emulator

package
v0.37.3 Latest Latest
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 Go to latest Published: Aug 16, 2024 License: AGPL-3.0 Imports: 17 Imported by: 5

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Constants

This section is empty.

Variables

View Source 
var DefaultChainConfig = &gethParams.ChainConfig{
	ChainID: types.FlowEVMPreviewNetChainID,

	HomesteadBlock:      bigZero,
	DAOForkBlock:        bigZero,
	DAOForkSupport:      false,
	EIP150Block:         bigZero,
	EIP155Block:         bigZero,
	EIP158Block:         bigZero,
	ByzantiumBlock:      bigZero,
	ConstantinopleBlock: bigZero,
	PetersburgBlock:     bigZero,
	IstanbulBlock:       bigZero,
	BerlinBlock:         bigZero,
	LondonBlock:         bigZero,
	MuirGlacierBlock:    bigZero,

	ShanghaiTime: &zero,
	CancunTime:   &zero,
	PragueTime:   nil,
	VerkleTime:   nil,
}

DefaultChainConfig is the default chain config used by the emulator considers majority of EVM upgrades (e.g. Cancun update) are already applied This has been done through setting the height of these changes to zero nad setting the time for some other changes to zero For the future changes of EVM, we need to update the EVM go mod version and set a proper height for the specific release based on the Flow EVM heights so it could gets activated at a desired time.

Functions

func AddOne64th added in v0.35.17 

func AddOne64th(n uint64) uint64

func GetDefaultSigner 

func GetDefaultSigner() types.Signer

GetDefaultSigner returns a signer which is compatible with the default config

func GetSigner 

func GetSigner(cfg *Config) types.Signer

GetSigner returns a evm signer object that is compatible with the given config

Despite its misleading name, signer encapsulates transaction signature validation functionality and does not provide actual signing functionality. we kept the same name to be consistent with EVM naming.

Types

type BlockView 

type BlockView struct {
	// contains filtered or unexported fields
}

BlockView allows mutation of the evm state as part of a block current version only accepts only a single interaction per block view.

func (*BlockView) BatchRunTransactions added in v0.33.30 

func (bl *BlockView) BatchRunTransactions(txs []*gethTypes.Transaction) ([]*types.Result, error)

BatchRunTransactions runs a batch of EVM transactions

func (*BlockView) DirectCall 

func (bl *BlockView) DirectCall(call *types.DirectCall) (res *types.Result, err error)

DirectCall executes a direct call

func (*BlockView) DryRunTransaction added in v0.33.30 

func (bl *BlockView) DryRunTransaction(
	tx *gethTypes.Transaction,
	from gethCommon.Address,
) (*types.Result, error)

DryRunTransaction runs an unsigned transaction without persisting the state

func (*BlockView) RunTransaction 

func (bl *BlockView) RunTransaction(
	tx *gethTypes.Transaction,
) (result *types.Result, err error)

RunTransaction runs an evm transaction

type CallTracker added in v0.36.3 

type CallTracker struct {
	// contains filtered or unexported fields
}

CallTracker captures precompiled calls

func NewCallTracker added in v0.36.3 

func NewCallTracker() *CallTracker

NewCallTracker constructs a new CallTracker

func (*CallTracker) CaptureRequiredGas added in v0.36.3 

func (ct *CallTracker) CaptureRequiredGas(address types.Address, input []byte, output uint64)

CaptureRequiredGas captures a required gas call

func (*CallTracker) CaptureRun added in v0.36.3 

func (ct *CallTracker) CaptureRun(address types.Address, input []byte, output []byte, err error)

CaptureRun captures a run calls

func (*CallTracker) CapturedCalls added in v0.36.3 

func (ct *CallTracker) CapturedCalls() ([]byte, error)

Encoded

func (*CallTracker) IsCalled added in v0.36.3 

func (ct *CallTracker) IsCalled() bool

IsCalled returns true if any calls has been captured

func (*CallTracker) RegisterPrecompiledContract added in v0.36.3 

func (ct *CallTracker) RegisterPrecompiledContract(pc types.PrecompiledContract) types.PrecompiledContract

RegisterPrecompiledContract registers a precompiled contract for tracking

func (*CallTracker) Reset added in v0.36.3 

func (ct *CallTracker) Reset()

Resets the tracker

type Config 

type Config struct {
	// Chain Config
	ChainConfig *gethParams.ChainConfig
	// EVM config
	EVMConfig gethVM.Config
	// block context
	BlockContext *gethVM.BlockContext
	// transaction context
	TxContext *gethVM.TxContext
	// base unit of gas for direct calls
	DirectCallBaseGasUsage uint64
	// captures extra precompiled calls
	PCTracker *CallTracker
	// BlockTxCount captures the total number of
	// transactions included in this block so far
	BlockTxCountSoFar uint
	// BlockTotalGasSoFar captures the total
	// amount of gas used so far
	BlockTotalGasUsedSoFar uint64
}

Config aggregates all the configuration (chain, evm, block, tx, ...) needed during executing a transaction.

func NewConfig 

func NewConfig(opts ...Option) *Config

NewConfig initializes a new config

func (*Config) ChainRules added in v0.33.30 

func (c *Config) ChainRules() gethParams.Rules

ChainRules returns the chain rules

type Emulator 

type Emulator struct {
	// contains filtered or unexported fields
}

Emulator wraps an EVM runtime where evm transactions and direct calls are accepted.

func NewEmulator 

func NewEmulator(
	ledger atree.Ledger,
	rootAddr flow.Address,
) *Emulator

NewEmulator constructs a new EVM Emulator

func (*Emulator) NewBlockView 

func (em *Emulator) NewBlockView(ctx types.BlockContext) (types.BlockView, error)

NewBlockView constructs a new block view (mutable)

func (*Emulator) NewReadOnlyBlockView 

func (em *Emulator) NewReadOnlyBlockView(ctx types.BlockContext) (types.ReadOnlyBlockView, error)

NewReadOnlyBlockView constructs a new read-only block view

type Option 

type Option func(*Config) *Config

func WithBlockNumber 

func WithBlockNumber(blockNumber *big.Int) Option

WithBlockNumber sets the block height in the block context

func WithBlockTime 

func WithBlockTime(time uint64) Option

WithBlockTime sets the block time in the block context

func WithBlockTotalGasUsedSoFar added in v0.36.4 

func WithBlockTotalGasUsedSoFar(gasUsed uint64) Option

WithBlockTotalGasSoFar sets the total amount of gas used for this block so far

func WithBlockTxCountSoFar added in v0.36.4 

func WithBlockTxCountSoFar(txCount uint) Option

WithBlockTxCountSoFar sets the total number of transactions included in the current block so far

func WithChainID added in v0.33.30 

func WithChainID(chainID *big.Int) Option

WithChainID sets the evm chain ID

func WithCoinbase 

func WithCoinbase(coinbase gethCommon.Address) Option

WithCoinbase sets the coinbase of the block where the fees are collected in

func WithDirectCallBaseGasUsage 

func WithDirectCallBaseGasUsage(gas uint64) Option

WithDirectCallBaseGasUsage sets the base direct call gas usage

func WithExtraPrecompiledContracts added in v0.35.17 

func WithExtraPrecompiledContracts(precompiledContracts []types.PrecompiledContract) Option

WithExtraPrecompiledContracts appends the precompiled contract list with extra precompiled contracts

func WithGasLimit 

func WithGasLimit(gasLimit uint64) Option

WithGasLimit sets the gas limit of the transaction

func WithGasPrice 

func WithGasPrice(gasPrice *big.Int) Option

WithGasPrice sets the gas price for the transaction (usually the one sets by the sender)

func WithGetBlockHashFunction 

func WithGetBlockHashFunction(getHash gethVM.GetHashFunc) Option

WithGetBlockHashFunction sets the functionality to look up block hash by height

func WithOrigin 

func WithOrigin(origin gethCommon.Address) Option

WithOrigin sets the origin of the transaction (signer)

func WithRandom added in v0.33.30 

func WithRandom(rand *gethCommon.Hash) Option

WithRandom sets the block context random field

func WithTransactionTracer added in v0.33.30 

func WithTransactionTracer(tracer *tracers.Tracer) Option

WithTransactionTracer sets a transaction tracer

type ReadOnlyBlockView 

type ReadOnlyBlockView struct {
	// contains filtered or unexported fields
}

ReadOnlyBlockView provides a read only view of a block could be used for multiple queries against a block

func (*ReadOnlyBlockView) BalanceOf 

func (bv *ReadOnlyBlockView) BalanceOf(address types.Address) (*big.Int, error)

BalanceOf returns the balance of the given address

func (*ReadOnlyBlockView) CodeHashOf added in v0.33.30 

func (bv *ReadOnlyBlockView) CodeHashOf(address types.Address) ([]byte, error)

CodeHashOf returns the code hash of the given address

func (*ReadOnlyBlockView) CodeOf 

func (bv *ReadOnlyBlockView) CodeOf(address types.Address) (types.Code, error)

CodeOf returns the code of the given address

func (*ReadOnlyBlockView) NonceOf 

func (bv *ReadOnlyBlockView) NonceOf(address types.Address) (uint64, error)

NonceOf returns the nonce of the given address

type WrappedPrecompiledContract added in v0.36.3 

type WrappedPrecompiledContract struct {
	// contains filtered or unexported fields
}

func (*WrappedPrecompiledContract) Address added in v0.36.3 

func (wpc *WrappedPrecompiledContract) Address() types.Address

func (*WrappedPrecompiledContract) RequiredGas added in v0.36.3 

func (wpc *WrappedPrecompiledContract) RequiredGas(input []byte) uint64

func (*WrappedPrecompiledContract) Run added in v0.36.3 

func (wpc *WrappedPrecompiledContract) Run(input []byte) ([]byte, error)

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