/// <summary> /// Invokes a method on an existing smart contract /// </summary> public VmExecutionResult ExecuteMethod(ISmartContractState contractState, MethodCall methodCall, byte[] contractCode, string typeName) { this.logger.LogTrace("(){0}:{1}", nameof(methodCall.Name), methodCall.Name); ContractByteCode code; using (IContractModuleDefinition moduleDefinition = this.moduleDefinitionReader.Read(contractCode)) { moduleDefinition.InjectMethodGas(typeName, methodCall); code = moduleDefinition.ToByteCode(); } Result <IContract> contractLoadResult = this.Load( code, typeName, contractState.Message.ContractAddress.ToUint160(this.network), contractState); if (!contractLoadResult.IsSuccess) { // TODO this is temporary until we improve error handling overloads var exception = new Exception(contractLoadResult.Error); LogException(exception); this.logger.LogTrace("(-)[LOAD_CONTRACT_FAILED]"); return(VmExecutionResult.Error(exception)); } IContract contract = contractLoadResult.Value; LogExecutionContext(this.logger, contract.State.Block, contract.State.Message, contract.Address); IContractInvocationResult invocationResult = contract.Invoke(methodCall); if (!invocationResult.IsSuccess) { this.logger.LogTrace("(-)[CALLCONTRACT_INSTANTIATION_FAILED]"); return(VmExecutionResult.Error(new Exception("Method invocation failed!"))); } this.logger.LogTrace("[CALL_CONTRACT_INSTANTIATION_SUCCEEDED]"); this.logger.LogTrace("(-)"); return(VmExecutionResult.Success(invocationResult.Return, typeName)); }
/// <summary> /// Invokes a method on an existing smart contract /// </summary> public VmExecutionResult ExecuteMethod(ISmartContractState contractState, MethodCall methodCall, byte[] contractCode, string typeName) { this.logger.LogTrace("(){0}:{1}", nameof(methodCall.Name), methodCall.Name); ContractByteCode code; // Code we're loading from database - can assume it's valid. using (IContractModuleDefinition moduleDefinition = this.moduleDefinitionReader.Read(contractCode).Value) { var observer = new Observer(contractState.GasMeter, MemoryUnitLimit); var rewriter = new ObserverRewriter(observer); moduleDefinition.Rewrite(rewriter); code = moduleDefinition.ToByteCode(); } Result <IContract> contractLoadResult = this.Load( code, typeName, contractState.Message.ContractAddress.ToUint160(this.network), contractState); if (!contractLoadResult.IsSuccess) { LogErrorMessage(contractLoadResult.Error); this.logger.LogTrace("(-)[LOAD_CONTRACT_FAILED]"); return(VmExecutionResult.Error(new ContractErrorMessage(contractLoadResult.Error))); } IContract contract = contractLoadResult.Value; LogExecutionContext(this.logger, contract.State.Block, contract.State.Message, contract.Address); IContractInvocationResult invocationResult = contract.Invoke(methodCall); if (!invocationResult.IsSuccess) { this.logger.LogTrace("(-)[CALLCONTRACT_INSTANTIATION_FAILED]"); return(VmExecutionResult.Error(invocationResult.ErrorMessage)); } this.logger.LogTrace("[CALL_CONTRACT_INSTANTIATION_SUCCEEDED]"); this.logger.LogTrace("(-)"); return(VmExecutionResult.Success(invocationResult.Return, typeName)); }
/// <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(IStateRepository repository, ISmartContractState contractState, byte[] contractCode, object[] parameters, string typeName = null) { this.logger.LogTrace("()"); string typeToInstantiate; ContractByteCode code; // Decompile the contract execution code Result <IContractModuleDefinition> moduleResult = this.moduleDefinitionReader.Read(contractCode); if (moduleResult.IsFailure) { this.logger.LogTrace("(-)[CONTRACT_BYTECODE_INVALID]"); return(VmExecutionResult.Error(new ContractErrorMessage("Contract bytecode is not valid IL."))); } // Validate contract execution code using (IContractModuleDefinition moduleDefinition = moduleResult.Value) { SmartContractValidationResult validation = moduleDefinition.Validate(this.validator); // If validation failed, refund the sender any remaining gas. if (!validation.IsValid) { this.logger.LogTrace("(-)[CONTRACT_VALIDATION_FAILED]"); // TODO: List errors by string. return(VmExecutionResult.Error(new ContractErrorMessage(new SmartContractValidationException(validation.Errors).ToString()))); } typeToInstantiate = typeName ?? moduleDefinition.ContractType.Name; var observer = new Observer(contractState.GasMeter, MemoryUnitLimit); var rewriter = new ObserverRewriter(observer); moduleDefinition.Rewrite(rewriter); code = moduleDefinition.ToByteCode(); } Result <IContract> contractLoadResult = this.Load( code, typeToInstantiate, contractState.Message.ContractAddress.ToUint160(this.network), contractState); if (!contractLoadResult.IsSuccess) { LogErrorMessage(contractLoadResult.Error); this.logger.LogTrace("(-)[LOAD_CONTRACT_FAILED]"); return(VmExecutionResult.Error(new ContractErrorMessage(contractLoadResult.Error))); } IContract contract = contractLoadResult.Value; LogExecutionContext(this.logger, contract.State.Block, contract.State.Message, contract.Address); // Set the code and the Type before the method is invoked repository.SetCode(contract.Address, contractCode); repository.SetContractType(contract.Address, typeToInstantiate); // Invoke the constructor of the provided contract code IContractInvocationResult invocationResult = contract.InvokeConstructor(parameters); if (!invocationResult.IsSuccess) { this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_FAILED]"); return(VmExecutionResult.Error(invocationResult.ErrorMessage)); } this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_SUCCEEDED]"); this.logger.LogTrace("(-):{0}={1}", nameof(contract.Address), contract.Address); return(VmExecutionResult.Success(invocationResult.Return, typeToInstantiate)); }
/// <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> /// Creates a new instance of a smart contract by invoking the contract's constructor /// </summary> public VmExecutionResult Create(IGasMeter gasMeter, IContractState repository, ICreateData createData, ITransactionContext transactionContext, string typeName = null) { this.logger.LogTrace("()"); // TODO: Spend Validation + Creation Fee here. string typeToInstantiate; ContractByteCode code; // Decompile the contract execution code and validate it. using (IContractModuleDefinition moduleDefinition = this.moduleDefinitionReader.Read(createData.ContractExecutionCode)) { SmartContractValidationResult validation = moduleDefinition.Validate(this.validator); // 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))); } typeToInstantiate = typeName ?? moduleDefinition.ContractType.Name; moduleDefinition.InjectConstructorGas(); code = moduleDefinition.ToByteCode(); } var internalTransferList = new List <TransferInfo>(); uint160 address = this.addressGenerator.GenerateAddress(transactionContext.TransactionHash, transactionContext.GetNonceAndIncrement()); var contractLogger = new ContractLogHolder(this.network); ISmartContractState contractState = this.SetupState(contractLogger, internalTransferList, gasMeter, repository, transactionContext, address); Result <IContract> contractLoadResult = this.Load( code, typeToInstantiate, address, contractState); if (!contractLoadResult.IsSuccess) { // TODO this is temporary until we improve error handling overloads var exception = new Exception(contractLoadResult.Error); LogException(exception); this.logger.LogTrace("(-)[LOAD_CONTRACT_FAILED]:{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed); return(VmExecutionResult.Error(gasMeter.GasConsumed, exception)); } IContract contract = contractLoadResult.Value; LogExecutionContext(this.logger, contract.State.Block, contract.State.Message, contract.Address, createData); // Create an account for the contract in the state repository. repository.CreateAccount(contract.Address); // Invoke the constructor of the provided contract code IContractInvocationResult invocationResult = contract.InvokeConstructor(createData.MethodParameters); if (!invocationResult.IsSuccess) { this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_FAILED]"); return(VmExecutionResult.Error(gasMeter.GasConsumed, new Exception("Constructor invocation failed!"))); } this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_SUCCEEDED]"); this.logger.LogTrace("(-):{0}={1}, {2}={3}", nameof(contract.Address), contract.Address, nameof(gasMeter.GasConsumed), gasMeter.GasConsumed); repository.SetCode(contract.Address, createData.ContractExecutionCode); repository.SetContractType(contract.Address, contract.Type.Name); return(VmExecutionResult.CreationSuccess(contract.Address, internalTransferList, gasMeter.GasConsumed, invocationResult.Return, contractLogger.GetRawLogs())); }
/// <summary> /// Invokes a method on an existing smart contract /// </summary> public VmExecutionResult ExecuteMethod( IGasMeter gasMeter, IContractState 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))); } // TODO consolidate this with CallData. MethodCall methodCall = new MethodCall(callData.MethodName, callData.MethodParameters); ContractByteCode code; using (IContractModuleDefinition moduleDefinition = this.moduleDefinitionReader.Read(contractExecutionCode)) { moduleDefinition.InjectMethodGas(typeName, methodCall); code = moduleDefinition.ToByteCode(); } var internalTransferList = new List <TransferInfo>(); var contractLogger = new ContractLogHolder(this.network); ISmartContractState contractState = this.SetupState(contractLogger, internalTransferList, gasMeter, repository, transactionContext, callData.ContractAddress); Result <IContract> contractLoadResult = this.Load( code, typeName, callData.ContractAddress, contractState); if (!contractLoadResult.IsSuccess) { // TODO this is temporary until we improve error handling overloads var exception = new Exception(contractLoadResult.Error); LogException(exception); this.logger.LogTrace("(-)[LOAD_CONTRACT_FAILED]:{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed); return(VmExecutionResult.Error(gasMeter.GasConsumed, exception)); } IContract contract = contractLoadResult.Value; LogExecutionContext(this.logger, contract.State.Block, contract.State.Message, contract.Address, callData); IContractInvocationResult invocationResult = contract.Invoke(methodCall); if (!invocationResult.IsSuccess) { this.logger.LogTrace("(-)[CALLCONTRACT_INSTANTIATION_FAILED]:{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed); return(VmExecutionResult.Error(gasMeter.GasConsumed, new Exception("Method invocation failed!"))); } this.logger.LogTrace("[CALL_CONTRACT_INSTANTIATION_SUCCEEDED]"); this.logger.LogTrace("(-):{0}={1}", nameof(gasMeter.GasConsumed), gasMeter.GasConsumed); return(VmExecutionResult.Success(internalTransferList, gasMeter.GasConsumed, invocationResult.Return, contractLogger.GetRawLogs())); }
/// <summary> /// Creates a new instance of a smart contract by invoking the contract's constructor /// </summary> public VmExecutionResult Create(IContractState repository, ISmartContractState contractState, byte[] contractCode, object[] parameters, string typeName = null) { this.logger.LogTrace("()"); string typeToInstantiate; ContractByteCode code; // Decompile the contract execution code and validate it. using (IContractModuleDefinition moduleDefinition = this.moduleDefinitionReader.Read(contractCode)) { SmartContractValidationResult validation = moduleDefinition.Validate(this.validator); // If validation failed, refund the sender any remaining gas. if (!validation.IsValid) { this.logger.LogTrace("(-)[CONTRACT_VALIDATION_FAILED]"); return(VmExecutionResult.Error(new SmartContractValidationException(validation.Errors))); } typeToInstantiate = typeName ?? moduleDefinition.ContractType.Name; moduleDefinition.InjectConstructorGas(); code = moduleDefinition.ToByteCode(); } Result <IContract> contractLoadResult = this.Load( code, typeToInstantiate, contractState.Message.ContractAddress.ToUint160(this.network), contractState); if (!contractLoadResult.IsSuccess) { // TODO this is temporary until we improve error handling overloads var exception = new Exception(contractLoadResult.Error); LogException(exception); this.logger.LogTrace("(-)[LOAD_CONTRACT_FAILED]"); return(VmExecutionResult.Error(exception)); } IContract contract = contractLoadResult.Value; LogExecutionContext(this.logger, contract.State.Block, contract.State.Message, contract.Address); // Set the code and the Type before the method is invoked repository.SetCode(contract.Address, contractCode); repository.SetContractType(contract.Address, typeToInstantiate); // Invoke the constructor of the provided contract code IContractInvocationResult invocationResult = contract.InvokeConstructor(parameters); if (!invocationResult.IsSuccess) { this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_FAILED]"); return(VmExecutionResult.Error(new Exception("Constructor invocation failed!"))); } this.logger.LogTrace("[CREATE_CONTRACT_INSTANTIATION_SUCCEEDED]"); this.logger.LogTrace("(-):{0}={1}", nameof(contract.Address), contract.Address); return(VmExecutionResult.Success(invocationResult.Return, typeToInstantiate)); }