vmcommon

package module
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 Go to latest Published: Feb 9, 2023 License: GPL-3.0 Imports: 8 Imported by: 0

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me-vm-common

Common structs between VM and node

Documentation

Index

Constants

View Source 
const (
	// MetadataUpgradeable is the bit for upgradable flag
	MetadataUpgradeable = 1
	// MetadataPayable is the bit for payable flag
	MetadataPayable = 2
	// MetadataReadable is the bit for readable flag
	MetadataReadable = 4
)
View Source 
const NumInitCharactersForScAddress = 10

NumInitCharactersForScAddress numbers of characters for smart contract address identifier

View Source 
const ShardIdentiferLen = 2

ShardIdentiferLen number of characters for shard identifier in an address

View Source 
const VMTypeLen = 2

VMTypeLen number of characters with VMType identifier in an address, these are the last 2 characters from the initial identifier

Variables

View Source 
var ErrSubtractionOverflow = errors.New("uint64 subtraction overflowed")

ErrSubtractionOverflow signals that uint64 subtraction overflowed

View Source 
var SystemAccountAddress = bytes.Repeat([]byte{255}, 32)

SystemAccountAddress is the hard-coded address in which we save global settings on all shards

Functions

func IsAllowedToSaveUnderKey 

func IsAllowedToSaveUnderKey(key []byte) bool

IsAllowedToSaveUnderKey returns if saving key-value in data tries under given key is allowed

func IsEmptyAddress 

func IsEmptyAddress(address []byte) bool

IsEmptyAddress returns whether an address is empty

func IsMetachainIdentifier 

func IsMetachainIdentifier(identifier []byte) bool

IsMetachainIdentifier verifies if the identifier is of type metachain

func IsSmartContractAddress 

func IsSmartContractAddress(rcvAddress []byte) bool

IsSmartContractAddress verifies if a set address is of type smart contract

func IsSmartContractOnMetachain 

func IsSmartContractOnMetachain(identifier []byte, rcvAddress []byte) bool

IsSmartContractOnMetachain verifies if an address is smart contract on metachain

func IsSystemAccountAddress 

func IsSystemAccountAddress(address []byte) bool

IsSystemAccountAddress returns true if given address is system account address

func SafeSubUint64 

func SafeSubUint64(a, b uint64) (uint64, error)

SafeSubUint64 performs subtraction on uint64 and returns an error if it overflows

Types

type AcceptPayableHandler added in v0.0.6 

type AcceptPayableHandler interface {
	SetPayableHandler(payableHandler PayableHandler) error
	IsInterfaceNil() bool
}

AcceptPayableHandler defines the methods to accept a payable handler through a set function

type AccountDataHandler 

type AccountDataHandler interface {
	RetrieveValue(key []byte) ([]byte, error)
	SaveKeyValue(key []byte, value []byte) error
	IsInterfaceNil() bool
}

AccountDataHandler models what how to manipulate data held by a SC account

type AccountHandler 

type AccountHandler interface {
	AddressBytes() []byte
	IncreaseNonce(nonce uint64)
	GetNonce() uint64
	IsInterfaceNil() bool
}

AccountHandler models a state account, which can journalize and revert It knows about code and data, as data structures not hashes

type AccountsAdapter 

type AccountsAdapter interface {
	GetExistingAccount(address []byte) (AccountHandler, error)
	LoadAccount(address []byte) (AccountHandler, error)
	SaveAccount(account AccountHandler) error
	RemoveAccount(address []byte) error
	Commit() ([]byte, error)
	JournalLen() int
	RevertToSnapshot(snapshot int) error
	GetNumCheckpoints() uint32
	GetCode(codeHash []byte) []byte

	RootHash() ([]byte, error)
	RecreateTrie(rootHash []byte) error
	IsInterfaceNil() bool
}

AccountsAdapter is used for the structure that manages the accounts on top of a trie.PatriciaMerkleTrie implementation

type BaseOperationCost 

type BaseOperationCost struct {
	StorePerByte      uint64
	ReleasePerByte    uint64
	DataCopyPerByte   uint64
	PersistPerByte    uint64
	CompilePerByte    uint64
	AoTPreparePerByte uint64
}

BaseOperationCost defines cost for base operation cost

type BlockchainHook 

type BlockchainHook interface {
	// NewAddress yields the address of a new SC account, when one such account is created.
	// The result should only depend on the creator address and nonce.
	// Returning an empty address lets the VM decide what the new address should be.
	NewAddress(creatorAddress []byte, creatorNonce uint64, vmType []byte) ([]byte, error)

	// GetStorageData should yield the storage value for a certain account and index.
	// Should return an empty byte array if the key is missing from the account storage,
	// or if account does not exist.
	GetStorageData(accountAddress []byte, index []byte) ([]byte, error)

	// GetBlockhash returns the hash of the block with the asked nonce if available
	GetBlockhash(nonce uint64) ([]byte, error)

	// LastNonce returns the nonce from from the last committed block
	LastNonce() uint64

	// LastRound returns the round from the last committed block
	LastRound() uint64

	// LastTimeStamp returns the timeStamp from the last committed block
	LastTimeStamp() uint64

	// LastRandomSeed returns the random seed from the last committed block
	LastRandomSeed() []byte

	// LastEpoch returns the epoch from the last committed block
	LastEpoch() uint32

	// GetStateRootHash returns the state root hash from the last committed block
	GetStateRootHash() []byte

	// CurrentNonce returns the nonce from the current block
	CurrentNonce() uint64

	// CurrentRound returns the round from the current block
	CurrentRound() uint64

	// CurrentTimeStamp return the timestamp from the current block
	CurrentTimeStamp() uint64

	// CurrentRandomSeed returns the random seed from the current header
	CurrentRandomSeed() []byte

	// CurrentEpoch returns the current epoch
	CurrentEpoch() uint32

	// ProcessBuiltInFunction will process the builtIn function for the created input
	ProcessBuiltInFunction(input *ContractCallInput) (*VMOutput, error)

	// GetBuiltinFunctionNames returns the names of protocol built-in functions
	GetBuiltinFunctionNames() FunctionNames

	// GetAllState returns the full state of the account, all the key-value saved
	GetAllState(address []byte) (map[string][]byte, error)

	// GetUserAccount returns a user account
	GetUserAccount(address []byte) (UserAccountHandler, error)

	// GetCode returns the code for the given account
	GetCode(UserAccountHandler) []byte

	// GetShardOfAddress returns the shard ID of a given address
	GetShardOfAddress(address []byte) uint32

	// IsSmartContract returns whether the address points to a smart contract
	IsSmartContract(address []byte) bool

	// IsPayable checks weather the provided address can receive MOA or not
	IsPayable(address []byte) (bool, error)

	// SaveCompiledCode saves to cache and storage the compiled code
	SaveCompiledCode(codeHash []byte, code []byte)

	// GetCompiledCode returns the compiled code if it finds in the cache or storage
	GetCompiledCode(codeHash []byte) (bool, []byte)

	// ClearCompiledCodes clears the cache and storage of compiled codes
	ClearCompiledCodes()

	// GetDCTToken loads the DCT digital token for the given key
	GetDCTToken(address []byte, tokenID []byte, nonce uint64) (*dct.DCToken, error)

	// GetSnapshot gets the number of entries in the journal as a snapshot id
	GetSnapshot() int

	// RevertToSnapshot reverts snaphots up to the specified one
	RevertToSnapshot(snapshot int) error

	// IsInterfaceNil returns true if there is no value under the interface
	IsInterfaceNil() bool
}

BlockchainHook is the interface for VM blockchain callbacks

type BuiltInCost 

type BuiltInCost struct {
	ChangeOwnerAddress      uint64
	ClaimDeveloperRewards   uint64
	SaveUserName            uint64
	SaveKeyValue            uint64
	DCTTransfer             uint64
	DCTBurn                 uint64
	DCTLocalMint            uint64
	DCTLocalBurn            uint64
	DCTNFTCreate            uint64
	DCTNFTAddQuantity       uint64
	DCTNFTBurn              uint64
	DCTNFTTransfer          uint64
	DCTNFTChangeCreateOwner uint64
	DCTNFTMultiTransfer     uint64
	DCTNFTAddURI            uint64
	DCTNFTUpdateAttributes  uint64
}

BuiltInCost defines cost for built-in methods

type BuiltInFunctionContainer 

type BuiltInFunctionContainer interface {
	Get(key string) (BuiltinFunction, error)
	Add(key string, function BuiltinFunction) error
	Replace(key string, function BuiltinFunction) error
	Remove(key string)
	Len() int
	Keys() map[string]struct{}
	IsInterfaceNil() bool
}

BuiltInFunctionContainer defines the methods for the built-in protocol container

type BuiltinFunction 

type BuiltinFunction interface {
	ProcessBuiltinFunction(acntSnd, acntDst UserAccountHandler, vmInput *ContractCallInput) (*VMOutput, error)
	SetNewGasConfig(gasCost *GasCost)
	IsActive() bool
	IsInterfaceNil() bool
}

BuiltinFunction defines the methods for the built-in protocol smart contract functions

type CodeMetadata 

type CodeMetadata struct {
	Payable     bool
	Upgradeable bool
	Readable    bool
}

CodeMetadata represents smart contract code metadata

func CodeMetadataFromBytes 

func CodeMetadataFromBytes(bytes []byte) CodeMetadata

CodeMetadataFromBytes creates a metadata object from bytes

func (*CodeMetadata) ToBytes 

func (metadata *CodeMetadata) ToBytes() []byte

ToBytes converts the metadata to bytes

type ContractCallInput 

type ContractCallInput struct {
	VMInput

	// RecipientAddr is the smart contract public key, "to".
	RecipientAddr []byte

	// Function is the name of the smart contract function that will be called.
	// The function must be public
	Function string

	// AllowInitFunction specifies whether calling the initialization method of
	// the smart contract is allowed or not
	AllowInitFunction bool
}

ContractCallInput VM input when calling a function from an existing contract

type ContractCreateInput 

type ContractCreateInput struct {
	VMInput

	// ContractCode is the code of the contract being created, assembled into a byte array.
	ContractCode []byte

	// ContractCodeMetadata is the code metadata of the contract being created.
	ContractCodeMetadata []byte
}

ContractCreateInput VM input when creating a new contract. Here we have no RecipientAddr because the address (PK) of the created account will be provided by the vmcommon. We also do not need to specify a Function field, because on creation `init` is always called.

type Coordinator 

type Coordinator interface {
	NumberOfShards() uint32
	ComputeId(address []byte) uint32
	SelfId() uint32
	SameShard(firstAddress, secondAddress []byte) bool
	CommunicationIdentifier(destShardID uint32) string
	IsInterfaceNil() bool
}

Coordinator defines what a shard state coordinator should hold

type CryptoHook 

type CryptoHook interface {
	// Sha256 cryptographic function
	Sha256(data []byte) ([]byte, error)

	// Keccak256 cryptographic function
	Keccak256(data []byte) ([]byte, error)

	// Ripemd160 cryptographic function
	Ripemd160(data []byte) ([]byte, error)

	// Ecrecover calculates the corresponding Ethereum address for the public key which created the given signature
	// https://ewasm.readthedocs.io/en/mkdocs/system_contracts/
	Ecrecover(hash []byte, recoveryID []byte, r []byte, s []byte) ([]byte, error)

	// IsInterfaceNil returns true if there is no value under the interface
	IsInterfaceNil() bool
}

CryptoHook interface for VM krypto functions

type DCTGlobalSettingsHandler 

type DCTGlobalSettingsHandler interface {
	IsPaused(token []byte) bool
	IsLimitedTransfer(tokenKey []byte) bool
	IsInterfaceNil() bool
}

DCTGlobalSettingsHandler provides global settings functions for an DCT token

type DCTRoleHandler 

type DCTRoleHandler interface {
	CheckAllowedToExecute(account UserAccountHandler, tokenID []byte, action []byte) error
	IsInterfaceNil() bool
}

DCTRoleHandler provides IsAllowedToExecute function for an DCT

type DCTTransfer 

type DCTTransfer struct {
	// DCTValue is the value (amount of tokens) transferred by the transaction.
	// Before reaching the VM this value is subtracted from sender balance (CallerAddr)
	// and to added to the smart contract balance.
	// It is often, but not always zero in SC calls.
	DCTValue *big.Int

	// DCTTokenName is the name of the token which was transferred by the transaction to the SC
	DCTTokenName []byte

	// DCTTokenType is the type of the transferred token
	DCTTokenType uint32

	// DCTTokenNonce is the nonce for the given NFT token
	DCTTokenNonce uint64
}

DCTTransfer defines the structure for and DCT / NFT transfer

type DCTTransferParser 

type DCTTransferParser interface {
	ParseDCTTransfers(sndAddr []byte, rcvAddr []byte, function string, args [][]byte) (*ParsedDCTTransfers, error)
	IsInterfaceNil() bool
}

DCTTransferParser can parse single and multi DCT / NFT transfers

type EpochNotifier 

type EpochNotifier interface {
	RegisterNotifyHandler(handler EpochSubscriberHandler)
	IsInterfaceNil() bool
}

EpochNotifier can notify upon an epoch change and provide the current epoch

type EpochSubscriberHandler 

type EpochSubscriberHandler interface {
	EpochConfirmed(epoch uint32, timestamp uint64)
	IsInterfaceNil() bool
}

EpochSubscriberHandler defines the behavior of a component that can be notified if a new epoch was confirmed

type FunctionNames 

type FunctionNames = map[string]struct{}

FunctionNames (alias) is a map of function names

type GasCost 

type GasCost struct {
	BaseOperationCost BaseOperationCost
	BuiltInCost       BuiltInCost
}

GasCost holds all the needed gas costs for system smart contracts

type LogEntry 

type LogEntry struct {
	Identifier []byte
	Address    []byte
	Topics     [][]byte
	Data       []byte
}

LogEntry represents an entry in the contract execution log. TODO: document all fields.

type Marshalizer 

type Marshalizer interface {
	Marshal(obj interface{}) ([]byte, error)
	Unmarshal(obj interface{}, buff []byte) error
	IsInterfaceNil() bool
}

Marshalizer defines the 2 basic operations: serialize (marshal) and deserialize (unmarshal)

type OutputAccount 

type OutputAccount struct {
	// Address is the public key of the account.
	Address []byte

	// Nonce is the new account nonce.
	Nonce uint64

	// Balance is the account balance after running a SC.
	// Only used for some tests now, please ignore. Might be removed in the future.
	Balance *big.Int

	// StorageUpdates is a map containing pointers to StorageUpdate structs,
	// indexed with strings produced by `string(StorageUpdate.Offset)`, for fast
	// access by the Offset of the StorageUpdate. These StorageUpdate structs
	// will be processed by the Node to modify the storage of the SmartContract.
	// Please note that it is likely that not all existing account storage keys
	// show up here.
	StorageUpdates map[string]*StorageUpdate

	// Code is the assembled code of a smart contract account.
	// This field will be populated when a new SC must be created after the transaction.
	Code []byte

	// CodeMetadata is the metadata of the code
	// Like "Code", this field will be populated when a new SC must be created after the transaction.
	CodeMetadata []byte

	// CodeDeployerAddress will be populated in case of contract deployment or upgrade (both direct and indirect)
	CodeDeployerAddress []byte

	// BalanceDelta is by how much the balance should change following the SC execution.
	// A negative value indicates that balance should decrease.
	BalanceDelta *big.Int

	// OutputTransfers represents the cross shard calls for this account
	OutputTransfers []OutputTransfer

	// GasUsed will be populated if the contract was called in the same shard
	GasUsed uint64
}

OutputAccount shows the state of an account after contract execution. It can be an existing account or a new account created by the transaction. Note: the current implementation might also return unmodified accounts.

func (*OutputAccount) MergeOutputAccounts 

func (o *OutputAccount) MergeOutputAccounts(outAcc *OutputAccount)

MergeOutputAccounts merges the given account into the current one

func (*OutputAccount) MergeStorageUpdates 

func (o *OutputAccount) MergeStorageUpdates(outAcc *OutputAccount)

MergeStorageUpdates will copy all the storage updates from the given output account

type OutputTransfer 

type OutputTransfer struct {
	// Value to be transferred
	Value *big.Int
	// GasLimit to used for the call
	GasLimit uint64
	// GasLocked holds the amount of gas to be kept aside for the eventual callback execution
	GasLocked uint64
	// Data to be used in cross call
	Data []byte
	// CallType is set if it is a smart contract invocation
	CallType vm.CallType
	// SenderAddress is the actual sender for the given output transfer, this is needed when
	// contract A calls contract B and contract B does the transfers
	SenderAddress []byte
}

OutputTransfer contains the fields needed to create transfers to another shard

type ParsedDCTTransfers 

type ParsedDCTTransfers struct {
	DCTTransfers []*DCTTransfer
	RcvAddr      []byte
	CallFunction string
	CallArgs     [][]byte
}

ParsedDCTTransfers defines the struct for the parsed dct transfers

type PayableHandler 

type PayableHandler interface {
	IsPayable(address []byte) (bool, error)
	IsInterfaceNil() bool
}

PayableHandler provides IsPayable function which returns if an account is payable or not

type ReturnCode 

type ReturnCode int

ReturnCode is an enum with the possible error codes returned by the VM 

const (
	// Ok is returned when execution was completed normally.
	Ok ReturnCode = 0

	// FunctionNotFound is returned when the input specifies a function name that does not exist or is not public.
	FunctionNotFound ReturnCode = 1

	// FunctionWrongSignature is returned when the wrong number of arguments is provided.
	FunctionWrongSignature ReturnCode = 2

	// ContractNotFound is returned when the called contract does not exist.
	ContractNotFound ReturnCode = 3

	// UserError is returned for various execution errors.
	UserError ReturnCode = 4

	// OutOfGas is returned when VM execution runs out of gas.
	OutOfGas ReturnCode = 5

	// AccountCollision is returned when created account already exists.
	AccountCollision ReturnCode = 6

	// OutOfFunds is returned when the caller (sender) runs out of funds.
	OutOfFunds ReturnCode = 7

	// CallStackOverFlow is returned when stack overflow occurs.
	CallStackOverFlow ReturnCode = 8

	// ContractInvalid is returned when the contract is invalid.
	ContractInvalid ReturnCode = 9

	// ExecutionFailed is returned when the execution of the specified function has failed.
	ExecutionFailed ReturnCode = 10

	// UpgradeFailed is returned when the upgrade of the contract has failed
	UpgradeFailed ReturnCode = 11

	// SimulateFailed is returned when tx simulation fails execution
	SimulateFailed ReturnCode = 12
)

func (ReturnCode) String 

func (rc ReturnCode) String() string

type StorageUpdate 

type StorageUpdate struct {
	// Offset is the storage key.
	// The VM treats this as a big.Int.
	Offset []byte

	// Data is the new storage value.
	// The VM treats this as a big.Int.
	// Zero indicates missing data for the key (or even a missing key),
	// therefore a value of zero here indicates that
	// the storage map entry with the given key can be deleted.
	Data []byte
}

StorageUpdate represents a change in the account storage (insert, update or delete) Note: current implementation might also return unmodified storage entries.

type UserAccountHandler 

type UserAccountHandler interface {
	GetCodeMetadata() []byte
	GetCodeHash() []byte
	GetRootHash() []byte
	AccountDataHandler() AccountDataHandler
	AddToBalance(value *big.Int) error
	GetBalance() *big.Int
	ClaimDeveloperRewards([]byte) (*big.Int, error)
	GetDeveloperReward() *big.Int
	ChangeOwnerAddress([]byte, []byte) error
	SetOwnerAddress([]byte)
	GetOwnerAddress() []byte
	SetUserName(userName []byte)
	GetUserName() []byte
	AccountHandler
}

UserAccountHandler models a user account, which can journalize account's data with some extra features like balance, developer rewards, owner

type VMExecutionHandler 

type VMExecutionHandler interface {
	// RunSmartContractCreate computes how a smart contract creation should be performed
	RunSmartContractCreate(input *ContractCreateInput) (*VMOutput, error)

	// RunSmartContractCall computes the result of a smart contract call and how the system must change after the execution
	RunSmartContractCall(input *ContractCallInput) (*VMOutput, error)

	// GasScheduleChange sets a new gas schedule for the VM
	GasScheduleChange(newGasSchedule map[string]map[string]uint64)

	// GetVersion returns the version of the VM instance
	GetVersion() string

	// IsInterfaceNil returns true if there is no value under the interface
	IsInterfaceNil() bool
}

VMExecutionHandler interface for any Dharitri VM endpoint

type VMInput 

type VMInput struct {
	// CallerAddr is the public key of the wallet initiating the transaction, "from".
	CallerAddr []byte

	// Arguments are the call parameters to the smart contract function call
	// For contract creation, these are the parameters to the @init function.
	// For contract call, these are the parameters to the function referenced in ContractCallInput.Function.
	// If the number of arguments does not match the function arity,
	// the transaction will return FunctionWrongSignature ReturnCode.
	Arguments [][]byte

	// CallValue is the MOA value (amount of tokens) transferred by the transaction.
	// Before reaching the VM this value is subtracted from sender balance (CallerAddr)
	// and to added to the smart contract balance.
	// It is often, but not always zero in SC calls.
	CallValue *big.Int

	// CallType is the type of SmartContract call
	// Based on this value, the VM is informed of whether the call is direct,
	// asynchronous, or asynchronous callback.
	CallType vm.CallType

	// GasPrice multiplied by the gas burned by the transaction yields the transaction fee.
	// A larger GasPrice will incentivize block proposers to include the transaction in a block sooner,
	// but will cost the sender more.
	// The total fee should be GasPrice x (GasProvided - VMOutput.GasRemaining - VMOutput.GasRefund).
	// Note: the order of operations on the sender balance is:
	// 1. subtract GasPrice x GasProvided
	// 2. call VM, which will subtract CallValue if enough funds remain
	// 3. reimburse GasPrice x (VMOutput.GasRemaining + VMOutput.GasRefund)
	GasPrice uint64

	// GasProvided is the maximum gas allowed for the smart contract execution.
	// If the transaction consumes more gas than this value, it will immediately terminate
	// and return OutOfGas ReturnCode.
	// The sender will not be charged based on GasProvided, only on the gas burned,
	// so it doesn't cost the sender more to have a higher gas limit.
	GasProvided uint64

	// GasLocked is the amount of gas that must be kept unused during the current
	// call, because it will be used later for a callback. This field is only
	// used during asynchronous calls.
	GasLocked uint64

	// OriginalTxHash
	OriginalTxHash []byte

	// CurrentTxHash
	CurrentTxHash []byte

	// PrevTxHash
	PrevTxHash []byte

	// DCTTransfers
	DCTTransfers []*DCTTransfer

	// ReturnCallAfterError
	ReturnCallAfterError bool
}

VMInput contains the common fields between the 2 types of SC call.

type VMOutput 

type VMOutput struct {
	// ReturnData is the function call returned result.
	// This value does not influence the account state in any way.
	// The value should be accessible in a UI.
	// ReturnData is part of the transaction receipt.
	ReturnData [][]byte

	// ReturnCode is the function call error code.
	// If it is not `Ok`, the transaction failed in some way - gas is, however, consumed anyway.
	// This value does not influence the account state in any way.
	// The value should be accessible to a UI.
	// ReturnCode is part of the transaction receipt.
	ReturnCode ReturnCode

	// ReturnMessage is a message set by the SmartContract, destined for the
	// caller
	ReturnMessage string

	// GasRemaining = VMInput.GasProvided - gas used.
	// It is necessary to compute how much to charge the sender for the transaction.
	GasRemaining uint64

	// GasRefund is how much gas the sender earned during the transaction.
	// Certain operations, like freeing up storage, actually return gas instead of consuming it.
	// Based on GasRefund, the sender could in principle be rewarded instead of taxed.
	GasRefund *big.Int

	// OutputAccounts contains data about all accounts changed as a result of the
	// Transaction. It is a map containing pointers to OutputAccount structs,
	// indexed with strings produced by `string(OutputAccount.Address)`, for fast
	// access by the Address of the OutputAccount.
	// This information tells the Node how to update the account data.
	// It can contain new accounts or existing changed accounts.
	// Note: the current implementation might also retrieve accounts that were not changed.
	OutputAccounts map[string]*OutputAccount

	// DeletedAccounts is a list of public keys of accounts that need to be deleted
	// as a result of the transaction.
	DeletedAccounts [][]byte

	// TouchedAccounts is a list of public keys of accounts that were somehow involved in the VM execution.
	// TODO: investigate what we need to to about these.
	TouchedAccounts [][]byte

	// Logs is a list of event data logged by the vmcommon.
	// Smart contracts can choose to log certain events programatically.
	// There are 3 main use cases for events and logs:
	// 1. smart contract return values for the user interface;
	// 2. asynchronous triggers with data;
	// 3. a cheaper form of storage (e.g. storing historical data that can be rendered by the frontend).
	// The logs should be accessible to the UI.
	// The logs are part of the transaction receipt.
	Logs []*LogEntry
}

VMOutput is the return data and final account state after a SC execution.

func (*VMOutput) GetFirstReturnData 

func (vmOutput *VMOutput) GetFirstReturnData(asType vm.ReturnDataKind) (interface{}, error)

GetFirstReturnData is a helper function that returns the first ReturnData of VMOutput, interpreted as specified.

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