would be the case when a sync action was interrupted
BlockStore.Orphans(dbTx, Tip.Key).ToList().ForEach(t => new HandleBlockAction(t.Key, t.Value, true).Publish());
}
else
{
BlockChainTrace.Information("No tip.");
}
InitBlockTimestamps(dbTx);
}
var consumer = ConsumeAsync(buffer);
}
void RemoveInvalidAutoTxs(TransactionContext dbTx)
{
foreach (var item in memPool.TxPool.ToList())
{
var ptx = item.Value;
byte[] contractHash;
if (IsContractGeneratedTx(ptx, out contractHash) == IsContractGeneratedTxResult.ContractGenerated)
{
var utxoLookup = UtxoLookupFactory(dbTx, false, ptx);
var contractFunction = ActiveContractSet.GetContractFunction(dbTx, contractHash);
if (!IsValidAutoTx(ptx, utxoLookup, contractHash, contractFunction))
{
BlockChainTrace.Information("invalid auto-tx removed from mempool", item.Value);
memPool.TxPool.RemoveWithDependencies(item.Key);
}
}
}
}
//TODO: should asset that the block came from main?
Types.Block GetBlock(byte[] key)
{
using (TransactionContext context = _DBContext.GetTransactionContext())
{
var location = BlockStore.GetLocation(context, key);
if (location == LocationEnum.Main)
{
try
{
var bk = BlockStore.GetBlock(context, key);
return(bk == null ? null : bk.Value);
} catch (Exception e)
{
BlockChainTrace.Error("GetBlock", e);
return(null);
}
}
return(null);
}
}
public static bool Compile(String csharpCode, out byte[] contractHash)
{
var provider = new CSharpCodeProvider();
var parameters = new CompilerParameters();
foreach (var dependency in _Dependencies)
{
parameters.ReferencedAssemblies.Add(dependency);
}
if (!Directory.Exists(_OutputPath))
{
Directory.CreateDirectory(_OutputPath);
}
contractHash = GetHash(csharpCode);
parameters.GenerateInMemory = false;
parameters.GenerateExecutable = false;
parameters.OutputAssembly = GetFileName(contractHash);
var results = provider.CompileAssemblyFromSource(parameters, csharpCode);
if (results.Errors.HasErrors)
{
StringBuilder sb = new StringBuilder();
foreach (CompilerError error in results.Errors)
{
sb.AppendLine(String.Format("Error ({0}): {1}", error.ErrorNumber, error.ErrorText));
}
BlockChainTrace.Error(sb.ToString(), new Exception());
//throw new InvalidOperationException(sb.ToString());
return(false);
}
return(true);
}
public void ShouldRemoveConfirmedFromMempoolWithDependencies()
{
var key = Key.Create();
var tx = Utils
.GetTx().AddOutput(Key.Create().Address, Consensus.Tests.zhash, 100)
.Sign(key.Private).Tag("tx");
var mempoolTx = Utils.GetTx().AddInput(tx, 0).AddOutput(Key.Create().Address, Consensus.Tests.zhash, 1).Sign(key.Private)
.Tag("mempoolTx");
var contractHash = new byte[] { };
BlockChainTrace.SetTag(contractHash, "mock contract");
HandleBlock(_GenesisBlock.AddTx(tx).Tag("genesis"));
HandleTransaction(mempoolTx);
_BlockChain.memPool.ContractPool.AddRef(mempoolTx.Key(), new ACSItem()
{
Hash = contractHash
});
Assert.That(_BlockChain.memPool.TxPool.Count, Is.EqualTo(1));
Assert.That(_BlockChain.memPool.ContractPool.Count, Is.EqualTo(1));
HandleBlock(_GenesisBlock.Child().AddTx(mempoolTx).Tag("genesis"));
Assert.That(_BlockChain.memPool.TxPool.Count, Is.EqualTo(0));
Assert.That(_BlockChain.memPool.ContractPool.Count, Is.EqualTo(0));
}
public static bool Execute_old(out Types.Transaction transaction, ContractArgs contractArgs, bool isWitness)
{
try
{
var assembly = Assembly.LoadFrom(GetFileName(contractArgs.ContractHash));
var module = assembly.GetModules()[0];
var type = module.GetTypes()[0];
//**************************************************
// used for CSharp based contract debugging
var matchedTypes = Assembly.GetEntryAssembly()
.GetModules()[0]
.GetTypes()
.Where(t => t.FullName == type.FullName);
if (matchedTypes.Any())
{
type = matchedTypes.First();
}
//**************************************************
// used for FSharp based contract debugging
//var matchedTypes = Assembly.LoadFile("TestFSharpContracts.dll")
// .GetModules()[0]
// .GetTypes()
// .Where(t => t.FullName == type.FullName);
//if (matchedTypes.Any())
//{
// type = matchedTypes.First();
//}
var method = type.GetMethod("main");
var args = new object[] {
#if CSHARP_CONTRACTS
new List <byte>(contractArgs.Message),
contractArgs.ContractHash,
contractArgs.tryFindUTXOFunc,
#else
contractArgs.Message,
contractArgs.ContractHash,
FSharpFunc <Types.Outpoint, FSharpOption <Types.Output> > .FromConverter(t => contractArgs.tryFindUTXOFunc(t))
#endif
};
var result = method.Invoke(null, args);
#if CSHARP_CONTRACTS
var txSkeleton = result as Tuple <IEnumerable <Types.Outpoint>, IEnumerable <Types.Output>, byte[]>;
#else
var txSkeleton = result as Tuple <FSharpList <Types.Outpoint>, FSharpList <Types.Output>, byte[]>;
#endif
transaction = txSkeleton == null || txSkeleton.Item2.Count() == 0 ? null :
new Types.Transaction(
Tests.tx.version,
#if CSHARP_CONTRACTS
ListModule.OfSeq(txSkeleton.Item1),
#else
txSkeleton.Item1,
#endif
ListModule.OfSeq <byte[]>(isWitness ? new byte[][] { contractArgs.Message } : new byte[][] { }),
#if CSHARP_CONTRACTS
ListModule.OfSeq(txSkeleton.Item2),
#else
txSkeleton.Item2,
#endif
FSharpOption <Types.ExtendedContract> .None //TODO: get from txSkeleton.Item3
);
return(true);
}
catch (Exception e)
{
BlockChainTrace.Error("Error executing contract", e);
}
transaction = null;
return(false);
}
public BlockVerificationHelper(
BlockChain blockChain,
TransactionContext dbTx,
byte[] bkHash,
Types.Block bk,
bool handleOrphan = false,
bool handleBranch = false,
HashDictionary <TransactionValidation.PointedTransaction> confirmedTxs = null,
HashDictionary <Types.Transaction> invalidatedTxs = null,
List <QueueAction> queuedActions = null
)
{
ConfirmedTxs = confirmedTxs ?? new HashDictionary <TransactionValidation.PointedTransaction>();
UnconfirmedTxs = invalidatedTxs ?? new HashDictionary <Types.Transaction>(); //todo: refactor to set as new obj by default
QueueActions = queuedActions ?? new List <QueueAction>();
_BlockChain = blockChain;
_DbTx = dbTx;
_BkHash = bkHash;
_Bk = bk;
if (!IsValid())
{
BlockChainTrace.Information($"block {_Bk.header.blockNumber} is invalid", _Bk);
Result = new BkResult(BkResultEnum.Rejected);
return;
}
if (IsInStore())
{
var reject = false;
byte[] missingParent = null;
var location = blockChain.BlockStore.GetLocation(dbTx, bkHash);
switch (location)
{
case LocationEnum.Branch:
reject = !handleBranch;
break;
case LocationEnum.Orphans:
missingParent = GetMissingParent();
reject = !handleOrphan && !handleBranch;
break;
default:
reject = true;
break;
}
if (reject)
{
BlockChainTrace.Information($"Block {_Bk.header.blockNumber} already in store ({location})", bk);
Result = new BkResult(BkResultEnum.Rejected, missingParent);
return;
}
}
if (bk.transactions.Count() == 0)
{
BlockChainTrace.Information("empty tx list", bk);
Result = new BkResult(BkResultEnum.Rejected);
return;
}
if (!IsValidTime())
{
BlockChainTrace.Information("invalid time", bk);
Result = new BkResult(BkResultEnum.Rejected);
return;
}
//TODO:
/*
* 3. Transaction list must be non - empty
* 4. Block hash must satisfy claimed nBits proof of work
* 5. Block timestamp must not be more than two hours in the future
* 6. First transaction must be coinbase, the rest must not be
* 7. For each transaction, apply "tx" checks 2 - 4
* 8. (omitted)
* 9. (omitted)
* 10. Verify Merkle hash
*/
if (IsGenesis())
{
if (!IsGenesisValid())
{
BlockChainTrace.Information("invalid genesis block", bk);
Result = new BkResult(BkResultEnum.Rejected);
return;
}
else
{
blockChain.Timestamps.Init(bk.header.timestamp);
ExtendMain(QueueActions, 0, true);
Result = new BkResult(BkResultEnum.Accepted);
BlockChainTrace.Information("accepted genesis block", bk);
return;
}
}
if (IsOrphan())
{
var missingParent = GetMissingParent();
blockChain.BlockStore.Put(dbTx, bkHash, bk, LocationEnum.Orphans, 0);
BlockChainTrace.Information($"block {_Bk.header.blockNumber} added as orphan", bk);
Result = new BkResult(BkResultEnum.AcceptedOrphan, missingParent);
return;
}
//12. Check that nBits value matches the difficulty rules
if (!IsValidDifficulty() || !IsValidBlockNumber() || !IsValidTimeStamp())
{
BlockChainTrace.Information($"block {_Bk.header.blockNumber} rejected", bk);
Result = new BkResult(BkResultEnum.Rejected);
return;
}
//14. For certain old blocks(i.e.on initial block download) check that hash matches known values
var totalWork = TotalWork();
UtxoLookup = _BlockChain.UtxoLookupFactory(_DbTx, true);
if (handleBranch) // make a branch block main
{
if (!ExtendMain(QueueActions, totalWork))
{
Result = new BkResult(BkResultEnum.Rejected);
return;
}
}
else if (!IsNewGreatestWork(totalWork))
{
blockChain.BlockStore.Put(dbTx, bkHash, bk, LocationEnum.Branch, totalWork);
}
else if (blockChain.BlockStore.IsLocation(dbTx, bk.header.parent, LocationEnum.Main))
{
if (!ExtendMain(QueueActions, totalWork))
{
BlockChainTrace.Information($"block {_Bk.header.blockNumber} rejected", bk);
Result = new BkResult(BkResultEnum.Rejected);
return;
}
}
else
{
BlockChainTrace.Information($"block {bk.header.blockNumber} extends a branch with new difficulty", bk);
Reorg();
}
BlockChainTrace.Information($"block {bk.header.blockNumber} accepted", bk);
Result = new BkResult(BkResultEnum.Accepted);
}
public static Types.Block Tag(this Types.Block block, string value)
{
BlockChainTrace.SetTag(block, value);
return(block);
}
public static Types.Transaction Tag(this Types.Transaction tx, string value)
{
BlockChainTrace.SetTag(tx, value);
return(tx);
}
bool ExtendMain(List <QueueAction> queuedActions, double totalWork, bool isGenesis = false)
{
if (_BlockChain.BlockStore.ContainsKey(_DbTx, _BkHash))
{
_BlockChain.BlockStore.SetLocation(_DbTx, _BkHash, LocationEnum.Main);
}
else
{
_BlockChain.BlockStore.Put(_DbTx, _BkHash, _Bk, LocationEnum.Main, totalWork);
}
_BlockChain.Timestamps.Push(_Bk.header.timestamp);
if (_Bk.header.blockNumber % 2000 == 0)
{
_BlockChain.BlockNumberDifficulties.Add(_DbTx.Transaction, _Bk.header.blockNumber, _BkHash);
}
var blockUndoData = new BlockUndoData();
var confirmedTxs = new HashDictionary <TransactionValidation.PointedTransaction>();
//TODO: lock with mempool
for (var txIdx = 0; txIdx < _Bk.transactions.Count(); txIdx++)
{
var tx = _Bk.transactions[txIdx];
var txHash = Merkle.transactionHasher.Invoke(tx);
TransactionValidation.PointedTransaction ptx;
if (!isGenesis)
{
if ((txIdx == 0 && !IsCoinbaseTxValid(tx)) || (txIdx > 0 && IsCoinbaseTxValid(tx)))
{
if (txIdx == 0)
{
BlockChainTrace.Information("Invalid coinbase tx");
}
else
{
BlockChainTrace.Information($"Invalid tx ({txIdx})");
}
return(false);
}
if (!IsTransactionValid(tx, txHash, out ptx))
{
return(false);
}
confirmedTxs[txHash] = ptx;
foreach (var pInput in ptx.pInputs)
{
_BlockChain.UTXOStore.Remove(_DbTx, pInput.Item1);
BlockChainTrace.Information($"utxo spent, amount {pInput.Item2.spend.amount}", ptx);
//BlockChainTrace.Information($" of", pInput.Item1.txHash);
blockUndoData.RemovedUTXO.Add(new Tuple <Types.Outpoint, Types.Output>(pInput.Item1, pInput.Item2));
}
}
else
{
ptx = TransactionValidation.toPointedTransaction(
tx,
ListModule.Empty <Types.Output>()
);
}
_BlockChain.BlockStore.TxStore.Put(_DbTx, txHash, tx, true);
var contractExtendSacrifices = new HashDictionary <ulong>();
var activationSacrifice = 0UL;
for (var outputIdx = 0; outputIdx < tx.outputs.Count(); outputIdx++)
{
var output = tx.outputs[outputIdx];
if ([email protected])
{
if (!output.spend.asset.SequenceEqual(Tests.zhash))
{
continue; // not Zen
}
var contractSacrificeLock = (Types.OutputLock.ContractSacrificeLock)output.@lock;
if (contractSacrificeLock.IsHighVLock)
{
continue; // not current version
}
if (contractSacrificeLock.Item.lockData.Length > 0 && contractSacrificeLock.Item.lockData[0] != null && contractSacrificeLock.Item.lockData[0].Length > 0)
{
var contractKey = contractSacrificeLock.Item.lockData[0]; // output-lock-level indicated contract
contractExtendSacrifices[contractKey] =
(contractExtendSacrifices.ContainsKey(contractKey) ? contractExtendSacrifices[contractKey] : 0) +
output.spend.amount;
}
else if (contractSacrificeLock.Item.lockData.Length == 0)
{
activationSacrifice += output.spend.amount;
}
}
//todo: fix to exclude CSLocks&FLocks, instead of including by locktype
if ([email protected] || [email protected])
{
BlockChainTrace.Information($"new utxo, amount {output.spend.amount}", tx);
var outpoint = new Types.Outpoint(txHash, (uint)outputIdx);
_BlockChain.UTXOStore.Put(_DbTx, outpoint, output);
blockUndoData.AddedUTXO.Add(new Tuple <Types.Outpoint, Types.Output>(outpoint, output));
}
}
if (FSharpOption <Types.ExtendedContract> .get_IsSome(tx.contract) && !tx.contract.Value.IsHighVContract)
{
var codeBytes = ((Types.ExtendedContract.Contract)tx.contract.Value).Item.code;
var contractHash = Merkle.innerHash(codeBytes);
var contractCode = System.Text.Encoding.ASCII.GetString(codeBytes);
if (_BlockChain.ActiveContractSet.TryActivate(_DbTx, contractCode, activationSacrifice, contractHash, _Bk.header.blockNumber))
{
blockUndoData.ACSDeltas.Add(contractHash, new ACSUndoData());
ContractsTxsStore.Add(_DbTx.Transaction, contractHash, txHash);
}
}
foreach (var item in contractExtendSacrifices)
{
var currentACSItem = _BlockChain.ActiveContractSet.Get(_DbTx, item.Key);
if (currentACSItem.Value != null)
{
if (_BlockChain.ActiveContractSet.TryExtend(_DbTx, item.Key, item.Value))
{
if (!blockUndoData.ACSDeltas.ContainsKey(item.Key))
{
blockUndoData.ACSDeltas.Add(item.Key, new ACSUndoData()
{
LastBlock = currentACSItem.Value.LastBlock
});
}
}
}
}
}
var expiringContracts = _BlockChain.ActiveContractSet.GetExpiringList(_DbTx, _Bk.header.blockNumber);
foreach (var acsItem in expiringContracts)
{
if (!blockUndoData.ACSDeltas.ContainsKey(acsItem.Key))
{
blockUndoData.ACSDeltas.Add(acsItem.Key, new ACSUndoData()
{
ACSItem = acsItem.Value
});
}
}
if (!isGenesis)
{
_BlockChain.BlockStore.SetUndoData(_DbTx, _BkHash, blockUndoData);
}
_BlockChain.ActiveContractSet.DeactivateContracts(_DbTx, expiringContracts.Select(t => t.Key));
ValidateACS();
_BlockChain.ChainTip.Context(_DbTx).Value = _BkHash;
//TODO: only update after commit
_BlockChain.Tip = new Keyed <Types.Block>(_BkHash, _Bk);
queuedActions.Add(new MessageAction(new BlockMessage(confirmedTxs, _Bk.header.blockNumber)));
foreach (var item in confirmedTxs)
{
ConfirmedTxs[item.Key] = item.Value;
UnconfirmedTxs.Remove(item.Key);
}
return(true);
}
//void HandleQueueAction(QueueAction action)
async Task ConsumeAsync(ISourceBlock <QueueAction> source)
{
while (await source.OutputAvailableAsync())
{
var action = source.Receive();
try
{
//((dynamic)this).Handle((dynamic)action);
if (action is HandleBlockAction)
{
((HandleBlockAction)action).SetResult(HandleBlock(action as HandleBlockAction));
}
else if (action is GetActiveContractsAction)
{
((GetActiveContractsAction)action).SetResult(GetActiveContracts());
}
else if (action is GetContractPointedOutputsAction)
{
((GetContractPointedOutputsAction)action).SetResult(GetContractPointedOutputs(
((GetContractPointedOutputsAction)action).ContractHash));
}
else if (action is HandleOrphansOfTxAction)
{
HandleOrphansOfTransaction(action as HandleOrphansOfTxAction);
}
else if (action is GetIsContractActiveAction)
{
((GetIsContractActiveAction)action).SetResult(IsContractActive(
((GetIsContractActiveAction)action).ContractHash));
}
//else if (action is GetUTXOAction)
//((GetUTXOAction)action).SetResult(GetUTXO(((GetUTXOAction)action).Outpoint, ((GetUTXOAction)action).IsInBlock));
else if (action is GetIsConfirmedUTXOExistAction)
{
var outpoint = ((GetIsConfirmedUTXOExistAction)action).Outpoint;
((GetIsConfirmedUTXOExistAction)action).SetResult(IsConfirmedUTXOExist(outpoint));
}
else if (action is GetContractCodeAction)
{
((GetContractCodeAction)action).SetResult(GetContractCode(
((GetContractCodeAction)action).ContractHash));
}
else if (action is HandleTransactionAction)
{
((HandleTransactionAction)action).SetResult(HandleTransaction(((HandleTransactionAction)action).Tx, ((HandleTransactionAction)action).CheckInDb));
}
else if (action is GetBlockAction)
{
((GetBlockAction)action).SetResult(GetBlock(((GetBlockAction)action).BkHash));
}
else if (action is GetTxAction)
{
((GetTxAction)action).SetResult(GetTransaction(((GetTxAction)action).TxHash));
}
else if (action is ExecuteContractAction)
{
var executeContractAction = ((ExecuteContractAction)action);
Types.Transaction tx;
var result = AssembleAutoTx(executeContractAction.ContractHash, executeContractAction.Message, out tx, executeContractAction.Message != null);
((ExecuteContractAction)action).SetResult(new Tuple <bool, Types.Transaction>(result, tx));
}
//TODO: remove
else if (action is GetUTXOSetAction)
{
var getUTXOSetAction = (GetUTXOSetAction)action;
HashDictionary <List <Types.Output> > txOutputs;
HashDictionary <Types.Transaction> txs;
GetUTXOSet(getUTXOSetAction.Predicate, out txOutputs, out txs);
getUTXOSetAction.SetResult(new Tuple <HashDictionary <List <Types.Output> >, HashDictionary <Types.Transaction> >(txOutputs, txs));
}
//TODO: rename
else if (action is GetUTXOSetAction2)
{
using (var dbTx = _DBContext.GetTransactionContext())
{
((GetUTXOSetAction2)action).SetResult(UTXOStore.All(dbTx).ToList());
}
}
#if TEST
else if (action is GetBlockLocationAction)
{
using (var dbTx = _DBContext.GetTransactionContext())
{
((GetBlockLocationAction)action).SetResult(BlockStore.GetLocation(dbTx, ((GetBlockLocationAction)action).Block));
}
}
#endif
}
catch (Exception e)
{
#if DEBUG
BlockChainTrace.Error("Blockchain request handle got an exception.\n\nOriginal caller's stack:\n\n" + action.StackTrace + "\n\nException:\n\n", e);
#else
BlockChainTrace.Error("Blockchain request exception", e);
#endif
}
}
}
/// <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);
}
}
public HashDictionary <ACSItem> GetExpiringList(TransactionContext dbTx, uint blockNumber)
{
#if TRACE
All(dbTx).Where(t => t.Item2.LastBlock == blockNumber).ToList().ForEach(t => BlockChainTrace.Information($"contract due to expire at {blockNumber}", t.Item1));
#endif
var values = new HashDictionary <ACSItem>();
foreach (var contract in All(dbTx).Where(t => t.Item2.LastBlock <= blockNumber))
{
values[contract.Item1] = contract.Item2;
}
return(values);
}