/// <summary>
/// Creates a new instance of a smart contract by invoking the contract's constructor
/// </summary>
public VmExecutionResult Create(byte[] contractCode,
ISmartContractExecutionContext context,
IGasMeter gasMeter,
IPersistentState persistentState,
IContractStateRepository repository)
{
this.logger.LogTrace("()");
byte[] gasInjectedCode = SmartContractGasInjector.AddGasCalculationToConstructor(contractCode);
Type contractType = Load(gasInjectedCode);
var internalTransferList = new List <TransferInfo>();
IInternalTransactionExecutor internalTransactionExecutor = this.internalTransactionExecutorFactory.Create(repository, internalTransferList);
var balanceState = new BalanceState(repository, context.Message.Value, internalTransferList);
var contractState = new SmartContractState(
context.Block,
context.Message,
persistentState,
gasMeter,
internalTransactionExecutor,
new InternalHashHelper(),
() => balanceState.GetBalance(context.ContractAddress));
// Invoke the constructor of the provided contract code
LifecycleResult result = SmartContractConstructor.Construct(contractType, contractState, context.Parameters);
if (!result.Success)
{
LogException(result.Exception);
this.logger.LogTrace("(-)[CREATE_CONTRACT_INSTANTIATION_FAILED]:{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
return(VmExecutionResult.Error(gasMeter.GasConsumed, result.Exception.InnerException ?? result.Exception));
}
else
{
this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_SUCCEEDED]");
}
this.logger.LogTrace("(-):{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
return(VmExecutionResult.Success(internalTransferList, gasMeter.GasConsumed, result.Object));
}
/// <summary>
/// Creates a new instance of a smart contract by invoking the contract's constructor
/// </summary>
public VmExecutionResult Create(IGasMeter gasMeter,
IContractStateRepository repository,
ICreateData createData,
ITransactionContext transactionContext)
{
this.logger.LogTrace("()");
// TODO: Spend Validation + Creation Fee here.
// Decompile the contract execution code and validate it.
SmartContractDecompilation decompilation = SmartContractDecompiler.GetModuleDefinition(createData.ContractExecutionCode);
SmartContractValidationResult validation = this.validator.Validate(decompilation);
// If validation failed, refund the sender any remaining gas.
if (!validation.IsValid)
{
this.logger.LogTrace("(-)[CONTRACT_VALIDATION_FAILED]");
return(VmExecutionResult.Error(gasMeter.GasConsumed, new SmartContractValidationException(validation.Errors)));
}
byte[] gasInjectedCode = SmartContractGasInjector.AddGasCalculationToConstructor(createData.ContractExecutionCode, decompilation.ContractType.Name);
Type contractType = Load(gasInjectedCode, decompilation.ContractType.Name);
uint160 contractAddress = this.addressGenerator.GenerateAddress(transactionContext.TransactionHash, transactionContext.GetNonceAndIncrement());
// Create an account for the contract in the state repository.
repository.CreateAccount(contractAddress);
IPersistenceStrategy persistenceStrategy = new MeteredPersistenceStrategy(repository, gasMeter, new BasicKeyEncodingStrategy());
var persistentState = new PersistentState(persistenceStrategy, contractAddress, this.network);
var internalTransferList = new List <TransferInfo>();
IInternalTransactionExecutor internalTransactionExecutor = this.internalTransactionExecutorFactory.Create(this, repository, internalTransferList, transactionContext);
var balanceState = new BalanceState(repository, transactionContext.Amount, internalTransferList);
var contractState = new SmartContractState(
new Block(
transactionContext.BlockHeight,
transactionContext.Coinbase.ToAddress(this.network)
),
new Message(
contractAddress.ToAddress(this.network),
transactionContext.From.ToAddress(this.network),
transactionContext.Amount
),
persistentState,
gasMeter,
internalTransactionExecutor,
new InternalHashHelper(),
() => balanceState.GetBalance(contractAddress));
LogExecutionContext(this.logger, contractState.Block, contractState.Message, contractAddress, createData);
// Invoke the constructor of the provided contract code
LifecycleResult result = SmartContractConstructor.Construct(contractType, contractState, createData.MethodParameters);
if (!result.Success)
{
LogException(result.Exception);
this.logger.LogTrace("(-)[CREATE_CONTRACT_INSTANTIATION_FAILED]:{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
return(VmExecutionResult.Error(gasMeter.GasConsumed, result.Exception.InnerException ?? result.Exception));
}
this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_SUCCEEDED]");
this.logger.LogTrace("(-):{0}={1}, {2}={3}", nameof(contractAddress), contractAddress, nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
repository.SetCode(contractAddress, createData.ContractExecutionCode);
repository.SetContractType(contractAddress, contractType.Name);
return(VmExecutionResult.CreationSuccess(contractAddress, internalTransferList, gasMeter.GasConsumed, result.Object));
}
/// <summary>
/// Invokes a method on an existing smart contract
/// </summary>
public VmExecutionResult ExecuteMethod(
IGasMeter gasMeter,
IContractStateRepository repository,
ICallData callData,
ITransactionContext transactionContext)
{
this.logger.LogTrace("(){0}:{1}", nameof(callData.MethodName), callData.MethodName);
if (callData.MethodName == null)
{
this.logger.LogTrace("(-)[CALLCONTRACT_METHODNAME_NOT_GIVEN]");
return(VmExecutionResult.Error(gasMeter.GasConsumed, null));
}
byte[] contractExecutionCode = repository.GetCode(callData.ContractAddress);
string typeName = repository.GetContractType(callData.ContractAddress);
if (contractExecutionCode == null)
{
return(VmExecutionResult.Error(gasMeter.GasConsumed, new SmartContractDoesNotExistException(callData.MethodName)));
}
byte[] gasInjectedCode = SmartContractGasInjector.AddGasCalculationToContractMethod(contractExecutionCode, typeName, callData.MethodName);
Type contractType = Load(gasInjectedCode, typeName);
if (contractType == null)
{
this.logger.LogTrace("(-)[CALLCONTRACT_CONTRACTTYPE_NULL]");
return(VmExecutionResult.Error(gasMeter.GasConsumed, null));
}
uint160 contractAddress = callData.ContractAddress;
IPersistenceStrategy persistenceStrategy = new MeteredPersistenceStrategy(repository, gasMeter, new BasicKeyEncodingStrategy());
IPersistentState persistentState = new PersistentState(persistenceStrategy, contractAddress, this.network);
var internalTransferList = new List <TransferInfo>();
IInternalTransactionExecutor internalTransactionExecutor = this.internalTransactionExecutorFactory.Create(this, repository, internalTransferList, transactionContext);
var balanceState = new BalanceState(repository, transactionContext.Amount, internalTransferList);
var contractState = new SmartContractState(
new Block(
transactionContext.BlockHeight,
transactionContext.Coinbase.ToAddress(this.network)
),
new Message(
callData.ContractAddress.ToAddress(this.network),
transactionContext.From.ToAddress(this.network),
transactionContext.Amount
),
persistentState,
gasMeter,
internalTransactionExecutor,
new InternalHashHelper(),
() => balanceState.GetBalance(callData.ContractAddress));
LogExecutionContext(this.logger, contractState.Block, contractState.Message, contractAddress, callData);
LifecycleResult result = SmartContractRestorer.Restore(contractType, contractState);
if (!result.Success)
{
LogException(result.Exception);
this.logger.LogTrace("(-)[CALLCONTRACT_INSTANTIATION_FAILED]:{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
return(VmExecutionResult.Error(gasMeter.GasConsumed, result.Exception.InnerException ?? result.Exception));
}
else
{
this.logger.LogTrace("[CALL_CONTRACT_INSTANTIATION_SUCCEEDED]");
}
object methodResult = null;
try
{
MethodInfo methodToInvoke = contractType.GetMethod(callData.MethodName);
if (methodToInvoke == null)
{
throw new ArgumentException(string.Format("[CALLCONTRACT_METHODTOINVOKE_NULL_DOESNOT_EXIST]:{0}={1}", nameof(callData.MethodName), callData.MethodName));
}
if (methodToInvoke.IsConstructor)
{
throw new ConstructorInvocationException("[CALLCONTRACT_CANNOT_INVOKE_CTOR]");
}
SmartContract smartContract = result.Object;
methodResult = methodToInvoke.Invoke(smartContract, callData.MethodParameters);
}
catch (ArgumentException argumentException)
{
LogException(argumentException);
return(VmExecutionResult.Error(gasMeter.GasConsumed, argumentException));
}
catch (TargetInvocationException targetException)
{
LogException(targetException);
return(VmExecutionResult.Error(gasMeter.GasConsumed, targetException.InnerException ?? targetException));
}
catch (TargetParameterCountException parameterException)
{
LogException(parameterException);
}
catch (ConstructorInvocationException constructorInvocationException)
{
LogException(constructorInvocationException);
return(VmExecutionResult.Error(gasMeter.GasConsumed, constructorInvocationException));
}
this.logger.LogTrace("(-):{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
return(VmExecutionResult.Success(internalTransferList, gasMeter.GasConsumed, methodResult));
}
/// <summary>
/// Invokes a method on an existing smart contract
/// </summary>
public VmExecutionResult ExecuteMethod(byte[] contractCode,
string contractMethodName,
ISmartContractExecutionContext context,
IGasMeter gasMeter,
IPersistentState persistentState,
IContractStateRepository repository)
{
this.logger.LogTrace("(){0}:{1}", nameof(contractMethodName), contractMethodName);
ISmartContractExecutionResult executionResult = new SmartContractExecutionResult();
if (contractMethodName == null)
{
this.logger.LogTrace("(-)[CALLCONTRACT_METHODNAME_NOT_GIVEN]");
return(VmExecutionResult.Error(gasMeter.GasConsumed, null));
}
byte[] gasInjectedCode = SmartContractGasInjector.AddGasCalculationToContractMethod(contractCode, contractMethodName);
Type contractType = Load(gasInjectedCode);
if (contractType == null)
{
this.logger.LogTrace("(-)[CALLCONTRACT_CONTRACTTYPE_NULL]");
return(VmExecutionResult.Error(gasMeter.GasConsumed, null));
}
var internalTransferList = new List <TransferInfo>();
IInternalTransactionExecutor internalTransactionExecutor = this.internalTransactionExecutorFactory.Create(repository, internalTransferList);
var balanceState = new BalanceState(repository, context.Message.Value, internalTransferList);
var contractState = new SmartContractState(
context.Block,
context.Message,
persistentState,
gasMeter,
internalTransactionExecutor,
new InternalHashHelper(),
() => balanceState.GetBalance(context.ContractAddress));
LifecycleResult result = SmartContractRestorer.Restore(contractType, contractState);
if (!result.Success)
{
LogException(result.Exception);
this.logger.LogTrace("(-)[CALLCONTRACT_INSTANTIATION_FAILED]:{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
executionResult.Exception = result.Exception.InnerException ?? result.Exception;
executionResult.GasConsumed = gasMeter.GasConsumed;
return(VmExecutionResult.Error(gasMeter.GasConsumed, result.Exception.InnerException ?? result.Exception));
}
else
{
this.logger.LogTrace("[CALL_CONTRACT_INSTANTIATION_SUCCEEDED]");
}
object methodResult = null;
try
{
MethodInfo methodToInvoke = contractType.GetMethod(contractMethodName);
if (methodToInvoke == null)
{
throw new ArgumentException(string.Format("[CALLCONTRACT_METHODTOINVOKE_NULL_DOESNOT_EXIST]:{0}={1}", nameof(contractMethodName), contractMethodName));
}
if (methodToInvoke.IsConstructor)
{
throw new ConstructorInvocationException("[CALLCONTRACT_CANNOT_INVOKE_CTOR]");
}
SmartContract smartContract = result.Object;
methodResult = methodToInvoke.Invoke(smartContract, context.Parameters);
}
catch (ArgumentException argumentException)
{
LogException(argumentException);
return(VmExecutionResult.Error(gasMeter.GasConsumed, argumentException));
}
catch (TargetInvocationException targetException)
{
LogException(targetException);
return(VmExecutionResult.Error(gasMeter.GasConsumed, targetException.InnerException ?? targetException));
}
catch (TargetParameterCountException parameterException)
{
LogException(parameterException);
}
catch (ConstructorInvocationException constructorInvocationException)
{
LogException(constructorInvocationException);
return(VmExecutionResult.Error(gasMeter.GasConsumed, constructorInvocationException));
}
this.logger.LogTrace("(-):{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed);
return(VmExecutionResult.Success(internalTransferList, gasMeter.GasConsumed, methodResult));
}
/// <summary>
/// Rewrites the <see cref="ModuleDefinition"/> on the type with this name to include opcodes for measuring gas consumption.
/// </summary>
/// <remarks>
/// TODO - Make this a generic 'rewrite' method and pass in a rewriter.
/// </remarks>
public void InjectMethodGas(string typeName, MethodCall methodCall)
{
this.ModuleDefinition = SmartContractGasInjector.AddGasCalculationToContractMethod(this.ModuleDefinition, typeName, methodCall.Name);
}
/// <summary>
/// Rewrites the smart contract constructor of the <see cref="ModuleDefinition"/> to include opcodes for measuring gas consumption.
/// </summary>
/// <remarks>
/// TODO - Make this a generic 'rewrite' method and pass in a rewriter.
/// </remarks>
public void InjectConstructorGas()
{
this.ModuleDefinition = SmartContractGasInjector.AddGasCalculationToConstructor(this.ModuleDefinition, this.ContractType.Name);
}
